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dolphin/Source/Core/VideoCommon/Src/PixelShaderGen.cpp
Rodolfo Osvaldo Bogado fc12291806 some fixes to my last commit and .... 
modify shader generator to produce native sm 4.0 code.
eliminate compatibility mode in dx11 so now all shader must work much better.
please test.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5691 8ced0084-cf51-0410-be5f-012b33b47a6e
2010-06-14 14:36:01 +00:00

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// Copyright (C) 2003 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include <stdio.h>
#include <cmath>
#include <assert.h>
#include <locale.h>
#include "Profiler.h"
#include "PixelShaderGen.h"
#include "XFMemory.h" // for texture projection mode
#include "BPMemory.h"
PIXELSHADERUID last_pixel_shader_uid;
// Mash together all the inputs that contribute to the code of a generated pixel shader into
// a unique identifier, basically containing all the bits. Yup, it's a lot ....
// It would likely be a lot more efficient to build this incrementally as the attributes
// are set...
void GetPixelShaderId(PIXELSHADERUID *uid, u32 texturemask, u32 dstAlphaEnable)
{
u32 projtexcoords = 0;
for (u32 i = 0; i < (u32)bpmem.genMode.numtevstages + 1; i++)
{
if (bpmem.tevorders[i/2].getEnable(i & 1))
{
int texcoord = bpmem.tevorders[i / 2].getTexCoord(i & 1);
if (xfregs.texcoords[texcoord].texmtxinfo.projection)
projtexcoords |= 1 << texcoord;
}
}
uid->values[0] = (u32)bpmem.genMode.numtevstages |
((u32)bpmem.genMode.numindstages << 4) |
((u32)bpmem.genMode.numtexgens << 7) |
((u32)dstAlphaEnable << 11) |
((u32)((bpmem.alphaFunc.hex >> 16) & 0xff) << 12) |
(projtexcoords << 20) |
((u32)bpmem.ztex2.op << 28);
uid->values[0] = (uid->values[0] & ~0x0ff00000) | (projtexcoords << 20);
// swap table
for (int i = 0; i < 8; i += 2)
((u8*)&uid->values[1])[i / 2] = (bpmem.tevksel[i].hex & 0xf) | ((bpmem.tevksel[i + 1].hex & 0xf) << 4);
uid->values[2] = texturemask;
u32 enableZTexture = (!bpmem.zcontrol.zcomploc && bpmem.zmode.testenable && bpmem.zmode.updateenable)?1:0;
uid->values[3] = (u32)bpmem.fog.c_proj_fsel.fsel |
((u32)bpmem.fog.c_proj_fsel.proj << 3) |
((u32)enableZTexture << 4);
int hdr = 4;
u32 *pcurvalue = &uid->values[hdr];
for (u32 i = 0; i < (u32)bpmem.genMode.numtevstages + 1; ++i)
{
TevStageCombiner::ColorCombiner &cc = bpmem.combiners[i].colorC;
TevStageCombiner::AlphaCombiner &ac = bpmem.combiners[i].alphaC;
u32 val0 = cc.hex & 0xffffff;
u32 val1 = ac.hex & 0xffffff;
val0 |= bpmem.tevksel[i / 2].getKC(i & 1) << 24;
val1 |= bpmem.tevksel[i / 2].getKA(i & 1) << 24;
pcurvalue[0] = val0;
pcurvalue[1] = val1;
pcurvalue += 2;
}
for (u32 i = 0; i < ((u32)bpmem.genMode.numtevstages+1) / 2; ++i)
{
u32 val0, val1;
if (bpmem.tevorders[i].hex & 0x40)
val0 = bpmem.tevorders[i].hex & 0x3ff;
else
val0 = bpmem.tevorders[i].hex & 0x380;
if (bpmem.tevorders[i].hex & 0x40000)
val1 = (bpmem.tevorders[i].hex & 0x3ff000) >> 12;
else
val1 = (bpmem.tevorders[i].hex & 0x380000) >> 12;
switch (i % 3) {
case 0: pcurvalue[0] = val0|(val1<<10); break;
case 1: pcurvalue[0] |= val0<<20; pcurvalue[1] = val1; pcurvalue++; break;
case 2: pcurvalue[1] |= (val0<<10)|(val1<<20); pcurvalue++; break;
default: PanicAlert("Uknown case for Tev Stages / 2: %08x", (i % 3));
}
}
if ((bpmem.genMode.numtevstages + 1) & 1) { // odd
u32 val0;
if (bpmem.tevorders[bpmem.genMode.numtevstages/2].hex & 0x40)
val0 = bpmem.tevorders[bpmem.genMode.numtevstages/2].hex & 0x3ff;
else
val0 = bpmem.tevorders[bpmem.genMode.numtevstages/2].hex & 0x380;
switch (bpmem.genMode.numtevstages % 3)
{
case 0: pcurvalue[0] = val0; break;
case 1: pcurvalue[0] |= val0 << 20; break;
case 2: pcurvalue[1] |= val0 << 10; pcurvalue++; break;
default: PanicAlert("Uknown case for Tev Stages: %08x", bpmem.genMode.numtevstages % 3);
}
}
if ((bpmem.genMode.numtevstages % 3) != 2)
++pcurvalue;
uid->tevstages = (u32)(pcurvalue - &uid->values[0] - hdr);
for (u32 i = 0; i < bpmem.genMode.numindstages; ++i)
{
u32 val = bpmem.tevind[i].hex & 0x1fffff; // 21 bits
switch (i % 3)
{
case 0: pcurvalue[0] = val; break;
case 1: pcurvalue[0] |= val << 21; pcurvalue[1] = val >> 11; ++pcurvalue; break;
case 2: pcurvalue[0] |= val << 10; ++pcurvalue; break;
default: PanicAlert("Uknown case for Ind Stages: %08x", (i % 3));
}
}
// yeah, well ....
