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JurassicParkTrespasser/jp2_pc/Source/Lib/Renderer/Primitives/P5/DrawSubTriangleBumpEx.inl

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Initial commit
2018-01-01 22:07:24 +00:00
/***********************************************************************************************
*
* Copyright <20> DreamWorks Interactive, 1997.
*
* Contents:
* Specialized (non-template) versions of the DrawSubtriangle function.
* Optimized for the Pentium Processor
*
***********************************************************************************************
*
* $Log:: /JP2_PC/Source/Lib/Renderer/Primitives/P5/DrawSubTriangleBumpEx.cpp $
*
* 14 98.08.13 4:26p Mmouni
* Changes for VC++ 5.0sp3 compatibility.
*
* 13 98.01.22 3:15p Mmouni
* Added support for 16-bit deep bump-maps.
*
* 12 97.10.27 1:22p Mmouni
* Changed unreference locals (preventing internal compiler errors) to typedefs.
*
* 11 97.10.22 7:11p Mmouni
* Moved code that makes copies of edge values into assembly.
*
* 10 10/10/97 1:47p Mmouni
* All inner loops are now left to right only, and optimized some.
*
* 9 9/30/97 9:31p Mmouni
* All primitives now have optimized y loops.
*
* 8 9/29/97 11:55a Mmouni
* Made self modification conditional on direction.
*
* 7 9/15/97 2:10p Mmouni
* Optimized inner loops (not final yet).
*
* 6 9/01/97 8:02p Rwyatt
* ANDs added to enable tiling
*
* 5 97/07/18 3:28p Pkeet
* Removed use of the 'b_right' parameter from DrawSubTriangle.
*
* 4 97/07/16 15:49 Speter
* Commented out redundant static delcarations now that all DrawSubTriangles are included into
* one file (now just declared in DrawSubTriangleEx.cpp.)
*
* 3 7/14/97 12:36p Rwyatt
* Checkled in so Scott can move them....
*
* 2 7/11/97 2:52p Rwyatt
* Highly optimized Linear Non-transparent for P5
*
* 1 7/07/97 7:23p Rwyatt
* Initial Implementation of Pentium Specific bump mapping
*
***********************************************************************************************
***********************************************************************************************
*
* 8 6/15/97 2:40a Rwyatt
* Optimized perspective bump mapping to be in line with the non perspective.
*
* 7 6/15/97 1:31a Bbell
* Removed unnecessary include.
*
* 6 97/06/12 5:56p Pkeet
* Added capability to render only every other scanline and to double the number of scanlines.
*
* 5 6/12/97 3:15p Rwyatt
* Linear bump mapping optimized for PENTIUM PRO only, on this devices it is about 10 - 20%
* faster. On a pentium this code will be much (30%) slower due to lots of data dependencies and
* AGIs which the pro is immune to.
*
* 4 6/11/97 11:29p Rwyatt
* Optimized scan setup time and for both linear bump mappers.
*
* 3 6/11/97 7:08p Rwyatt
* Removed AGIs from UV walking in Transparent linear
*
* 2 97/06/10 11:15p Pkeet
* Added self-modifying code for the increment and the decrement.
*
* 1 97/06/10 2:27p Pkeet
* Moved the bumpmap routines here from DrawSubTriangle.
*
* 9 97/06/10 1:20p Pkeet
* Added initial assembly optimizations for bumpmap linear routines.
*
* 8 97/06/10 12:53p Pkeet
* Fixed bug in bumpmap assembly.
*
* 7 97/06/10 10:51a Pkeet
* Added initial assembly optimization passes for perspective corrected bumpmapping for both
* transparent and non-transparent versions.
*
* 6 97/06/09 6:38p Pkeet
* Algorithmic optimizations.
*
* 5 97/06/08 4:16p Pkeet
* Added perspective correction bump map primitives.
*
* 4 97/06/06 8:51p Pkeet
* Added linear.
*
* 3 97/06/06 6:44p Pkeet
* Moved the inner loop to self-modifying code.
*
* 2 97/06/06 4:36p Pkeet
* It works again.
*
* 1 97/06/04 6:46p Pkeet
* Initial specialized version of DrawSubTriangle.
*
**********************************************************************************************/
#include "Common.hpp"
#include "Lib/View/Raster.hpp"
#include "Lib/Renderer/Primitives/DrawTriangle.hpp"
#if (iBUMPMAP_RESOLUTION == 16)
//*****************************************************************************************
//
// Bumpmapped, Perspective correct and transparent for 16 bit screen.
//
void DrawSubtriangle(TBumpPerspTrans* pscan, CDrawPolygon<TBumpPerspTrans>* pdtri)
{
typedef TBumpPerspTrans::TIndex prevent_internal_compiler_errors;
static void* pvLastClut = 0;
static void* pvLastTexture = 0;
static void* pvLastBumpToIntensity = 0;
TBumpPerspTrans* plinc = &pdtri->pedgeBase->lineIncrement;
__asm
{
//
// Do self-modifications here.
//
mov eax,[pvTextureBitmap] // Texuremap pointer.
mov ebx,[pvClutConversion] // Clut conversion pointer.
mov edx,[au1SubBumpToIntensity] // Pointer to the angle to intensity lookup table.
mov ecx,[pvLastTexture]
mov esi,[pvLastClut]
mov edi,[pvLastBumpToIntensity]
cmp eax,ecx
jne short DO_MODIFY
cmp ebx,esi
jne short DO_MODIFY
cmp edx,edi
je short DONE_WITH_MODIFY
DO_MODIFY:
mov [pvLastTexture],eax
mov [pvLastClut],ebx
mov [pvLastBumpToIntensity],edx
lea ecx,[eax+1] // Texture pointer plus one.
lea esi,[ebx+1] // Clut pointer plus one.
lea edi,MODIFY_FOR_TEXTUREPOINTER_A
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_A
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_A
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_A
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_A
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_B
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_B
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_B
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_B
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_B
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_C
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_C
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_C
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_C
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_C
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_D
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_D
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_D
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_D
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_D
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_E
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_E
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_E
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_E
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_E
mov [edi-4],esi
DONE_WITH_MODIFY:
//
// Local copies of edge stepping values.
//
// fx_inc = pdtri->pedgeBase->lineIncrement.fxX;
// fx_diff = pdtri->pedgeBase->lineIncrement.fxXDifference;
// f_inc_uinvz = pdtri->pedgeBase->lineIncrement.indCoord.fUInvZ;
// f_inc_vinvz = pdtri->pedgeBase->lineIncrement.indCoord.fVInvZ;
// f_inc_invz = pdtri->pedgeBase->lineIncrement.indCoord.fInvZ;
//
mov eax,[plinc]
mov esi,[pdtri] // Pointer to polygon object.
mov ecx,[pscan] // Pointer to scanline object.
mov ebx,[eax]TBumpPerspTrans.fxX
mov edx,[eax]TBumpPerspTrans.fxXDifference
mov fx_inc,ebx
mov fx_diff,edx
mov ebx,[eax]TBumpPerspTrans.indCoord.fUInvZ
mov edx,[eax]TBumpPerspTrans.indCoord.fVInvZ
mov f_inc_uinvz,ebx
mov ebx,[eax]TBumpPerspTrans.indCoord.fInvZ
mov f_inc_vinvz,edx
mov f_inc_invz,ebx
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
push ebp // Save ebp.
// Check to see if we sould skip this scanline.
mov eax,[esi]CDrawPolygonBase.iY
mov ebx,[bEvenScanlinesOnly]
and eax,ebx
jnz short END_OF_SCANLINE
// Setup for prespective correction and looping.
PERSPECTIVE_SCANLINE_PROLOGUE(TBumpPerspTrans)
//
// eax = i_pixel
// edi = inner loop count
// ecx,edx,esi = texture values
//
mov ebp,gsGlobals.pvScreen // Pointer the screen.
mov ebx,[i_screen_index] // Load scanline offset.
add ebx,eax // Add scanline offset to i_pixel
mov [i_pixel],eax // Save i_pixel.
mov eax,[u4TextureTileMask] // Load tiling mask.
and edx,eax // Mask for tiling.
lea ebp,[ebp+ebx*2] // Base of span in ebp.
mov [pvBaseOfLine],ebp // Keep pointer to base of span.
lea eax,[ebp+edi*2]
// Check alignement.
test eax,3
jz short ALIGNED
//
// Do one pixel for alignment.
//
mov al,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_A:
mov ebp,[u4LightTheta] // Load light theta.
test al,0xfc // Test for transparent.
jz short SKIP_ALIGN_PIXEL
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_A:
mov bh,al // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_A:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
add esi,ebx // Step the U fraction.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_A:
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_A:
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],cx // Write to frame buffer.
inc edi
jz short DONE_WITH_SPAN
jmp short ALIGNED
SKIP_ALIGN_PIXEL:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
// AGI
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
and edx,ebx // Mask for tiling.
inc edi
jz short DONE_WITH_SPAN
ALIGNED:
// Make sure we have two pixels left.
add edi,2
jg short FINISH_REMAINDER
INNER_LOOP_2P:
mov al,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_B:
mov ebp,[u4LightTheta] // Load light theta.
test al,0xfc // Test for transparent.
jz short SKIP_FIRST_PIXEL
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_B:
mov bh,al // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_B:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_B:
and edx,ebx // Mask for tiling.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_B:
// AGI on ecx
mov al,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_C:
mov ebp,[u4LightTheta] // Load light theta.
test al,0xfc // Test for transparent.
jz short SKIP_SECOND_PIXEL
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_C:
mov bh,al // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
nop
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_C:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
add esi,ebx // Step the U fraction.
mov ebx,ecx // Copy pixel values.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[u4TextureTileMask] // Load tiling mask.
shl ebx,16 // Shift first pixel up.
and edx,ebp // Mask for tiling.
mov bh,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_C:
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov bl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_C:
add edi,2 // Step count.
bswap ebx // Swap pixels into place.
mov [ebp + edi*2 - 8],ebx // Write to frame buffer.
jle short INNER_LOOP_2P
jmp FINISH_REMAINDER
//
// Skippped over the first pixel.
//
SKIP_FIRST_PIXEL:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
// AGI on ebp
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
and edx,ebx // Mask for tiling.
