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ppsspp/GPU/GLES/FragmentShaderGenerator.cpp
Unknown W. Brackets 6e751f8092 Use shader blend for min/max when unsupported.
2014-06-17 00:20:06 -07:00

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// Copyright (c) 2012- PPSSPP 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 or later versions.
// 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 git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
#if !defined(USING_GLES2)
// SDL 1.2 on Apple does not have support for OpenGL 3 and hence needs
// special treatment in the shader generator.
#if defined(__APPLE__)
#define FORCE_OPENGL_2_0
#endif
#endif
#include <cstdio>
#include "gfx_es2/gpu_features.h"
#include "Core/Reporting.h"
#include "Core/Config.h"
#include "GPU/GLES/FragmentShaderGenerator.h"
#include "GPU/GLES/Framebuffer.h"
#include "GPU/ge_constants.h"
#include "GPU/GPUState.h"
#define WRITE p+=sprintf
// #define DEBUG_SHADER
// Dest factors where it's safe to eliminate the alpha test under certain conditions
const bool safeDestFactors[16] = {
true, // GE_DSTBLEND_SRCCOLOR,
true, // GE_DSTBLEND_INVSRCCOLOR,
false, // GE_DSTBLEND_SRCALPHA,
true, // GE_DSTBLEND_INVSRCALPHA,
true, // GE_DSTBLEND_DSTALPHA,
true, // GE_DSTBLEND_INVDSTALPHA,
false, // GE_DSTBLEND_DOUBLESRCALPHA,
false, // GE_DSTBLEND_DOUBLEINVSRCALPHA,
true, // GE_DSTBLEND_DOUBLEDSTALPHA,
true, // GE_DSTBLEND_DOUBLEINVDSTALPHA,
true, //GE_DSTBLEND_FIXB,
};
bool IsAlphaTestTriviallyTrue() {
switch (gstate.getAlphaTestFunction()) {
case GE_COMP_NEVER:
return false;
case GE_COMP_ALWAYS:
return true;
case GE_COMP_GEQUAL:
if (gstate_c.vertexFullAlpha && (gstate_c.textureFullAlpha || !gstate.isTextureAlphaUsed()))
return true; // If alpha is full, it doesn't matter what the ref value is.
return gstate.getAlphaTestRef() == 0;
// Non-zero check. If we have no depth testing (and thus no depth writing), and an alpha func that will result in no change if zero alpha, get rid of the alpha test.
// Speeds up Lumines by a LOT on PowerVR.
case GE_COMP_NOTEQUAL:
if (gstate.getAlphaTestRef() == 255) {
// Likely to be rare. Let's just skip the vertexFullAlpha optimization here instead of adding
// complicated code to discard the draw or whatnot.
return false;
}
// Fallthrough on purpose
case GE_COMP_GREATER:
{
#if 0
// Easy way to check the values in the debugger without ruining && early-out
bool doTextureAlpha = gstate.isTextureAlphaUsed();
bool stencilTest = gstate.isStencilTestEnabled();
bool depthTest = gstate.isDepthTestEnabled();
GEComparison depthTestFunc = gstate.getDepthTestFunction();
int alphaRef = gstate.getAlphaTestRef();
int blendA = gstate.getBlendFuncA();
bool blendEnabled = gstate.isAlphaBlendEnabled();
int blendB = gstate.getBlendFuncA();
#endif
return (gstate_c.vertexFullAlpha && (gstate_c.textureFullAlpha || !gstate.isTextureAlphaUsed())) || (
(!gstate.isStencilTestEnabled() &&
!gstate.isDepthTestEnabled() &&
gstate.getAlphaTestRef() == 0 &&
gstate.isAlphaBlendEnabled() &&
gstate.getBlendFuncA() == GE_SRCBLEND_SRCALPHA &&
safeDestFactors[(int)gstate.getBlendFuncB()]));
}
case GE_COMP_LEQUAL:
return gstate.getAlphaTestRef() == 255;
case GE_COMP_EQUAL:
case GE_COMP_LESS:
return false;
default:
return false;
}
}
const bool nonAlphaSrcFactors[16] = {
true, // GE_SRCBLEND_DSTCOLOR,
true, // GE_SRCBLEND_INVDSTCOLOR,
false, // GE_SRCBLEND_SRCALPHA,
false, // GE_SRCBLEND_INVSRCALPHA,
true, // GE_SRCBLEND_DSTALPHA,
true, // GE_SRCBLEND_INVDSTALPHA,
false, // GE_SRCBLEND_DOUBLESRCALPHA,
false, // GE_SRCBLEND_DOUBLEINVSRCALPHA,
true, // GE_SRCBLEND_DOUBLEDSTALPHA,
true, // GE_SRCBLEND_DOUBLEINVDSTALPHA,
true, // GE_SRCBLEND_FIXA,
};
const bool nonAlphaDestFactors[16] = {
true, // GE_DSTBLEND_SRCCOLOR,
true, // GE_DSTBLEND_INVSRCCOLOR,
false, // GE_DSTBLEND_SRCALPHA,
false, // GE_DSTBLEND_INVSRCALPHA,
true, // GE_DSTBLEND_DSTALPHA,
true, // GE_DSTBLEND_INVDSTALPHA,
false, // GE_DSTBLEND_DOUBLESRCALPHA,
false, // GE_DSTBLEND_DOUBLEINVSRCALPHA,
true, // GE_DSTBLEND_DOUBLEDSTALPHA,
true, // GE_DSTBLEND_DOUBLEINVDSTALPHA,
true, // GE_DSTBLEND_FIXB,
};
ReplaceAlphaType ReplaceAlphaWithStencil() {
if (!gstate.isStencilTestEnabled() || gstate.isModeClear()) {
return REPLACE_ALPHA_NO;
}
if (gstate.isAlphaBlendEnabled()) {
if (nonAlphaSrcFactors[gstate.getBlendFuncA()] && nonAlphaDestFactors[gstate.getBlendFuncB()]) {
return REPLACE_ALPHA_YES;
} else if (ShouldUseShaderBlending()) {
return REPLACE_ALPHA_YES;
} else {
if (gl_extensions.ARB_blend_func_extended) {
return REPLACE_ALPHA_DUALSOURCE;
} else {
return REPLACE_ALPHA_NO;
}
}
}
return REPLACE_ALPHA_YES;
}
StencilValueType ReplaceAlphaWithStencilType() {
switch (gstate.FrameBufFormat()) {
case GE_FORMAT_565:
// There's never a stencil value. Maybe the right alpha is 1?