uid->indstages = (u32)(pcurvalue - &uid->values[0] - (hdr - 1) - uid->tevstages);
}
// old tev->pixelshader notes
//
// color for this stage (alpha, color) is given by bpmem.tevorders[0].colorchan0
// konstant for this stage (alpha, color) is given by bpmem.tevksel
// inputs are given by bpmem.combiners[0].colorC.a/b/c/d << could be current chan color
// according to GXTevColorArg table above
// output is given by .outreg
// tevtemp is set according to swapmodetables and
static void WriteStage(char *&p, int n, u32 texture_mask, API_TYPE ApiType);
static void SampleTexture(char *&p, const char *destination, const char *texcoords, const char *texswap, int texmap, u32 texture_mask, API_TYPE ApiType);
// static void WriteAlphaCompare(char *&p, int num, int comp);
static bool WriteAlphaTest(char *&p, API_TYPE ApiType);
static void WriteFog(char *&p);
const float epsilon8bit = 1.0f / 255.0f;
static const char *tevKSelTableC[] = // KCSEL
{
"1.0f,1.0f,1.0f", // 1 = 0x00
"(223.0f/255.0f),(223.0f/255.0f),(223.0f/255.0f)", // 7_8 = 0x01
"(191.0f/255.0f),(191.0f/255.0f),(191.0f/255.0f)", // 3_4 = 0x02
"(159.0f/255.0f),(159.0f/255.0f),(159.0f/255.0f)", // 5_8 = 0x03
"(127.0f/255.0f),(127.0f/255.0f),(127.0f/255.0f)", // 1_2 = 0x04
"(95.0f/255.0f),(95.0f/255.0f),(95.0f/255.0f)", // 3_8 = 0x05
"(63.0f/255.0f),(63.0f/255.0f),(63.0f/255.0f)", // 1_4 = 0x06
"(31.0f/255.0f),(31.0f/255.0f),(31.0f/255.0f)", // 1_8 = 0x07
"ERROR", // 0x08
"ERROR", // 0x09
"ERROR", // 0x0a
"ERROR", // 0x0b
I_KCOLORS"[0].rgb", // K0 = 0x0C
I_KCOLORS"[1].rgb", // K1 = 0x0D
I_KCOLORS"[2].rgb", // K2 = 0x0E
I_KCOLORS"[3].rgb", // K3 = 0x0F
I_KCOLORS"[0].rrr", // K0_R = 0x10
I_KCOLORS"[1].rrr", // K1_R = 0x11
I_KCOLORS"[2].rrr", // K2_R = 0x12
I_KCOLORS"[3].rrr", // K3_R = 0x13
I_KCOLORS"[0].ggg", // K0_G = 0x14
I_KCOLORS"[1].ggg", // K1_G = 0x15
I_KCOLORS"[2].ggg", // K2_G = 0x16
I_KCOLORS"[3].ggg", // K3_G = 0x17
I_KCOLORS"[0].bbb", // K0_B = 0x18
I_KCOLORS"[1].bbb", // K1_B = 0x19
I_KCOLORS"[2].bbb", // K2_B = 0x1A
I_KCOLORS"[3].bbb", // K3_B = 0x1B
I_KCOLORS"[0].aaa", // K0_A = 0x1C
I_KCOLORS"[1].aaa", // K1_A = 0x1D
I_KCOLORS"[2].aaa", // K2_A = 0x1E
I_KCOLORS"[3].aaa", // K3_A = 0x1F
};
static const char *tevKSelTableA[] = // KASEL
{
"1.0f", // 1 = 0x00
"(223.0f/255.0f)",// 7_8 = 0x01
"(191.0f/255.0f)", // 3_4 = 0x02
"(159.0f/255.0f)",// 5_8 = 0x03
"(127.0f/255.0f)", // 1_2 = 0x04
"(95.0f/255.0f)",// 3_8 = 0x05
"(63.0f/255.0f)", // 1_4 = 0x06
"(31.0f/255.0f)",// 1_8 = 0x07
"ERROR", // 0x08
"ERROR", // 0x09
"ERROR", // 0x0a
"ERROR", // 0x0b
"ERROR", // 0x0c
"ERROR", // 0x0d
"ERROR", // 0x0e
"ERROR", // 0x0f
I_KCOLORS"[0].r", // K0_R = 0x10
I_KCOLORS"[1].r", // K1_R = 0x11
I_KCOLORS"[2].r", // K2_R = 0x12
I_KCOLORS"[3].r", // K3_R = 0x13
I_KCOLORS"[0].g", // K0_G = 0x14
I_KCOLORS"[1].g", // K1_G = 0x15
I_KCOLORS"[2].g", // K2_G = 0x16
I_KCOLORS"[3].g", // K3_G = 0x17
I_KCOLORS"[0].b", // K0_B = 0x18
I_KCOLORS"[1].b", // K1_B = 0x19
I_KCOLORS"[2].b", // K2_B = 0x1A
I_KCOLORS"[3].b", // K3_B = 0x1B
I_KCOLORS"[0].a", // K0_A = 0x1C
I_KCOLORS"[1].a", // K1_A = 0x1D
I_KCOLORS"[2].a", // K2_A = 0x1E
I_KCOLORS"[3].a", // K3_A = 0x1F
};
static const char *tevScaleTable[] = // CS
{
"1.0f", // SCALE_1
"2.0f", // SCALE_2
"4.0f", // SCALE_4
"0.5f", // DIVIDE_2
};
static const char *tevBiasTable[] = // TB
{
"", // ZERO,
"+(127.0f/255.0f)", // ADDHALF,
"-(127.0f/255.0f)", // SUBHALF,
"",
};
static const char *tevOpTable[] = { // TEV
"+", // TEVOP_ADD = 0,
"-", // TEVOP_SUB = 1,
};
static const char *tevCInputTable[] = // CC
{
"(prev.rgb)", // CPREV,
"(prev.aaa)", // APREV,
"(c0.rgb)", // C0,
"(c0.aaa)", // A0,
"(c1.rgb)", // C1,
"(c1.aaa)", // A1,
"(c2.rgb)", // C2,
"(c2.aaa)", // A2,
"(textemp.rgb)", // TEXC,
"(textemp.aaa)", // TEXA,
"(rastemp.rgb)", // RASC,
"(rastemp.aaa)", // RASA,
"float3(1.0f,1.0f,1.0f)", // ONE
"float3((127.0f/255.0f),(127.0f/255.0f),(127.0f/255.0f))", // HALF
"(konsttemp.rgb)", //"konsttemp.rgb", // KONST
"float3(0.0f,0.0f,0.0f)", // ZERO
///aded extra values to map clamped values
"(cprev.rgb)", // CPREV,
"(cprev.aaa)", // APREV,
"(cc0.rgb)", // C0,
"(cc0.aaa)", // A0,
"(cc1.rgb)", // C1,
"(cc1.aaa)", // A1,
"(cc2.rgb)", // C2,
"(cc2.aaa)", // A2,
"(textemp.rgb)", // TEXC,