// AGI on edx
mov al,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_D:
mov ebp,[u4LightTheta] // Load light theta.
test al,0xfc // Test for transparent.
jz short SKIP_BOTH_PIXELS
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_D:
mov bh,al // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_D:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
add esi,ebx // Step the U fraction.
mov ebx,ecx // Copy pixel values.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[u4TextureTileMask] // Load tiling mask.
shl ebx,16 // Shift first pixel up.
and edx,ebp // Mask for tiling.
mov bl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_D:
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov bh,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_D:
mov [ebp + edi*2 - 2],bx // Store second pixel.
add edi,2 // Step count.
jle short INNER_LOOP_2P
jmp FINISH_REMAINDER
//
// Skippped over the second pixel, fist pixel is non-transparent.
//
SKIP_SECOND_PIXEL:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add ecx,ebp // Step the V fraction.
mov al,ch // Copy first pixel.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
mov ah,cl // Copy first pixel.
nop
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
and edx,ebx // Mask for tiling.
mov [ebp + edi*2 - 4],ax // Store first pixel.
add edi,2 // Step count.
jle short INNER_LOOP_2P
jmp FINISH_REMAINDER
//
// Skippped over the both pixels.
//
SKIP_BOTH_PIXELS:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
// AGI
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
and edx,ebx // Mask for tiling.
add edi,2 // Step count.
jle short INNER_LOOP_2P
//
// Finish left over pixel (if any)
//
FINISH_REMAINDER:
// edi is 1 if there is a pixel left.
cmp edi,1
jne short DONE_WITH_SPAN
//
// One pixel, update texture values.
//
mov al,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_E:
mov ebp,[u4LightTheta] // Load light theta.
test al,0xfc // Test for transparent.
jz short SKIP_LEFTOVER_PIXEL
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_E:
mov bh,al // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_E:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
add esi,ebx // Step the U fraction.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_E:
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_E:
and edx,ebx // Mask for tiling.
mov [ebp - 2],cx // Write to frame buffer.
jmp short DONE_WITH_SPAN
SKIP_LEFTOVER_PIXEL:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
// AGI
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
and edx,ebx // Mask for tiling.
DONE_WITH_SPAN:
// See if there are any pixels left.
cmp [i_pixel],0
jz END_OF_SCANLINE
// Do perspective correction and looping.
PERSPECTIVE_SCANLINE_EPILOGUE
END_OF_SCANLINE:
pop ebp
//
// Increment the base edge.
//
mov esi,[pdtri] // Pointer to polygon object.
mov ecx,[pscan] // Pointer to scanline object.
// Step length, line starting address.
mov eax,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov ebx,[esi]CDrawPolygonBase.iLineStartIndex
add eax,[esi]CDrawPolygonBase.fxDeltaLineLength.i4Fx
add ebx,[gsGlobals.u4LinePixels]
mov [esi]CDrawPolygonBase.fxLineLength.i4Fx,eax
mov [esi]CDrawPolygonBase.iLineStartIndex,ebx
// Step edge values.
mov eax,[ecx]TBumpPerspTrans.fxX.i4Fx
mov ebx,[ecx]TBumpPerspTrans.fxXDifference.i4Fx
fld [ecx]TBumpPerspTrans.indCoord.fUInvZ
fadd [f_inc_uinvz]
fld [ecx]TBumpPerspTrans.indCoord.fVInvZ
fadd [f_inc_vinvz]
fld [ecx]TBumpPerspTrans.indCoord.fInvZ
fadd [f_inc_invz]
add eax,[fx_inc]
add ebx,[fx_diff]
jge short NO_UNDERFLOW
// Underflow.
add ebx,0x00010000
jmp short BORROW_OR_CARRY
NO_UNDERFLOW:
cmp ebx,0x00010000
jle short NO_OVERFLOW
// Overflow.
sub ebx,0x00010000
jmp short BORROW_OR_CARRY
NO_OVERFLOW:
fstp [ecx]TBumpPerspTrans.indCoord.fInvZ
fstp [ecx]TBumpPerspTrans.indCoord.fVInvZ
fstp [ecx]TBumpPerspTrans.indCoord.fUInvZ
jmp short FINISH_LOOPING
BORROW_OR_CARRY:
fadd [fNegInvZ] // Z V U
fxch st(1) // V Z U
fadd [fNegVInvZ] // V Z U
fxch st(2) // U Z V
fadd [fNegUInvZ] // U Z V
fxch st(1) // Z U V
fstp [ecx]TBumpPerspTrans.indCoord.fInvZ
fstp [ecx]TBumpPerspTrans.indCoord.fUInvZ
fstp [ecx]TBumpPerspTrans.indCoord.fVInvZ
FINISH_LOOPING:
// Y Loop control.
mov [ecx]TBumpPerspTrans.fxX.i4Fx,eax
mov edx,[esi]CDrawPolygonBase.iY
mov [ecx]TBumpPerspTrans.fxXDifference.i4Fx,ebx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
}
}
//*****************************************************************************************
//
// Bumpmapped and Perspective correct for 16 bit screen.
//
void DrawSubtriangle(TBumpPersp* pscan, CDrawPolygon<TBumpPersp>* pdtri)
{
typedef TBumpPersp::TIndex prevent_internal_compiler_errors;
static void* pvLastClut = 0;
static void* pvLastTexture = 0;
static void* pvLastBumpToIntensity = 0;
TBumpPersp* plinc = &pdtri->pedgeBase->lineIncrement;
__asm
{
//
// Do self-modifications here.
//
mov eax,[pvTextureBitmap] // Texuremap pointer.
mov ebx,[pvClutConversion] // Clut conversion pointer.
mov edx,[au1SubBumpToIntensity] // Pointer to the angle to intensity lookup table.
mov ecx,[pvLastTexture]
mov esi,[pvLastClut]
mov edi,[pvLastBumpToIntensity]
cmp eax,ecx
jne short DO_MODIFY
cmp ebx,esi
jne short DO_MODIFY
cmp edx,edi
je short DONE_WITH_MODIFY
DO_MODIFY:
mov [pvLastTexture],eax
mov [pvLastClut],ebx
mov [pvLastBumpToIntensity],edx
lea ecx,[eax+1] // Texture pointer plus one.
lea esi,[ebx+1] // Clut pointer plus one.
lea edi,MODIFY_FOR_TEXTUREPOINTER_A
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_A
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_A
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_A
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_A
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_B
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_B
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_B
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_B
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_B
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_C
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_C
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_C
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_C
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_C
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_D
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_D
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_D
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_D
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_D
mov [edi-4],esi
DONE_WITH_MODIFY:
//
// Local copies of edge stepping values.
//
// fx_inc = pdtri->pedgeBase->lineIncrement.fxX;
// fx_diff = pdtri->pedgeBase->lineIncrement.fxXDifference;
// f_inc_uinvz = pdtri->pedgeBase->lineIncrement.indCoord.fUInvZ;
// f_inc_vinvz = pdtri->pedgeBase->lineIncrement.indCoord.fVInvZ;
// f_inc_invz = pdtri->pedgeBase->lineIncrement.indCoord.fInvZ;
//
mov eax,[plinc]
mov esi,[pdtri] // Pointer to polygon object.
mov ecx,[pscan] // Pointer to scanline object.
mov ebx,[eax]TBumpPersp.fxX
mov edx,[eax]TBumpPersp.fxXDifference
mov fx_inc,ebx
mov fx_diff,edx
mov ebx,[eax]TBumpPersp.indCoord.fUInvZ
mov edx,[eax]TBumpPersp.indCoord.fVInvZ
mov f_inc_uinvz,ebx
mov ebx,[eax]TBumpPersp.indCoord.fInvZ
mov f_inc_vinvz,edx
mov f_inc_invz,ebx
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
push ebp // Save ebp.
// Check to see if we sould skip this scanline.
mov eax,[esi]CDrawPolygonBase.iY
mov ebx,[bEvenScanlinesOnly]
and eax,ebx
jnz short END_OF_SCANLINE
// Setup for prespective correction and looping.
PERSPECTIVE_SCANLINE_PROLOGUE(TBumpPersp)
//
// eax = i_pixel
// edi = inner loop count
// ecx,edx,esi = texture values
//
mov ebp,gsGlobals.pvScreen // Pointer the screen.
mov ebx,[i_screen_index] // Load scanline offset.
add ebx,eax // Add scanline offset to i_pixel
mov [i_pixel],eax // Save i_pixel.
mov eax,[u4TextureTileMask] // Load tiling mask.
and edx,eax // Mask for tiling.
lea ebp,[ebp+ebx*2] // Base of span in ebp.
mov [pvBaseOfLine],ebp // Keep pointer to base of span.
lea eax,[ebp+edi*2]
// Check alignement.
test eax,3
jz short ALIGNED
//
// Do one pixel for alignment.
//
mov bh,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_A:
mov ebp,[u4LightTheta] // Load light theta.
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_A:
mov al,bh // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_A:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
add esi,ebx // Step the U fraction.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_A:
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_A:
and edx,ebx // Mask for tiling.
mov [ebp + edi*2],cx // Write to frame buffer.
inc edi
jz short DONE_WITH_SPAN
ALIGNED:
// Make sure we have two pixels left.
add edi,2
jg short FINISH_REMAINDER
//
// Do two pixels at a time.
//
INNER_LOOP_2P:
mov bh,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_B:
mov ebp,[u4LightTheta] // Load light theta.
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_B:
mov al,bh // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_B:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_B:
and edx,ebx // Mask for tiling.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_B:
// AGI on edx
mov bh,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_C:
mov ebp,[u4LightTheta] // Load light theta.
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_C:
mov al,bh // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
nop
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_C:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
add esi,ebx // Step the U fraction.
mov ebx,ecx // Copy pixel values.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[u4TextureTileMask] // Load tiling mask.
shl ebx,16 // Shift first pixel up.
and edx,ebp // Mask for tiling.
mov bh,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_C:
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov bl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_C:
add edi,2 // Step count.
bswap ebx // Swap pixels into place.
mov [ebp + edi*2 - 8],ebx // Write to frame buffer.
jle short INNER_LOOP_2P
//
// Finish left over pixel (if any)
//
FINISH_REMAINDER:
// edi is 1 if there is a pixel left.
cmp edi,1
jne short DONE_WITH_SPAN
//
// One pixel, update texture values.
//
mov bh,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_D:
mov ebp,[u4LightTheta] // Load light theta.
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_D:
mov al,bh // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_D:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
add esi,ebx // Step the U fraction.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_D:
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_D:
and edx,ebx // Mask for tiling.
mov [ebp - 2],cx // Write to frame buffer.
DONE_WITH_SPAN:
// See if there are any pixels left.
cmp [i_pixel],0
jz END_OF_SCANLINE
// Do perspective correction and looping.
PERSPECTIVE_SCANLINE_EPILOGUE
END_OF_SCANLINE:
pop ebp
//
// Increment the base edge.
