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ppsspp/GPU/Common/FragmentShaderGenerator.cpp

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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 "Common/GPU/ShaderWriter.h"
#include "Common/GPU/thin3d.h"
#include "Core/Reporting.h"
#include "Core/Config.h"
#include "GPU/Common/GPUStateUtils.h"
#include "GPU/Common/ShaderId.h"
#include "GPU/Common/ShaderUniforms.h"
#include "GPU/Common/FragmentShaderGenerator.h"
#include "GPU/ge_constants.h"
#include "GPU/GPUState.h"
#define WRITE(p, ...) p.F(__VA_ARGS__)
bool GenerateFragmentShader(const FShaderID &id, char *buffer, const ShaderLanguageDesc &compat, Draw::Bugs bugs, uint64_t *uniformMask, std::string *errorString) {
*uniformMask = 0;
errorString->clear();
bool highpFog = false;
bool highpTexcoord = false;
bool enableFragmentTestCache = g_Config.bFragmentTestCache && ShaderLanguageIsOpenGL(compat.shaderLanguage);
if (compat.gles) {
// 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;
}
bool texture3D = id.Bit(FS_BIT_3D_TEXTURE);
ReplaceAlphaType stencilToAlpha = static_cast<ReplaceAlphaType>(id.Bits(FS_BIT_STENCIL_TO_ALPHA, 2));
std::vector<const char*> gl_exts;
if (ShaderLanguageIsOpenGL(compat.shaderLanguage)) {
if (stencilToAlpha == REPLACE_ALPHA_DUALSOURCE && gl_extensions.EXT_blend_func_extended) {
gl_exts.push_back("#extension GL_EXT_blend_func_extended : require");
}
if (gl_extensions.EXT_gpu_shader4) {
gl_exts.push_back("#extension GL_EXT_gpu_shader4 : enable");
}
if (compat.framebufferFetchExtension) {
gl_exts.push_back(compat.framebufferFetchExtension);
}
if (gl_extensions.OES_texture_3D && texture3D) {
gl_exts.push_back("#extension GL_OES_texture_3D: enable");
}
}
ShaderWriter p(buffer, compat, ShaderStage::Fragment, gl_exts.data(), gl_exts.size());
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 flatBug = bugs.Has(Draw::Bugs::BROKEN_FLAT_IN_SHADER) && g_Config.bVendorBugChecksEnabled;
bool doFlatShading = id.Bit(FS_BIT_FLATSHADE) && !flatBug;
bool shaderDepal = id.Bit(FS_BIT_SHADER_DEPAL) && !texture3D; // combination with texture3D not supported. Enforced elsewhere too.
bool bgraTexture = id.Bit(FS_BIT_BGRA_TEXTURE);
bool colorWriteMask = id.Bit(FS_BIT_COLOR_WRITEMASK) && compat.bitwiseOps;
bool colorToDepth = id.Bit(FS_BIT_COLOR_TO_DEPTH);
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));
bool blueToAlpha = false;
if (replaceBlend == ReplaceBlendType::REPLACE_BLEND_BLUE_TO_ALPHA) {
blueToAlpha = true;
}
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);
StencilValueType replaceAlphaWithStencilType = (StencilValueType)id.Bits(FS_BIT_REPLACE_ALPHA_WITH_STENCIL_TYPE, 4);
bool isModeClear = id.Bit(FS_BIT_CLEARMODE);
const char *shading = "";
if (compat.glslES30 || compat.shaderLanguage == ShaderLanguage::GLSL_VULKAN)
shading = doFlatShading ? "flat" : "";
bool useDiscardStencilBugWorkaround = id.Bit(FS_BIT_NO_DEPTH_CANNOT_DISCARD_STENCIL);
bool readFramebuffer = replaceBlend == REPLACE_BLEND_COPY_FBO || colorWriteMask;