"(textemp.aaa)", // TEXA,
"(rastemp.rgb)", // RASC,
"(rastemp.aaa)", // RASA,
"float3(1.0f,1.0f,1.0f)", // ONE
"float3((127.0f/255.0f),(127.0f/255.0f),(127.0f/255.0f))", // HALF
"(konsttemp.rgb)", //"konsttemp.rgb", // KONST
"float3(0.0f,0.0f,0.0f)", // ZERO
"PADERROR", "PADERROR", "PADERROR", "PADERROR",
};
static const char *tevAInputTable[] = // CA
{
"prev", // APREV,
"c0", // A0,
"c1", // A1,
"c2", // A2,
"textemp", // TEXA,
"rastemp", // RASA,
"konsttemp", // KONST, (hw1 had quarter)
"float4(0.0f,0.0f,0.0f,0.0f)", // ZERO
///aded extra values to map clamped values
"cprev", // APREV,
"cc0", // A0,
"cc1", // A1,
"cc2", // A2,
"textemp", // TEXA,
"rastemp", // RASA,
"konsttemp", // KONST, (hw1 had quarter)
"float4(0.0f,0.0f,0.0f,0.0f)", // ZERO
"PADERROR", "PADERROR", "PADERROR", "PADERROR",
"PADERROR", "PADERROR", "PADERROR", "PADERROR",
};
static const char *tevRasTable[] =
{
"colors_0",
"colors_1",
"ERROR", //2
"ERROR", //3
"ERROR", //4
"alphabump", // use bump alpha
"(alphabump*(255.0f/248.0f))", //normalized
"float4(0.0f,0.0f,0.0f,0.0f)", // zero
};
static const char *alphaRef[2] =
{
I_ALPHA"[0].r",
I_ALPHA"[0].g"
};
//static const char *tevTexFunc[] = { "tex2D", "texRECT" };
static const char *tevCOutputTable[] = { "prev.rgb", "c0.rgb", "c1.rgb", "c2.rgb" };
static const char *tevAOutputTable[] = { "prev.a", "c0.a", "c1.a", "c2.a" };
static const char *tevIndAlphaSel[] = {"", "x", "y", "z"};
//static const char *tevIndAlphaScale[] = {"", "*32","*16","*8"};
static const char *tevIndAlphaScale[] = {"*(248.0f/255.0f)", "*(224.0f/255.0f)","*(240.0f/255.0f)","*(248.0f/255.0f)"};
static const char *tevIndBiasField[] = {"", "x", "y", "xy", "z", "xz", "yz", "xyz"}; // indexed by bias
static const char *tevIndBiasAdd[] = {"-128.0f", "1.0f", "1.0f", "1.0f" }; // indexed by fmt
static const char *tevIndWrapStart[] = {"0.0f", "256.0f", "128.0f", "64.0f", "32.0f", "16.0f", "0.001f" };
static const char *tevIndFmtScale[] = {"255.0f", "31.0f", "15.0f", "7.0f" };
#define WRITE p+=sprintf
static const char *swapColors = "rgba";
static char swapModeTable[4][5];
static char text[16384];
static void BuildSwapModeTable()
{
for (int i = 0; i < 4; i++)
{
swapModeTable[i][0] = swapColors[bpmem.tevksel[i*2].swap1];
swapModeTable[i][1] = swapColors[bpmem.tevksel[i*2].swap2];
swapModeTable[i][2] = swapColors[bpmem.tevksel[i*2+1].swap1];
swapModeTable[i][3] = swapColors[bpmem.tevksel[i*2+1].swap2];
swapModeTable[i][4] = 0;
}
}
const char *GeneratePixelShaderCode(u32 texture_mask, bool dstAlphaEnable, API_TYPE ApiType)
{
setlocale(LC_NUMERIC, "C"); // Reset locale for compilation
text[sizeof(text) - 1] = 0x7C; // canary
DVSTARTPROFILE();
BuildSwapModeTable();
int numStages = bpmem.genMode.numtevstages + 1;
int numTexgen = bpmem.genMode.numtexgens;
char *p = text;
WRITE(p, "//Pixel Shader for TEV stages\n");
WRITE(p, "//%i TEV stages, %i texgens, %i IND stages\n",
numStages, numTexgen, bpmem.genMode.numindstages);
int nIndirectStagesUsed = 0;
if (bpmem.genMode.numindstages > 0)
{
for (int i = 0; i < numStages; ++i)
{
if (bpmem.tevind[i].IsActive() && bpmem.tevind[i].bt < bpmem.genMode.numindstages)
nIndirectStagesUsed |= 1 << bpmem.tevind[i].bt;
}
}
// Declare samplers
if (texture_mask)
{
if (ApiType == API_D3D11)
{
WRITE(p, "sampler ");
}
else if (ApiType == API_D3D9)
{
WRITE(p, "uniform sampler ");
}
else
{
WRITE(p, "uniform samplerRECT ");
}
bool bfirst = true;
for (int i = 0; i < 8; ++i)
{
if (texture_mask & (1<<i))
{
WRITE(p, "%s samp%d : register(s%d)", bfirst?"":",", i, i);
bfirst = false;
}
}
WRITE(p, ";\n");
if(ApiType == API_D3D11)
{
bfirst = true;
WRITE(p, "Texture2D ");
for (int i = 0; i < 8; ++i)
{
if (texture_mask & (1<<i))
{
WRITE(p, "%s Tex%d : register(t%d)", bfirst?"":",", i, i);
bfirst = false;
}
}
WRITE(p, ";\n");
}
}
if (texture_mask != 0xff)
{
if(ApiType != API_D3D11)
{
WRITE(p, "uniform sampler2D ");
}
else
{
WRITE(p, "sampler ");
}
bool bfirst = true;
for (int i = 0; i < 8; ++i)
{
if (!(texture_mask & (1<<i))) {
WRITE(p, "%s samp%d : register(s%d)", bfirst?"":",",i, i);
bfirst = false;
}
}
WRITE(p, ";\n");
if(ApiType == API_D3D11)
{
WRITE(p, "Texture2D ");
bfirst = true;
for (int i = 0; i < 8; ++i)
{
if (!(texture_mask & (1<<i)))
{
