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ppsspp/GPU/GLES/FragmentShaderGeneratorGLES.cpp
Henrik Rydgård 0e3a84b4a8 Move most GPU things to Common. 
It works after the move, on Windows and Android at least.

Deletes the D3DX9 shader compiler loader, which was not used.
2020-10-04 23:39:02 +02:00

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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/.
#include <cstdio>
#include <sstream>
#include "Common/Log.h"
#include "Common/StringUtils.h"
#include "Common/GPU/OpenGL/GLFeatures.h"
#include "Core/Reporting.h"
#include "Core/Config.h"
#include "GPU/Common/GPUStateUtils.h"
#include "GPU/Common/ShaderId.h"
#include "GPU/GLES/FragmentShaderGeneratorGLES.h"
#include "GPU/GLES/FramebufferManagerGLES.h"
#include "GPU/GLES/ShaderManagerGLES.h"
#include "GPU/ge_constants.h"
#include "GPU/GPUState.h"
#define WRITE p+=sprintf
// #define DEBUG_SHADER
// Missing: Z depth range
bool GenerateFragmentShader(const FShaderID &id, char *buffer, uint64_t *uniformMask) {
char *p = buffer;
*uniformMask = 0;
// 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 *fragColor1 = "fragColor1";
const char *texture = "texture2D";
const char *texelFetch = NULL;
bool highpFog = false;
bool highpTexcoord = false;
bool bitwiseOps = false;
const char *lastFragData = nullptr;
ReplaceAlphaType stencilToAlpha = static_cast<ReplaceAlphaType>(id.Bits(FS_BIT_STENCIL_TO_ALPHA, 2));
if (gl_extensions.IsGLES) {
// ES doesn't support dual source alpha :(
if (gstate_c.Supports(GPU_SUPPORTS_GLSL_ES_300)) {
WRITE(p, "#version 300 es\n"); // GLSL ES 3.0
fragColor0 = "fragColor0";
texture = "texture";
glslES30 = true;
bitwiseOps = true;
texelFetch = "texelFetch";
if (stencilToAlpha == REPLACE_ALPHA_DUALSOURCE && gl_extensions.EXT_blend_func_extended) {
WRITE(p, "#extension GL_EXT_blend_func_extended : require\n");
}
} else {
WRITE(p, "#version 100\n"); // GLSL ES 1.0
if (gl_extensions.EXT_gpu_shader4) {
WRITE(p, "#extension GL_EXT_gpu_shader4 : enable\n");
bitwiseOps = true;
texelFetch = "texelFetch2D";
}
if (gl_extensions.EXT_blend_func_extended) {
// Oldy moldy GLES, so use the fixed output name.
fragColor1 = "gl_SecondaryFragColorEXT";
if (stencilToAlpha == REPLACE_ALPHA_DUALSOURCE && gl_extensions.EXT_blend_func_extended) {
WRITE(p, "#extension GL_EXT_blend_func_extended : require\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.bugs & BUG_PVR_SHADER_PRECISION_BAD) ? true : false;
highpTexcoord = highpFog;
if (gstate_c.Supports(GPU_SUPPORTS_ANY_FRAMEBUFFER_FETCH)) {
if (gstate_c.Supports(GPU_SUPPORTS_GLSL_ES_300) && gl_extensions.EXT_shader_framebuffer_fetch) {
WRITE(p, "#extension GL_EXT_shader_framebuffer_fetch : require\n");
lastFragData = "fragColor0";
} else if (gl_extensions.EXT_shader_framebuffer_fetch) {
WRITE(p, "#extension GL_EXT_shader_framebuffer_fetch : require\n");
lastFragData = "gl_LastFragData[0]";
} else if (gl_extensions.NV_shader_framebuffer_fetch) {
// GL_NV_shader_framebuffer_fetch is available on mobile platform and ES 2.0 only but not on desktop.