//
mov esi,[pdtri] // Pointer to polygon object.
mov ecx,[pscan] // Pointer to scanline object.
// Step length, line starting address.
mov eax,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov ebx,[esi]CDrawPolygonBase.iLineStartIndex
add eax,[esi]CDrawPolygonBase.fxDeltaLineLength.i4Fx
add ebx,[gsGlobals.u4LinePixels]
mov [esi]CDrawPolygonBase.fxLineLength.i4Fx,eax
mov [esi]CDrawPolygonBase.iLineStartIndex,ebx
// Step edge values.
mov eax,[ecx]TBumpPersp.fxX.i4Fx
mov ebx,[ecx]TBumpPersp.fxXDifference.i4Fx
fld [ecx]TBumpPersp.indCoord.fUInvZ
fadd [f_inc_uinvz]
fld [ecx]TBumpPersp.indCoord.fVInvZ
fadd [f_inc_vinvz]
fld [ecx]TBumpPersp.indCoord.fInvZ
fadd [f_inc_invz]
add eax,[fx_inc]
add ebx,[fx_diff]
jge short NO_UNDERFLOW
// Underflow.
add ebx,0x00010000
jmp short BORROW_OR_CARRY
NO_UNDERFLOW:
cmp ebx,0x00010000
jle short NO_OVERFLOW
// Overflow.
sub ebx,0x00010000
jmp short BORROW_OR_CARRY
NO_OVERFLOW:
fstp [ecx]TBumpPersp.indCoord.fInvZ
fstp [ecx]TBumpPersp.indCoord.fVInvZ
fstp [ecx]TBumpPersp.indCoord.fUInvZ
jmp short FINISH_LOOPING
BORROW_OR_CARRY:
fadd [fNegInvZ] // Z V U
fxch st(1) // V Z U
fadd [fNegVInvZ] // V Z U
fxch st(2) // U Z V
fadd [fNegUInvZ] // U Z V
fxch st(1) // Z U V
fstp [ecx]TBumpPersp.indCoord.fInvZ
fstp [ecx]TBumpPersp.indCoord.fUInvZ
fstp [ecx]TBumpPersp.indCoord.fVInvZ
FINISH_LOOPING:
// Y Loop control.
mov [ecx]TBumpPersp.fxX.i4Fx,eax
mov edx,[esi]CDrawPolygonBase.iY
mov [ecx]TBumpPersp.fxXDifference.i4Fx,ebx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
}
}
//*****************************************************************************************
//
// Bumpmapped, Linear and transparent for 16 bit screen.
//
void DrawSubtriangle(TBumpLinearTrans* pscan, CDrawPolygon<TBumpLinearTrans>* pdtri)
{
typedef TBumpLinearTrans::TIndex prevent_internal_compiler_errors;
static void* pvLastClut = 0;
static void* pvLastTexture = 0;
static void* pvLastBumpToIntensity = 0;
static CDrawPolygon<TBumpLinearTrans>* pdtriGlbl;
static TBumpLinearTrans* pscanGlbl;
TBumpLinearTrans* plinc = &pdtri->pedgeBase->lineIncrement;
__asm
{
//
// Do self-modifications here.
//
mov eax,[pvTextureBitmap] // Texuremap pointer.
mov ebx,[pvClutConversion] // Clut conversion pointer.
mov edx,[au1SubBumpToIntensity] // Pointer to the angle to intensity lookup table.
mov ecx,[pvLastTexture]
mov esi,[pvLastClut]
mov edi,[pvLastBumpToIntensity]
cmp eax,ecx
jne short DO_MODIFY
cmp ebx,esi
jne short DO_MODIFY
cmp edx,edi
je short DONE_WITH_MODIFY
DO_MODIFY:
mov [pvLastTexture],eax
mov [pvLastClut],ebx
mov [pvLastBumpToIntensity],edx
lea ecx,[eax+1] // Texture pointer plus one.
lea esi,[ebx+1] // Clut pointer plus one.
lea edi,MODIFY_FOR_TEXTUREPOINTER_A
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_A
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_A
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_A
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_A
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_B
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_B
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_B
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_B
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_B
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_C
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_C
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_C
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_C
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_C
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_D
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_D
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_D
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_D
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_D
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_E
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_E
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_E
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_E
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_E
mov [edi-4],esi
DONE_WITH_MODIFY:
push ebp // Save ebp.
mov edi,[plinc] // Pointer to scanline increment.
mov eax,[pscan] // Pointer to scanline.
mov esi,[pdtri] // Pointer to polygon.
//
// Copies of edge stepping values.
//
// fx_inc = pdtri->pedgeBase->lineIncrement.fxX;
// fx_diff = pdtri->pedgeBase->lineIncrement.fxXDifference;
// bf_u_inc = pdtri->pedgeBase->lineIncrement.indCoord.bfU;
// w1d_v_inc = pdtri->pedgeBase->lineIncrement.indCoord.w1dV;
// pscanCopy = pscan;
// pdtriCopy = pdtri;
//
mov ebx,[edi]TBumpLinearTrans.fxX
mov ecx,[edi]TBumpLinearTrans.fxXDifference
mov fx_inc,ebx
mov fx_diff,ecx
mov ebx,[edi]TBumpLinearTrans.indCoord.bfU.i4Int
mov ecx,[edi]TBumpLinearTrans.indCoord.bfU.u4Frac
mov bf_u_inc.i4Int,ebx
mov bf_u_inc.u4Frac,ecx
mov ebx,[edi]TBumpLinearTrans.indCoord.w1dV.bfxValue.i4Int
mov ecx,[edi]TBumpLinearTrans.indCoord.w1dV.bfxValue.u4Frac
mov w1d_v_inc.bfxValue.i4Int,ebx
mov w1d_v_inc.bfxValue.u4Frac,ecx
mov pdtriGlbl,esi
mov pscanGlbl,eax
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
// Check to see if we should skip this scanline.
mov ecx,[esi]CDrawPolygonBase.iY
mov ebx,[bEvenScanlinesOnly]
and ecx,ebx
jnz END_OF_SCANLINE
// Determine the start and end of the scanline.
mov ebx,[eax]TBumpLinearTrans.fxX.i4Fx
mov ecx,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov edx,[esi]CDrawPolygonBase.iLineStartIndex
add ebx,ecx
sar ebx,16
mov edi,[eax]TBumpLinearTrans.fxX.i4Fx
sar edi,16
add edx,ebx
sub edi,ebx // i_pixel
jge END_OF_SCANLINE
//
// edi = i_pixel
// edx = i_screen_index
// ecx = pointer to scanline
//
mov ebp,gsGlobals.pvScreen // Pointer the screen.
mov ebx,[eax]TBumpLinearTrans.indCoord.bfU.i4Int // Uint
mov esi,[eax]TBumpLinearTrans.indCoord.bfU.u4Frac // Ufrac
lea ebp,[ebp+edx*2] // Base of scanline.
mov edx,[eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.i4Int // Vint
add edx,ebx // Add Uint to Vint
mov ecx,[eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.u4Frac // Vfrac
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov [pvBaseOfLine],ebp // Save pointer to base of line.
and edx,ebx // Mask for tiling.
lea eax,[ebp+edi*2]
// Check alignement.
test eax,3
jz short ALIGNED
//
// Do one pixel for alignment.
//
mov al,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_A:
mov ebp,[u4LightTheta] // Load light theta.
test al,0xfc // Test for transparent.
jz short SKIP_ALIGN_PIXEL
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_A:
mov bh,al // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_A:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
add esi,ebx // Step the U fraction.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_A:
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_A:
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],cx // Write to frame buffer.
inc edi
jz short END_OF_SCANLINE
jmp short ALIGNED
SKIP_ALIGN_PIXEL:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
// AGI
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
and edx,ebx // Mask for tiling.
inc edi
jz short END_OF_SCANLINE
ALIGNED:
// Make sure we have two pixels left.
add edi,2
jg short FINISH_REMAINDER
INNER_LOOP_2P:
mov al,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_B:
mov ebp,[u4LightTheta] // Load light theta.
test al,0xfc // Test for transparent.
jz short SKIP_FIRST_PIXEL
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_B:
mov bh,al // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_B:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_B:
and edx,ebx // Mask for tiling.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_B:
// AGI on ecx
mov al,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_C:
mov ebp,[u4LightTheta] // Load light theta.
test al,0xfc // Test for transparent.
jz short SKIP_SECOND_PIXEL
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_C:
mov bh,al // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
nop
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_C:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
add esi,ebx // Step the U fraction.
mov ebx,ecx // Copy pixel values.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[u4TextureTileMask] // Load tiling mask.
shl ebx,16 // Shift first pixel up.
and edx,ebp // Mask for tiling.
mov bh,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_C:
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov bl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_C:
add edi,2 // Step count.
bswap ebx // Swap pixels into place.
mov [ebp + edi*2 - 8],ebx // Write to frame buffer.
jle short INNER_LOOP_2P
jmp FINISH_REMAINDER
//
// Skippped over the first pixel.
//
SKIP_FIRST_PIXEL:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
// AGI on ebp
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
and edx,ebx // Mask for tiling.
// AGI on edx
mov al,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_D:
mov ebp,[u4LightTheta] // Load light theta.
test al,0xfc // Test for transparent.
jz short SKIP_BOTH_PIXELS
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_D:
mov bh,al // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_D:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
add esi,ebx // Step the U fraction.
mov ebx,ecx // Copy pixel values.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[u4TextureTileMask] // Load tiling mask.
shl ebx,16 // Shift first pixel up.
and edx,ebp // Mask for tiling.
mov bl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_D:
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov bh,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_D:
mov [ebp + edi*2 - 2],bx // Store second pixel.
add edi,2 // Step count.
jle short INNER_LOOP_2P
jmp FINISH_REMAINDER
//
// Skippped over the second pixel, fist pixel is non-transparent.
//
SKIP_SECOND_PIXEL:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add ecx,ebp // Step the V fraction.
mov al,ch // Copy first pixel.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
mov ah,cl // Copy first pixel.
nop
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
and edx,ebx // Mask for tiling.
mov [ebp + edi*2 - 4],ax // Store first pixel.
add edi,2 // Step count.
jle short INNER_LOOP_2P
jmp FINISH_REMAINDER
//
// Skippped over the both pixels.
//
SKIP_BOTH_PIXELS:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
// AGI
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
and edx,ebx // Mask for tiling.
add edi,2 // Step count.
jle short INNER_LOOP_2P
//
// Finish left over pixel (if any)
//
FINISH_REMAINDER:
// edi is 1 if there is a pixel left.
cmp edi,1
jne short END_OF_SCANLINE
//
// One pixel, update texture values.