WRITE(p, "%s Tex%d : register(t%d)", bfirst?"":",", i, i);
bfirst = false;
}
}
WRITE(p, ";\n");
}
}
WRITE(p, "\n");
WRITE(p, "uniform float4 "I_COLORS"[4] : register(c%d);\n", C_COLORS);
WRITE(p, "uniform float4 "I_KCOLORS"[4] : register(c%d);\n", C_KCOLORS);
WRITE(p, "uniform float4 "I_ALPHA"[1] : register(c%d);\n", C_ALPHA);
WRITE(p, "uniform float4 "I_TEXDIMS"[8] : register(c%d);\n", C_TEXDIMS);
WRITE(p, "uniform float4 "I_ZBIAS"[2] : register(c%d);\n", C_ZBIAS);
WRITE(p, "uniform float4 "I_INDTEXSCALE"[2] : register(c%d);\n", C_INDTEXSCALE);
WRITE(p, "uniform float4 "I_INDTEXMTX"[6] : register(c%d);\n", C_INDTEXMTX);
WRITE(p, "uniform float4 "I_FOG"[2] : register(c%d);\n", C_FOG);
WRITE(p, "void main(\n");
if(ApiType != API_D3D11)
WRITE(p, " out float4 ocol0 : COLOR0,\n");
else
WRITE(p, " out float4 ocol0 : SV_Target,\n");
if(ApiType != API_D3D11)
WRITE(p, " out float depth : DEPTH,\n");
else
WRITE(p, " out float depth : SV_Depth,\n");
if(ApiType != API_D3D11)
WRITE(p, " in float4 rawpos : POSITION,\n");
else
WRITE(p, " in float4 rawpos : SV_Position,\n");
WRITE(p, " in float4 colors_0 : COLOR0,\n");
WRITE(p, " in float4 colors_1 : COLOR1\n");
// compute window position if needed because binding semantic WPOS is not widely supported
if (numTexgen < 7)
{
for (int i = 0; i < numTexgen; ++i)
WRITE(p, ", \n in float3 uv%d : TEXCOORD%d", i, i);
WRITE(p, ", \n in float4 clipPos : TEXCOORD%d", numTexgen);
}
else
{
// wpos is in w of first 4 texcoords
for (int i = 0; i < numTexgen; ++i)
WRITE(p, ", \n in float%d uv%d : TEXCOORD%d", i<4?4:3, i, i);
}
WRITE(p, " ) {\n");
char* pmainstart = p;
WRITE(p, " float4 c0="I_COLORS"[1],c1="I_COLORS"[2],c2="I_COLORS"[3],prev=float4(0.0f,0.0f,0.0f,0.0f),textemp=float4(0.0f,0.0f,0.0f,0.0f),rastemp=float4(0.0f,0.0f,0.0f,0.0f),konsttemp=float4(0.0f,0.0f,0.0f,0.0f);\n"
" float3 comp16 = float3(1.0f,255.0f,0.0f), comp24 = float3(1.0f,255.0f,255.0f*255.0f);\n"
" float4 alphabump=0;\n"
" float3 tevcoord;\n"
" float2 wrappedcoord, tempcoord;\n"
" float4 cc0,cc1,cc2,cprev;\n\n");
// HACK to handle cases where the tex gen is not enabled
if (numTexgen == 0)
{
WRITE(p, "float3 uv0 = float3(0.0f,0.0f,0.0f);\n");
}
else
{
for (int i = 0; i < numTexgen; ++i)
{
// optional perspective divides
if (xfregs.texcoords[i].texmtxinfo.projection == XF_TEXPROJ_STQ)
WRITE(p, "uv%d.xy = uv%d.xy/uv%d.z;\n", i, i, i);
// scale texture coordinates
WRITE(p, "uv%d.xy = uv%d.xy * "I_TEXDIMS"[%d].zw;\n", i, i, i);
}
}
// indirect texture map lookup
for(u32 i = 0; i < bpmem.genMode.numindstages; ++i)
{
if (nIndirectStagesUsed & (1<<i))
{
int texcoord = bpmem.tevindref.getTexCoord(i);
if (texcoord < numTexgen)
WRITE(p, "tempcoord=uv%d.xy * "I_INDTEXSCALE"[%d].%s;\n", texcoord, i/2, (i&1)?"zw":"xy");
else
WRITE(p, "tempcoord=float2(0.0f,0.0f);\n");
char buffer[32];
sprintf(buffer, "float3 indtex%d", i);
SampleTexture(p, buffer, "tempcoord", "abg", bpmem.tevindref.getTexMap(i), texture_mask,ApiType);
}
}
for (int i = 0; i < numStages; i++)
WriteStage(p, i, texture_mask,ApiType); //build the equation for this stage
if(numStages)
{
// The results of the last texenv stage are put onto the screen,
// regardless of the used destination register
WRITE(p, "prev.rgb = %s;\n",tevCOutputTable[bpmem.combiners[numStages-1].colorC.dest]);
WRITE(p, "prev.a = %s;\n",tevAOutputTable[bpmem.combiners[numStages-1].alphaC.dest]);
}
// emulation of unisgned 8 overflow when casting
WRITE(p, "prev = frac(4.0f + prev * (255.0f/256.0f)) * (256.0f/255.0f);\n");
if (!WriteAlphaTest(p, ApiType))
{
// alpha test will always fail, so restart the shader and just make it an empty function
p = pmainstart;
WRITE(p, "ocol0 = 0;\n");
WRITE(p, "depth = 1.f;\n");
WRITE(p, "discard;\n");
if(ApiType != API_D3D11)
WRITE(p, "return;\n");
}
else
{
if (numTexgen >= 7)
WRITE(p, "float4 clipPos = float4(uv0.w, uv1.w, uv2.w, uv3.w);\n");
// the screen space depth value = far z + (clip z / clip w) * z range
WRITE(p, "float zCoord = "I_ZBIAS"[1].x + (clipPos.z / clipPos.w) * "I_ZBIAS"[1].y;\n");
if (bpmem.ztex2.op != ZTEXTURE_DISABLE && !bpmem.zcontrol.zcomploc && bpmem.zmode.testenable && bpmem.zmode.updateenable)
{
// use the texture input of the last texture stage (textemp), hopefully this has been read and is in correct format...