return STENCIL_VALUE_ONE;
case GE_FORMAT_5551:
switch (gstate.getStencilOpZPass()) {
// Technically, this should only ever use zero/one.
case GE_STENCILOP_REPLACE:
return (gstate.getStencilTestRef() & 0x80) != 0 ? STENCIL_VALUE_ONE : STENCIL_VALUE_ZERO;
// Decrementing always zeros, since there's only one bit.
case GE_STENCILOP_DECR:
case GE_STENCILOP_ZERO:
return STENCIL_VALUE_ZERO;
// Incrementing always fills, since there's only one bit.
case GE_STENCILOP_INCR:
return STENCIL_VALUE_ONE;
case GE_STENCILOP_INVERT:
return STENCIL_VALUE_UNKNOWN;
case GE_STENCILOP_KEEP:
return STENCIL_VALUE_KEEP;
}
break;
case GE_FORMAT_4444:
case GE_FORMAT_8888:
case GE_FORMAT_INVALID:
switch (gstate.getStencilOpZPass()) {
case GE_STENCILOP_REPLACE:
return STENCIL_VALUE_UNIFORM;
case GE_STENCILOP_ZERO:
if (gstate.getStencilOpZFail() == GE_STENCILOP_ZERO) {
return STENCIL_VALUE_ZERO;
} else {
return STENCIL_VALUE_KEEP;
}
case GE_STENCILOP_DECR:
case GE_STENCILOP_INCR:
case GE_STENCILOP_INVERT:
return STENCIL_VALUE_UNKNOWN;
case GE_STENCILOP_KEEP:
return STENCIL_VALUE_KEEP;
}
break;
}
return STENCIL_VALUE_UNKNOWN;
}
bool IsColorTestTriviallyTrue() {
switch (gstate.getColorTestFunction()) {
case GE_COMP_NEVER:
return false;
case GE_COMP_ALWAYS:
return true;
case GE_COMP_EQUAL:
case GE_COMP_NOTEQUAL:
return false;
default:
return false;
}
}
static bool AlphaToColorDoubling() {
if (!gstate.isAlphaBlendEnabled()) {
return false;
}
// 2x alpha in the source function and not in the dest = source color doubling.
switch (gstate.getBlendFuncA()) {
case GE_SRCBLEND_DOUBLESRCALPHA:
case GE_SRCBLEND_DOUBLEINVSRCALPHA:
break;
case GE_SRCBLEND_DOUBLEDSTALPHA:
case GE_SRCBLEND_DOUBLEINVDSTALPHA:
// Even dest alpha is safe, since we're moving the * 2.0 into the src color.
break;
default:
return false;
}
switch (gstate.getBlendFuncB()) {
case GE_DSTBLEND_SRCCOLOR:
case GE_DSTBLEND_INVSRCCOLOR:
// Can't double, we need the source color to be correct.
return false;
case GE_DSTBLEND_DOUBLESRCALPHA:
case GE_DSTBLEND_DOUBLEINVSRCALPHA:
case GE_DSTBLEND_DOUBLEDSTALPHA:
case GE_DSTBLEND_DOUBLEINVDSTALPHA:
// Won't do the trick, would be better to double both sides.
return false;
default:
// In all other cases, we're pre-multiplying the src side by 2.
// For example, src * (2.0 * a) + dst * fixB, we're just moving the 2.0.
return true;
}
}
static bool CanDoubleSrcBlendMode() {
if (!gstate.isAlphaBlendEnabled()) {
return false;
}
int funcA = gstate.getBlendFuncA();
int funcB = gstate.getBlendFuncB();
if (funcA != GE_SRCBLEND_DOUBLESRCALPHA && funcA != GE_SRCBLEND_DOUBLEINVSRCALPHA) {
funcB = funcA;
funcA = gstate.getBlendFuncB();
}
if (funcA != GE_SRCBLEND_DOUBLESRCALPHA && funcA != GE_SRCBLEND_DOUBLEINVSRCALPHA) {
return false;
}
// One side should be doubled. Let's check the other side.