//
mov al,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_E:
mov ebp,[u4LightTheta] // Load light theta.
test al,0xfc // Test for transparent.
jz short END_OF_SCANLINE
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_E:
mov bh,al // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_E:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
add esi,ebx // Step the U fraction.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_E:
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_E:
and edx,ebx // Mask for tiling.
mov [ebp - 2],cx // Write to frame buffer.
END_OF_SCANLINE:
mov eax,[pscanGlbl]
mov ebp,bf_u_inc.i4Int
// AGI on eax.
mov ecx,[eax]TBumpLinearTrans.indCoord.bfU.u4Frac
mov edx,[eax]TBumpLinearTrans.indCoord.bfU.i4Int
mov edi,[eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.i4Int
mov esi,[eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.u4Frac
add edi,w1d_v_inc.bfxValue.i4Int
add ecx,bf_u_inc.u4Frac
adc edx,ebp
mov ebp,w1d_v_inc.bfxValue.u4Frac
add esi,ebp
jnc short NO_VFRAC_CARRY
add edi,[eax]TBumpLinearTrans.indCoord.w1dV.iOffsetPerLine
NO_VFRAC_CARRY:
mov ebx,[eax]TBumpLinearTrans.fxXDifference
mov ebp,[fx_diff]
add ebx,ebp
jge short NO_UNDERFLOW
// Undeflow of fxXDifference.
add ebx,0x00010000
mov ebp,bfNegDU.i4Int
add edi,w1dNegDV.bfxValue.i4Int
add ecx,bfNegDU.u4Frac
adc edx,ebp
mov ebp,w1dNegDV.bfxValue.u4Frac
add esi,ebp
jnc short EDGE_DONE
add edi,[eax]TBumpLinearTrans.indCoord.w1dV.iOffsetPerLine
jmp short EDGE_DONE
NO_UNDERFLOW:
cmp ebx,0x00010000
jl short EDGE_DONE
// Overflow of fxXDifference.
sub ebx,0x00010000
mov ebp,bfNegDU.i4Int
add edi,w1dNegDV.bfxValue.i4Int
add ecx,bfNegDU.u4Frac
adc edx,ebp
mov ebp,w1dNegDV.bfxValue.u4Frac
add esi,ebp
jnc short EDGE_DONE
add edi,[eax]TBumpLinearTrans.indCoord.w1dV.iOffsetPerLine
EDGE_DONE:
// Store modified variables and do looping.
mov [eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.u4Frac,esi
mov [eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.i4Int,edi
mov [eax]TBumpLinearTrans.fxXDifference,ebx
mov esi,[pdtriGlbl] // Pointer to polygon object.
mov [eax]TBumpLinearTrans.indCoord.bfU.u4Frac,ecx
mov [eax]TBumpLinearTrans.indCoord.bfU.i4Int,edx
// Step length, line starting address.
mov ebx,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov ecx,[esi]CDrawPolygonBase.iLineStartIndex
add ebx,[esi]CDrawPolygonBase.fxDeltaLineLength.i4Fx
add ecx,[gsGlobals.u4LinePixels]
mov [esi]CDrawPolygonBase.fxLineLength.i4Fx,ebx
mov [esi]CDrawPolygonBase.iLineStartIndex,ecx
mov ecx,[eax]TBumpLinearTrans.fxX
mov ebp,[fx_inc]
add ecx,ebp
mov edx,[esi]CDrawPolygonBase.iY
mov [eax]TBumpLinearTrans.fxX,ecx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
pop ebp // Restore the base pointer.
}
}
//*****************************************************************************************
//
// Bumpmapped and Linear for 16 bit screen.
//
void DrawSubtriangle(TBumpLinear* pscan, CDrawPolygon<TBumpLinear>* pdtri)
{
typedef TBumpLinear::TIndex prevent_internal_compiler_errors;
static void* pvLastClut = 0;
static void* pvLastTexture = 0;
static void* pvLastBumpToIntensity = 0;
static CDrawPolygon<TBumpLinear>* pdtriGlbl;
static TBumpLinear* pscanGlbl;
TBumpLinear* plinc = &pdtri->pedgeBase->lineIncrement;
__asm
{
//
// Do self-modifications here.
//
mov eax,[pvTextureBitmap] // Texuremap pointer.
mov ebx,[pvClutConversion] // Clut conversion pointer.
mov edx,[au1SubBumpToIntensity] // Pointer to the angle to intensity lookup table.
mov ecx,[pvLastTexture]
mov esi,[pvLastClut]
mov edi,[pvLastBumpToIntensity]
cmp eax,ecx
jne short DO_MODIFY
cmp ebx,esi
jne short DO_MODIFY
cmp edx,edi
je short DONE_WITH_MODIFY
DO_MODIFY:
mov [pvLastTexture],eax
mov [pvLastClut],ebx
mov [pvLastBumpToIntensity],edx
lea ecx,[eax+1] // Texture pointer plus one.
lea esi,[ebx+1] // Clut pointer plus one.
lea edi,MODIFY_FOR_TEXTUREPOINTER_A
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_A
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_A
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_A
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_A
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_B
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_B
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_B
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_B
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_B
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_C
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_C
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_C
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_C
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_C
mov [edi-4],esi
lea edi,MODIFY_FOR_TEXTUREPOINTER_D
mov [edi-4],eax
lea edi,MODIFY_FOR_TEXTUREPOINTER_PL1_D
mov [edi-4],ecx
lea edi,MODIFY_FOR_ANGLETOINTENSITY_D
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION_D
mov [edi-4],ebx
lea edi,MODIFY_FOR_CLUT_CONVERSION_PL1_D
mov [edi-4],esi
DONE_WITH_MODIFY:
push ebp // Save ebp.
mov edi,[plinc] // Pointer to scanline increment.
mov eax,[pscan] // Pointer to scanline.
mov esi,[pdtri] // Pointer to polygon.
//
// Copies of edge stepping values.
//
// fx_inc = pdtri->pedgeBase->lineIncrement.fxX;
// fx_diff = pdtri->pedgeBase->lineIncrement.fxXDifference;
// bf_u_inc = pdtri->pedgeBase->lineIncrement.indCoord.bfU;
// w1d_v_inc = pdtri->pedgeBase->lineIncrement.indCoord.w1dV;
// pscanCopy = pscan;
// pdtriCopy = pdtri;
//
mov ebx,[edi]TBumpLinear.fxX
mov ecx,[edi]TBumpLinear.fxXDifference
mov fx_inc,ebx
mov fx_diff,ecx
mov ebx,[edi]TBumpLinear.indCoord.bfU.i4Int
mov ecx,[edi]TBumpLinear.indCoord.bfU.u4Frac
mov bf_u_inc.i4Int,ebx
mov bf_u_inc.u4Frac,ecx
mov ebx,[edi]TBumpLinear.indCoord.w1dV.bfxValue.i4Int
mov ecx,[edi]TBumpLinear.indCoord.w1dV.bfxValue.u4Frac
mov w1d_v_inc.bfxValue.i4Int,ebx
mov w1d_v_inc.bfxValue.u4Frac,ecx
mov pdtriGlbl,esi
mov pscanGlbl,eax
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
// Check to see if we should skip this scanline.
mov ecx,[esi]CDrawPolygonBase.iY
mov ebx,[bEvenScanlinesOnly]
and ecx,ebx
jnz END_OF_SCANLINE
// Determine the start and end of the scanline.
mov ebx,[eax]TBumpLinear.fxX.i4Fx
mov ecx,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov edx,[esi]CDrawPolygonBase.iLineStartIndex
add ebx,ecx
sar ebx,16
mov edi,[eax]TBumpLinear.fxX.i4Fx
sar edi,16
add edx,ebx
sub edi,ebx // i_pixel
jge END_OF_SCANLINE
//
// edi = i_pixel
// edx = i_screen_index
// ecx = pointer to scanline
//
mov ebp,gsGlobals.pvScreen // Pointer the screen.
mov ebx,[eax]TBumpLinear.indCoord.bfU.i4Int // Uint
mov esi,[eax]TBumpLinear.indCoord.bfU.u4Frac // Ufrac
lea ebp,[ebp+edx*2] // Base of scanline.
mov edx,[eax]TBumpLinear.indCoord.w1dV.bfxValue.i4Int // Vint
add edx,ebx // Add Uint to Vint
mov ecx,[eax]TBumpLinear.indCoord.w1dV.bfxValue.u4Frac // Vfrac
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov [pvBaseOfLine],ebp // Save pointer to base of line.
and edx,ebx // Mask for tiling.
lea eax,[ebp+edi*2]
// Check alignement.
test eax,3
jz short ALIGNED
// Step to see if this is the only pixel.
inc edi
jz short FINISH_REMAINDER
//
// Do one pixel for alignment.
//
mov bh,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_A:
mov ebp,[u4LightTheta] // Load light theta.
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_A:
mov al,bh // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_A:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
add esi,ebx // Step the U fraction.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_A:
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_A:
and edx,ebx // Mask for tiling.
mov [ebp + edi*2 - 2],cx // Write to frame buffer.
ALIGNED:
// Make sure we have two pixels left.
add edi,2
jg short FINISH_REMAINDER
//
// Do two pixels at a time.
//
INNER_LOOP_2P:
mov bh,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_B:
mov ebp,[u4LightTheta] // Load light theta.
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_B:
mov al,bh // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
and eax,0x0000ffff // Clear upper part of eax.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_B:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add integer step plus u carry.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_B:
and edx,ebx // Mask for tiling.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_B:
// AGI on edx
mov bh,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_C:
mov ebp,[u4LightTheta] // Load light theta.
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_C:
mov al,bh // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
nop
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_C:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
shr eax,2 // Shift off extra bits.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Lookup integer step based on v carry.
add esi,ebx // Step the U fraction.
mov ebx,ecx // Copy pixel values.
adc edx,ebp // Add integer step plus u carry.
mov ebp,[u4TextureTileMask] // Load tiling mask.
shl ebx,16 // Shift first pixel up.
and edx,ebp // Mask for tiling.
mov bh,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_C:
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov bl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_C:
add edi,2 // Step count.
bswap ebx // Swap pixels into place.
mov [ebp + edi*2 - 8],ebx // Write to frame buffer.
jle short INNER_LOOP_2P
// edi is 1 if there is a pixel left.
cmp edi,1
jne short END_OF_SCANLINE
FINISH_REMAINDER:
//
// One pixel, don't update texture values.