if (bpmem.ztex2.op == ZTEXTURE_ADD)
WRITE(p, "zCoord = dot("I_ZBIAS"[0].xyzw, textemp.xyzw) + "I_ZBIAS"[1].w + zCoord;\n");
else
WRITE(p, "zCoord = dot("I_ZBIAS"[0].xyzw, textemp.xyzw) + "I_ZBIAS"[1].w;\n");
// scale to make result from frac correct
WRITE(p, "zCoord = zCoord * (16777215.0f/16777216.0f);\n");
WRITE(p, "zCoord = frac(zCoord);\n");
WRITE(p, "zCoord = zCoord * (16777216.0f/16777215.0f);\n");
}
WRITE(p, "depth = zCoord;\n");
if (dstAlphaEnable)
WRITE(p, " ocol0 = float4(prev.rgb,"I_ALPHA"[0].a);\n");
else
{
WriteFog(p);
WRITE(p, " ocol0 = prev;\n");
}
}
WRITE(p, "}\n");
if (text[sizeof(text) - 1] != 0x7C)
PanicAlert("PixelShader generator - buffer too small, canary has been eaten!");
setlocale(LC_NUMERIC, ""); // restore locale
return text;
}
//table with the color compare operations
static const char *TEVCMPColorOPTable[16] =
{
"float3(0.0f,0.0f,0.0f)",//0
"float3(0.0f,0.0f,0.0f)",//1
"float3(0.0f,0.0f,0.0f)",//2
"float3(0.0f,0.0f,0.0f)",//3
"float3(0.0f,0.0f,0.0f)",//4
"float3(0.0f,0.0f,0.0f)",//5
"float3(0.0f,0.0f,0.0f)",//6
"float3(0.0f,0.0f,0.0f)",//7
" %s + ((%s.r >= %s.r + (0.25f/255.0f)) ? %s : float3(0.0f,0.0f,0.0f))",//#define TEVCMP_R8_GT 8
" %s + ((abs(%s.r - %s.r) < (0.5f/255.0f)) ? %s : float3(0.0f,0.0f,0.0f))",//#define TEVCMP_R8_EQ 9
" %s + (( dot(%s.rgb, comp16) >= (dot(%s.rgb, comp16) + (0.25f/255.0f))) ? %s : float3(0.0f,0.0f,0.0f))",//#define TEVCMP_GR16_GT 10
" %s + (abs(dot(%s.rgb, comp16) - dot(%s.rgb, comp16)) < (0.5f/255.0f) ? %s : float3(0.0f,0.0f,0.0f))",//#define TEVCMP_GR16_EQ 11
" %s + (( dot(%s.rgb, comp24) >= (dot(%s.rgb, comp24) + (0.25f/255.0f))) ? %s : float3(0.0f,0.0f,0.0f))",//#define TEVCMP_BGR24_GT 12
" %s + (abs(dot(%s.rgb, comp24) - dot(%s.rgb, comp24)) < (0.5f/255.0f) ? %s : float3(0.0f,0.0f,0.0f))",//#define TEVCMP_BGR24_EQ 13
" %s + (max(sign(%s.rgb - %s.rgb - (0.25f/255.0f)),float3(0.0f,0.0f,0.0f)) * %s)",//#define TEVCMP_RGB8_GT 14
" %s + ((float3(1.0f,1.0f,1.0f) - max(sign(abs(%s.rgb - %s.rgb) - (0.5f/255.0f)),float3(0.0f,0.0f,0.0f))) * %s)"//#define TEVCMP_RGB8_EQ 15
};
//table with the alpha compare operations
static const char *TEVCMPAlphaOPTable[16] =
{
"0.0f",//0
"0.0f",//1
"0.0f",//2
"0.0f",//3
"0.0f",//4
"0.0f",//5
"0.0f",//6
"0.0f",//7
" %s.a + ((%s.r >= (%s.r + (0.25f/255.0f))) ? %s.a : 0.0f)",//#define TEVCMP_R8_GT 8
" %s.a + (abs(%s.r - %s.r) < (0.5f/255.0f) ? %s.a : 0.0f)",//#define TEVCMP_R8_EQ 9
" %s.a + ((dot(%s.rgb, comp16) >= (dot(%s.rgb, comp16) + (0.25f/255.0f))) ? %s.a : 0.0f)",//#define TEVCMP_GR16_GT 10
" %s.a + (abs(dot(%s.rgb, comp16) - dot(%s.rgb, comp16)) < (0.5f/255.0f) ? %s.a : 0.0f)",//#define TEVCMP_GR16_EQ 11
" %s.a + ((dot(%s.rgb, comp24) >= (dot(%s.rgb, comp24) + (0.25f/255.0f))) ? %s.a : 0.0f)",//#define TEVCMP_BGR24_GT 12
" %s.a + (abs(dot(%s.rgb, comp24) - dot(%s.rgb, comp24)) < (0.5f/255.0f) ? %s.a : 0.0f)",//#define TEVCMP_BGR24_EQ 13
" %s.a + ((%s.a >= (%s.a + (0.25f/255.0f))) ? %s.a : 0.0f)",//#define TEVCMP_A8_GT 14
" %s.a + (abs(%s.a - %s.a) < (0.5f/255.0f) ? %s.a : 0.0f)"//#define TEVCMP_A8_EQ 15
};
static void WriteStage(char *&p, int n, u32 texture_mask, API_TYPE ApiType)
{
char *rasswap = swapModeTable[bpmem.combiners[n].alphaC.rswap];
char *texswap = swapModeTable[bpmem.combiners[n].alphaC.tswap];
int texcoord = bpmem.tevorders[n/2].getTexCoord(n&1);
bool bHasTexCoord = (u32)texcoord < bpmem.genMode.numtexgens;
bool bHasIndStage = bpmem.tevind[n].IsActive() && bpmem.tevind[n].bt < bpmem.genMode.numindstages;
// HACK to handle cases where the tex gen is not enabled
if (!bHasTexCoord)
texcoord = 0;
if (bHasIndStage)
{
// perform the indirect op on the incoming regular coordinates using indtex%d as the offset coords
if (bpmem.tevind[n].bs != ITBA_OFF)
{
WRITE(p, "alphabump = indtex%d.%s %s;\n",
bpmem.tevind[n].bt,
tevIndAlphaSel[bpmem.tevind[n].bs],
tevIndAlphaScale[bpmem.tevind[n].fmt]);
}
// format
