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

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/***********************************************************************************************
*
* Copyright © DreamWorks Interactive, 1997.
*
* Contents:
* Specialized (non-template) versions of the DrawSubtriangle function for terrain.
* Optimized for the Pentium Pro Processor
*
***********************************************************************************************
*
* $Log:: /JP2_PC/Source/Lib/Renderer/Primitives/P6/DrawSubTriangleTerrain.cpp $
*
* 5 98.08.13 4:26p Mmouni
* Changes for VC++ 5.0sp3 compatibility.
*
* 4 98.04.08 8:42p Mmouni
* Added fogged dithered flat shaded primitive.
*
* 3 97/12/03 12:33p Pkeet
* Fixed error in setting up CLUT pointer.
*
* 2 97.12.01 4:26p Mmouni
* P6 optimized version created from P5 optimized version.
*
* 1 11/16/97 3:55a Rwycko
* Copied from P5 primitive.
*
* 3 97.11.11 9:48p Mmouni
* Optimized for Pentium.
*
* 2 97.11.07 5:44p Mmouni
* Added dithering support.
*
* 1 97/11/06 4:48p Pkeet
* Initial implementation.
*
**********************************************************************************************/
#include "Common.hpp"
#include "Lib/View/Raster.hpp"
#include "Lib/Renderer/Fog.hpp"
#include "Lib/Renderer/LightBlend.hpp"
#include "Lib/Renderer/Primitives/DrawTriangle.hpp"
//
// The number of integral bits of the fog shading values.
//
#define LOG2_NUM_SHADES 3
//
// The mask for the combined screen y, screen x, shade value.
//
#define SY_SX_SHADE_MASK ((0x360000 << LOG2_NUM_SHADES) | (0x7FFFFFFF >> (15-LOG2_NUM_SHADES)))
#if (DITHER_SIZE == 4)
//*****************************************************************************************
//
// Dithered, alpha-fogged, perspective texture.
//
// Notes:
// The inner loop keeps both the current intensity and 2 bits of the current screen x
// and curren screen y value in one register. The contents of the register are layed
// out as follows: 0000000YY0XX0SSSFFFFFFFFFFFFFFFF. Where YY is the lower two bits
// of the current screen y, XX is the lower 2 bits of the current x, SSS is the
// integral part of the shading value (more bits would be used for more than 8 shades),
// and the F's are the fractional part of the shading values.
//
void DrawSubtriangle(TGFogPersp* pscan, CDrawPolygon<TGFogPersp>* pdtri)
{
typedef TGFogPersp::TPixel prevent_internal_compiler_errors;
static void* pvLastClut = 0;
static void* pvLastTexture = 0;
static void* pvLastDither = 0;
static fixed DeltaXIntensityAndX;
fixed fx_inc;
fixed fx_diff;
fixed fx_gour_inc;
float f_inc_uinvz;
float f_inc_vinvz;
float f_inc_invz;
TGFogPersp* plinc = &pdtri->pedgeBase->lineIncrement;
//
// TGFogPersp with CGouraudOn substitued for CGouraudFog.
// This is necessary so that we can access members of CGouraudOn.
//
typedef CScanline<uint16, CGouraudOn, CTransparencyOff,
CMapTexture<uint16>, CIndexPerspective, CColLookupOff> FakeTGFogPersp;
typedef FakeTGFogPersp::TPixel prevent_internal_compiler_errors2;
__asm
{
//
// Do self modifications.
//
mov ecx,[pvTextureBitmap] // Texture pointer.
lea edx,lbAlphaTerrain.au2Colour // Alpha color to color table.
mov esi,lbAlphaTerrain.au4AlphaRefDither // Intensity to Alpha+Dither table.
mov eax,[pvLastTexture]
mov ebx,[pvLastClut]
mov edi,[pvLastDither]
cmp eax,ecx
jne short DO_MODIFY
cmp ebx,edx
jne short DO_MODIFY
cmp edi,esi
je short DONE_WITH_MODIFY
DO_MODIFY:
mov [pvLastTexture],ecx // Update last texture pointer.
mov [pvLastClut],edx // Update last clut pointer.
mov [pvLastDither],esi // Update last alhpa/dither table pointer.
lea eax,MODIFY_FOR_TEXTURE_POINTER
mov [eax-4],ecx
lea eax,MODIFY_FOR_ALPHA_DITHER
mov [eax-4],esi
lea eax,MODIFY_FOR_CLUT_POINTER
mov [eax-4],edx
DONE_WITH_MODIFY:
//
// Local copies of edge stepping values.
