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JurassicParkTrespasser/jp2_pc/Source/Lib/Renderer/Primitives/P6/DrawSubTriangleBumpEx.inl

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/***********************************************************************************************
*
* Copyright © DreamWorks Interactive, 1997.
*
* Contents:
* Specialized (non-template) versions of the DrawSubtriangle function.
* Optimized for the Pentium Pro Processor
*
***********************************************************************************************
*
* $Log:: /JP2_PC/Source/Lib/Renderer/Primitives/P6/DrawSubTriangleBumpEx.cpp $
*
* 8 98.08.13 4:26p Mmouni
* Changes for VC++ 5.0sp3 compatibility.
*
* 7 98/01/22 5:39p Mmouni
* Added support for 16-bit bump-maps.
*
* 6 97.12.01 4:26p Mmouni
* P6 optimized version created from P5 optimized version.
*
* 5 9/01/97 8:05p Rwyatt
* ANDs added to enable tiling
*
* 4 8/25/97 5:26p Rwyatt
* New bump mapping code for linear non-transparent
*
* 3 97/07/18 3:29p Pkeet
* Removed use of the 'b_right' parameter from DrawSubTriangle.
*
* 2 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.)
*
* 1 7/08/97 1:15p Rwyatt
* Initial Implementation of Pentium Pro rendering specific optimizations
*
***********************************************************************************************
***********************************************************************************************
*
* 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 [pvLastBumpToIntensity],edx
mov [pvLastClut],ebx
lea edi,MODIFY_FOR_TEXTUREPOINTER
mov [edi-4],eax
lea edi,MODIFY_FOR_ANGLETOINTENSITY
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION
mov [edi-4],ebx
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 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.
jmp short INNER_LOOP
ALIGN 16
//-----------------------------------------------------------------------
// Draw pixels.
//
INNER_LOOP:
movzx ebx,word ptr[edx*2 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
test ebx,0xfc00 // Test color value of pixel.
jz short SKIP_TRANSPARENT // Skip over transparent pixels.
mov eax,ebx // Copy texture value.
sub ebx,[u4LightTheta] // Subtract light theta.
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.
shr eax,10 // Shift color value down.
movzx ebx,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY:
shl ebx,7 // Shift intensity up.
mov ax,word ptr[eax*2 + ebx + 0xDEADBEEF] // CLUT lookup.
MODIFY_FOR_CLUT_CONVERSION:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
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.
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],ax // Write to frame buffer.
inc edi
jnz short INNER_LOOP
jmp short EXIT_INNER_LOOP
SKIP_TRANSPARENT:
add ecx,ebp // Step the V fraction.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
mov eax,[u4TextureTileMask] // Load tiling mask.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
and edx,eax // Mask for tiling.
inc edi // Step 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 [pvLastBumpToIntensity],edx
mov [pvLastClut],ebx
lea edi,MODIFY_FOR_TEXTUREPOINTER
mov [edi-4],eax
lea edi,MODIFY_FOR_ANGLETOINTENSITY
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION
mov [edi-4],ebx
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.
jmp short INNER_LOOP
ALIGN 16
//-----------------------------------------------------------------------
// Draw pixels.
//
INNER_LOOP:
movzx ebx,word ptr[edx*2 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov eax,ebx // Copy texture value.
sub ebx,[u4LightTheta] // Subtract light theta.
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.
shr eax,10 // Shift color value down.
movzx ebx,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY:
shl ebx,7 // Shift intensity up.
mov ax,word ptr[eax*2 + ebx + 0xDEADBEEF] // CLUT lookup.
MODIFY_FOR_CLUT_CONVERSION:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
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.
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],ax // Write to frame buffer.
inc edi
jnz short 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]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 [pvLastBumpToIntensity],edx
mov [pvLastClut],ebx
lea edi,MODIFY_FOR_TEXTUREPOINTER
mov [edi-4],eax
lea edi,MODIFY_FOR_ANGLETOINTENSITY
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION
mov [edi-4],ebx
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
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.
jmp short INNER_LOOP
ALIGN 16
//-----------------------------------------------------------------------
// Draw pixels.
//
INNER_LOOP:
movzx ebx,word ptr[edx*2 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
test ebx,0xfc00 // Test color value of pixel.
jz short SKIP_TRANSPARENT // Skip over transparent pixels.
mov eax,ebx // Copy texture value.
sub ebx,[u4LightTheta] // Subtract light theta.
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.
shr eax,10 // Shift color value down.
movzx ebx,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY:
shl ebx,7 // Shift intensity up.
mov ax,word ptr[eax*2 + ebx + 0xDEADBEEF] // CLUT lookup.
MODIFY_FOR_CLUT_CONVERSION:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
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.
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],ax // Write to frame buffer.
inc edi
jnz short INNER_LOOP
jmp short END_OF_SCANLINE
SKIP_TRANSPARENT:
add ecx,ebp // Step the V fraction.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
mov eax,[u4TextureTileMask] // Load tiling mask.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
and edx,eax // 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 [pvLastBumpToIntensity],edx
mov [pvLastClut],ebx
lea edi,MODIFY_FOR_TEXTUREPOINTER
mov [edi-4],eax
lea edi,MODIFY_FOR_ANGLETOINTENSITY
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION
mov [edi-4],ebx
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.
and edx,ebx // Mask for tiling.
mov [pvBaseOfLine],ebp // Save pointer to base of line.
jmp short INNER_LOOP
ALIGN 16
//-----------------------------------------------------------------------
// Draw pixels.
//
INNER_LOOP:
movzx ebx,word ptr[edx*2 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov eax,ebx // Copy texture value.
sub ebx,[u4LightTheta] // Subtract light theta.