WRITE(p, "#extension GL_NV_shader_framebuffer_fetch : require\n");
lastFragData = "gl_LastFragData[0]";
} else if (gl_extensions.ARM_shader_framebuffer_fetch) {
WRITE(p, "#extension GL_ARM_shader_framebuffer_fetch : require\n");
lastFragData = "gl_LastFragColorARM";
}
}
WRITE(p, "precision lowp float;\n");
} else {
if (!gl_extensions.ForceGL2 || gl_extensions.IsCoreContext) {
if (gl_extensions.VersionGEThan(3, 3, 0)) {
fragColor0 = "fragColor0";
texture = "texture";
glslES30 = true;
bitwiseOps = true;
texelFetch = "texelFetch";
WRITE(p, "#version 330\n");
} else if (gl_extensions.VersionGEThan(3, 0, 0)) {
fragColor0 = "fragColor0";
bitwiseOps = true;
texelFetch = "texelFetch";
WRITE(p, "#version 130\n");
if (gl_extensions.EXT_gpu_shader4) {
WRITE(p, "#extension GL_EXT_gpu_shader4 : enable\n");
}
} else {
WRITE(p, "#version 110\n");
if (gl_extensions.EXT_gpu_shader4) {
WRITE(p, "#extension GL_EXT_gpu_shader4 : enable\n");
bitwiseOps = true;
texelFetch = "texelFetch2D";
}
}
}
// We remove these everywhere - GL4, GL3, Mac-forced-GL2, etc.
WRITE(p, "#define lowp\n");
WRITE(p, "#define mediump\n");
WRITE(p, "#define highp\n");
}
if (glslES30 || gl_extensions.IsCoreContext) {
varying = "in";
}
bool lmode = id.Bit(FS_BIT_LMODE);
bool doTexture = id.Bit(FS_BIT_DO_TEXTURE);
bool enableFog = id.Bit(FS_BIT_ENABLE_FOG);
bool enableAlphaTest = id.Bit(FS_BIT_ALPHA_TEST);
bool alphaTestAgainstZero = id.Bit(FS_BIT_ALPHA_AGAINST_ZERO);
bool testForceToZero = id.Bit(FS_BIT_TEST_DISCARD_TO_ZERO);
bool enableColorTest = id.Bit(FS_BIT_COLOR_TEST);
bool colorTestAgainstZero = id.Bit(FS_BIT_COLOR_AGAINST_ZERO);
bool enableColorDoubling = id.Bit(FS_BIT_COLOR_DOUBLE);
bool doTextureProjection = id.Bit(FS_BIT_DO_TEXTURE_PROJ);
bool doTextureAlpha = id.Bit(FS_BIT_TEXALPHA);
bool doFlatShading = id.Bit(FS_BIT_FLATSHADE);
bool shaderDepal = id.Bit(FS_BIT_SHADER_DEPAL);
GEComparison alphaTestFunc = (GEComparison)id.Bits(FS_BIT_ALPHA_TEST_FUNC, 3);
GEComparison colorTestFunc = (GEComparison)id.Bits(FS_BIT_COLOR_TEST_FUNC, 2);
bool needShaderTexClamp = id.Bit(FS_BIT_SHADER_TEX_CLAMP);
GETexFunc texFunc = (GETexFunc)id.Bits(FS_BIT_TEXFUNC, 3);
bool textureAtOffset = id.Bit(FS_BIT_TEXTURE_AT_OFFSET);
ReplaceBlendType replaceBlend = static_cast<ReplaceBlendType>(id.Bits(FS_BIT_REPLACE_BLEND, 3));
GEBlendSrcFactor replaceBlendFuncA = (GEBlendSrcFactor)id.Bits(FS_BIT_BLENDFUNC_A, 4);
GEBlendDstFactor replaceBlendFuncB = (GEBlendDstFactor)id.Bits(FS_BIT_BLENDFUNC_B, 4);
GEBlendMode replaceBlendEq = (GEBlendMode)id.Bits(FS_BIT_BLENDEQ, 3);
bool isModeClear = id.Bit(FS_BIT_CLEARMODE);
if (shaderDepal && gl_extensions.IsGLES) {
WRITE(p, "precision highp int;\n");
}
const char *shading = "";
if (glslES30)
shading = doFlatShading ? "flat" : "";
if (doTexture)
WRITE(p, "uniform sampler2D tex;\n");
if (!isModeClear && replaceBlend > REPLACE_BLEND_STANDARD) {
*uniformMask |= DIRTY_SHADERBLEND;
if (!gstate_c.Supports(GPU_SUPPORTS_ANY_FRAMEBUFFER_FETCH) && replaceBlend == REPLACE_BLEND_COPY_FBO) {