//
// fx_inc = pdtri->pedgeBase->lineIncrement.fxX;
// fx_diff = pdtri->pedgeBase->lineIncrement.fxXDifference;
// fx_gour_inc = pdtri->pedgeBase->lineIncrement.gourIntensity.fxIntensity;
// 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]TGFogPersp.fxX
mov edx,[eax]TGFogPersp.fxXDifference
mov fx_inc,ebx
mov fx_diff,edx
mov ebx,[eax]TGFogPersp.indCoord.fUInvZ
mov edx,[eax]TGFogPersp.indCoord.fVInvZ
mov f_inc_uinvz,ebx
mov f_inc_vinvz,edx
mov ebx,[eax]TGFogPersp.indCoord.fInvZ
mov edi,[fxDeltaXIntensity]
mov edx,[eax]FakeTGFogPersp.gourIntensity.fxIntensity.i4Fx
and edi,(0x7fffffff >> (15 - LOG2_NUM_SHADES)) // Mask negative values.
mov f_inc_invz,ebx
add edi,(1 << (LOG2_NUM_SHADES+17)) // The low bit of screen x.
mov fx_gour_inc,edx
mov [DeltaXIntensityAndX],edi
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
mov eax,[esi]CDrawPolygonBase.iY // Get current integer y.
mov ebx,[ecx]TGFogPersp.fxX.i4Fx // Get current fixed point x.
shl ebx,(LOG2_NUM_SHADES+1) // Shift low 2 bits of x into position.
and eax,3 // Mask low 2 bits of y.
shl eax,(20 + LOG2_NUM_SHADES) // Shift low 2 bits of y into position.
and ebx,(3 << (17+LOG2_NUM_SHADES)) // Mask shifted low 2 bits of x.
mov edi,[ecx]FakeTGFogPersp.gourIntensity.fxIntensity.i4Fx
or eax,ebx // Combine low bits of x and y.
or edi,eax // Combine low bits of x and y with intensity.
push ebp // Save base pointer.
mov [fxIntensityTemp],edi // Set the starting fog shading value.
mov eax,[esi]CDrawPolygonBase.iY // Load current integer y.
// Check to see if we should skip this scanline.
and eax,[bEvenScanlinesOnly]
jnz END_OF_SCANLINE
// Setup for prespective correction and looping.
PERSPECTIVE_SCANLINE_PROLOGUE_CLAMP(TGFogPersp)
//
// 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.
lea ebp,[ebp+ebx*2] // Base of span in ebp.
mov ebx,[fxIntensityTemp] // Load intensity value.
mov [pvBaseOfLine],ebp // Keep pointer to base of span.
jmp short INNER_LOOP
ALIGN 16
//-----------------------------------------------------------------------
// Draw pixels.
//
INNER_LOOP:
mov ebp,ebx // Copy shade/screen x,y value.
movzx eax,word ptr[edx*2 + 0xDEADBEEF] // Read texture value
MODIFY_FOR_TEXTURE_POINTER:
shr ebp,12 // Only leave 4 fractional bits.
and eax,[u4TerrainFogMask] // Apply fog alhpa mask.
mov ebp,[ebp*4 + 0xDEADBEEF] // Lookup for dither & shade.
MODIFY_FOR_ALPHA_DITHER:
or eax,ebp // Combine color with alpha value.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load V fraction step.
add ecx,ebp // Step V fraction.
sbb ebp,ebp // Get borrow from V fraction step.
mov ax,[eax*2 + 0xDEADBEEF] // Do CLUT lookup (low).
MODIFY_FOR_CLUT_POINTER:
add ebx,[DeltaXIntensityAndX] // Step intensity & screen x.
and ebx,SY_SX_SHADE_MASK // Mask off screen x and screen y carry.
add esi,[w2dDeltaTex]CWalk2D.uUFrac // Step U fraction.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Integer step plus U frac. carry.
mov ebp,[pvBaseOfLine] // Load pointer to destination.
mov [ebp + edi*2],ax // Store pixel.
inc edi // Increment index & count.
jnz short INNER_LOOP // Loop.
// See if there are any pixels left.
mov [fxIntensityTemp],ebx // Save intensity value.
mov eax,[i_pixel]
cmp eax,0
jz END_OF_SCANLINE
// Do perspective correction and looping.