WRITE(p, "float3 indtevcrd%d = indtex%d * %s;\n", n, bpmem.tevind[n].bt, tevIndFmtScale[bpmem.tevind[n].fmt]);
// bias
if (bpmem.tevind[n].bias != ITB_NONE )
WRITE(p, "indtevcrd%d.%s += %s;\n", n, tevIndBiasField[bpmem.tevind[n].bias], tevIndBiasAdd[bpmem.tevind[n].fmt]);
// multiply by offset matrix and scale
if (bpmem.tevind[n].mid != 0)
{
if (bpmem.tevind[n].mid <= 3)
{
int mtxidx = 2*(bpmem.tevind[n].mid-1);
WRITE(p, "float2 indtevtrans%d = float2(dot("I_INDTEXMTX"[%d].xyz, indtevcrd%d), dot("I_INDTEXMTX"[%d].xyz, indtevcrd%d));\n",
n, mtxidx, n, mtxidx+1, n);
}
else if (bpmem.tevind[n].mid <= 7 && bHasTexCoord)
{ // s matrix
int mtxidx = 2*(bpmem.tevind[n].mid-5);
WRITE(p, "float2 indtevtrans%d = "I_INDTEXMTX"[%d].ww * uv%d.xy * indtevcrd%d.xx;\n", n, mtxidx, texcoord, n);
}
else if (bpmem.tevind[n].mid <= 11 && bHasTexCoord)
{ // t matrix
int mtxidx = 2*(bpmem.tevind[n].mid-9);
WRITE(p, "float2 indtevtrans%d = "I_INDTEXMTX"[%d].ww * uv%d.xy * indtevcrd%d.yy;\n", n, mtxidx, texcoord, n);
}
else
WRITE(p, "float2 indtevtrans%d = 0;\n", n);
}
else
WRITE(p, "float2 indtevtrans%d = 0;\n", n);
// ---------
// Wrapping
// ---------
// wrap S
if (bpmem.tevind[n].sw == ITW_OFF)
WRITE(p, "wrappedcoord.x = uv%d.x;\n", texcoord);
else if (bpmem.tevind[n].sw == ITW_0)
WRITE(p, "wrappedcoord.x = 0.0f;\n");
else
WRITE(p, "wrappedcoord.x = fmod( uv%d.x, %s );\n", texcoord, tevIndWrapStart[bpmem.tevind[n].sw]);
// wrap T
if (bpmem.tevind[n].tw == ITW_OFF)
WRITE(p, "wrappedcoord.y = uv%d.y;\n", texcoord);
else if (bpmem.tevind[n].tw == ITW_0)
WRITE(p, "wrappedcoord.y = 0.0f;\n");
else
WRITE(p, "wrappedcoord.y = fmod( uv%d.y, %s );\n", texcoord, tevIndWrapStart[bpmem.tevind[n].tw]);
if (bpmem.tevind[n].fb_addprev) // add previous tevcoord
WRITE(p, "tevcoord.xy += wrappedcoord + indtevtrans%d;\n", n);
else
WRITE(p, "tevcoord.xy = wrappedcoord + indtevtrans%d;\n", n);
}
WRITE(p, "rastemp=%s.%s;\n", tevRasTable[bpmem.tevorders[n / 2].getColorChan(n & 1)],rasswap);
if (bpmem.tevorders[n/2].getEnable(n&1))
{
int texmap = bpmem.tevorders[n/2].getTexMap(n&1);
if(!bHasIndStage)
{
// calc tevcord
if(bHasTexCoord)
WRITE(p, "tevcoord.xy = uv%d.xy;\n", texcoord);
else
WRITE(p, "tevcoord.xy = float2(0.0f,0.0f);\n");
}
SampleTexture(p, "textemp", "tevcoord", texswap, texmap, texture_mask, ApiType);
}
else
WRITE(p, "textemp=float4(1.0f,1.0f,1.0f,1.0f);\n");
int kc = bpmem.tevksel[n / 2].getKC(n & 1);
int ka = bpmem.tevksel[n / 2].getKA(n & 1);
TevStageCombiner::ColorCombiner &cc = bpmem.combiners[n].colorC;
TevStageCombiner::AlphaCombiner &ac = bpmem.combiners[n].alphaC;
bool bCKonst = cc.a == TEVCOLORARG_KONST || cc.b == TEVCOLORARG_KONST || cc.c == TEVCOLORARG_KONST || cc.d == TEVCOLORARG_KONST;
bool bAKonst = ac.a == TEVALPHAARG_KONST || ac.b == TEVALPHAARG_KONST || ac.c == TEVALPHAARG_KONST || ac.d == TEVALPHAARG_KONST;
if (bCKonst || bAKonst )
WRITE(p, "konsttemp=float4(%s,%s);\n",tevKSelTableC[kc],tevKSelTableA[ka]);
if(cc.a == TEVCOLORARG_CPREV
|| cc.a == TEVCOLORARG_APREV
|| cc.b == TEVCOLORARG_CPREV
|| cc.b == TEVCOLORARG_APREV
|| cc.c == TEVCOLORARG_CPREV
|| cc.c == TEVCOLORARG_APREV
|| ac.a == TEVALPHAARG_APREV
|| ac.b == TEVALPHAARG_APREV
|| ac.c == TEVALPHAARG_APREV)
WRITE(p, "cprev = frac(4.0f + prev * (255.0f/256.0f)) * (256.0f/255.0f);\n");
if(cc.a == TEVCOLORARG_C0
|| cc.a == TEVCOLORARG_A0
|| cc.b == TEVCOLORARG_C0
|| cc.b == TEVCOLORARG_A0
|| cc.c == TEVCOLORARG_C0
|| cc.c == TEVCOLORARG_A0
|| ac.a == TEVALPHAARG_A0
|| ac.b == TEVALPHAARG_A0
|| ac.c == TEVALPHAARG_A0)
WRITE(p, "cc0 = frac(4.0f + c0 * (255.0f/256.0f)) * (256.0f/255.0f);\n");
if(cc.a == TEVCOLORARG_C1
|| cc.a == TEVCOLORARG_A1
|| cc.b == TEVCOLORARG_C1
|| cc.b == TEVCOLORARG_A1
|| cc.c == TEVCOLORARG_C1
|| cc.c == TEVCOLORARG_A1
|| ac.a == TEVALPHAARG_A1
|| ac.b == TEVALPHAARG_A1
|| ac.c == TEVALPHAARG_A1)
WRITE(p, "cc1 = frac(4.0f + c1 * (255.0f/256.0f)) * (256.0f/255.0f);\n");
if(cc.a == TEVCOLORARG_C2