// LittleBigPlanet and Persona 2, for example, uses 2.0 * src.a, 1.0 - src.a, which can't double.
// In that case, we can double the src rgb instead.
switch (funcB) {
case GE_DSTBLEND_SRCALPHA:
case GE_DSTBLEND_INVSRCALPHA:
return false;
default:
return true;
}
}
// TODO: Setting to disable?
bool ShouldUseShaderBlending() {
if (!gstate.isAlphaBlendEnabled()) {
return false;
}
if (g_Config.iRenderingMode == FB_NON_BUFFERED_MODE) {
return false;
}
GEBlendSrcFactor funcA = gstate.getBlendFuncA();
GEBlendDstFactor funcB = gstate.getBlendFuncB();
GEBlendMode eq = gstate.getBlendEq();
switch (eq) {
case GE_BLENDMODE_ABSDIFF:
return true;
case GE_BLENDMODE_MIN:
case GE_BLENDMODE_MAX:
// These don't use the factors.
return !gl_extensions.EXT_blend_minmax && !gl_extensions.GLES3;
default:
break;
}
// This normally involves a blit, so try to skip it.
if (AlphaToColorDoubling() || CanDoubleSrcBlendMode()) {
return false;
}
switch (funcA) {
case GE_SRCBLEND_DOUBLESRCALPHA:
case GE_SRCBLEND_DOUBLEINVSRCALPHA:
case GE_SRCBLEND_DOUBLEDSTALPHA:
case GE_SRCBLEND_DOUBLEINVDSTALPHA:
return true;
case GE_SRCBLEND_FIXA:
if (funcB == GE_DSTBLEND_FIXB) {
u32 fixA = gstate.getFixA();
u32 fixB = gstate.getFixB();
// OpenGL only supports one constant color, so check if we could be more exact.
if (fixA != fixB && fixA != 0xFFFFFF - fixB && fixA != 0 && fixB != 0 && fixA != 0xFFFFFF && fixB != 0xFFFFFF) {
return true;
}
}
default:
break;
}
switch (funcB) {
case GE_DSTBLEND_DOUBLESRCALPHA:
case GE_DSTBLEND_DOUBLEINVSRCALPHA:
case GE_DSTBLEND_DOUBLEDSTALPHA:
case GE_DSTBLEND_DOUBLEINVDSTALPHA:
return true;
default:
break;
}
return false;
}
// Doesn't need to be in the shader id, ShouldUseShaderBlending contains all parts.
bool ShouldUseShaderFixedBlending() {
if (!ShouldUseShaderBlending()) {
return false;
}
if (gstate.getBlendFuncA() == GE_SRCBLEND_FIXA && gstate.getBlendFuncB() == GE_DSTBLEND_FIXB) {
GEBlendMode blendEq = gstate.getBlendEq();
return blendEq != GE_BLENDMODE_MIN && blendEq != GE_BLENDMODE_MAX && blendEq != GE_BLENDMODE_ABSDIFF;
}
return false;
}
// Here we must take all the bits of the gstate that determine what the fragment shader will
// look like, and concatenate them together into an ID.
void ComputeFragmentShaderID(FragmentShaderID *id) {
int id0 = 0;
int id1 = 0;
if (gstate.isModeClear()) {
// We only need one clear shader, so let's ignore the rest of the bits.
id0 = 1;
} else {
bool lmode = gstate.isUsingSecondaryColor() && gstate.isLightingEnabled();
bool enableFog = gstate.isFogEnabled() && !gstate.isModeThrough();
bool enableAlphaTest = gstate.isAlphaTestEnabled() && !IsAlphaTestTriviallyTrue() && !g_Config.bDisableAlphaTest;
bool alphaTestAgainstZero = gstate.getAlphaTestRef() == 0 && gstate.getAlphaTestMask() == 0xFF;
bool enableColorTest = gstate.isColorTestEnabled() && !IsColorTestTriviallyTrue();
bool useShaderBlending = ShouldUseShaderBlending();
bool alphaToColorDoubling = AlphaToColorDoubling() && !useShaderBlending;
bool enableColorDoubling = (gstate.isColorDoublingEnabled() && gstate.isTextureMapEnabled()) || alphaToColorDoubling;
// This isn't really correct, but it's a hack to get doubled blend modes to work more correctly.
bool enableAlphaDoubling = !alphaToColorDoubling && !useShaderBlending && CanDoubleSrcBlendMode();
bool doTextureProjection = gstate.getUVGenMode() == GE_TEXMAP_TEXTURE_MATRIX;
bool doTextureAlpha = gstate.isTextureAlphaUsed();
ReplaceAlphaType stencilToAlpha = ReplaceAlphaWithStencil();
// All texfuncs except replace are the same for RGB as for RGBA with full alpha.