PERSPECTIVE_SCANLINE_EPILOGUE_CLAMP
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]TGFogPersp.fxX.i4Fx
mov ebx,[ecx]TGFogPersp.fxXDifference.i4Fx
fld [ecx]TGFogPersp.indCoord.fUInvZ
fadd [f_inc_uinvz]
fld [ecx]TGFogPersp.indCoord.fVInvZ
fadd [f_inc_vinvz]
fld [ecx]TGFogPersp.indCoord.fInvZ
fadd [f_inc_invz]
mov edx,[ecx]FakeTGFogPersp.gourIntensity.fxIntensity.i4Fx
mov edi,[fx_diff]
add edx,[fx_gour_inc]
add eax,[fx_inc]
add ebx,edi
jge short NO_UNDERFLOW
// Underflow.
add ebx,0x00010000
mov edi,[fxIModDiv]
add edx,edi
jmp short BORROW_OR_CARRY
NO_UNDERFLOW:
cmp ebx,0x00010000
jl short NO_OVERFLOW
// Overflow.
sub ebx,0x00010000
mov edi,[fxIModDiv]
add edx,edi
jmp short BORROW_OR_CARRY
NO_OVERFLOW:
fstp [ecx]TGFogPersp.indCoord.fInvZ
fstp [ecx]TGFogPersp.indCoord.fVInvZ
fstp [ecx]TGFogPersp.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
// Stall (1)
fstp [ecx]TGFogPersp.indCoord.fInvZ
fstp [ecx]TGFogPersp.indCoord.fUInvZ
fstp [ecx]TGFogPersp.indCoord.fVInvZ
FINISH_LOOPING:
// Save values and Y Loop control.
mov [ecx]FakeTGFogPersp.gourIntensity.fxIntensity.i4Fx,edx
mov [ecx]TGFogPersp.fxX.i4Fx,eax
mov edx,[esi]CDrawPolygonBase.iY
mov [ecx]TGFogPersp.fxXDifference.i4Fx,ebx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
}
}
//*****************************************************************************************
//
// Dithered, alpha-fogged, linear texture.
//
void DrawSubtriangle(TGFogLinear* pscan, CDrawPolygon<TGFogLinear>* pdtri)
{
typedef TGFogLinear::TPixel prevent_internal_compiler_errors;
static void* pvLastClut = 0;
static void* pvLastTexture = 0;
static void* pvLastDither = 0;
static fixed DeltaXIntensityAndX;
static CDrawPolygon<TGFogLinear>* pdtriGlbl;
static TGFogLinear* pscanGlbl;
static fixed fx_gour_inc;
TGFogLinear* plinc = &pdtri->pedgeBase->lineIncrement;
//
// TGFogLinear with CGouraudOn substitued for CGouraudFog.
// This is necessary so that we can access members of CGouraudOn.
//
typedef CScanline<uint16, CGouraudOn, CTransparencyOff,
CMapTexture<uint16>, CIndexLinear, CColLookupOff> FakeTGFogLinear;
typedef FakeTGFogLinear::TPixel prevent_internal_compiler_errors2;
__asm
{
//
// Do self modifications.
//
mov ecx,[pvTextureBitmap] // Texture pointer.
lea edx,lbAlphaTerrain.au2Colour // Alpha color to color table.
mov esi,lbAlphaTerrain.au4AlphaRefDither // Intensity to Alpha+Dither table.
mov eax,[pvLastTexture]
mov ebx,[pvLastClut]
mov edi,[pvLastDither]
cmp eax,ecx
jne short DO_MODIFY
cmp ebx,edx
jne short DO_MODIFY
cmp edi,esi
je short DONE_WITH_MODIFY
DO_MODIFY:
mov [pvLastTexture],ecx // Update last texture pointer.
mov [pvLastClut],edx // Update last clut pointer.
mov [pvLastDither],esi // Update last alhpa/dither table pointer.
lea eax,MODIFY_FOR_TEXTURE_POINTER
mov [eax-4],ecx
lea eax,MODIFY_FOR_ALPHA_DITHER
mov [eax-4],esi
lea eax,MODIFY_FOR_CLUT_POINTER
mov [eax-4],edx
DONE_WITH_MODIFY:
mov edi,[plinc] // Pointer to scanline increment.
mov esi,[pdtri] // Pointer to polygon object.
mov eax,[pscan] // Pointer to scanline object.
push ebp // Save ebp.
//
// Local 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;
// pdtriGlbl = pdtri;
// pscanGlbl = pscan;
// fx_gour_inc = pdtri->pedgeBase->lineIncrement.gourIntensity.fxIntensity;
//
mov ebx,[edi]TGFogLinear.fxX
mov ecx,[edi]TGFogLinear.fxXDifference
mov fx_inc,ebx
mov fx_diff,ecx
mov ebx,[edi]TGFogLinear.indCoord.bfU.i4Int
mov ecx,[edi]TGFogLinear.indCoord.bfU.u4Frac
mov bf_u_inc.i4Int,ebx
mov bf_u_inc.u4Frac,ecx
mov ebx,[edi]TGFogLinear.indCoord.w1dV.bfxValue.i4Int
mov ecx,[edi]TGFogLinear.indCoord.w1dV.bfxValue.u4Frac
mov w1d_v_inc.bfxValue.i4Int,ebx
mov w1d_v_inc.bfxValue.u4Frac,ecx
mov pdtriGlbl,esi
mov ecx,[fxDeltaXIntensity]
mov ebx,[edi]FakeTGFogLinear.gourIntensity.fxIntensity.i4Fx
and ecx,(0x7fffffff >> (15 - LOG2_NUM_SHADES)) // Mask negative values.