bool readFramebufferTex = readFramebuffer && !gstate_c.Supports(GPU_SUPPORTS_ANY_FRAMEBUFFER_FETCH);
bool needFragCoord = readFramebuffer || gstate_c.Supports(GPU_ROUND_FRAGMENT_DEPTH_TO_16BIT);
bool writeDepth = gstate_c.Supports(GPU_ROUND_FRAGMENT_DEPTH_TO_16BIT) || colorToDepth;
if (shaderDepal && !doTexture) {
*errorString = "depal requires a texture";
return false;
}
if (readFramebuffer && compat.shaderLanguage == HLSL_D3D9) {
*errorString = "Framebuffer read not yet supported in HLSL D3D9";
return false;
}
if (compat.shaderLanguage == ShaderLanguage::GLSL_VULKAN) {
if (colorToDepth) {
WRITE(p, "precision highp int;\n");
WRITE(p, "precision highp float;\n");
}
if (useDiscardStencilBugWorkaround && !gstate_c.Supports(GPU_ROUND_FRAGMENT_DEPTH_TO_16BIT)) {
WRITE(p, "layout (depth_unchanged) out float gl_FragDepth;\n");
}
WRITE(p, "layout (std140, set = 0, binding = 3) uniform baseUBO {\n%s};\n", ub_baseStr);
if (doTexture) {
WRITE(p, "layout (binding = 0) uniform %s tex;\n", texture3D ? "sampler3D" : "sampler2D");
}
if (readFramebufferTex) {
WRITE(p, "layout (binding = 1) uniform sampler2D fbotex;\n");
}
if (shaderDepal) {
WRITE(p, "layout (binding = 2) uniform sampler2D pal;\n");
}
// Note: the precision qualifiers must match the vertex shader!
WRITE(p, "layout (location = 1) %s in lowp vec4 v_color0;\n", shading);
if (lmode)
WRITE(p, "layout (location = 2) %s in lowp vec3 v_color1;\n", shading);
if (enableFog) {
WRITE(p, "layout (location = 3) in highp float v_fogdepth;\n");
}
if (doTexture) {
WRITE(p, "layout (location = 0) in highp vec3 v_texcoord;\n");
}
if (enableAlphaTest && !alphaTestAgainstZero) {
WRITE(p, "int roundAndScaleTo255i(in highp float x) { return int(floor(x * 255.0 + 0.5)); }\n");
}
if (enableColorTest && !colorTestAgainstZero) {
WRITE(p, "ivec3 roundAndScaleTo255iv(in highp vec3 x) { return ivec3(floor(x * 255.0 + 0.5)); }\n");
}
WRITE(p, "layout (location = 0, index = 0) out vec4 fragColor0;\n");
if (stencilToAlpha == REPLACE_ALPHA_DUALSOURCE) {
WRITE(p, "layout (location = 0, index = 1) out vec4 fragColor1;\n");
}
} else if (compat.shaderLanguage == HLSL_D3D11 || compat.shaderLanguage == HLSL_D3D9) {
if (compat.shaderLanguage == HLSL_D3D9) {
if (doTexture)
WRITE(p, "sampler tex : register(s0);\n");
if (readFramebufferTex) {
WRITE(p, "vec2 u_fbotexSize : register(c%i);\n", CONST_PS_FBOTEXSIZE);
WRITE(p, "sampler fbotex : register(s1);\n");
}
if (replaceBlend > REPLACE_BLEND_STANDARD) {
if (replaceBlendFuncA >= GE_SRCBLEND_FIXA) {
WRITE(p, "float3 u_blendFixA : register(c%i);\n", CONST_PS_BLENDFIXA);
}
if (replaceBlendFuncB >= GE_DSTBLEND_FIXB) {
WRITE(p, "float3 u_blendFixB : register(c%i);\n", CONST_PS_BLENDFIXB);
}
}
if (needShaderTexClamp && doTexture) {
WRITE(p, "vec4 u_texclamp : register(c%i);\n", CONST_PS_TEXCLAMP);
if (textureAtOffset) {
WRITE(p, "vec2 u_texclampoff : register(c%i);\n", CONST_PS_TEXCLAMPOFF);
}
}
if (enableAlphaTest || enableColorTest) {