if (gstate_c.textureFullAlpha && gstate.getTextureFunction() != GE_TEXFUNC_REPLACE)
doTextureAlpha = false;
// id0 |= (gstate.isModeClear() & 1);
if (gstate.isTextureMapEnabled()) {
id0 |= 1 << 1;
id0 |= gstate.getTextureFunction() << 2;
id0 |= (doTextureAlpha & 1) << 5; // rgb or rgba
id0 |= (gstate_c.flipTexture & 1) << 6;
if (gstate_c.needShaderTexClamp) {
bool textureAtOffset = gstate_c.curTextureXOffset != 0 || gstate_c.curTextureYOffset != 0;
// 3 bits total.
id0 |= 1 << 7;
id0 |= gstate.isTexCoordClampedS() << 8;
id0 |= gstate.isTexCoordClampedT() << 9;
id0 |= (textureAtOffset & 1) << 10;
}
}
id0 |= (lmode & 1) << 11;
if (enableAlphaTest) {
// 4 bits total.
id0 |= 1 << 12;
id0 |= gstate.getAlphaTestFunction() << 13;
}
if (enableColorTest) {
// 3 bits total.
id0 |= 1 << 16;
id0 |= gstate.getColorTestFunction() << 17;
}
id0 |= (enableFog & 1) << 19;
id0 |= (doTextureProjection & 1) << 20;
id0 |= (enableColorDoubling & 1) << 21;
id0 |= (enableAlphaDoubling & 1) << 22;
// 2 bits
id0 |= (stencilToAlpha) << 23;
if (stencilToAlpha != REPLACE_ALPHA_NO) {
// 3 bits
id0 |= ReplaceAlphaWithStencilType() << 25;
}
id0 |= (alphaTestAgainstZero & 1) << 28;
if (enableAlphaTest)
gpuStats.numAlphaTestedDraws++;
else
gpuStats.numNonAlphaTestedDraws++;
// 29 - 31 are free.
if (useShaderBlending) {
// 12 bits total.
id1 |= 1 << 0;
id1 |= gstate.getBlendEq() << 1;
id1 |= gstate.getBlendFuncA() << 4;
id1 |= gstate.getBlendFuncB() << 8;
}
}
id->d[0] = id0;
id->d[1] = id1;
}
// Missing: Z depth range
void GenerateFragmentShader(char *buffer) {
char *p = buffer;
// In GLSL ES 3.0, you use "in" variables instead of varying.
bool glslES30 = false;
const char *varying = "varying";
const char *fragColor0 = "gl_FragColor";
const char *texture = "texture2D";
bool highpFog = false;
bool bitwiseOps = false;
#if defined(USING_GLES2)
// Let's wait until we have a real use for this.
// ES doesn't support dual source alpha :(
if (gl_extensions.GLES3) {
WRITE(p, "#version 300 es\n"); // GLSL ES 1.0
fragColor0 = "fragColor0";
texture = "texture";
glslES30 = true;
bitwiseOps = true;
} else {
WRITE(p, "#version 100\n"); // GLSL ES 1.0
}
WRITE(p, "precision lowp float;\n");
// PowerVR needs highp to do the fog in MHU correctly.
// Others don't, and some can't handle highp in the fragment shader.
highpFog = gl_extensions.gpuVendor == GPU_VENDOR_POWERVR;
// GL_NV_shader_framebuffer_fetch available on mobile platform and ES 2.0 only but not desktop
if (gl_extensions.NV_shader_framebuffer_fetch) {
WRITE(p, " #extension GL_NV_shader_framebuffer_fetch : require\n");
}
#elif !defined(FORCE_OPENGL_2_0)
if (gl_extensions.VersionGEThan(3, 3, 0)) {
fragColor0 = "fragColor0";
texture = "texture";
glslES30 = true;
bitwiseOps = true;
WRITE(p, "#version 330\n");
WRITE(p, "#define lowp\n");
WRITE(p, "#define mediump\n");
WRITE(p, "#define highp\n");
} else if (gl_extensions.VersionGEThan(3, 0, 0)) {
fragColor0 = "fragColor0";
bitwiseOps = true;
WRITE(p, "#version 130\n");
// Remove lowp/mediump in non-mobile non-glsl 3 implementations
WRITE(p, "#define lowp\n");
WRITE(p, "#define mediump\n");
WRITE(p, "#define highp\n");
} else {
WRITE(p, "#version 110\n");
// Remove lowp/mediump in non-mobile non-glsl 3 implementations
WRITE(p, "#define lowp\n");
WRITE(p, "#define mediump\n");
WRITE(p, "#define highp\n");
}
#else
// Need to remove lowp/mediump for Mac
WRITE(p, "#define lowp\n");
WRITE(p, "#define mediump\n");
WRITE(p, "#define highp\n");
#endif
if (glslES30) {
varying = "in";
}
bool lmode = gstate.isUsingSecondaryColor() && gstate.isLightingEnabled();
bool doTexture = gstate.isTextureMapEnabled() && !gstate.isModeClear();
bool enableFog = gstate.isFogEnabled() && !gstate.isModeThrough() && !gstate.isModeClear();
bool enableAlphaTest = gstate.isAlphaTestEnabled() && !IsAlphaTestTriviallyTrue() && !gstate.isModeClear() && !g_Config.bDisableAlphaTest;
bool alphaTestAgainstZero = gstate.getAlphaTestRef() == 0 && gstate.getAlphaTestMask() == 0xFF;
bool enableColorTest = gstate.isColorTestEnabled() && !IsColorTestTriviallyTrue() && !gstate.isModeClear();
bool useShaderBlending = ShouldUseShaderBlending();
bool alphaToColorDoubling = AlphaToColorDoubling() && !useShaderBlending;
bool enableColorDoubling = (gstate.isColorDoublingEnabled() && gstate.isTextureMapEnabled()) || alphaToColorDoubling;
// This isn't really correct, but it's a hack to get doubled blend modes to work more correctly.