mov pscanGlbl,eax
add ecx,(1 << (LOG2_NUM_SHADES+17)) // The low bit of screen x.
mov fx_gour_inc,ebx
mov [DeltaXIntensityAndX],ecx
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
mov ebp,[esi]CDrawPolygonBase.iY // Get current integer y.
mov ebx,[eax]FakeTGFogLinear.fxX.i4Fx // Get current fixed point x.
shl ebx,(LOG2_NUM_SHADES+1) // Shift low 2 bits of x into position.
and ebp,3 // Mask low 2 bits of y.
shl ebp,(20 + LOG2_NUM_SHADES) // Shift low 2 bits of y into position.
and ebx,(3 << (17+LOG2_NUM_SHADES)) // Mask shifted low 2 bits of x.
mov edi,[eax]FakeTGFogLinear.gourIntensity.fxIntensity.i4Fx
or ebp,ebx // Combine low bits of x and y.
or edi,ebp // Combine low bits of x and y with intensity.
mov ebx,[bEvenScanlinesOnly]
mov [fxIntensityTemp],edi // Set the starting fog shading value.
mov ebp,[esi]CDrawPolygonBase.iY
// Check for odd scan lines here and skip if even
and ebp,ebx
jnz short END_OF_SCANLINE
mov ebx,[eax]TGFogLinear.fxX.i4Fx
mov ecx,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov edi,ebx
add ebx,ecx
sar ebx,16
mov ecx,[esi]CDrawPolygonBase.iLineStartIndex
sar edi,16
mov ebp,gsGlobals.pvScreen
add ecx,ebx
sub edi,ebx
jge short END_OF_SCANLINE // no pixels to draw
mov esi,[eax]TGFogLinear.indCoord.bfU.u4Frac // UFrac
mov edx,[eax]TGFogLinear.indCoord.w1dV.bfxValue.i4Int
lea ebp,[ebp + ecx*2]
mov ebx,[eax]TGFogLinear.indCoord.bfU.i4Int
add edx,ebx // Add integer steps.
mov ecx,[eax]TGFogLinear.indCoord.w1dV.bfxValue.u4Frac // VFrac
mov ebx,[fxIntensityTemp] // Load intensity value.
mov [pvBaseOfLine],ebp
jmp short INNER_LOOP
ALIGN 16
//-----------------------------------------------------------------------
// Draw pixels.
//
INNER_LOOP:
mov ebp,ebx // Copy shade/screen x,y value.
movzx eax,word ptr[edx*2 + 0xDEADBEEF] // Read texture value
MODIFY_FOR_TEXTURE_POINTER:
shr ebp,12 // Only leave 4 fractional bits.
and eax,[u4TerrainFogMask] // Apply fog alhpa mask.
mov ebp,[ebp*4 + 0xDEADBEEF] // Lookup for dither & shade.
MODIFY_FOR_ALPHA_DITHER:
or eax,ebp // Combine color with alpha value.
mov ebp,[w2dDeltaTex]CWalk2D.uVFrac // Load V fraction step.
add ecx,ebp // Step V fraction.
sbb ebp,ebp // Get borrow from V fraction step.
mov ax,[eax*2 + 0xDEADBEEF] // Do CLUT lookup (low).
MODIFY_FOR_CLUT_POINTER:
add ebx,[DeltaXIntensityAndX] // Step intensity & screen x.
and ebx,SY_SX_SHADE_MASK // Mask off screen x and screen y carry.
add esi,[w2dDeltaTex]CWalk2D.uUFrac // Step U fraction.
adc edx,[w2dDeltaTex+ebp*4+4]CWalk2D.iUVInt // Integer step plus U frac. carry.
mov ebp,[pvBaseOfLine] // Load pointer to destination.
mov [ebp + edi*2],ax // Store pixel.
inc edi // Increment index & count.
jnz short INNER_LOOP // Loop.
// -------------------------------------------------------------------------
// Increment the base edge.