WRITE(p, "vec4 u_alphacolorref : register(c%i);\n", CONST_PS_ALPHACOLORREF);
WRITE(p, "vec4 u_alphacolormask : register(c%i);\n", CONST_PS_ALPHACOLORMASK);
}
if (stencilToAlpha && replaceAlphaWithStencilType == STENCIL_VALUE_UNIFORM) {
WRITE(p, "float u_stencilReplaceValue : register(c%i);\n", CONST_PS_STENCILREPLACE);
}
if (doTexture && texFunc == GE_TEXFUNC_BLEND) {
WRITE(p, "float3 u_texenv : register(c%i);\n", CONST_PS_TEXENV);
}
if (enableFog) {
WRITE(p, "float3 u_fogcolor : register(c%i);\n", CONST_PS_FOGCOLOR);
}
if (texture3D) {
WRITE(p, "float u_mipBias : register(c%i);\n", CONST_PS_MIPBIAS);
}
} else {
WRITE(p, "SamplerState samp : register(s0);\n");
if (texture3D) {
WRITE(p, "Texture3D<vec4> tex : register(t0);\n");
} else {
WRITE(p, "Texture2D<vec4> tex : register(t0);\n");
}
if (readFramebufferTex) {
// No sampler required, we Load
WRITE(p, "Texture2D<vec4> fboTex : register(t1);\n");
}
WRITE(p, "cbuffer base : register(b0) {\n%s};\n", ub_baseStr);
if (shaderDepal) {
WRITE(p, "float2 textureSize(Texture2D<float4> tex, int mip) { float2 size; tex.GetDimensions(size.x, size.y); return size; }\n");
}
}
if (enableAlphaTest) {
if (compat.shaderLanguage == HLSL_D3D11) {
WRITE(p, "int roundAndScaleTo255i(float x) { return int(floor(x * 255.0f + 0.5f)); }\n");
} else {
// D3D11 level 9 gets to take this path.
WRITE(p, "float roundAndScaleTo255f(float x) { return floor(x * 255.0f + 0.5f); }\n");
}
}
if (enableColorTest) {
if (compat.shaderLanguage == HLSL_D3D11) {
WRITE(p, "uvec3 roundAndScaleTo255iv(float3 x) { return (floor(x * 255.0f + 0.5f)); }\n");
} else {
WRITE(p, "vec3 roundAndScaleTo255v(float3 x) { return floor(x * 255.0f + 0.5f); }\n");
}
}
WRITE(p, "struct PS_IN {\n");
if (doTexture) {
WRITE(p, " vec3 v_texcoord: TEXCOORD0;\n");
}
const char *colorInterpolation = doFlatShading && compat.shaderLanguage == HLSL_D3D11 ? "nointerpolation " : "";
WRITE(p, " %svec4 v_color0: COLOR0;\n", colorInterpolation);
if (lmode) {
WRITE(p, " vec3 v_color1: COLOR1;\n");
}
if (enableFog) {
WRITE(p, " float v_fogdepth: TEXCOORD1;\n");
}
if (compat.shaderLanguage == HLSL_D3D11 && needFragCoord) {
WRITE(p, " vec4 pixelPos : SV_POSITION;\n");
}
WRITE(p, "};\n");
if (compat.shaderLanguage == HLSL_D3D11) {
WRITE(p, "struct PS_OUT {\n");
if (stencilToAlpha == REPLACE_ALPHA_DUALSOURCE) {
WRITE(p, " vec4 target : SV_Target0;\n");
WRITE(p, " vec4 target1 : SV_Target1;\n");
} else {
WRITE(p, " vec4 target : SV_Target;\n");
}
if (writeDepth) {
WRITE(p, " float depth : SV_Depth;\n");
}
WRITE(p, "};\n");
} else if (compat.shaderLanguage == HLSL_D3D9) {
WRITE(p, "struct PS_OUT {\n");
WRITE(p, " vec4 target : COLOR;\n");
if (writeDepth) {
WRITE(p, " float depth : DEPTH;\n");
}
WRITE(p, "};\n");
}
} else if (ShaderLanguageIsOpenGL(compat.shaderLanguage)) {
if ((shaderDepal || colorWriteMask || colorToDepth) && gl_extensions.IsGLES) {
WRITE(p, "precision highp int;\n");
}
if (doTexture) {
if (texture3D) {
// For whatever reason, a precision specifier is required here.