if (!texelFetch) {
WRITE(p, "uniform vec2 u_fbotexSize;\n");
}
WRITE(p, "uniform sampler2D fbotex;\n");
}
if (replaceBlendFuncA >= GE_SRCBLEND_FIXA) {
WRITE(p, "uniform vec3 u_blendFixA;\n");
}
if (replaceBlendFuncB >= GE_DSTBLEND_FIXB) {
WRITE(p, "uniform vec3 u_blendFixB;\n");
}
}
if (needShaderTexClamp && doTexture) {
*uniformMask |= DIRTY_TEXCLAMP;
WRITE(p, "uniform vec4 u_texclamp;\n");
if (id.Bit(FS_BIT_TEXTURE_AT_OFFSET)) {
WRITE(p, "uniform vec2 u_texclampoff;\n");
}
}
if (enableAlphaTest || enableColorTest) {
if (g_Config.bFragmentTestCache) {
WRITE(p, "uniform sampler2D testtex;\n");
} else {
*uniformMask |= DIRTY_ALPHACOLORREF;
WRITE(p, "uniform vec4 u_alphacolorref;\n");
if (bitwiseOps && ((enableColorTest && !colorTestAgainstZero) || (enableAlphaTest && !alphaTestAgainstZero))) {
*uniformMask |= DIRTY_ALPHACOLORMASK;
WRITE(p, "uniform ivec4 u_alphacolormask;\n");
}
}
}
if (shaderDepal) {
WRITE(p, "uniform sampler2D pal;\n");
WRITE(p, "uniform int u_depal;\n");
*uniformMask |= DIRTY_DEPAL;
}
StencilValueType replaceAlphaWithStencilType = (StencilValueType)id.Bits(FS_BIT_REPLACE_ALPHA_WITH_STENCIL_TYPE, 4);
if (stencilToAlpha && replaceAlphaWithStencilType == STENCIL_VALUE_UNIFORM) {
*uniformMask |= DIRTY_STENCILREPLACEVALUE;
WRITE(p, "uniform float u_stencilReplaceValue;\n");
}
if (doTexture && texFunc == GE_TEXFUNC_BLEND) {
*uniformMask |= DIRTY_TEXENV;
WRITE(p, "uniform vec3 u_texenv;\n");
}
WRITE(p, "%s %s vec4 v_color0;\n", shading, varying);
if (lmode)
WRITE(p, "%s %s vec3 v_color1;\n", shading, varying);
if (enableFog) {
*uniformMask |= DIRTY_FOGCOLOR;
WRITE(p, "uniform vec3 u_fogcolor;\n");
WRITE(p, "%s %s float v_fogdepth;\n", varying, highpFog ? "highp" : "mediump");
}
if (doTexture) {
WRITE(p, "%s %s vec3 v_texcoord;\n", varying, highpTexcoord ? "highp" : "mediump");
}
if (!g_Config.bFragmentTestCache) {
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_IMGTEC) {
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 && !colorTestAgainstZero) {
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_IMGTEC) {
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 (!strcmp(fragColor0, "fragColor0")) {
const char *qualifierColor0 = "out";
if (lastFragData && !strcmp(lastFragData, fragColor0)) {
qualifierColor0 = "inout";
}
// Output the output color definitions.
if (stencilToAlpha == REPLACE_ALPHA_DUALSOURCE) {
WRITE(p, "%s vec4 fragColor0;\n", qualifierColor0);
WRITE(p, "out vec4 fragColor1;\n");
} else {
WRITE(p, "%s vec4 fragColor0;\n", qualifierColor0);
}
}
// PowerVR needs a custom modulo function. For some reason, this has far higher precision than the builtin one.
if ((gl_extensions.bugs & BUG_PVR_SHADER_PRECISION_BAD) && needShaderTexClamp) {
WRITE(p, "float mymod(float a, float b) { return a - b * floor(a / b); }\n");
}
WRITE(p, "void main() {\n");
if (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 (doTexture) {
const char *texcoord = "v_texcoord";
// TODO: Not sure the right way to do this for projection.