//
END_OF_SCANLINE:
mov eax,[pscanGlbl]
mov ebp,bf_u_inc.i4Int
// AGI on eax.
mov ecx,[eax]TGFogLinear.indCoord.bfU.u4Frac
mov edx,[eax]TGFogLinear.indCoord.bfU.i4Int
mov edi,[eax]TGFogLinear.indCoord.w1dV.bfxValue.i4Int
mov esi,[eax]TGFogLinear.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]TGFogLinear.indCoord.w1dV.iOffsetPerLine
NO_VFRAC_CARRY:
mov ebp,[eax]FakeTGFogLinear.gourIntensity.fxIntensity.i4Fx
mov ebx,[eax]TGFogLinear.fxXDifference
add ebp,[fx_gour_inc]
add ebx,[fx_diff]
jge short NO_UNDERFLOW
// Undeflow of fxXDifference.
add ebx,0x00010000
add edi,w1dNegDV.bfxValue.i4Int
add ecx,bfNegDU.u4Frac
adc edx,bfNegDU.i4Int
add ebp,[fxIModDiv]
add esi,w1dNegDV.bfxValue.u4Frac
jnc short EDGE_DONE
add edi,[eax]TGFogLinear.indCoord.w1dV.iOffsetPerLine
jmp short EDGE_DONE
NO_UNDERFLOW:
cmp ebx,0x00010000
jl short EDGE_DONE
// Overflow of fxXDifference.
sub ebx,0x00010000
add edi,w1dNegDV.bfxValue.i4Int
add ecx,bfNegDU.u4Frac
adc edx,bfNegDU.i4Int
add ebp,[fxIModDiv]
add esi,w1dNegDV.bfxValue.u4Frac
jnc short EDGE_DONE
add edi,[eax]TGFogLinear.indCoord.w1dV.iOffsetPerLine
EDGE_DONE:
// Store modified variables and do looping.
mov [eax]FakeTGFogLinear.gourIntensity.fxIntensity.i4Fx,ebp
mov [eax]TGFogLinear.fxXDifference,ebx
mov [eax]TGFogLinear.indCoord.w1dV.bfxValue.u4Frac,esi
mov [eax]TGFogLinear.indCoord.w1dV.bfxValue.i4Int,edi
mov esi,[pdtriGlbl] // Pointer to polygon object.
mov [eax]TGFogLinear.indCoord.bfU.u4Frac,ecx
mov [eax]TGFogLinear.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]TGFogLinear.fxX
mov ebp,[fx_inc]
add ecx,ebp
mov edx,[esi]CDrawPolygonBase.iY
mov [eax]TGFogLinear.fxX,ecx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
pop ebp
}
}
//*****************************************************************************************
//
// Dithered, alpha-fogged, linear texture.
//
void DrawSubtriangle(TFlatGourFog* pscan, CDrawPolygon<TFlatGourFog>* pdtri)
{
typedef TFlatGourFog::TPixel prevent_internal_compiler_errors;
static void* pvLastClut = 0;
static void* pvLastDither = 0;
static fixed DeltaXIntensityAndX;
static CDrawPolygon<TFlatGourFog>* pdtriGlbl;
static TFlatGourFog* pscanGlbl;
static fixed fx_gour_inc;
static uint32 u4MaskedColor;
TFlatGourFog* plinc = &pdtri->pedgeBase->lineIncrement;
u4MaskedColor = u4ConstColour & u4TerrainFogMask;
//
// TFlatGourFog with CGouraudOn substitued for CGouraudFog.
// This is necessary so that we can access members of CGouraudOn.
//
typedef CScanline<uint16, CGouraudOn, CTransparencyOff, CMapFlat, CIndexNone,
CColLookupOff> FakeTFlatGourFog;
typedef FakeTFlatGourFog::TPixel prevent_internal_compiler_errors2;
__asm
{
//
// Do self modifications.
//
lea edx,lbAlphaTerrain.au2Colour // Alpha color to color table.
mov esi,lbAlphaTerrain.au4AlphaRefDither // Intensity to Alpha+Dither table.
mov ebx,[pvLastClut]
mov edi,[pvLastDither]
cmp ebx,edx
jne short DO_MODIFY
cmp edi,esi
je short DONE_WITH_MODIFY
DO_MODIFY:
mov [pvLastClut],edx // Update last clut pointer.
mov [pvLastDither],esi // Update last alhpa/dither table pointer.
lea eax,MODIFY_FOR_ALPHA_DITHER
mov [eax-4],esi
lea eax,MODIFY_FOR_CLUT_POINTER
mov [eax-4],edx
DONE_WITH_MODIFY:
mov edi,[plinc] // Pointer to scanline increment.
mov esi,[pdtri] // Pointer to polygon object.
mov eax,[pscan] // Pointer to scanline object.
push ebp // Save ebp.
//
// Local copies of edge stepping values.