WRITE(p, "uniform lowp sampler3D tex;\n");
} else {
WRITE(p, "uniform sampler2D tex;\n");
}
}
if (readFramebufferTex) {
if (!compat.texelFetch) {
WRITE(p, "uniform vec2 u_fbotexSize;\n");
}
WRITE(p, "uniform sampler2D fbotex;\n");
}
if (!isModeClear && replaceBlend > REPLACE_BLEND_STANDARD) {
*uniformMask |= DIRTY_SHADERBLEND;
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 (enableFragmentTestCache) {
WRITE(p, "uniform sampler2D testtex;\n");
} else {
*uniformMask |= DIRTY_ALPHACOLORREF;
WRITE(p, "uniform vec4 u_alphacolorref;\n");
if (compat.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 uint u_depal_mask_shift_off_fmt;\n");
*uniformMask |= DIRTY_DEPAL;
}
if (colorWriteMask) {
WRITE(p, "uniform uint u_colorWriteMask;\n");
*uniformMask |= DIRTY_COLORWRITEMASK;
}
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");
}
if (texture3D) {
*uniformMask |= DIRTY_MIPBIAS;
WRITE(p, "uniform float u_mipBias;\n");
}
WRITE(p, "%s %s lowp vec4 v_color0;\n", shading, compat.varying_fs);
if (lmode)
WRITE(p, "%s %s lowp vec3 v_color1;\n", shading, compat.varying_fs);
if (enableFog) {
*uniformMask |= DIRTY_FOGCOLOR;
WRITE(p, "uniform vec3 u_fogcolor;\n");
WRITE(p, "%s %s float v_fogdepth;\n", compat.varying_fs, highpFog ? "highp" : "mediump");
}
if (doTexture) {
WRITE(p, "%s %s vec3 v_texcoord;\n", compat.varying_fs, highpTexcoord ? "highp" : "mediump");
}
if (!enableFragmentTestCache) {
if (enableAlphaTest && !alphaTestAgainstZero) {
if (compat.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 (compat.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(compat.fragColor0, "fragColor0")) {
const char *qualifierColor0 = "out";
if (readFramebuffer && compat.lastFragData && !strcmp(compat.lastFragData, compat.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);
}
}
}
bool hasPackUnorm4x8 = false;
if (compat.shaderLanguage == GLSL_VULKAN) {
hasPackUnorm4x8 = true;
} else if (ShaderLanguageIsOpenGL(compat.shaderLanguage)) {
if (compat.gles) {
hasPackUnorm4x8 = compat.glslVersionNumber >= 310;
} else {
hasPackUnorm4x8 = compat.glslVersionNumber >= 400;
}
}
// Provide implementations of packUnorm4x8 and unpackUnorm4x8 if not available.
if (colorWriteMask && !hasPackUnorm4x8) {
WRITE(p, "uint packUnorm4x8(%svec4 v) {\n", compat.shaderLanguage == GLSL_VULKAN ? "highp " : "");
WRITE(p, " highp vec4 f = clamp(v, 0.0, 1.0);\n");
WRITE(p, " uvec4 u = uvec4(255.0 * f);\n");
WRITE(p, " return u.x | (u.y << 8) | (u.z << 16) | (u.w << 24);\n");
WRITE(p, "}\n");
WRITE(p, "vec4 unpackUnorm4x8(highp uint x) {\n");
WRITE(p, " highp uvec4 u = uvec4(x & 0xFFU, (x >> 8) & 0xFFU, (x >> 16) & 0xFFU, (x >> 24) & 0xFFU);\n");
WRITE(p, " highp vec4 f = vec4(u);\n");
WRITE(p, " return f * (1.0 / 255.0);\n");
WRITE(p, "}\n");
}
// 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");
}
if (compat.shaderLanguage == HLSL_D3D11) {
WRITE(p, "PS_OUT main( PS_IN In ) {\n");
WRITE(p, " PS_OUT outfragment;\n");
if (needFragCoord) {
WRITE(p, " vec4 gl_FragCoord = In.pixelPos;\n");
}
if (writeDepth) {
WRITE(p, " float gl_FragDepth;\n");
}
} else if (compat.shaderLanguage == HLSL_D3D9) {
WRITE(p, "PS_OUT main( PS_IN In ) {\n");
WRITE(p, " PS_OUT outfragment;\n");
WRITE(p, " vec4 target;\n");
if (colorToDepth) {
WRITE(p, " float gl_FragDepth;\n");
}
} else {
WRITE(p, "void main() {\n");
}
if (compat.shaderLanguage == HLSL_D3D11 || compat.shaderLanguage == HLSL_D3D9) {
WRITE(p, " vec4 v_color0 = In.v_color0;\n");
if (lmode)
WRITE(p, " vec3 v_color1 = In.v_color1;\n");
if (enableFog) {
WRITE(p, " float v_fogdepth = In.v_fogdepth;\n");
}
if (doTexture) {
WRITE(p, " vec3 v_texcoord = In.v_texcoord;\n");
}
}
// Two things read from the old framebuffer - shader replacement blending and bit-level masking.