// This path destroys resolution on older PowerVR no matter what I do if projection is needed,
// so we disable it on SGX 540 and lesser, and live with the consequences.
bool terriblePrecision = (gl_extensions.bugs & BUG_PVR_SHADER_PRECISION_TERRIBLE) != 0;
bool clampDisabled = doTextureProjection && terriblePrecision;
// Also with terrible precision we can't do wrapping without destroying the image. See #9189
if (terriblePrecision && (!id.Bit(FS_BIT_CLAMP_S) || !id.Bit(FS_BIT_CLAMP_T))) {
clampDisabled = true;
}
if (needShaderTexClamp && !clampDisabled) {
// 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.x / v_texcoord.z)";
vcoord = "(v_texcoord.y / v_texcoord.z)";
}
std::string modulo = (gl_extensions.bugs & BUG_PVR_SHADER_PRECISION_BAD) ? "mymod" : "mod";
if (id.Bit(FS_BIT_CLAMP_S)) {
ucoord = "clamp(" + ucoord + ", u_texclamp.z, u_texclamp.x - u_texclamp.z)";
} else {
ucoord = modulo + "(" + ucoord + ", u_texclamp.x)";
}
if (id.Bit(FS_BIT_CLAMP_T)) {
vcoord = "clamp(" + vcoord + ", u_texclamp.w, u_texclamp.y - u_texclamp.w)";
} else {
vcoord = modulo + "(" + vcoord + ", u_texclamp.y)";
}
if (textureAtOffset) {
ucoord = "(" + ucoord + " + u_texclampoff.x)";
vcoord = "(" + vcoord + " + u_texclampoff.y)";
}
WRITE(p, " vec2 fixedcoord = vec2(%s, %s);\n", ucoord.c_str(), vcoord.c_str());
texcoord = "fixedcoord";
// We already projected it.
doTextureProjection = false;
}
if (!shaderDepal) {
if (doTextureProjection) {
WRITE(p, " vec4 t = %sProj(tex, %s);\n", texture, texcoord);
} else {
WRITE(p, " vec4 t = %s(tex, %s.xy);\n", texture, texcoord);
}
} else {
if (doTextureProjection) {
// We don't use textureProj because we need better control and it's probably not much of a savings anyway.
// However it is good for precision on older hardware like PowerVR.
WRITE(p, " vec2 uv = %s.xy/%s.z;\n vec2 uv_round;\n", texcoord, texcoord);
} else {
WRITE(p, " vec2 uv = %s.xy;\n vec2 uv_round;\n", texcoord);
}
WRITE(p, " vec2 tsize = vec2(textureSize(tex, 0));\n");
WRITE(p, " vec2 fraction;\n");
WRITE(p, " bool bilinear = (u_depal >> 31) != 0;\n");
WRITE(p, " if (bilinear) {\n");
WRITE(p, " uv_round = uv * tsize - vec2(0.5, 0.5);\n");
WRITE(p, " fraction = fract(uv_round);\n");
WRITE(p, " uv_round = (uv_round - fraction + vec2(0.5, 0.5)) / tsize;\n"); // We want to take our four point samples at pixel centers.
WRITE(p, " } else {\n");
WRITE(p, " uv_round = uv;\n");
WRITE(p, " }\n");
WRITE(p, " vec4 t = %s(tex, uv_round);\n", texture);
WRITE(p, " vec4 t1 = %sOffset(tex, uv_round, ivec2(1, 0));\n", texture);
WRITE(p, " vec4 t2 = %sOffset(tex, uv_round, ivec2(0, 1));\n", texture);
WRITE(p, " vec4 t3 = %sOffset(tex, uv_round, ivec2(1, 1));\n", texture);
WRITE(p, " int depalMask = (u_depal & 0xFF);\n");
WRITE(p, " int depalShift = ((u_depal >> 8) & 0xFF);\n");
WRITE(p, " int depalOffset = (((u_depal >> 16) & 0xFF) << 4);\n");
WRITE(p, " int depalFmt = ((u_depal >> 24) & 0x3);\n");
WRITE(p, " ivec4 col; int index0; int index1; int index2; int index3;\n");
WRITE(p, " switch (depalFmt) {\n"); // We might want to include fmt in the shader ID if this is a performance issue.