//
// fx_inc = pdtri->pedgeBase->lineIncrement.fxX;
// fx_diff = pdtri->pedgeBase->lineIncrement.fxXDifference;
// pdtriGlbl = pdtri;
// pscanGlbl = pscan;
// fx_gour_inc = pdtri->pedgeBase->lineIncrement.gourIntensity.fxIntensity;
//
mov ebx,[edi]TGFogLinear.fxX
mov ecx,[edi]TGFogLinear.fxXDifference
mov [fx_inc],ebx
mov [fx_diff],ecx
mov [pdtriGlbl],esi
mov ecx,[fxDeltaXIntensity]
mov ebx,[edi]FakeTFlatGourFog.gourIntensity.fxIntensity.i4Fx
and ecx,(0x7fffffff >> (15 - LOG2_NUM_SHADES)) // Mask negative values.
mov [pscanGlbl],eax
add ecx,(1 << (LOG2_NUM_SHADES+17)) // The low bit of screen x.
mov [fx_gour_inc],ebx
mov [DeltaXIntensityAndX],ecx
//
// Iterate through the scanlines that intersect the subtriangle.
//
Y_LOOP:
mov ebp,[esi]CDrawPolygonBase.iY // Get current integer y.
mov ebx,[eax]FakeTFlatGourFog.fxX.i4Fx // Get current fixed point x.
shl ebx,(LOG2_NUM_SHADES+1) // Shift low 2 bits of x into position.
and ebp,3 // Mask low 2 bits of y.
shl ebp,(20 + LOG2_NUM_SHADES) // Shift low 2 bits of y into position.
and ebx,(3 << (17+LOG2_NUM_SHADES)) // Mask shifted low 2 bits of x.
mov edi,[eax]FakeTFlatGourFog.gourIntensity.fxIntensity.i4Fx
or ebp,ebx // Combine low bits of x and y.
or edi,ebp // Combine low bits of x and y with intensity.
mov ebx,[bEvenScanlinesOnly]
mov [fxIntensityTemp],edi // Set the starting fog shading value.
mov ebp,[esi]CDrawPolygonBase.iY
// Check for odd scan lines here and skip if even
and ebp,ebx
jnz short END_OF_SCANLINE
mov ebx,[eax]TFlatGourFog.fxX.i4Fx
mov ecx,[esi]CDrawPolygonBase.fxLineLength.i4Fx
mov edi,ebx
add ebx,ecx
sar ebx,16
mov ecx,[esi]CDrawPolygonBase.iLineStartIndex
sar edi,16
mov ebp,gsGlobals.pvScreen
add ecx,ebx
sub edi,ebx
jge short END_OF_SCANLINE // no pixels to draw
lea ebp,[ebp + ecx*2] // Calculate destination address.
mov ebx,[fxIntensityTemp] // Load intensity value.
mov esi,ebx // Copy shade/screen x,y value.
mov edx,[u4MaskedColor]
shr esi,12 // Only leave 4 fractional bits.
//-----------------------------------------------------------------------
// Left to right scanline.
ALIGN 16
INNER_LOOP:
add ebx,[DeltaXIntensityAndX] // Step intensity & screen x.
mov eax,edx // Copy masked base color.
or eax,[esi*4 + 0xDEADBEEF] // Or with dithered alpha value.
MODIFY_FOR_ALPHA_DITHER:
and ebx,SY_SX_SHADE_MASK // Mask off screen x and screen y carry.
mov esi,ebx // Copy shade/screen x,y value.
mov cx,[eax*2 + 0xDEADBEEF] // Do CLUT lookup (low).
MODIFY_FOR_CLUT_POINTER:
shr esi,12 // Only leave 4 fractional bits.
mov [ebp + edi*2],cx // Store pixel.
inc edi
jnz INNER_LOOP
// -------------------------------------------------------------------------
// Increment the base edge.
//
END_OF_SCANLINE:
mov eax,[pscanGlbl]
// AGI on eax.
mov ebp,[eax]FakeTFlatGourFog.gourIntensity.fxIntensity.i4Fx
mov ebx,[eax]TFlatGourFog.fxXDifference
add ebp,[fx_gour_inc]
add ebx,[fx_diff]
jge short NO_UNDERFLOW
// Undeflow of fxXDifference.
add ebp,[fxIModDiv]
add ebx,0x00010000
jmp short EDGE_DONE
NO_UNDERFLOW:
cmp ebx,0x00010000
jl short EDGE_DONE
// Overflow of fxXDifference.
add ebp,[fxIModDiv]
sub ebx,0x00010000
EDGE_DONE:
mov esi,[pdtriGlbl]
// Store modified variables and do looping.
mov [eax]FakeTFlatGourFog.gourIntensity.fxIntensity.i4Fx,ebp
mov [eax]TFlatGourFog.fxXDifference,ebx
// 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]TFlatGourFog.fxX
mov ebp,[fx_inc]
add ecx,ebp
mov edx,[esi]CDrawPolygonBase.iY
mov [eax]TGFogLinear.fxX,ecx
inc edx
mov ebx,[esi]CDrawPolygonBase.iYTo
mov [esi]CDrawPolygonBase.iY,edx
cmp edx,ebx
jl Y_LOOP
pop ebp
}
}
#else // if (DITHER_SIZE == 4)
//*********************************************************************************************
//
// Reference C++ implementation.