//
mov bh,[edx*2 + 0xDEADBEEF] // Read texture value (high).
MODIFY_FOR_TEXTUREPOINTER_PL1_D:
mov ebp,[u4LightTheta] // Load light theta.
mov bl,[edx*2 + 0xDEADBEEF] // Read texture value (low).
MODIFY_FOR_TEXTUREPOINTER_D:
mov al,bh // Copy texture value (high).
sub ebx,ebp // Subtract light theta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
and eax,0x0000ffff // Clear upper part of eax.
// AGI on ebx
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map intensity lookup.
MODIFY_FOR_ANGLETOINTENSITY_D:
shr eax,2 // Shift off extra bits.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
// AGI on eax
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_D:
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_D:
mov [ebp - 2],cx // Write to frame buffer.
END_OF_SCANLINE:
mov eax,[pscanGlbl]
mov ebp,bf_u_inc.i4Int
// AGI on eax.
mov ecx,[eax]TBumpLinear.indCoord.bfU.u4Frac
mov edx,[eax]TBumpLinear.indCoord.bfU.i4Int
mov edi,[eax]TBumpLinear.indCoord.w1dV.bfxValue.i4Int
mov esi,[eax]TBumpLinear.indCoord.w1dV.bfxValue.u4Frac
add edi,w1d_v_inc.bfxValue.i4Int
add ecx,bf_u_inc.u4Frac
adc edx,ebp
mov ebp,w1d_v_inc.bfxValue.u4Frac
add esi,ebp
jnc short NO_VFRAC_CARRY
add edi,[eax]TBumpLinear.indCoord.w1dV.iOffsetPerLine
NO_VFRAC_CARRY:
mov ebx,[eax]TBumpLinear.fxXDifference
mov ebp,[fx_diff]
add ebx,ebp
jge short NO_UNDERFLOW
// Undeflow of fxXDifference.
add ebx,0x00010000
mov ebp,bfNegDU.i4Int
add edi,w1dNegDV.bfxValue.i4Int
add ecx,bfNegDU.u4Frac
adc edx,ebp
mov ebp,w1dNegDV.bfxValue.u4Frac
add esi,ebp
jnc short EDGE_DONE
add edi,[eax]TBumpLinear.indCoord.w1dV.iOffsetPerLine
jmp short EDGE_DONE
NO_UNDERFLOW:
cmp ebx,0x00010000
jl short EDGE_DONE
// Overflow of fxXDifference.
sub ebx,0x00010000
mov ebp,bfNegDU.i4Int
add edi,w1dNegDV.bfxValue.i4Int
add ecx,bfNegDU.u4Frac
adc edx,ebp
mov ebp,w1dNegDV.bfxValue.u4Frac
add esi,ebp
jnc short EDGE_DONE
add edi,[eax]TBumpLinear.indCoord.w1dV.iOffsetPerLine
EDGE_DONE:
// Store modified variables and do looping.
mov [eax]TBumpLinear.indCoord.w1dV.bfxValue.u4Frac,esi
mov [eax]TBumpLinear.indCoord.w1dV.bfxValue.i4Int,edi
mov [eax]TBumpLinear.fxXDifference,ebx
mov esi,[pdtriGlbl] // Pointer to polygon object.
mov [eax]TBumpLinear.indCoord.bfU.u4Frac,ecx
mov [eax]TBumpLinear.indCoord.bfU.i4Int,edx
// Step length, line starting address.
mov ebx,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov ecx,[esi]CDrawPolygonBase.iLineStartIndex
add ebx,[esi]CDrawPolygonBase.fxDeltaLineLength.i4Fx
add ecx,[gsGlobals.u4LinePixels]
mov [esi]CDrawPolygonBase.fxLineLength.i4Fx,ebx
mov [esi]CDrawPolygonBase.iLineStartIndex,ecx
mov ecx,[eax]TBumpLinear.fxX
mov ebp,[fx_inc]
add ecx,ebp
mov edx,[esi]CDrawPolygonBase.iY
mov [eax]TBumpLinear.fxX,ecx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
pop ebp // Restore the base pointer.
}
}
#elif (iBUMPMAP_RESOLUTION == 32) // if (iBUMPMAP_RESOLUTION == 16)
//*****************************************************************************************
//
// Bumpmapped, Perspective correct and transparent for 16 bit screen.
//
void DrawSubtriangle(TBumpPerspTrans* pscan, CDrawPolygon<TBumpPerspTrans>* pdtri)
{
typedef TBumpPerspTrans::TIndex prevent_internal_compiler_errors;
TBumpPerspTrans* plinc = &pdtri->pedgeBase->lineIncrement;
__asm
{
//
// Do self-modifications here.
//
mov eax,[au1SubBumpToIntensity] // Load the pointer to the angle to intensity lookup table.
mov ebx,[pvClutConversion] // Clut conversion pointer.
mov ecx,[pvTextureBitmap]
mov [MODIFY_FOR_ANGLETOINTENSITY-4],eax
mov [MODIFY_FOR_CLUT_CONVERSION-4],ebx
inc ebx
mov [MODIFY_FOR_CLUT_CONVERSION_P1-4],ebx
mov [MODIFY_FOR_TEXTUREPOINTER_A-4],ecx
add ecx,3
mov [MODIFY_FOR_TEXTUREPOINTER_B-4],ecx
//
// Local copies of edge stepping values.
//
// fx_inc = pdtri->pedgeBase->lineIncrement.fxX;
// fx_diff = pdtri->pedgeBase->lineIncrement.fxXDifference;
// f_inc_uinvz = pdtri->pedgeBase->lineIncrement.indCoord.fUInvZ;
// f_inc_vinvz = pdtri->pedgeBase->lineIncrement.indCoord.fVInvZ;
// f_inc_invz = pdtri->pedgeBase->lineIncrement.indCoord.fInvZ;
//
mov eax,[plinc]
mov esi,[pdtri] // Pointer to polygon object.
mov ecx,[pscan] // Pointer to scanline object.
mov ebx,[eax]TBumpPerspTrans.fxX
mov edx,[eax]TBumpPerspTrans.fxXDifference
mov fx_inc,ebx
mov fx_diff,edx
mov ebx,[eax]TBumpPerspTrans.indCoord.fUInvZ
mov edx,[eax]TBumpPerspTrans.indCoord.fVInvZ
mov f_inc_uinvz,ebx
mov ebx,[eax]TBumpPerspTrans.indCoord.fInvZ
mov f_inc_vinvz,edx
mov f_inc_invz,ebx
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
push ebp // Save ebp.
// Check to see if we sould skip this scanline.
mov eax,[esi]CDrawPolygonBase.iY
mov ebx,[bEvenScanlinesOnly]
and eax,ebx
jnz END_OF_SCANLINE
// Setup for prespective correction and looping.
PERSPECTIVE_SCANLINE_PROLOGUE(TBumpPerspTrans)
//
// eax = i_pixel
// edi = inner loop count
// ecx,edx,esi = texture values
//
mov ebp,gsGlobals.pvScreen // Pointer the screen.
mov ebx,[i_screen_index] // Load scanline offset.
add ebx,eax // Add scanline offset to i_pixel
mov [i_pixel],eax // Save i_pixel.
mov eax,[u4TextureTileMask] // Load tiling mask.
and edx,eax // Mask for tiling.
lea ebp,[ebp+ebx*2] // Base of span in ebp.
mov [pvBaseOfLine],ebp // Keep pointer to base of span.
INNER_LOOP:
mov eax,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_A:
mov ebx,[u4LightTheta] // Get light theta.
test eax,0xff000000
jz short SKIP_TRANSPARENCY
sub eax,ebx // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and eax,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
mov bl,byte ptr[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_B:
mov bh,byte ptr[eax + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY:
mov eax,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
and ebx,0x0000FFFF // Mask off upper part of ebx
add esi,eax // Step the U fraction.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[ebx*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION:
mov eax,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[ebx*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_P1:
and edx,eax // Mask for tiling.
mov word ptr[ebp + edi*2],cx // Write to frame buffer.
inc edi // Increment index.
jnz short INNER_LOOP
jmp short EXIT_INNER_LOOP
SKIP_TRANSPARENCY:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load V fraction delta.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from V fractional add.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
and edx,ebx // Mask for tiling.
inc edi // Increment index.
jnz short INNER_LOOP
EXIT_INNER_LOOP:
// See if there are any pixels left.
cmp [i_pixel],0
jz END_OF_SCANLINE
// Do perspective correction and looping.
PERSPECTIVE_SCANLINE_EPILOGUE
END_OF_SCANLINE:
pop ebp
//
// Increment the base edge.
//
mov esi,[pdtri] // Pointer to polygon object.
mov ecx,[pscan] // Pointer to scanline object.
// Step length, line starting address.
mov eax,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov ebx,[esi]CDrawPolygonBase.iLineStartIndex
add eax,[esi]CDrawPolygonBase.fxDeltaLineLength.i4Fx
add ebx,[gsGlobals.u4LinePixels]
mov [esi]CDrawPolygonBase.fxLineLength.i4Fx,eax
mov [esi]CDrawPolygonBase.iLineStartIndex,ebx
// Step edge values.
mov eax,[ecx]TBumpPerspTrans.fxX.i4Fx
mov ebx,[ecx]TBumpPerspTrans.fxXDifference.i4Fx
fld [ecx]TBumpPerspTrans.indCoord.fUInvZ
fadd [f_inc_uinvz]
fld [ecx]TBumpPerspTrans.indCoord.fVInvZ
fadd [f_inc_vinvz]
fld [ecx]TBumpPerspTrans.indCoord.fInvZ
fadd [f_inc_invz]
add eax,[fx_inc]
add ebx,[fx_diff]
jge short NO_UNDERFLOW
// Underflow.
add ebx,0x00010000
jmp short BORROW_OR_CARRY
NO_UNDERFLOW:
cmp ebx,0x00010000
jle short NO_OVERFLOW
// Overflow.
sub ebx,0x00010000
jmp short BORROW_OR_CARRY
NO_OVERFLOW:
fstp [ecx]TBumpPerspTrans.indCoord.fInvZ
fstp [ecx]TBumpPerspTrans.indCoord.fVInvZ
fstp [ecx]TBumpPerspTrans.indCoord.fUInvZ
jmp short FINISH_LOOPING
BORROW_OR_CARRY:
fadd [fNegInvZ] // Z V U
fxch st(1) // V Z U
fadd [fNegVInvZ] // V Z U
fxch st(2) // U Z V
fadd [fNegUInvZ] // U Z V
fxch st(1) // Z U V
fstp [ecx]TBumpPerspTrans.indCoord.fInvZ
fstp [ecx]TBumpPerspTrans.indCoord.fUInvZ
fstp [ecx]TBumpPerspTrans.indCoord.fVInvZ
FINISH_LOOPING:
// Y Loop control.
mov [ecx]TBumpPerspTrans.fxX.i4Fx,eax
mov edx,[esi]CDrawPolygonBase.iY
mov [ecx]TBumpPerspTrans.fxXDifference.i4Fx,ebx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
}
}
//*****************************************************************************************
//
// Bumpmapped and Perspective correct for 16 bit screen.