bool enableAlphaDoubling = !alphaToColorDoubling && !useShaderBlending && CanDoubleSrcBlendMode();
bool doTextureProjection = gstate.getUVGenMode() == GE_TEXMAP_TEXTURE_MATRIX;
bool doTextureAlpha = gstate.isTextureAlphaUsed();
bool textureAtOffset = gstate_c.curTextureXOffset != 0 || gstate_c.curTextureYOffset != 0;
ReplaceAlphaType stencilToAlpha = ReplaceAlphaWithStencil();
if (gstate_c.textureFullAlpha && gstate.getTextureFunction() != GE_TEXFUNC_REPLACE)
doTextureAlpha = false;
if (doTexture)
WRITE(p, "uniform sampler2D tex;\n");
if (!gstate.isModeClear() && useShaderBlending) {
if (!gl_extensions.NV_shader_framebuffer_fetch) {
if (!gl_extensions.VersionGEThan(3, 0, 0) && !gl_extensions.GLES3) {
WRITE(p, "uniform vec2 u_fbotexSize;\n");
}
WRITE(p, "uniform sampler2D fbotex;\n");
}
if (gstate.getBlendFuncA() == GE_SRCBLEND_FIXA) {
WRITE(p, "uniform vec3 u_blendFixA;\n");
}
if (gstate.getBlendFuncB() == GE_DSTBLEND_FIXB) {
WRITE(p, "uniform vec3 u_blendFixB;\n");
}
}
if (gstate_c.needShaderTexClamp && doTexture) {
WRITE(p, "uniform vec4 u_texclamp;\n");
if (textureAtOffset) {
WRITE(p, "uniform vec2 u_texclampoff;\n");
}
}
if (enableAlphaTest || enableColorTest) {
WRITE(p, "uniform vec4 u_alphacolorref;\n");
if (bitwiseOps && (enableColorTest || !alphaTestAgainstZero)) {
WRITE(p, "uniform ivec4 u_alphacolormask;\n");
}
}
if (stencilToAlpha && ReplaceAlphaWithStencilType() == STENCIL_VALUE_UNIFORM) {
WRITE(p, "uniform float u_stencilReplaceValue;\n");
}
if (gstate.isTextureMapEnabled() && gstate.getTextureFunction() == GE_TEXFUNC_BLEND)
WRITE(p, "uniform vec3 u_texenv;\n");
WRITE(p, "%s vec4 v_color0;\n", varying);
if (lmode)
WRITE(p, "%s vec3 v_color1;\n", varying);
if (enableFog) {
WRITE(p, "uniform vec3 u_fogcolor;\n");
WRITE(p, "%s %s float v_fogdepth;\n", varying, highpFog ? "highp" : "mediump");
}
if (doTexture) {
if (doTextureProjection)
WRITE(p, "%s mediump vec3 v_texcoord;\n", varying);
else
WRITE(p, "%s mediump vec2 v_texcoord;\n", varying);
}
if (enableAlphaTest && !alphaTestAgainstZero) {
if (bitwiseOps) {
WRITE(p, "int roundAndScaleTo255i(in float x) { return int(floor(x * 255.0 + 0.5)); }\n");
} else if (gl_extensions.gpuVendor == GPU_VENDOR_POWERVR) {
WRITE(p, "float roundTo255thf(in mediump float x) { mediump float y = x + (0.5/255.0); return y - fract(y * 255.0) * (1.0 / 255.0); }\n");
} else {
WRITE(p, "float roundAndScaleTo255f(in float x) { return floor(x * 255.0 + 0.5); }\n");
}
}
if (enableColorTest) {
if (bitwiseOps) {
WRITE(p, "ivec3 roundAndScaleTo255iv(in vec3 x) { return ivec3(floor(x * 255.0 + 0.5)); }\n");
} else if (gl_extensions.gpuVendor == GPU_VENDOR_POWERVR) {
WRITE(p, "vec3 roundTo255thv(in vec3 x) { vec3 y = x + (0.5/255.0); return y - fract(y * 255.0) * (1.0 / 255.0); }\n");
} else {
WRITE(p, "vec3 roundAndScaleTo255v(in vec3 x) { return floor(x * 255.0 + 0.5); }\n");
}
}
if (stencilToAlpha == REPLACE_ALPHA_DUALSOURCE) {
WRITE(p, "out vec4 fragColor0;\n");
WRITE(p, "out vec4 fragColor1;\n");
} else if (!strcmp(fragColor0, "fragColor0")) {
WRITE(p, "out vec4 fragColor0;\n");
}
WRITE(p, "void main() {\n");
if (gstate.isModeClear()) {
// Clear mode does not allow any fancy shading.