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.
shr eax,10 // Shift color value down.
movzx ebx,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY:
shl ebx,7 // Shift intensity up.
mov ax,word ptr[eax*2 + ebx + 0xDEADBEEF] // CLUT lookup.
MODIFY_FOR_CLUT_CONVERSION:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
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.
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],ax // Write to frame buffer.
inc edi
jnz short INNER_LOOP
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;
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 [pvLastBumpToIntensity],edx
mov [pvLastClut],ebx
lea edi,MODIFY_FOR_TEXTUREPOINTER
mov [edi-4],eax
lea edi,MODIFY_FOR_ANGLETOINTENSITY
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION
mov [edi-4],ebx
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 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.
jmp short INNER_LOOP
ALIGN 16
//-----------------------------------------------------------------------
// Draw pixels.
//
INNER_LOOP:
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
test ebx,0xff000000 // Test color value of pixel.
jz short SKIP_TRANSPARENT // Skip over transparent pixels.
mov eax,ebx // Copy texture value.
sub ebx,[u4LightTheta] // Subtract light theta.
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.
shr eax,24 // Shift color value down.
movzx ebx,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY:
shl ebx,9 // Shift intensity up.
mov ax,word ptr[eax*2 + ebx + 0xDEADBEEF] // CLUT lookup.
MODIFY_FOR_CLUT_CONVERSION:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
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.
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],ax // Write to frame buffer.
inc edi
jnz short INNER_LOOP
jmp short EXIT_INNER_LOOP
SKIP_TRANSPARENT:
add ecx,ebp // Step the V fraction.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
mov eax,[u4TextureTileMask] // Load tiling mask.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
and edx,eax // Mask for tiling.
inc edi // Step 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 [pvLastBumpToIntensity],edx
mov [pvLastClut],ebx
lea edi,MODIFY_FOR_TEXTUREPOINTER
mov [edi-4],eax
lea edi,MODIFY_FOR_ANGLETOINTENSITY
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION
mov [edi-4],ebx
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.
jmp short INNER_LOOP
ALIGN 16
//-----------------------------------------------------------------------
// Draw pixels.
//
INNER_LOOP:
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov eax,ebx // Copy texture value.
sub ebx,[u4LightTheta] // Subtract light theta.
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.
shr eax,24 // Shift color value down.
movzx ebx,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY:
shl ebx,9 // Shift intensity up.
mov ax,word ptr[eax*2 + ebx + 0xDEADBEEF] // CLUT lookup.
MODIFY_FOR_CLUT_CONVERSION:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
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.
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],ax // Write to frame buffer.
inc edi
jnz short 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]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 [pvLastBumpToIntensity],edx
mov [pvLastClut],ebx
lea edi,MODIFY_FOR_TEXTUREPOINTER
mov [edi-4],eax
lea edi,MODIFY_FOR_ANGLETOINTENSITY
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION
mov [edi-4],ebx
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
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.
jmp short INNER_LOOP
ALIGN 16
//-----------------------------------------------------------------------
// Draw pixels.
//
INNER_LOOP:
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
test ebx,0xff000000 // Test color value of pixel.
jz short SKIP_TRANSPARENT // Skip over transparent pixels.
mov eax,ebx // Copy texture value.
sub ebx,[u4LightTheta] // Subtract light theta.
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.
shr eax,24 // Shift color value down.
movzx ebx,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY:
shl ebx,9 // Shift intensity up.
mov ax,word ptr[eax*2 + ebx + 0xDEADBEEF] // CLUT lookup.
MODIFY_FOR_CLUT_CONVERSION:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
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.
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],ax // Write to frame buffer.
inc edi
jnz short INNER_LOOP
jmp short END_OF_SCANLINE
SKIP_TRANSPARENT:
add ecx,ebp // Step the V fraction.
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
sbb ebp,ebp // Get carry from v fractional add.
add esi,ebx // Step the U fraction.
mov eax,[u4TextureTileMask] // Load tiling mask.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Add the integer values from the integer table, and add a possible carry.
and edx,eax // 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 [pvLastBumpToIntensity],edx
mov [pvLastClut],ebx
lea edi,MODIFY_FOR_TEXTUREPOINTER
mov [edi-4],eax
lea edi,MODIFY_FOR_ANGLETOINTENSITY
mov [edi-4],edx
lea edi,MODIFY_FOR_CLUT_CONVERSION
mov [edi-4],ebx
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.
and edx,ebx // Mask for tiling.
mov [pvBaseOfLine],ebp // Save pointer to base of line.
jmp short INNER_LOOP
ALIGN 16
//-----------------------------------------------------------------------
// Draw pixels.
//
INNER_LOOP:
mov ebx,[edx*4 + 0xDEADBEEF] // Read texture value.
MODIFY_FOR_TEXTUREPOINTER:
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load v fraction delta.
mov eax,ebx // Copy texture value.
sub ebx,[u4LightTheta] // Subtract light theta.
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.
shr eax,24 // Shift color value down.
movzx ebx,byte ptr[ebx + 0xDEADBEEF] // Bump map lookup.
MODIFY_FOR_ANGLETOINTENSITY:
shl ebx,9 // Shift intensity up.
mov ax,word ptr[eax*2 + ebx + 0xDEADBEEF] // CLUT lookup.
MODIFY_FOR_CLUT_CONVERSION:
mov ebx,[w2dDeltaTex]CWalk2D.uUFrac // Load u fraction delta.
add esi,ebx // Step the U fraction.
mov ebx,[u4TextureTileMask] // Load tiling mask.
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.
and edx,ebx // Mask for tiling.
mov word ptr[ebp + edi*2],ax // Write to frame buffer.
inc edi
jnz short INNER_LOOP
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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