//
void DrawSubtriangle(TBumpPersp* pscan, CDrawPolygon<TBumpPersp>* pdtri)
{
typedef TBumpPersp::TIndex prevent_internal_compiler_errors;
static void* pvLastClut = 0;
static void* pvLastTexture = 0;
static void* pvLastBumpToIntensity = 0;
TBumpPersp* plinc = &pdtri->pedgeBase->lineIncrement;
__asm
{
//
// Do self-modifications here.
//
mov eax,[pvTextureBitmap] // Texuremap pointer.
mov ebx,[pvClutConversion] // Clut conversion pointer.
mov edx,[au1SubBumpToIntensity] // Pointer to the angle to intensity lookup table.
mov ecx,[pvLastTexture]
mov esi,[pvLastClut]
mov edi,[pvLastBumpToIntensity]
cmp eax,ecx
jne short DO_MODIFY
cmp ebx,esi
jne short DO_MODIFY
cmp edx,edi
je short DONE_WITH_MODIFY
DO_MODIFY:
mov [pvLastTexture],eax
mov [pvLastClut],ebx
mov [pvLastBumpToIntensity],edx
lea ecx,[eax+3] // Texture pointer plus 3.
lea esi,[ebx+1] // Clut pointer plus one.
mov [MODIFY_FOR_TEXTUREPOINTER_E-4],eax
mov [MODIFY_FOR_ANGLETOINTENSITY_E-4],edx
mov [MODIFY_FOR_TEXTUREPOINTER_PL3_E-4],ecx
mov [MODIFY_FOR_CLUT_CONVERSION_E-4],ebx
mov [MODIFY_FOR_CLUT_CONVERSION_PL1_E-4],esi
mov [MODIFY_FOR_TEXTUREPOINTER_F-4],eax
mov [MODIFY_FOR_ANGLETOINTENSITY_F-4],edx
mov [MODIFY_FOR_TEXTUREPOINTER_PL3_F-4],ecx
mov [MODIFY_FOR_CLUT_CONVERSION_F-4],ebx
mov [MODIFY_FOR_CLUT_CONVERSION_PL1_F-4],esi
mov [MODIFY_FOR_TEXTUREPOINTER_G-4],eax
mov [MODIFY_FOR_ANGLETOINTENSITY_G-4],edx
mov [MODIFY_FOR_TEXTUREPOINTER_PL3_G-4],ecx
mov [MODIFY_FOR_CLUT_CONVERSION_G-4],ebx
mov [MODIFY_FOR_CLUT_CONVERSION_PL1_G-4],esi
mov [MODIFY_FOR_TEXTUREPOINTER_H-4],eax
mov [MODIFY_FOR_ANGLETOINTENSITY_H-4],edx
mov [MODIFY_FOR_TEXTUREPOINTER_PL3_H-4],ecx
mov [MODIFY_FOR_CLUT_CONVERSION_H-4],ebx
mov [MODIFY_FOR_CLUT_CONVERSION_PL1_H-4],esi
DONE_WITH_MODIFY:
//
// Local copies of edge stepping values.
//
// fx_inc = pdtri->pedgeBase->lineIncrement.fxX;
// fx_diff = pdtri->pedgeBase->lineIncrement.fxXDifference;
// f_inc_uinvz = pdtri->pedgeBase->lineIncrement.indCoord.fUInvZ;
// f_inc_vinvz = pdtri->pedgeBase->lineIncrement.indCoord.fVInvZ;
// f_inc_invz = pdtri->pedgeBase->lineIncrement.indCoord.fInvZ;
//
mov eax,[plinc]
mov esi,[pdtri] // Pointer to polygon object.
mov ecx,[pscan] // Pointer to scanline object.
mov ebx,[eax]TBumpPersp.fxX
mov edx,[eax]TBumpPersp.fxXDifference
mov fx_inc,ebx
mov fx_diff,edx
mov ebx,[eax]TBumpPersp.indCoord.fUInvZ
mov edx,[eax]TBumpPersp.indCoord.fVInvZ
mov f_inc_uinvz,ebx
mov ebx,[eax]TBumpPersp.indCoord.fInvZ
mov f_inc_vinvz,edx
mov f_inc_invz,ebx
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
push ebp // Save ebp.
// Check to see if we sould skip this scanline.
mov eax,[esi]CDrawPolygonBase.iY
mov ebx,[bEvenScanlinesOnly]
and eax,ebx
jnz short END_OF_SCANLINE
// Setup for prespective correction and looping.
PERSPECTIVE_SCANLINE_PROLOGUE(TBumpPersp)
//
// eax = i_pixel
// edi = inner loop count
// ecx,edx,esi = texture values
//
mov ebp,gsGlobals.pvScreen // Pointer the screen.
mov ebx,[i_screen_index] // Load scanline offset.
add ebx,eax // Add scanline offset to i_pixel
mov [i_pixel],eax // Save i_pixel.
mov eax,[u4TextureTileMask] // Load tiling mask.
and edx,eax // Mask for tiling.
lea ebp,[ebp+ebx*2] // Base of span in ebp.
mov [pvBaseOfLine],ebp // Keep pointer to base of span.
lea eax,[ebp+edi*2]
// Check alignement.
test eax,3
jz short ALIGNED
//
// Do one pixel for alignment.
//
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_E:
mov eax,[u4LightTheta] // Get light theta.
sub ebx,eax // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
mov al,byte ptr[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_PL3_E:
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY_E:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
and eax,0x0000FFFF // Mask off upper part to eax.
add esi,ebx // Step the U fraction.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_E:
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_E:
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],cx // Write to frame buffer.
inc edi
jz short DONE_WITH_SPAN
ALIGNED:
// Make sure we have two pixels left.
add edi,2
jg short FINISH_REMAINDER
//
// Do two pixels at a time.
//
INNER_LOOP_2P:
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_F:
mov eax,[u4LightTheta] // Get light theta.
sub ebx,eax // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
mov al,byte ptr[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_PL3_F:
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY_F:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Load the integer step based on v carry.
and eax,0x0000FFFF // Mask off upper part to eax.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add the integer values from the integer table, and add a possible carry.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_F:
and edx,ebx // Mask for tiling.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_F:
mov eax,[u4LightTheta] // Get light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_G:
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
sub ebx,eax // Subtract light theta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
xor eax,eax // Clear eax.
mov al,byte ptr[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_PL3_G:
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Load the integer step based on v carry.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY_G:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
mov ebx,ecx // Get copy of low texture word.
adc edx,ebp // Add the integer values from the integer table, and add a possible carry.
mov ebp,[u4TextureTileMask] // Load tiling mask.
shl ebx,16 // Shift low pixel up.
and edx,ebp // Mask for tiling.
mov bh,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_G:
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov bl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_G:
add edi,2 // Step count.
bswap ebx // Swap pixels into place.
mov dword ptr[ebp + edi*2 - 8],ebx // Write to frame buffer.
jle short INNER_LOOP_2P
//
// Finish left over pixel (if any)
//
FINISH_REMAINDER:
// edi is 1 if there is a pixel left.
cmp edi,1
jne short DONE_WITH_SPAN
//
// One pixel, update texture values.
//
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_H:
mov eax,[u4LightTheta] // Get light theta.
sub ebx,eax // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
mov al,byte ptr[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_PL3_H:
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY_H:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
and eax,0x0000FFFF // Mask off upper part to eax.
add esi,ebx // Step the U fraction.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_H:
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_H:
and edx,ebx // Mask for tiling.
mov word ptr[ebp - 2],cx // Write to frame buffer.
DONE_WITH_SPAN:
// See if there are any pixels left.
cmp [i_pixel],0
jz END_OF_SCANLINE
// Do perspective correction and looping.
PERSPECTIVE_SCANLINE_EPILOGUE
END_OF_SCANLINE:
pop ebp
//
// Increment the base edge.
//
mov esi,[pdtri] // Pointer to polygon object.
mov ecx,[pscan] // Pointer to scanline object.
// Step length, line starting address.
mov eax,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov ebx,[esi]CDrawPolygonBase.iLineStartIndex
add eax,[esi]CDrawPolygonBase.fxDeltaLineLength.i4Fx
add ebx,[gsGlobals.u4LinePixels]
mov [esi]CDrawPolygonBase.fxLineLength.i4Fx,eax
mov [esi]CDrawPolygonBase.iLineStartIndex,ebx
// Step edge values.
mov eax,[ecx]TBumpPersp.fxX.i4Fx
mov ebx,[ecx]TBumpPersp.fxXDifference.i4Fx
fld [ecx]TBumpPersp.indCoord.fUInvZ
fadd [f_inc_uinvz]
fld [ecx]TBumpPersp.indCoord.fVInvZ
fadd [f_inc_vinvz]
fld [ecx]TBumpPersp.indCoord.fInvZ
fadd [f_inc_invz]
add eax,[fx_inc]
add ebx,[fx_diff]
jge short NO_UNDERFLOW
// Underflow.
add ebx,0x00010000
jmp short BORROW_OR_CARRY
NO_UNDERFLOW:
cmp ebx,0x00010000
jle short NO_OVERFLOW
// Overflow.
sub ebx,0x00010000
jmp short BORROW_OR_CARRY
NO_OVERFLOW:
fstp [ecx]TBumpPersp.indCoord.fInvZ
fstp [ecx]TBumpPersp.indCoord.fVInvZ
fstp [ecx]TBumpPersp.indCoord.fUInvZ
jmp short FINISH_LOOPING
BORROW_OR_CARRY:
fadd [fNegInvZ] // Z V U
fxch st(1) // V Z U
fadd [fNegVInvZ] // V Z U
fxch st(2) // U Z V
fadd [fNegUInvZ] // U Z V
fxch st(1) // Z U V
fstp [ecx]TBumpPersp.indCoord.fInvZ
fstp [ecx]TBumpPersp.indCoord.fUInvZ
fstp [ecx]TBumpPersp.indCoord.fVInvZ
FINISH_LOOPING:
// Y Loop control.
mov [ecx]TBumpPersp.fxX.i4Fx,eax
mov edx,[esi]CDrawPolygonBase.iY
mov [ecx]TBumpPersp.fxXDifference.i4Fx,ebx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
}
}
//*****************************************************************************************
//
// Bumpmapped, Linear and transparent for 16 bit screen.