//
void DrawSubtriangle(TGFogPersp* pscan, CDrawPolygon<TGFogPersp>* pdtri)
{
typedef TGFogPersp::TPixel TDest;
Assert(pscan);
Assert(pdtri);
int i_x_from;
int i_x_to;
int i_screen_index;
int i_pixel;
// Iterate through the scanlines that intersect the subtriangle.
do
{
if (bRIGHT_TO_LEFT)
{
i_x_from = (pscan->fxX.i4Fx - pdtri->fxLineLength.i4Fx) >> 16;
i_x_to = pscan->fxX.i4Fx >> 16;
i_screen_index = pdtri->iLineStartIndex + i_x_from - 1;
i_pixel = i_x_to - i_x_from;
}
else
{
i_x_from = pscan->fxX.i4Fx >> 16;
i_x_to = (pscan->fxX.i4Fx + pdtri->fxLineLength.i4Fx) >> 16;
i_screen_index = pdtri->iLineStartIndex + i_x_to;
i_pixel = i_x_from - i_x_to;
}
// Draw if there are pixels to draw.
if (i_x_to > i_x_from && !(bEvenScanlinesOnly && ((pdtri->iY & 1) == 0)))
{
{
TGFogPersp::TGouraud gour(pscan->gourIntensity);
TGFogPersp::TIndex index(pscan->indCoord, i_pixel);
TDest* apix_screen = ((TDest*)pdtri->prasScreen->pSurface) + i_screen_index;
int i_x = i_x_from;
// Iterate left or right along the destination scanline.
for (;;)
{
// Do next subdivision.
int i_pixel_inner = index.i4StartSubdivision(i_pixel);
TDest* apix_screen_inner = apix_screen + i_pixel;
for (;;)
{
// int32 i4_fog_index = int(gour.fxIntensity);
// Assert(bWithin(i4_fog_index, 0, iNUM_TERRAIN_FOG_BANDS - 1));
uint16 u2_source_pixel = ((uint16*)pvTextureBitmap)[index.iGetIndex()];
++index;
u2_source_pixel &= lbAlphaTerrain.u2GetAlphaMask();
u2_source_pixel |= lbAlphaTerrain.u4GetAlphaRefDither(i_x, pdtri->iY, gour.fxIntensity.i4Fx);
apix_screen_inner[i_pixel_inner] = lbAlphaTerrain.au2Colour[u2_source_pixel];
i_x++;
// Increment values.
i_pixel_inner += i4ScanlineDirection;
// Break from subdivision loop if there are no more pixels to render.
if (i_pixel_inner == 0)
break;
// Increment values.
++gour;
}
// Exit scanline routine if there are no more pixels to render.
if (i_pixel == 0)
break;
// Increment values.
++gour;
// Implement perspective correction.
index.UpdatePerspective(0);
}
}
}
// Increment the base edge.
++*pdtri->pedgeBase;
// Set the new length of the line to be rasterized.
pdtri->fxLineLength.i4Fx += pdtri->fxDeltaLineLength.i4Fx;
// Get new starting pixel TIndex for the scanline.
pdtri->iLineStartIndex += pdtri->prasScreen->iLinePixels;
}
while (++pdtri->iY < pdtri->iYTo);
}
//*********************************************************************************************
void DrawSubtriangle(TGFogLinear* pscan, CDrawPolygon<TGFogLinear>* pdtri)
{
typedef TGFogLinear::TPixel TDest;
Assert(pscan);
Assert(pdtri);
int i_x_from;
int i_x_to;
int i_screen_index;
int i_pixel;
// Iterate through the scanlines that intersect the subtriangle.
do
{
if (bRIGHT_TO_LEFT)
{
i_x_from = (pscan->fxX.i4Fx - pdtri->fxLineLength.i4Fx) >> 16;
i_x_to = pscan->fxX.i4Fx >> 16;
i_screen_index = pdtri->iLineStartIndex + i_x_from - 1;
i_pixel = i_x_to - i_x_from;
}
else
{
i_x_from = pscan->fxX.i4Fx >> 16;
i_x_to = (pscan->fxX.i4Fx + pdtri->fxLineLength.i4Fx) >> 16;
i_screen_index = pdtri->iLineStartIndex + i_x_to;
i_pixel = i_x_from - i_x_to;
}
// Draw if there are pixels to draw.