|| cc.a == TEVCOLORARG_A2
|| cc.b == TEVCOLORARG_C2
|| cc.b == TEVCOLORARG_A2
|| cc.c == TEVCOLORARG_C2
|| cc.c == TEVCOLORARG_A2
|| ac.a == TEVALPHAARG_A2
|| ac.b == TEVALPHAARG_A2
|| ac.c == TEVALPHAARG_A2)
WRITE(p, "cc2 = frac(4.0f + c2 * (255.0f/256.0f)) * (256.0f/255.0f);\n");
if (cc.clamp)
WRITE(p, "%s=saturate(", tevCOutputTable[cc.dest]);
else
WRITE(p, "%s=", tevCOutputTable[cc.dest]);
// combine the color channel
if (cc.bias != TevBias_COMPARE) // if not compare
{
//normal color combiner goes here
if (cc.shift > TEVSCALE_1)
WRITE(p, "%s*(",tevScaleTable[cc.shift]);
if(!(cc.d == TEVCOLORARG_ZERO && cc.op == TEVOP_ADD))
WRITE(p, "%s%s",tevCInputTable[cc.d],tevOpTable[cc.op]);
if (cc.a == cc.b)
WRITE(p,"%s",tevCInputTable[cc.a + 16]);
else if (cc.c == TEVCOLORARG_ZERO)
WRITE(p,"%s",tevCInputTable[cc.a + 16]);
else if (cc.c == TEVCOLORARG_ONE)
WRITE(p,"%s",tevCInputTable[cc.b + 16]);
else if (cc.a == TEVCOLORARG_ZERO)
WRITE(p,"%s*%s",tevCInputTable[cc.b + 16],tevCInputTable[cc.c + 16]);
else if (cc.b == TEVCOLORARG_ZERO)
WRITE(p,"%s*(float3(1.0f,1.0f,1.0f)-%s)",tevCInputTable[cc.a + 16],tevCInputTable[cc.c + 16]);
else
WRITE(p, "lerp(%s,%s,%s)",tevCInputTable[cc.a + 16], tevCInputTable[cc.b + 16],tevCInputTable[cc.c + 16]);
WRITE(p, "%s",tevBiasTable[cc.bias]);
if(cc.shift>0)
WRITE(p, ")");
}
else
{
int cmp = (cc.shift<<1)|cc.op|8; // comparemode stored here
WRITE(p, TEVCMPColorOPTable[cmp],//lookup the function from the op table
tevCInputTable[cc.d],
tevCInputTable[cc.a + 16],
tevCInputTable[cc.b + 16],
tevCInputTable[cc.c + 16]);
}
if (cc.clamp)
WRITE(p,")");
WRITE(p,";\n");
// combine the alpha channel
if (ac.clamp)
WRITE(p, "%s=saturate(", tevAOutputTable[ac.dest]);
else
WRITE(p, "%s=", tevAOutputTable[ac.dest]);
if (ac.bias != TevBias_COMPARE) // if not compare
{
//normal alpha combiner goes here
if (ac.shift > TEVSCALE_1)
WRITE(p, "%s*(",tevScaleTable[ac.shift]);
if(!(ac.d == TEVALPHAARG_ZERO && ac.op == TEVOP_ADD))
WRITE(p, "%s.a%s",tevAInputTable[ac.d],tevOpTable[ac.op]);
if (ac.a == ac.b)
WRITE(p,"%s.a",tevAInputTable[ac.a + 8]);
else if (ac.c == TEVALPHAARG_ZERO)
WRITE(p,"%s.a",tevAInputTable[ac.a + 8]);
else if (ac.a == TEVALPHAARG_ZERO)
WRITE(p,"%s.a*%s.a",tevAInputTable[ac.b + 8],tevAInputTable[ac.c + 8]);
else if (ac.b == TEVALPHAARG_ZERO)
WRITE(p,"%s.a*(1.0f-%s.a)",tevAInputTable[ac.a + 8],tevAInputTable[ac.c + 8]);
else
WRITE(p, "lerp(%s.a,%s.a,%s.a)",tevAInputTable[ac.a + 8],tevAInputTable[ac.b + 8],tevAInputTable[ac.c + 8]);
WRITE(p, "%s",tevBiasTable[ac.bias]);
if (ac.shift>0)
WRITE(p, ")");
}
else
{
//compare alpha combiner goes here
int cmp = (ac.shift<<1)|ac.op|8; // comparemode stored here
WRITE(p, TEVCMPAlphaOPTable[cmp],
tevAInputTable[ac.d],
tevAInputTable[ac.a + 8],
tevAInputTable[ac.b + 8],
tevAInputTable[ac.c + 8]);
}
if (ac.clamp)
WRITE(p, ")");
WRITE(p, ";\n\n");
}
void SampleTexture(char *&p, const char *destination, const char *texcoords, const char *texswap, int texmap, u32 texture_mask, API_TYPE ApiType)
{
if (texture_mask & (1<<texmap)) {
// non pow 2
bool bwraps = (texture_mask & (0x100<<texmap)) ? true : false;
bool bwrapt = (texture_mask & (0x10000<<texmap)) ? true : false;
if (bwraps || bwrapt) {
if (bwraps) {
WRITE(p, "tempcoord.x = fmod(%s.x, "I_TEXDIMS"[%d].x);\n", texcoords, texmap);
}
else {
WRITE(p, "tempcoord.x = %s.x;\n", texcoords);
}
if (bwrapt) {
WRITE(p, "tempcoord.y = fmod(%s.y, "I_TEXDIMS"[%d].y);\n", texcoords, texmap);
}
else {
WRITE(p, "tempcoord.y = %s.y;\n", texcoords);
}
if (ApiType == API_D3D11)
WRITE(p, "%s= Tex%d.Sample(samp%d,tempcoord.xy).%s;\n", destination, texmap,texmap, texswap);
else if (ApiType == API_D3D9)
WRITE(p, "%s=tex2D(samp%d,tempcoord.xy).%s;\n", destination, texmap, texswap);
else
WRITE(p, "%s=texRECT(samp%d,tempcoord.xy).%s;\n", destination, texmap, texswap);
}
else {
if (ApiType == API_D3D11)