if (readFramebuffer) {
if (compat.shaderLanguage == HLSL_D3D11) {
WRITE(p, " vec4 destColor = fboTex.Load(int3((int)gl_FragCoord.x, (int)gl_FragCoord.y, 0));\n");
} else if (gstate_c.Supports(GPU_SUPPORTS_ANY_FRAMEBUFFER_FETCH)) {
// If we have EXT_shader_framebuffer_fetch / ARM_shader_framebuffer_fetch, we skip the blit.
// We can just read the prev value more directly.
WRITE(p, " lowp vec4 destColor = %s;\n", compat.lastFragData);
} else if (!compat.texelFetch) {
WRITE(p, " lowp vec4 destColor = %s(fbotex, gl_FragCoord.xy * u_fbotexSize.xy);\n", compat.texture);
} else {
WRITE(p, " lowp vec4 destColor = %s(fbotex, ivec2(gl_FragCoord.x, gl_FragCoord.y), 0);\n", compat.texelFetch);
}
}
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) {
char texcoord[64] = "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());
truncate_cpy(texcoord, "fixedcoord");
// We already projected it.
doTextureProjection = false;
}
if (!shaderDepal) {
if (compat.shaderLanguage == HLSL_D3D11) {
if (texture3D) {
if (doTextureProjection) {
WRITE(p, " vec4 t = tex.Sample(samp, vec3(v_texcoord.xy / v_texcoord.z, u_mipBias))%s;\n", bgraTexture ? ".bgra" : "");
} else {
WRITE(p, " vec4 t = tex.Sample(samp, vec3(%s.xy, u_mipBias))%s;\n", texcoord, bgraTexture ? ".bgra" : "");
}
} else {
if (doTextureProjection) {
WRITE(p, " vec4 t = tex.Sample(samp, v_texcoord.xy / v_texcoord.z)%s;\n", bgraTexture ? ".bgra" : "");
} else {
WRITE(p, " vec4 t = tex.Sample(samp, %s.xy)%s;\n", texcoord, bgraTexture ? ".bgra" : "");
}
}
} else if (compat.shaderLanguage == HLSL_D3D9) {
if (texture3D) {
if (doTextureProjection) {
WRITE(p, " vec4 t = tex3Dproj(tex, vec4(v_texcoord.x, v_texcoord.y, u_mipBias, v_texcoord.z))%s;\n", bgraTexture ? ".bgra" : "");
} else {
WRITE(p, " vec4 t = tex3D(tex, vec3(%s.x, %s.y, u_mipBias))%s;\n", texcoord, texcoord, bgraTexture ? ".bgra" : "");
}
} else {
if (doTextureProjection) {
WRITE(p, " vec4 t = tex2Dproj(tex, vec4(v_texcoord.x, v_texcoord.y, 0.0, v_texcoord.z))%s;\n", bgraTexture ? ".bgra" : "");
} else {
WRITE(p, " vec4 t = tex2D(tex, %s.xy)%s;\n", texcoord, bgraTexture ? ".bgra" : "");
}
}
} else {
// Note that here we're relying on the filter to be linear. We would have to otherwise to do two samples and manually filter in Z.