WRITE(p, " case 0:\n"); // 565
WRITE(p, " col = ivec4(t.rgb * vec3(31.99, 63.99, 31.99), 0);\n");
WRITE(p, " index0 = (col.b << 11) | (col.g << 5) | (col.r);\n");
WRITE(p, " if (bilinear) {\n");
WRITE(p, " col = ivec4(t1.rgb * vec3(31.99, 63.99, 31.99), 0);\n");
WRITE(p, " index1 = (col.b << 11) | (col.g << 5) | (col.r);\n");
WRITE(p, " col = ivec4(t2.rgb * vec3(31.99, 63.99, 31.99), 0);\n");
WRITE(p, " index2 = (col.b << 11) | (col.g << 5) | (col.r);\n");
WRITE(p, " col = ivec4(t3.rgb * vec3(31.99, 63.99, 31.99), 0);\n");
WRITE(p, " index3 = (col.b << 11) | (col.g << 5) | (col.r);\n");
WRITE(p, " }\n");
WRITE(p, " break;\n");
WRITE(p, " case 1:\n"); // 5551
WRITE(p, " col = ivec4(t.rgba * vec4(31.99, 31.99, 31.99, 1.0));\n");
WRITE(p, " index0 = (col.a << 15) | (col.b << 10) | (col.g << 5) | (col.r);\n");
WRITE(p, " if (bilinear) {\n");
WRITE(p, " col = ivec4(t1.rgba * vec4(31.99, 31.99, 31.99, 1.0));\n");
WRITE(p, " index1 = (col.a << 15) | (col.b << 10) | (col.g << 5) | (col.r);\n");
WRITE(p, " col = ivec4(t2.rgba * vec4(31.99, 31.99, 31.99, 1.0));\n");
WRITE(p, " index2 = (col.a << 15) | (col.b << 10) | (col.g << 5) | (col.r);\n");
WRITE(p, " col = ivec4(t3.rgba * vec4(31.99, 31.99, 31.99, 1.0));\n");
WRITE(p, " index3 = (col.a << 15) | (col.b << 10) | (col.g << 5) | (col.r);\n");
WRITE(p, " }\n");
WRITE(p, " break;\n");
WRITE(p, " case 2:\n"); // 4444
WRITE(p, " col = ivec4(t.rgba * vec4(15.99, 15.99, 15.99, 15.99));\n");
WRITE(p, " index0 = (col.a << 12) | (col.b << 8) | (col.g << 4) | (col.r);\n");
WRITE(p, " if (bilinear) {\n");
WRITE(p, " col = ivec4(t1.rgba * vec4(15.99, 15.99, 15.99, 15.99));\n");
WRITE(p, " index1 = (col.a << 12) | (col.b << 8) | (col.g << 4) | (col.r);\n");
WRITE(p, " col = ivec4(t2.rgba * vec4(15.99, 15.99, 15.99, 15.99));\n");
WRITE(p, " index2 = (col.a << 12) | (col.b << 8) | (col.g << 4) | (col.r);\n");
WRITE(p, " col = ivec4(t3.rgba * vec4(15.99, 15.99, 15.99, 15.99));\n");
WRITE(p, " index3 = (col.a << 12) | (col.b << 8) | (col.g << 4) | (col.r);\n");
WRITE(p, " }\n");
WRITE(p, " break;\n");
WRITE(p, " case 3:\n"); // 8888
WRITE(p, " col = ivec4(t.rgba * vec4(255.99, 255.99, 255.99, 255.99));\n");
WRITE(p, " index0 = (col.a << 24) | (col.b << 16) | (col.g << 8) | (col.r);\n");
WRITE(p, " if (bilinear) {\n");
WRITE(p, " col = ivec4(t1.rgba * vec4(255.99, 255.99, 255.99, 255.99));\n");
WRITE(p, " index1 = (col.a << 24) | (col.b << 16) | (col.g << 8) | (col.r);\n");
WRITE(p, " col = ivec4(t2.rgba * vec4(255.99, 255.99, 255.99, 255.99));\n");
WRITE(p, " index2 = (col.a << 24) | (col.b << 16) | (col.g << 8) | (col.r);\n");
WRITE(p, " col = ivec4(t3.rgba * vec4(255.99, 255.99, 255.99, 255.99));\n");
WRITE(p, " index3 = (col.a << 24) | (col.b << 16) | (col.g << 8) | (col.r);\n");
WRITE(p, " }\n");
WRITE(p, " break;\n");
WRITE(p, " };\n");
WRITE(p, " index0 = ((index0 >> depalShift) & depalMask) | depalOffset;\n");
WRITE(p, " t = texelFetch(pal, ivec2(index0, 0), 0);\n");
WRITE(p, " if (bilinear && !(index0 == index1 && index1 == index2 && index2 == index3)) {\n");
WRITE(p, " index1 = ((index1 >> depalShift) & depalMask) | depalOffset;\n");
WRITE(p, " index2 = ((index2 >> depalShift) & depalMask) | depalOffset;\n");
WRITE(p, " index3 = ((index3 >> depalShift) & depalMask) | depalOffset;\n");
WRITE(p, " t1 = texelFetch(pal, ivec2(index1, 0), 0);\n");
WRITE(p, " t2 = texelFetch(pal, ivec2(index2, 0), 0);\n");
WRITE(p, " t3 = texelFetch(pal, ivec2(index3, 0), 0);\n");
WRITE(p, " t = mix(t, t1, fraction.x);\n");
WRITE(p, " t2 = mix(t2, t3, fraction.x);\n");
WRITE(p, " t = mix(t, t2, fraction.y);\n");
WRITE(p, " }\n");
}
if (texFunc != GE_TEXFUNC_REPLACE || !doTextureAlpha)
WRITE(p, " vec4 p = v_color0;\n");
if (doTextureAlpha) { // texfmt == RGBA
switch (texFunc) {
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 (texFunc) {
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;
}
}
if (enableColorDoubling) {
// This happens before fog is applied.