WRITE(p, " vec4 v = v_color0;\n");
} else {
const char *secondary = "";
// Secondary color for specular on top of texture
if (lmode) {
WRITE(p, " vec4 s = vec4(v_color1, 0.0);\n");
secondary = " + s";
} else {
secondary = "";
}
if (gstate.isTextureMapEnabled()) {
const char *texcoord = "v_texcoord";
// TODO: Not sure the right way to do this for projection.
if (gstate_c.needShaderTexClamp) {
// We may be clamping inside a larger surface (tex = 64x64, buffer=480x272).
// We may also be wrapping in such a surface, or either one in a too-small surface.
// Obviously, clamping to a smaller surface won't work. But better to clamp to something.
std::string ucoord = "v_texcoord.x";
std::string vcoord = "v_texcoord.y";
if (doTextureProjection) {
ucoord += " / v_texcoord.z";
vcoord = "(v_texcoord.y / v_texcoord.z)";
// Vertex texcoords are NOT flipped when projecting despite gstate_c.flipTexture.
} else if (gstate_c.flipTexture) {
vcoord = "1.0 - " + vcoord;
}
if (gstate.isTexCoordClampedS()) {
ucoord = "clamp(" + ucoord + ", u_texclamp.z, u_texclamp.x - u_texclamp.z)";
} else {
ucoord = "mod(" + ucoord + ", u_texclamp.x)";
}
// The v coordinate is more tricky, since it's flipped.
if (gstate.isTexCoordClampedT()) {
vcoord = "clamp(" + vcoord + ", u_texclamp.w, u_texclamp.y - u_texclamp.w)";
} else {
vcoord = "mod(" + vcoord + ", u_texclamp.y)";
}
if (textureAtOffset) {
ucoord = "(" + ucoord + " + u_texclampoff.x)";
vcoord = "(" + vcoord + " + u_texclampoff.y)";
}
if (gstate_c.flipTexture) {
vcoord = "1.0 - " + vcoord;
}
WRITE(p, " vec2 fixedcoord = vec2(%s, %s);\n", ucoord.c_str(), vcoord.c_str());
texcoord = "fixedcoord";
// We already projected it.
doTextureProjection = false;
} else if (doTextureProjection && gstate_c.flipTexture) {
// Since we need to flip v, we project manually.
WRITE(p, " vec2 fixedcoord = vec2(v_texcoord.x / v_texcoord.z, 1.0 - (v_texcoord.y / v_texcoord.z));\n");
texcoord = "fixedcoord";
doTextureProjection = false;
}
if (doTextureProjection) {
WRITE(p, " vec4 t = %sProj(tex, %s);\n", texture, texcoord);
} else {
WRITE(p, " vec4 t = %s(tex, %s);\n", texture, texcoord);
}
WRITE(p, " vec4 p = v_color0;\n");
if (doTextureAlpha) { // texfmt == RGBA
switch (gstate.getTextureFunction()) {
case GE_TEXFUNC_MODULATE:
WRITE(p, " vec4 v = p * t%s;\n", secondary);
break;
case GE_TEXFUNC_DECAL:
WRITE(p, " vec4 v = vec4(mix(p.rgb, t.rgb, t.a), p.a)%s;\n", secondary);
break;
case GE_TEXFUNC_BLEND:
WRITE(p, " vec4 v = vec4(mix(p.rgb, u_texenv.rgb, t.rgb), p.a * t.a)%s;\n", secondary);
break;
case GE_TEXFUNC_REPLACE:
WRITE(p, " vec4 v = t%s;\n", secondary);
break;
case GE_TEXFUNC_ADD:
case GE_TEXFUNC_UNKNOWN1:
case GE_TEXFUNC_UNKNOWN2:
case GE_TEXFUNC_UNKNOWN3:
WRITE(p, " vec4 v = vec4(p.rgb + t.rgb, p.a * t.a)%s;\n", secondary);
break;
default:
WRITE(p, " vec4 v = p;\n"); break;
}
} else { // texfmt == RGB
switch (gstate.getTextureFunction()) {
case GE_TEXFUNC_MODULATE:
WRITE(p, " vec4 v = vec4(t.rgb * p.rgb, p.a)%s;\n", secondary);
break;
case GE_TEXFUNC_DECAL:
WRITE(p, " vec4 v = vec4(t.rgb, p.a)%s;\n", secondary);
break;
case GE_TEXFUNC_BLEND:
WRITE(p, " vec4 v = vec4(mix(p.rgb, u_texenv.rgb, t.rgb), p.a)%s;\n", secondary);
break;
case GE_TEXFUNC_REPLACE:
WRITE(p, " vec4 v = vec4(t.rgb, p.a)%s;\n", secondary);
break;
case GE_TEXFUNC_ADD:
case GE_TEXFUNC_UNKNOWN1:
case GE_TEXFUNC_UNKNOWN2:
case GE_TEXFUNC_UNKNOWN3:
WRITE(p, " vec4 v = vec4(p.rgb + t.rgb, p.a)%s;\n", secondary); break;
default:
WRITE(p, " vec4 v = p;\n"); break;
}
}
} else {
// No texture mapping
WRITE(p, " vec4 v = v_color0 %s;\n", secondary);
}
if (enableAlphaTest) {
GEComparison alphaTestFunc = gstate.getAlphaTestFunction();
const char *alphaTestFuncs[] = { "#", "#", " != ", " == ", " >= ", " > ", " <= ", " < " };
if (alphaTestFuncs[alphaTestFunc][0] != '#') {
if (alphaTestAgainstZero) {
// When testing against 0 (extremely common), we can avoid some math.