// Let's add that if we run into a case...
if (texture3D) {
if (doTextureProjection) {
WRITE(p, " vec4 t = %sProj(tex, vec4(%s.xy, u_mipBias, %s.z));\n", compat.texture3D, texcoord, texcoord);
} else {
WRITE(p, " vec4 t = %s(tex, vec3(%s.xy, u_mipBias));\n", compat.texture3D, texcoord);
}
} else {
if (doTextureProjection) {
WRITE(p, " vec4 t = %sProj(tex, %s);\n", compat.texture, texcoord);
} else {
WRITE(p, " vec4 t = %s(tex, %s.xy);\n", compat.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).xy);\n");
WRITE(p, " vec2 fraction;\n");
WRITE(p, " bool bilinear = (u_depal_mask_shift_off_fmt >> 31) != 0U;\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, " highp vec4 t = %s(tex, uv_round);\n", compat.texture);
WRITE(p, " highp vec4 t1 = %sOffset(tex, uv_round, ivec2(1, 0));\n", compat.texture);
WRITE(p, " highp vec4 t2 = %sOffset(tex, uv_round, ivec2(0, 1));\n", compat.texture);
WRITE(p, " highp vec4 t3 = %sOffset(tex, uv_round, ivec2(1, 1));\n", compat.texture);
WRITE(p, " uint depalMask = (u_depal_mask_shift_off_fmt & 0xFFU);\n");
WRITE(p, " uint depalShift = (u_depal_mask_shift_off_fmt >> 8) & 0xFFU;\n");
WRITE(p, " uint depalOffset = ((u_depal_mask_shift_off_fmt >> 16) & 0xFFU) << 4;\n");
WRITE(p, " uint depalFmt = (u_depal_mask_shift_off_fmt >> 24) & 0x3U;\n");
WRITE(p, " uvec4 col; uint index0; uint index1; uint index2; uint index3;\n");
WRITE(p, " switch (int(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 = uvec4(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 = uvec4(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 = uvec4(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 = uvec4(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 = uvec4(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 = uvec4(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 = uvec4(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 = uvec4(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 = uvec4(t.rgba * 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 = uvec4(t1.rgba * 15.99);\n");
WRITE(p, " index1 = (col.a << 12) | (col.b << 8) | (col.g << 4) | (col.r);\n");
WRITE(p, " col = uvec4(t2.rgba * 15.99);\n");
WRITE(p, " index2 = (col.a << 12) | (col.b << 8) | (col.g << 4) | (col.r);\n");
WRITE(p, " col = uvec4(t3.rgba * 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 = uvec4(t.rgba * 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 = uvec4(t1.rgba * 255.99);\n");
WRITE(p, " index1 = (col.a << 24) | (col.b << 16) | (col.g << 8) | (col.r);\n");
WRITE(p, " col = uvec4(t2.rgba * 255.99);\n");
WRITE(p, " index2 = (col.a << 24) | (col.b << 16) | (col.g << 8) | (col.r);\n");
WRITE(p, " col = uvec4(t3.rgba * 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");
}
// 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.
char alphaTestXCoord[64] = "0";
if (enableFragmentTestCache) {
if (enableColorTest && !colorTestAgainstZero) {
WRITE(p, " vec4 vScale256 = v * %f + %f;\n", 255.0 / 256.0, 0.5 / 256.0);
truncate_cpy(alphaTestXCoord, "vScale256.a");
} else if (enableAlphaTest && !alphaTestAgainstZero) {
snprintf(alphaTestXCoord, sizeof(alphaTestXCoord), "v.a * %f + %f", 255.0 / 256.0, 0.5 / 256.0);
}
}
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 (enableFragmentTestCache) {
WRITE(p, " float aResult = %s(testtex, vec2(%s, 0)).a;\n", compat.texture, alphaTestXCoord);
WRITE(p, " if (aResult < 0.5) %s\n", discardStatement);
} else {
const char *alphaTestFuncs[] = { "#", "#", " != ", " == ", " >= ", " > ", " <= ", " < " };
if (alphaTestFuncs[alphaTestFunc][0] != '#') {
if (compat.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) {
if (compat.shaderLanguage == GLSL_VULKAN) {
// Old workaround for Adreno driver bug. We could make this the main path actually
// since the math is roughly equivalent given the non-negative inputs.