WRITE(p, " v.rgb = clamp(v.rgb * 2.0, 0.0, 1.0);\n");
}
} else {
// No texture mapping
WRITE(p, " vec4 v = v_color0 %s;\n", secondary);
}
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");
}
// Texture access is at half texels [0.5/256, 255.5/256], but colors are normalized [0, 255].
// So we have to scale to account for the difference.
std::string alphaTestXCoord = "0";
if (g_Config.bFragmentTestCache) {
if (enableColorTest && !colorTestAgainstZero) {
WRITE(p, " vec4 vScale256 = v * %f + %f;\n", 255.0 / 256.0, 0.5 / 256.0);
alphaTestXCoord = "vScale256.a";
} else if (enableAlphaTest && !alphaTestAgainstZero) {
char temp[64];
snprintf(temp, sizeof(temp), "v.a * %f + %f", 255.0 / 256.0, 0.5 / 256.0);
alphaTestXCoord = temp;
}
}
const char *discardStatement = testForceToZero ? "v.a = 0.0;" : "discard;";
if (enableAlphaTest) {
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) %s\n", discardStatement);
} else if (alphaTestFunc != GE_COMP_NEVER) {
// Anything else is a test for == 0. Happens sometimes, actually...
WRITE(p, " if (v.a > 0.002) %s\n", discardStatement);
} 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, " %s\n", discardStatement);
}
} else if (g_Config.bFragmentTestCache) {
WRITE(p, " float aResult = %s(testtex, vec2(%s, 0)).a;\n", texture, alphaTestXCoord.c_str());
WRITE(p, " if (aResult < 0.5) %s\n", discardStatement);
} else {
const char *alphaTestFuncs[] = { "#", "#", " != ", " == ", " >= ", " > ", " <= ", " < " };
if (alphaTestFuncs[alphaTestFunc][0] != '#') {
if (bitwiseOps) {
WRITE(p, " if ((roundAndScaleTo255i(v.a) & u_alphacolormask.a) %s int(u_alphacolorref.a)) %s\n", alphaTestFuncs[alphaTestFunc], discardStatement);
} else if (gl_extensions.gpuVendor == GPU_VENDOR_IMGTEC) {
// 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) %s\n", alphaTestFuncs[alphaTestFunc], discardStatement);
}
} else {
WRITE(p, " if (roundAndScaleTo255f(v.a) %s u_alphacolorref.a) %s\n", alphaTestFuncs[alphaTestFunc], discardStatement);
}
} else {
// This means NEVER. See above.
WRITE(p, " %s\n", discardStatement);
}
}
}
if (enableColorTest) {
if (colorTestAgainstZero) {
// When testing against 0 (common), we can avoid some math.
// 0.002 is approximately half of 1.0 / 255.0.
if (colorTestFunc == GE_COMP_NOTEQUAL) {
WRITE(p, " if (v.r < 0.002 && v.g < 0.002 && v.b < 0.002) %s\n", discardStatement);
} else if (colorTestFunc != GE_COMP_NEVER) {
// Anything else is a test for == 0.
WRITE(p, " if (v.r > 0.002 || v.g > 0.002 || v.b > 0.002) %s\n", discardStatement);
} 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, " %s\n", discardStatement);
}
} else if (g_Config.bFragmentTestCache) {
WRITE(p, " float rResult = %s(testtex, vec2(vScale256.r, 0)).r;\n", texture);
WRITE(p, " float gResult = %s(testtex, vec2(vScale256.g, 0)).g;\n", texture);
WRITE(p, " float bResult = %s(testtex, vec2(vScale256.b, 0)).b;\n", texture);
if (colorTestFunc == GE_COMP_EQUAL) {
// Equal means all parts must be equal (so discard if any is not.)