// 0.002 is approximately half of 1.0 / 255.0.
if (alphaTestFunc == GE_COMP_NOTEQUAL || alphaTestFunc == GE_COMP_GREATER) {
WRITE(p, " if (v.a < 0.002) discard;\n");
} else {
// Anything else is a test for == 0. Happens sometimes, actually...
WRITE(p, " if (v.a > 0.002) discard;\n");
}
} else if (bitwiseOps) {
WRITE(p, " if ((roundAndScaleTo255i(v.a) & u_alphacolormask.a) %s int(u_alphacolorref.a)) discard;\n", alphaTestFuncs[alphaTestFunc]);
} else if (gl_extensions.gpuVendor == GPU_VENDOR_POWERVR) {
// Work around bad PVR driver problem where equality check + discard just doesn't work.
if (alphaTestFunc != GE_COMP_NOTEQUAL)
WRITE(p, " if (roundTo255thf(v.a) %s u_alphacolorref.a) discard;\n", alphaTestFuncs[alphaTestFunc]);
} else {
WRITE(p, " if (roundAndScaleTo255f(v.a) %s u_alphacolorref.a) discard;\n", alphaTestFuncs[alphaTestFunc]);
}
} else {
// NEVER has been logged as used by games, although it makes little sense - statically failing.
// Maybe we could discard the drawcall, but it's pretty rare. Let's just statically discard here.
WRITE(p, " discard;\n");
}
}
if (enableColorTest) {
GEComparison colorTestFunc = gstate.getColorTestFunction();
const char *colorTestFuncs[] = { "#", "#", " != ", " == " };
if (colorTestFuncs[colorTestFunc][0] != '#') {
if (bitwiseOps) {
WRITE(p, " if ((roundAndScaleTo255iv(v.rgb) & u_alphacolormask.rgb) %s (ivec3(u_alphacolorref.rgb) & u_alphacolormask.rgb)) discard;\n", colorTestFuncs[colorTestFunc]);
} else if (gl_extensions.gpuVendor == GPU_VENDOR_POWERVR) {
WRITE(p, " if (roundTo255thv(v.rgb) %s u_alphacolorref.rgb) discard;\n", colorTestFuncs[colorTestFunc]);
} else {
WRITE(p, " if (roundAndScaleTo255v(v.rgb) %s u_alphacolorref.rgb) discard;\n", colorTestFuncs[colorTestFunc]);
}
} else {
WRITE(p, " discard;\n");
}
}
// Color doubling happens after the color test.
if (enableColorDoubling && enableAlphaDoubling) {
WRITE(p, " v = v * 2.0;\n");
} else if (enableColorDoubling) {
WRITE(p, " v.rgb = v.rgb * 2.0;\n");
} else if (enableAlphaDoubling) {
WRITE(p, " v.a = v.a * 2.0;\n");
}
if (enableFog) {
WRITE(p, " float fogCoef = clamp(v_fogdepth, 0.0, 1.0);\n");
WRITE(p, " v = mix(vec4(u_fogcolor, v.a), v, fogCoef);\n");
// WRITE(p, " v.x = v_depth;\n");
}
if (ShouldUseShaderFixedBlending()) {
// Just premultiply by u_blendFixA.
WRITE(p, " v.rgb = v.rgb * u_blendFixA;\n");
} else if (useShaderBlending) {
// If we have NV_shader_framebuffer_fetch / EXT_shader_framebuffer_fetch, we skip the blit.
// We can just read the prev value more directly.
// TODO: EXT_shader_framebuffer_fetch on iOS 6, possibly others.
if (gl_extensions.NV_shader_framebuffer_fetch) {
WRITE(p, " lowp vec4 destColor = gl_LastFragData[0];\n");
} else if (!gl_extensions.VersionGEThan(3, 0, 0) && !gl_extensions.GLES3) {
WRITE(p, " lowp vec4 destColor = %s(fbotex, gl_FragCoord.xy * u_fbotexSize.xy);\n", texture);
} else {
WRITE(p, " lowp vec4 destColor = texelFetch(fbotex, ivec2(gl_FragCoord.x, gl_FragCoord.y), 0);\n");
}
GEBlendSrcFactor funcA = gstate.getBlendFuncA();
GEBlendDstFactor funcB = gstate.getBlendFuncB();
GEBlendMode eq = gstate.getBlendEq();
const char *srcFactor = "vec3(1.0)";
const char *dstFactor = "vec3(0.0)";
switch (funcA)
{
case GE_SRCBLEND_DSTCOLOR: srcFactor = "destColor.rgb"; break;
case GE_SRCBLEND_INVDSTCOLOR: srcFactor = "(vec3(1.0) - destColor.rgb)"; break;
case GE_SRCBLEND_SRCALPHA: srcFactor = "vec3(v.a)"; break;
case GE_SRCBLEND_INVSRCALPHA: srcFactor = "vec3(1.0 - v.a)"; break;
case GE_SRCBLEND_DSTALPHA: srcFactor = "vec3(destColor.a)"; break;
case GE_SRCBLEND_INVDSTALPHA: srcFactor = "vec3(1.0 - destColor.a)"; break;
case GE_SRCBLEND_DOUBLESRCALPHA: srcFactor = "vec3(v.a * 2.0)"; break;
// TODO: Double inverse, or inverse double? Following softgpu for now...