WRITE(p, "%s=Tex%d.Sample(samp%d,%s.xy).%s;\n", destination,texmap,texmap, texcoords, texswap);
else if (ApiType == API_D3D9)
WRITE(p, "%s=tex2D(samp%d,%s.xy).%s;\n", destination, texmap, texcoords, texswap);
else
WRITE(p, "%s=texRECT(samp%d,%s.xy).%s;\n", destination, texmap, texcoords, texswap);
}
}
else {
if (ApiType == API_D3D11)
WRITE(p, "%s=Tex%d.Sample(samp%d,%s.xy * "I_TEXDIMS"[%d].xy).%s;\n", destination, texmap,texmap, texcoords, texmap, texswap);
else
WRITE(p, "%s=tex2D(samp%d,%s.xy * "I_TEXDIMS"[%d].xy).%s;\n", destination, texmap, texcoords, texmap, texswap);
}
}
static const char *tevAlphaFuncsTable[] =
{
"(false)", //ALPHACMP_NEVER 0
"(prev.a <= %s - (0.25f/255.0f))", //ALPHACMP_LESS 1
"(abs( prev.a - %s ) < (0.5f/255.0f))", //ALPHACMP_EQUAL 2
"(prev.a < %s + (0.25f/255.0f))", //ALPHACMP_LEQUAL 3
"(prev.a >= %s + (0.25f/255.0f))", //ALPHACMP_GREATER 4
"(abs( prev.a - %s ) >= (0.5f/255.0f))", //ALPHACMP_NEQUAL 5
"(prev.a > %s - (0.25f/255.0f))", //ALPHACMP_GEQUAL 6
"(true)" //ALPHACMP_ALWAYS 7
};
static const char *tevAlphaFunclogicTable[] =
{
" && ", // and
" || ", // or
" != ", // xor
" == " // xnor
};
static bool WriteAlphaTest(char *&p, API_TYPE ApiType)
{
u32 op = bpmem.alphaFunc.logic;
u32 comp[2] = {bpmem.alphaFunc.comp0,bpmem.alphaFunc.comp1};
//first kill all the simple cases
switch(op)
{
case 0: // AND
if (comp[0] == ALPHACMP_ALWAYS && comp[1] == ALPHACMP_ALWAYS) return true;
if (comp[0] == ALPHACMP_NEVER || comp[1] == ALPHACMP_NEVER) return false;
break;
case 1: // OR
if (comp[0] == ALPHACMP_ALWAYS || comp[1] == ALPHACMP_ALWAYS) return true;
if (comp[0] == ALPHACMP_NEVER && comp[1] == ALPHACMP_NEVER)return false;
break;
case 2: // XOR
if ((comp[0] == ALPHACMP_ALWAYS && comp[1] == ALPHACMP_NEVER) || (comp[0] == ALPHACMP_NEVER && comp[1] == ALPHACMP_ALWAYS))
return true;
if ((comp[0] == ALPHACMP_ALWAYS && comp[1] == ALPHACMP_ALWAYS) || (comp[0] == ALPHACMP_NEVER && comp[1] == ALPHACMP_NEVER))
return false;
break;
case 3: // XNOR
if ((comp[0] == ALPHACMP_ALWAYS && comp[1] == ALPHACMP_NEVER) || (comp[0] == ALPHACMP_NEVER && comp[1] == ALPHACMP_ALWAYS))
return false;
if ((comp[0] == ALPHACMP_ALWAYS && comp[1] == ALPHACMP_ALWAYS) || (comp[0] == ALPHACMP_NEVER && comp[1] == ALPHACMP_NEVER))
return true;
break;
default: PanicAlert("bad logic for alpha test? %08x", op);
}
// using discard then return works the same in cg and dx9 but not in dx11
WRITE(p, "if(!( ");
int compindex = bpmem.alphaFunc.comp0 % 8;
WRITE(p, tevAlphaFuncsTable[compindex],alphaRef[0]);//lookup the first component from the alpha function table
WRITE(p, "%s", tevAlphaFunclogicTable[bpmem.alphaFunc.logic % 4]);//lookup the logic op
compindex = bpmem.alphaFunc.comp1 % 8;
WRITE(p, tevAlphaFuncsTable[compindex],alphaRef[1]);//lookup the second component from the alpha function table
WRITE(p, ")){ocol0 = 0;depth = 1.f;discard;%s}\n",(ApiType != API_D3D11)? "return;" : "");
return true;
}
static const char *tevFogFuncsTable[] =
{
"", //No Fog
"", //?
"", //Linear
"", //?
" fog = 1.0f - pow(2, -8.0f * fog);\n", //exp
" fog = 1.0f - pow(2, -8.0f * fog * fog);\n", //exp2
" fog = pow(2, -8.0f * (1.0f - fog));\n", //backward exp
" fog = 1.0f - fog;\n fog = pow(2, -8.0f * fog * fog);\n" //backward exp2
};
static void WriteFog(char *&p)
{
if(bpmem.fog.c_proj_fsel.fsel == 0)return;//no Fog
if (bpmem.fog.c_proj_fsel.proj == 0)
{
// perspective
// ze = A/(B - Zs)
WRITE (p, " float ze = "I_FOG"[1].x / ("I_FOG"[1].y - depth);\n");
}
else
{
// orthographic
// ze = a*Zs
WRITE (p, " float ze = "I_FOG"[1].x * depth;\n");
}
WRITE (p, " float fog = saturate(ze - "I_FOG"[1].z);\n");
if(bpmem.fog.c_proj_fsel.fsel > 3)
{
WRITE(p, "%s", tevFogFuncsTable[bpmem.fog.c_proj_fsel.fsel]);
}
else
{
if(bpmem.fog.c_proj_fsel.fsel != 2)
WARN_LOG(VIDEO, "Unknown Fog Type! %08x", bpmem.fog.c_proj_fsel.fsel);
}
WRITE(p, " prev.rgb = lerp(prev.rgb,"I_FOG"[0].rgb,fog);\n");
}
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