WRITE(p, " if (rResult < 0.5 || gResult < 0.5 || bResult < 0.5) %s\n", discardStatement);
} else {
// Not equal means any part must be not equal.
WRITE(p, " if (rResult < 0.5 && gResult < 0.5 && bResult < 0.5) %s\n", discardStatement);
}
} else {
const char *colorTestFuncs[] = { "#", "#", " != ", " == " };
if (colorTestFuncs[colorTestFunc][0] != '#') {
if (bitwiseOps) {
// Apparently GLES3 does not support vector bitwise ops.
WRITE(p, " ivec3 v_scaled = roundAndScaleTo255iv(v.rgb);\n");
const char *maskedFragColor = "ivec3(v_scaled.r & u_alphacolormask.r, v_scaled.g & u_alphacolormask.g, v_scaled.b & u_alphacolormask.b)";
const char *maskedColorRef = "ivec3(int(u_alphacolorref.r) & u_alphacolormask.r, int(u_alphacolorref.g) & u_alphacolormask.g, int(u_alphacolorref.b) & u_alphacolormask.b)";
WRITE(p, " if (%s %s %s) %s\n", maskedFragColor, colorTestFuncs[colorTestFunc], maskedColorRef, discardStatement);
} else if (gl_extensions.gpuVendor == GPU_VENDOR_IMGTEC) {
WRITE(p, " if (roundTo255thv(v.rgb) %s u_alphacolorref.rgb) %s\n", colorTestFuncs[colorTestFunc], discardStatement);
} else {
WRITE(p, " if (roundAndScaleTo255v(v.rgb) %s u_alphacolorref.rgb) %s\n", colorTestFuncs[colorTestFunc], discardStatement);
}
} else {
WRITE(p, " %s\n", discardStatement);
}
}
}
if (replaceBlend == REPLACE_BLEND_2X_SRC) {
WRITE(p, " v.rgb = v.rgb * 2.0;\n");
}
if (replaceBlend == REPLACE_BLEND_PRE_SRC || replaceBlend == REPLACE_BLEND_PRE_SRC_2X_ALPHA) {
const char *srcFactor = "ERROR";
switch (replaceBlendFuncA) {
case GE_SRCBLEND_DSTCOLOR: srcFactor = "ERROR"; break;
case GE_SRCBLEND_INVDSTCOLOR: srcFactor = "ERROR"; 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 = "ERROR"; break;
case GE_SRCBLEND_INVDSTALPHA: srcFactor = "ERROR"; break;
case GE_SRCBLEND_DOUBLESRCALPHA: srcFactor = "vec3(v.a * 2.0)"; break;
case GE_SRCBLEND_DOUBLEINVSRCALPHA: srcFactor = "vec3(1.0 - v.a * 2.0)"; break;
// PRE_SRC for REPLACE_BLEND_PRE_SRC_2X_ALPHA means "double the src."
// It's close to the same, but clamping can still be an issue.
case GE_SRCBLEND_DOUBLEDSTALPHA: srcFactor = "vec3(2.0)"; break;
case GE_SRCBLEND_DOUBLEINVDSTALPHA: srcFactor = "ERROR"; break;
case GE_SRCBLEND_FIXA: srcFactor = "u_blendFixA"; break;
default: srcFactor = "u_blendFixA"; break;
}
WRITE(p, " v.rgb = v.rgb * %s;\n", srcFactor);
}
if (replaceBlend == REPLACE_BLEND_COPY_FBO) {
// If we have NV_shader_framebuffer_fetch / EXT_shader_framebuffer_fetch, we skip the blit.
// We can just read the prev value more directly.