//
void DrawSubtriangle(TBumpLinearTrans* pscan, CDrawPolygon<TBumpLinearTrans>* pdtri)
{
typedef TBumpLinearTrans::TIndex prevent_internal_compiler_errors;
static CDrawPolygon<TBumpLinearTrans>* pdtriGlbl;
static TBumpLinearTrans* pscanGlbl;
TBumpLinearTrans* plinc = &pdtri->pedgeBase->lineIncrement;
__asm
{
//
// Do self-modifications here.
//
mov eax,[au1SubBumpToIntensity] // Load the pointer to the angle to intensity lookup table.
mov ebx,[pvClutConversion] // Clut conversion pointer.
mov ecx,[pvTextureBitmap]
mov [MODIFY_FOR_ANGLETOINTENSITY-4],eax
mov [MODIFY_FOR_CLUT_CONVERSION-4],ebx
inc ebx
mov [MODIFY_FOR_CLUT_CONVERSION_P1-4],ebx
mov [MODIFY_FOR_TEXTUREPOINTER_A-4],ecx
add ecx,3
mov [MODIFY_FOR_TEXTUREPOINTER_B-4],ecx
push ebp // Save ebp.
mov edi,[plinc] // Pointer to scanline increment.
mov eax,[pscan] // Pointer to scanline.
mov esi,[pdtri] // Pointer to polygon.
//
// Copies of edge stepping values.
//
// fx_inc = pdtri->pedgeBase->lineIncrement.fxX;
// fx_diff = pdtri->pedgeBase->lineIncrement.fxXDifference;
// bf_u_inc = pdtri->pedgeBase->lineIncrement.indCoord.bfU;
// w1d_v_inc = pdtri->pedgeBase->lineIncrement.indCoord.w1dV;
// pscanCopy = pscan;
// pdtriCopy = pdtri;
//
mov ebx,[edi]TBumpLinearTrans.fxX
mov ecx,[edi]TBumpLinearTrans.fxXDifference
mov fx_inc,ebx
mov fx_diff,ecx
mov ebx,[edi]TBumpLinearTrans.indCoord.bfU.i4Int
mov ecx,[edi]TBumpLinearTrans.indCoord.bfU.u4Frac
mov bf_u_inc.i4Int,ebx
mov bf_u_inc.u4Frac,ecx
mov ebx,[edi]TBumpLinearTrans.indCoord.w1dV.bfxValue.i4Int
mov ecx,[edi]TBumpLinearTrans.indCoord.w1dV.bfxValue.u4Frac
mov w1d_v_inc.bfxValue.i4Int,ebx
mov w1d_v_inc.bfxValue.u4Frac,ecx
mov pdtriGlbl,esi
mov pscanGlbl,eax
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
// Check to see if we should skip this scanline.
mov ecx,[esi]CDrawPolygonBase.iY
mov ebx,[bEvenScanlinesOnly]
and ecx,ebx
jnz END_OF_SCANLINE
// Determine the start and end of the scanline.
mov ebx,[eax]TBumpLinearTrans.fxX.i4Fx
mov ecx,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov edx,[esi]CDrawPolygonBase.iLineStartIndex
add ebx,ecx
sar ebx,16
mov edi,[eax]TBumpLinearTrans.fxX.i4Fx
sar edi,16
add edx,ebx
sub edi,ebx // i_pixel
jge END_OF_SCANLINE
//
// edi = i_pixel
// edx = i_screen_index
// ecx = pointer to scanline
//
mov ebp,gsGlobals.pvScreen // Pointer the screen.
mov ebx,[eax]TBumpLinearTrans.indCoord.bfU.i4Int // Uint
mov esi,[eax]TBumpLinearTrans.indCoord.bfU.u4Frac // Ufrac
mov ecx,[eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.u4Frac // Vfrac
lea ebp,[ebp+edx*2] // Base of scanline.
mov edx,[eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.i4Int // Vint
add edx,ebx // Add Uint to Vint
mov ebx,[u4TextureTileMask] // Load tiling mask.
and edx,ebx // Mask for tiling.
mov [pvBaseOfLine],ebp // Save pointer to base of line.
INNER_LOOP:
mov eax,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_A:
mov ebx,[u4LightTheta] // Get light theta.
test eax,0xff000000
jz short SKIP_TRANSPARENCY
sub eax,ebx // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and eax,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
mov bl,byte ptr[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_B:
mov bh,byte ptr[eax + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY:
mov eax,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
and ebx,0x0000FFFF // Mask off upper part of ebx
add esi,eax // Step the U fraction.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[ebx*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION:
mov eax,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[ebx*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_P1:
and edx,eax // Mask for tiling.
mov word ptr[ebp + edi*2],cx // Write to frame buffer.
inc edi // Increment index.
jnz short INNER_LOOP
jmp short END_OF_SCANLINE
SKIP_TRANSPARENCY:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load V fraction delta.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from V fractional add.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
mov ebx,[u4TextureTileMask] // Load tiling mask.
and edx,ebx // Mask for tiling.
inc edi // Step index.
jnz short INNER_LOOP
END_OF_SCANLINE:
mov eax,[pscanGlbl]
mov ebp,bf_u_inc.i4Int
// AGI on eax.
mov ecx,[eax]TBumpLinearTrans.indCoord.bfU.u4Frac
mov edx,[eax]TBumpLinearTrans.indCoord.bfU.i4Int
mov edi,[eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.i4Int
mov esi,[eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.u4Frac
add edi,w1d_v_inc.bfxValue.i4Int
add ecx,bf_u_inc.u4Frac
adc edx,ebp
mov ebp,w1d_v_inc.bfxValue.u4Frac
add esi,ebp
jnc short NO_VFRAC_CARRY
add edi,[eax]TBumpLinearTrans.indCoord.w1dV.iOffsetPerLine
NO_VFRAC_CARRY:
mov ebx,[eax]TBumpLinearTrans.fxXDifference
mov ebp,[fx_diff]
add ebx,ebp
jge short NO_UNDERFLOW
// Undeflow of fxXDifference.
add ebx,0x00010000
mov ebp,bfNegDU.i4Int
add edi,w1dNegDV.bfxValue.i4Int
add ecx,bfNegDU.u4Frac
adc edx,ebp
mov ebp,w1dNegDV.bfxValue.u4Frac
add esi,ebp
jnc short EDGE_DONE
add edi,[eax]TBumpLinearTrans.indCoord.w1dV.iOffsetPerLine
jmp short EDGE_DONE
NO_UNDERFLOW:
cmp ebx,0x00010000
jl short EDGE_DONE
// Overflow of fxXDifference.
sub ebx,0x00010000
mov ebp,bfNegDU.i4Int
add edi,w1dNegDV.bfxValue.i4Int
add ecx,bfNegDU.u4Frac
adc edx,ebp
mov ebp,w1dNegDV.bfxValue.u4Frac
add esi,ebp
jnc short EDGE_DONE
add edi,[eax]TBumpLinearTrans.indCoord.w1dV.iOffsetPerLine
EDGE_DONE:
// Store modified variables and do looping.
mov [eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.u4Frac,esi
mov [eax]TBumpLinearTrans.indCoord.w1dV.bfxValue.i4Int,edi
mov [eax]TBumpLinearTrans.fxXDifference,ebx
mov esi,[pdtriGlbl] // Pointer to polygon object.
mov [eax]TBumpLinearTrans.indCoord.bfU.u4Frac,ecx
mov [eax]TBumpLinearTrans.indCoord.bfU.i4Int,edx
// Step length, line starting address.
mov ebx,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov ecx,[esi]CDrawPolygonBase.iLineStartIndex
add ebx,[esi]CDrawPolygonBase.fxDeltaLineLength.i4Fx
add ecx,[gsGlobals.u4LinePixels]
mov [esi]CDrawPolygonBase.fxLineLength.i4Fx,ebx
mov [esi]CDrawPolygonBase.iLineStartIndex,ecx
mov ecx,[eax]TBumpLinearTrans.fxX
mov ebp,[fx_inc]
add ecx,ebp
mov edx,[esi]CDrawPolygonBase.iY
mov [eax]TBumpLinearTrans.fxX,ecx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
pop ebp // Restore the base pointer.
}
}
//*****************************************************************************************
//
// Bumpmapped and Linear for 16 bit screen.
//
void DrawSubtriangle(TBumpLinear* pscan, CDrawPolygon<TBumpLinear>* pdtri)
{
typedef TBumpLinear::TIndex prevent_internal_compiler_errors;
static void* pvLastClut = 0;
static void* pvLastTexture = 0;
static void* pvLastBumpToIntensity = 0;
static CDrawPolygon<TBumpLinear>* pdtriGlbl;
static TBumpLinear* pscanGlbl;
TBumpLinear* plinc = &pdtri->pedgeBase->lineIncrement;
__asm
{
//
// Do self-modifications here.