if (i_x_to > i_x_from && !(bEvenScanlinesOnly && ((pdtri->iY & 1) == 0)))
{
{
TGFogLinear::TGouraud gour(pscan->gourIntensity);
TGFogLinear::TIndex index(pscan->indCoord, i_pixel);
TDest* apix_screen = ((TDest*)pdtri->prasScreen->pSurface) + i_screen_index;
int i_x = i_x_from;
// Iterate left or right along the destination scanline.
for (;;)
{
// Do next subdivision.
int i_pixel_inner = index.i4StartSubdivision(i_pixel);
TDest* apix_screen_inner = apix_screen + i_pixel;
for (;;)
{
// int32 i4_fog_index = int(gour.fxIntensity);
// Assert(bWithin(i4_fog_index, 0, iNUM_TERRAIN_FOG_BANDS - 1));
uint16 u2_source_pixel = ((uint16*)pvTextureBitmap)[index.iGetIndex()];
++index;
u2_source_pixel &= lbAlphaTerrain.u2GetAlphaMask();
u2_source_pixel |= lbAlphaTerrain.u4GetAlphaRefDither(i_x, pdtri->iY, gour.fxIntensity.i4Fx);
apix_screen_inner[i_pixel_inner] = lbAlphaTerrain.au2Colour[u2_source_pixel];
i_x++;
// Increment values.
i_pixel_inner += i4ScanlineDirection;
// Break from subdivision loop if there are no more pixels to render.
if (i_pixel_inner == 0)
break;
// Increment values.
++gour;
}
// Exit scanline routine if there are no more pixels to render.
if (i_pixel == 0)
break;
// Increment values.
++gour;
// Implement perspective correction.
index.UpdatePerspective(0);
}
}
}
// Increment the base edge.
++*pdtri->pedgeBase;
// Set the new length of the line to be rasterized.
pdtri->fxLineLength.i4Fx += pdtri->fxDeltaLineLength.i4Fx;
// Get new starting pixel TIndex for the scanline.
pdtri->iLineStartIndex += pdtri->prasScreen->iLinePixels;
}
while (++pdtri->iY < pdtri->iYTo);
}
//*********************************************************************************************
void DrawSubtriangle(TFlatGourFog* pscan, CDrawPolygon<TFlatGourFog>* pdtri)
{
typedef TFlatGourFog::TPixel TDest;
Assert(pscan);
Assert(pdtri);
int i_x_from;
int i_x_to;
int i_screen_index;
int i_pixel;
// Iterate through the scanlines that intersect the subtriangle.
do
{
i_x_from = pscan->fxX.i4Fx >> 16;
i_x_to = (pscan->fxX.i4Fx + pdtri->fxLineLength.i4Fx) >> 16;
i_screen_index = pdtri->iLineStartIndex + i_x_to;
i_pixel = i_x_from - i_x_to;
// Draw if there are pixels to draw.
if (i_x_to > i_x_from && !(bEvenScanlinesOnly && ((pdtri->iY & 1) == 0)))
{
TFlatGourFog::TGouraud gour(pscan->gourIntensity);
TDest* apix_screen = ((TDest*)pdtri->prasScreen->pSurface) + i_screen_index;
int i_x = i_x_from;
// Iterate left along the destination scanline.
do
{
// int32 i4_fog_index = int(gour.fxIntensity);
// Assert(bWithin(i4_fog_index, 0, iNUM_TERRAIN_FOG_BANDS - 1));
uint16 u2_source_pixel = u4ConstColour;
u2_source_pixel &= lbAlphaTerrain.u2GetAlphaMask();
u2_source_pixel |= lbAlphaTerrain.u4GetAlphaRefDither(i_x, pdtri->iY, gour.fxIntensity.i4Fx);
apix_screen[i_pixel] = lbAlphaTerrain.au2Colour[u2_source_pixel];
i_x++;
// Increment values.
++gour;
}
while (++i_pixel);
}
// Increment the base edge.
++*pdtri->pedgeBase;
// Set the new length of the line to be rasterized.
pdtri->fxLineLength.i4Fx += pdtri->fxDeltaLineLength.i4Fx;
// Get new starting pixel TIndex for the scanline.
pdtri->iLineStartIndex += pdtri->prasScreen->iLinePixels;
}
while (++pdtri->iY < pdtri->iYTo);
}
#endif // else // if (DITHER_SIZE == 4)
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