if (gstate_c.Supports(GPU_SUPPORTS_ANY_FRAMEBUFFER_FETCH)) {
WRITE(p, " lowp vec4 destColor = %s;\n", lastFragData);
} else if (!texelFetch) {
WRITE(p, " lowp vec4 destColor = %s(fbotex, gl_FragCoord.xy * u_fbotexSize.xy);\n", texture);
} else {
WRITE(p, " lowp vec4 destColor = %s(fbotex, ivec2(gl_FragCoord.x, gl_FragCoord.y), 0);\n", texelFetch);
}
const char *srcFactor = "vec3(1.0)";
const char *dstFactor = "vec3(0.0)";
switch (replaceBlendFuncA) {
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;
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;
default: srcFactor = "u_blendFixA"; break;
}
switch (replaceBlendFuncB) {
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;
default: srcFactor = "u_blendFixB"; break;
}
switch (replaceBlendEq) {
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", dstFactor, srcFactor);
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;
}
}
if (replaceBlend == REPLACE_BLEND_2X_ALPHA || replaceBlend == REPLACE_BLEND_PRE_SRC_2X_ALPHA) {
WRITE(p, " v.a = v.a * 2.0;\n");
}
}
std::string replacedAlpha = "0.0";
char replacedAlphaTemp[64] = "";
if (stencilToAlpha != REPLACE_ALPHA_NO) {
switch (replaceAlphaWithStencilType) {
case STENCIL_VALUE_UNIFORM:
replacedAlpha = "u_stencilReplaceValue";
break;
case STENCIL_VALUE_ZERO:
replacedAlpha = "0.0";
break;
case STENCIL_VALUE_ONE:
case STENCIL_VALUE_INVERT:
// In invert, we subtract by one, but we want to output one here.
replacedAlpha = "1.0";
break;
case STENCIL_VALUE_INCR_4:
case STENCIL_VALUE_DECR_4:
// We're adding/subtracting, just by the smallest value in 4-bit.
snprintf(replacedAlphaTemp, sizeof(replacedAlphaTemp), "%f", 1.0 / 15.0);
replacedAlpha = replacedAlphaTemp;
break;
case STENCIL_VALUE_INCR_8:
case STENCIL_VALUE_DECR_8:
// We're adding/subtracting, just by the smallest value in 8-bit.
snprintf(replacedAlphaTemp, sizeof(replacedAlphaTemp), "%f", 1.0 / 255.0);
replacedAlpha = replacedAlphaTemp;
break;
case STENCIL_VALUE_KEEP:
// Do nothing. We'll mask out the alpha using color mask.
break;
}
}
switch (stencilToAlpha) {
case REPLACE_ALPHA_DUALSOURCE:
WRITE(p, " %s = vec4(v.rgb, %s);\n", fragColor0, replacedAlpha.c_str());
WRITE(p, " %s = vec4(0.0, 0.0, 0.0, v.a);\n", fragColor1);
break;
case REPLACE_ALPHA_YES:
WRITE(p, " %s = vec4(v.rgb, %s);\n", fragColor0, replacedAlpha.c_str());
break;
case REPLACE_ALPHA_NO:
WRITE(p, " %s = v;\n", fragColor0);
break;
default:
ERROR_LOG(G3D, "Bad stencil-to-alpha type, corrupt ID?");
return false;
}
LogicOpReplaceType replaceLogicOpType = (LogicOpReplaceType)id.Bits(FS_BIT_REPLACE_LOGIC_OP_TYPE, 2);
switch (replaceLogicOpType) {
case LOGICOPTYPE_ONE:
WRITE(p, " %s.rgb = vec3(1.0, 1.0, 1.0);\n", fragColor0);
break;
case LOGICOPTYPE_INVERT:
WRITE(p, " %s.rgb = vec3(1.0, 1.0, 1.0) - %s.rgb;\n", fragColor0, fragColor0);
break;
case LOGICOPTYPE_NORMAL:
break;
default:
ERROR_LOG(G3D, "Bad logic op type, corrupt ID?");
return false;
}
#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
if (gstate_c.Supports(GPU_ROUND_FRAGMENT_DEPTH_TO_16BIT)) {
const double scale = DepthSliceFactor() * 65535.0;
WRITE(p, " highp float z = gl_FragCoord.z;\n");
if (gstate_c.Supports(GPU_SUPPORTS_ACCURATE_DEPTH)) {
// We center the depth with an offset, but only its fraction matters.
// When (DepthSliceFactor() - 1) is odd, it will be 0.5, otherwise 0.
if (((int)(DepthSliceFactor() - 1.0f) & 1) == 1) {
WRITE(p, " z = (floor((z * %f) - (1.0 / 2.0)) + (1.0 / 2.0)) * (1.0 / %f);\n", scale, scale);
} else {
WRITE(p, " z = floor(z * %f) * (1.0 / %f);\n", scale, scale);
}
} else {
WRITE(p, " z = (1.0/65535.0) * floor(z * 65535.0);\n");
}
WRITE(p, " gl_FragDepth = z;\n");
}
WRITE(p, "}\n");
return true;
}
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