//
mov eax,[pvTextureBitmap] // Texuremap pointer.
mov ebx,[pvClutConversion] // Clut conversion pointer.
mov edx,[au1SubBumpToIntensity] // Pointer to the angle to intensity lookup table.
mov ecx,[pvLastTexture]
mov esi,[pvLastClut]
mov edi,[pvLastBumpToIntensity]
cmp eax,ecx
jne short DO_MODIFY
cmp ebx,esi
jne short DO_MODIFY
cmp edx,edi
je short DONE_WITH_MODIFY
DO_MODIFY:
mov [pvLastTexture],eax
mov [pvLastClut],ebx
mov [pvLastBumpToIntensity],edx
lea ecx,[eax+3] // Texture pointer plus 3.
lea esi,[ebx+1] // Clut pointer plus one.
mov [MODIFY_FOR_TEXTUREPOINTER_E-4],eax
mov [MODIFY_FOR_ANGLETOINTENSITY_E-4],edx
mov [MODIFY_FOR_TEXTUREPOINTER_PL3_E-4],ecx
mov [MODIFY_FOR_CLUT_CONVERSION_E-4],ebx
mov [MODIFY_FOR_CLUT_CONVERSION_PL1_E-4],esi
mov [MODIFY_FOR_TEXTUREPOINTER_F-4],eax
mov [MODIFY_FOR_ANGLETOINTENSITY_F-4],edx
mov [MODIFY_FOR_TEXTUREPOINTER_PL3_F-4],ecx
mov [MODIFY_FOR_CLUT_CONVERSION_F-4],ebx
mov [MODIFY_FOR_CLUT_CONVERSION_PL1_F-4],esi
mov [MODIFY_FOR_TEXTUREPOINTER_G-4],eax
mov [MODIFY_FOR_ANGLETOINTENSITY_G-4],edx
mov [MODIFY_FOR_TEXTUREPOINTER_PL3_G-4],ecx
mov [MODIFY_FOR_CLUT_CONVERSION_G-4],ebx
mov [MODIFY_FOR_CLUT_CONVERSION_PL1_G-4],esi
mov [MODIFY_FOR_TEXTUREPOINTER_H-4],eax
mov [MODIFY_FOR_ANGLETOINTENSITY_H-4],edx
mov [MODIFY_FOR_TEXTUREPOINTER_PL3_H-4],ecx
mov [MODIFY_FOR_CLUT_CONVERSION_H-4],ebx
mov [MODIFY_FOR_CLUT_CONVERSION_PL1_H-4],esi
DONE_WITH_MODIFY:
push ebp // Save ebp.
mov edi,[plinc] // Pointer to scanline increment.
mov eax,[pscan] // Pointer to scanline.
mov esi,[pdtri] // Pointer to polygon.
//
// Copies of edge stepping values.
//
// fx_inc = pdtri->pedgeBase->lineIncrement.fxX;
// fx_diff = pdtri->pedgeBase->lineIncrement.fxXDifference;
// bf_u_inc = pdtri->pedgeBase->lineIncrement.indCoord.bfU;
// w1d_v_inc = pdtri->pedgeBase->lineIncrement.indCoord.w1dV;
// pscanCopy = pscan;
// pdtriCopy = pdtri;
//
mov ebx,[edi]TBumpLinear.fxX
mov ecx,[edi]TBumpLinear.fxXDifference
mov fx_inc,ebx
mov fx_diff,ecx
mov ebx,[edi]TBumpLinear.indCoord.bfU.i4Int
mov ecx,[edi]TBumpLinear.indCoord.bfU.u4Frac
mov bf_u_inc.i4Int,ebx
mov bf_u_inc.u4Frac,ecx
mov ebx,[edi]TBumpLinear.indCoord.w1dV.bfxValue.i4Int
mov ecx,[edi]TBumpLinear.indCoord.w1dV.bfxValue.u4Frac
mov w1d_v_inc.bfxValue.i4Int,ebx
mov w1d_v_inc.bfxValue.u4Frac,ecx
mov pdtriGlbl,esi
mov pscanGlbl,eax
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
// Check to see if we should skip this scanline.
mov ecx,[esi]CDrawPolygonBase.iY
mov ebx,[bEvenScanlinesOnly]
and ecx,ebx
jnz END_OF_SCANLINE
// Determine the start and end of the scanline.
mov ebx,[eax]TBumpLinear.fxX.i4Fx
mov ecx,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov edx,[esi]CDrawPolygonBase.iLineStartIndex
add ebx,ecx
sar ebx,16
mov edi,[eax]TBumpLinear.fxX.i4Fx
sar edi,16
add edx,ebx
sub edi,ebx // i_pixel
jge END_OF_SCANLINE
//
// edi = i_pixel
// edx = i_screen_index
// ecx = pointer to scanline
//
mov ebp,gsGlobals.pvScreen // Pointer the screen.
mov ebx,[eax]TBumpLinear.indCoord.bfU.i4Int // Uint
mov esi,[eax]TBumpLinear.indCoord.bfU.u4Frac // Ufrac
lea ebp,[ebp+edx*2] // Base of scanline.
mov edx,[eax]TBumpLinear.indCoord.w1dV.bfxValue.i4Int // Vint
add edx,ebx // Add Uint to Vint
mov ecx,[eax]TBumpLinear.indCoord.w1dV.bfxValue.u4Frac // Vfrac
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov [pvBaseOfLine],ebp // Save pointer to base of line.
and edx,ebx // Mask for tiling.
lea eax,[ebp+edi*2]
// Check alignement.
test eax,3
jz short ALIGNED
//
// Do one pixel for alignment.
//
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_E:
mov eax,[u4LightTheta] // Get light theta.
sub ebx,eax // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
mov al,byte ptr[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_PL3_E:
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY_E:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
and eax,0x0000FFFF // Mask off upper part to eax.
add esi,ebx // Step the U fraction.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_E:
mov ebx,[u4TextureTileMask] // Load tiling mask.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_E:
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],cx // Write to frame buffer.
inc edi
jz short END_OF_SCANLINE
ALIGNED:
// Make sure we have two pixels left.
add edi,2
jg short FINISH_REMAINDER
//
// Do two pixels at a time.
//
INNER_LOOP_2P:
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_F:
mov eax,[u4LightTheta] // Get light theta.
sub ebx,eax // Subtract light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
mov al,byte ptr[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_PL3_F:
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY_F:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Load the integer step based on v carry.
and eax,0x0000FFFF // Mask off upper part to eax.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
adc edx,ebp // Add the integer values from the integer table, and add a possible carry.
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_F:
and edx,ebx // Mask for tiling.
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_F:
mov eax,[u4LightTheta] // Get light theta.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_G:
add ecx,ebp // Step the V fraction.
sbb ebp,ebp // Get carry from v fractional add.
sub ebx,eax // Subtract light theta.
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
xor eax,eax // Clear eax.
mov al,byte ptr[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_PL3_G:
mov ebp,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Load the integer step based on v carry.
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY_G:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
mov ebx,ecx // Get copy of low texture word.
adc edx,ebp // Add the integer values from the integer table, and add a possible carry.
mov ebp,[u4TextureTileMask] // Load tiling mask.
shl ebx,16 // Shift low pixel up.
and edx,ebp // Mask for tiling.
mov bh,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_G:
mov ebp,[pvBaseOfLine] // Load desination base pointer.
mov bl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_G:
add edi,2 // Step count.
bswap ebx // Swap pixels into place.
mov dword ptr[ebp + edi*2 - 8],ebx // Write to frame buffer.
jle short INNER_LOOP_2P
//
// Finish left over pixel (if any)
//
FINISH_REMAINDER:
// edi is 1 if there is a pixel left.
cmp edi,1
jne short END_OF_SCANLINE
//
// One pixel without updating texture values.
//
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_H:
mov eax,[u4LightTheta] // Get light theta.
sub ebx,eax // Subtract light theta.
xor eax,eax // Clear eax
and ebx,iMASK_ANGLETABLE_LOOKUP // Mask for bump map table index.
mov al,byte ptr[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER_PL3_H:
// AGI on ebx
mov ah,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY_H:
mov ebp,[pvBaseOfLine] // Load desination base pointer.
// AGI on eax
mov cl,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (low).
MODIFY_FOR_CLUT_CONVERSION_H:
mov ch,byte ptr[eax*2 + 0xDEADBEEF] // Intesity lookup (high).
MODIFY_FOR_CLUT_CONVERSION_PL1_H:
mov word ptr[ebp -2],cx // Write to frame buffer.
END_OF_SCANLINE:
mov eax,[pscanGlbl]
mov ebp,bf_u_inc.i4Int
// AGI on eax.
mov ecx,[eax]TBumpLinear.indCoord.bfU.u4Frac
mov edx,[eax]TBumpLinear.indCoord.bfU.i4Int
mov edi,[eax]TBumpLinear.indCoord.w1dV.bfxValue.i4Int
mov esi,[eax]TBumpLinear.indCoord.w1dV.bfxValue.u4Frac
add edi,w1d_v_inc.bfxValue.i4Int
add ecx,bf_u_inc.u4Frac
adc edx,ebp
mov ebp,w1d_v_inc.bfxValue.u4Frac
add esi,ebp
jnc short NO_VFRAC_CARRY
add edi,[eax]TBumpLinear.indCoord.w1dV.iOffsetPerLine
NO_VFRAC_CARRY:
mov ebx,[eax]TBumpLinear.fxXDifference
mov ebp,[fx_diff]
add ebx,ebp
jge short NO_UNDERFLOW
// Undeflow of fxXDifference.
add ebx,0x00010000
mov ebp,bfNegDU.i4Int
add edi,w1dNegDV.bfxValue.i4Int
add ecx,bfNegDU.u4Frac
adc edx,ebp
mov ebp,w1dNegDV.bfxValue.u4Frac
add esi,ebp
jnc short EDGE_DONE
add edi,[eax]TBumpLinear.indCoord.w1dV.iOffsetPerLine
jmp short EDGE_DONE
NO_UNDERFLOW:
cmp ebx,0x00010000
jl short EDGE_DONE
// Overflow of fxXDifference.
sub ebx,0x00010000
mov ebp,bfNegDU.i4Int
add edi,w1dNegDV.bfxValue.i4Int
add ecx,bfNegDU.u4Frac
adc edx,ebp
mov ebp,w1dNegDV.bfxValue.u4Frac
add esi,ebp
jnc short EDGE_DONE
add edi,[eax]TBumpLinear.indCoord.w1dV.iOffsetPerLine
EDGE_DONE:
// Store modified variables and do looping.
mov [eax]TBumpLinear.indCoord.w1dV.bfxValue.u4Frac,esi
mov [eax]TBumpLinear.indCoord.w1dV.bfxValue.i4Int,edi
mov [eax]TBumpLinear.fxXDifference,ebx
mov esi,[pdtriGlbl] // Pointer to polygon object.
mov [eax]TBumpLinear.indCoord.bfU.u4Frac,ecx
mov [eax]TBumpLinear.indCoord.bfU.i4Int,edx
// Step length, line starting address.
mov ebx,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov ecx,[esi]CDrawPolygonBase.iLineStartIndex
add ebx,[esi]CDrawPolygonBase.fxDeltaLineLength.i4Fx
add ecx,[gsGlobals.u4LinePixels]
mov [esi]CDrawPolygonBase.fxLineLength.i4Fx,ebx
mov [esi]CDrawPolygonBase.iLineStartIndex,ecx
mov ecx,[eax]TBumpLinear.fxX
mov ebp,[fx_inc]
add ecx,ebp
mov edx,[esi]CDrawPolygonBase.iY
mov [eax]TBumpLinear.fxX,ecx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
pop ebp // Restore the base pointer.
}
}
#endif // elif (iBUMPMAP_RESOLUTION == 32)
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