case GE_SRCBLEND_DOUBLEINVSRCALPHA: srcFactor = "vec3(1.0 - v.a * 2.0)"; break;
case GE_SRCBLEND_DOUBLEDSTALPHA: srcFactor = "vec3(destColor.a * 2.0)"; break;
case GE_SRCBLEND_DOUBLEINVDSTALPHA: srcFactor = "vec3(1.0 - destColor.a * 2.0)"; break;
case GE_SRCBLEND_FIXA: srcFactor = "u_blendFixA"; break;
}
switch (funcB)
{
case GE_DSTBLEND_SRCCOLOR: dstFactor = "v.rgb"; break;
case GE_DSTBLEND_INVSRCCOLOR: dstFactor = "(vec3(1.0) - v.rgb)"; break;
case GE_DSTBLEND_SRCALPHA: dstFactor = "vec3(v.a)"; break;
case GE_DSTBLEND_INVSRCALPHA: dstFactor = "vec3(1.0 - v.a)"; break;
case GE_DSTBLEND_DSTALPHA: dstFactor = "vec3(destColor.a)"; break;
case GE_DSTBLEND_INVDSTALPHA: dstFactor = "vec3(1.0 - destColor.a)"; break;
case GE_DSTBLEND_DOUBLESRCALPHA: dstFactor = "vec3(v.a * 2.0)"; break;
case GE_DSTBLEND_DOUBLEINVSRCALPHA: dstFactor = "vec3(1.0 - v.a * 2.0)"; break;
case GE_DSTBLEND_DOUBLEDSTALPHA: dstFactor = "vec3(destColor.a * 2.0)"; break;
case GE_DSTBLEND_DOUBLEINVDSTALPHA: dstFactor = "vec3(1.0 - destColor.a * 2.0)"; break;
case GE_DSTBLEND_FIXB: dstFactor = "u_blendFixB"; break;
}
switch (eq)
{
case GE_BLENDMODE_MUL_AND_ADD:
WRITE(p, " v.rgb = v.rgb * %s + destColor.rgb * %s;\n", srcFactor, dstFactor);
break;
case GE_BLENDMODE_MUL_AND_SUBTRACT:
WRITE(p, " v.rgb = v.rgb * %s - destColor.rgb * %s;\n", srcFactor, dstFactor);
break;
case GE_BLENDMODE_MUL_AND_SUBTRACT_REVERSE:
WRITE(p, " v.rgb = destColor.rgb * %s - v.rgb * %s;\n", srcFactor, dstFactor);
break;
case GE_BLENDMODE_MIN:
WRITE(p, " v.rgb = min(v.rgb, destColor.rgb);\n");
break;
case GE_BLENDMODE_MAX:
WRITE(p, " v.rgb = max(v.rgb, destColor.rgb);\n");
break;
case GE_BLENDMODE_ABSDIFF:
WRITE(p, " v.rgb = abs(v.rgb - destColor.rgb);\n");
break;
}
}
}
switch (stencilToAlpha) {
case REPLACE_ALPHA_DUALSOURCE:
WRITE(p, " fragColor0 = vec4(v.rgb, 0.0);\n");
WRITE(p, " fragColor1 = vec4(0.0, 0.0, 0.0, v.a);\n");
break;
case REPLACE_ALPHA_YES:
WRITE(p, " %s = vec4(v.rgb, 0.0);\n", fragColor0);
break;
case REPLACE_ALPHA_NO:
WRITE(p, " %s = v;\n", fragColor0);
break;
}
if (stencilToAlpha != REPLACE_ALPHA_NO) {
switch (ReplaceAlphaWithStencilType()) {
case STENCIL_VALUE_UNIFORM:
WRITE(p, " %s.a = u_stencilReplaceValue;\n", fragColor0);
break;
case STENCIL_VALUE_ZERO:
WRITE(p, " %s.a = 0.0;\n", fragColor0);
break;
case STENCIL_VALUE_ONE:
WRITE(p, " %s.a = 1.0;\n", fragColor0);
break;
case STENCIL_VALUE_UNKNOWN:
// Maybe we should even mask away alpha using glColorMask and not change it at all? We do get here
// if the stencil mode is KEEP for example.
WRITE(p, " %s.a = 0.0;\n", fragColor0);
break;
case STENCIL_VALUE_KEEP:
// Do nothing. We'll mask out the alpha using color mask.
break;
}
}
#ifdef DEBUG_SHADER
if (doTexture) {
WRITE(p, " %s = texture2D(tex, v_texcoord.xy);\n", fragColor0);
WRITE(p, " %s += vec4(0.3,0,0.3,0.3);\n", fragColor0);
} else {
WRITE(p, " %s = vec4(1,0,1,1);\n", fragColor0);
}
#endif
WRITE(p, "}\n");
}
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