WRITE(p, " if (v.r + v.g + v.b < 0.002) %s\n", discardStatement);
} else {
WRITE(p, " if (v.r < 0.002 && v.g < 0.002 && v.b < 0.002) %s\n", discardStatement);
}
} else if (colorTestFunc != GE_COMP_NEVER) {
if (compat.shaderLanguage == GLSL_VULKAN) {
// See the GE_COMP_NOTEQUAL case.
WRITE(p, " if (v.r + v.g + v.b > 0.002) %s\n", discardStatement);
} else {
// 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 (enableFragmentTestCache) {
WRITE(p, " float rResult = %s(testtex, vec2(vScale256.r, 0)).r;\n", compat.texture);
WRITE(p, " float gResult = %s(testtex, vec2(vScale256.g, 0)).g;\n", compat.texture);
WRITE(p, " float bResult = %s(testtex, vec2(vScale256.b, 0)).b;\n", compat.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] != '#') {
// TODO: Unify these paths better.
if (compat.shaderLanguage == HLSL_D3D11) {
const char *test = colorTestFuncs[colorTestFunc];
WRITE(p, " uvec3 v_scaled = roundAndScaleTo255iv(v.rgb);\n");
WRITE(p, " uvec3 v_masked = v_scaled & u_alphacolormask.rgb;\n");
WRITE(p, " uvec3 colorTestRef = u_alphacolorref.rgb & u_alphacolormask.rgb;\n");
// We have to test the components separately, or we get incorrect results. See #10629.
WRITE(p, " if (v_masked.r %s colorTestRef.r && v_masked.g %s colorTestRef.g && v_masked.b %s colorTestRef.b) %s\n", test, test, test, discardStatement);
} else if (compat.shaderLanguage == HLSL_D3D9) {
const char *test = colorTestFuncs[colorTestFunc];
// TODO: Use a texture to lookup bitwise ops instead?
WRITE(p, " vec3 colortest = roundAndScaleTo255v(v.rgb);\n");
WRITE(p, " if ((colortest.r %s u_alphacolorref.r) && (colortest.g %s u_alphacolorref.g) && (colortest.b %s u_alphacolorref.b)) %s\n", test, test, test, discardStatement);
} else if (compat.bitwiseOps) {
WRITE(p, " ivec3 v_scaled = roundAndScaleTo255iv(v.rgb);\n");
if (compat.shaderLanguage == GLSL_VULKAN) {
// Apparently GLES3 does not support vector bitwise ops, but Vulkan does?
WRITE(p, " if ((v_scaled & u_alphacolormask.rgb) %s (u_alphacolorref.rgb & u_alphacolormask.rgb)) %s\n", colorTestFuncs[colorTestFunc], discardStatement);
} else {
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");
}
// In some cases we need to replicate the first half of the blend equation here.
// In case of blue-to-alpha, it's since we overwrite alpha with blue before the actual blend equation runs.
if (replaceBlend == REPLACE_BLEND_PRE_SRC || replaceBlend == REPLACE_BLEND_PRE_SRC_2X_ALPHA || replaceBlend == REPLACE_BLEND_BLUE_TO_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 = "splat3(v.a)"; break;
case GE_SRCBLEND_INVSRCALPHA: srcFactor = "splat3(1.0 - v.a)"; break;
case GE_SRCBLEND_DSTALPHA: srcFactor = "ERROR"; break;
case GE_SRCBLEND_INVDSTALPHA: srcFactor = "ERROR"; break;
case GE_SRCBLEND_DOUBLESRCALPHA: srcFactor = "splat3(v.a * 2.0)"; break;
case GE_SRCBLEND_DOUBLEINVSRCALPHA: srcFactor = "splat3(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 = "splat3(2.0)"; break;
case GE_SRCBLEND_DOUBLEINVDSTALPHA: srcFactor = "ERROR"; break;
case GE_SRCBLEND_FIXA: srcFactor = "u_blendFixA"; break;
default: srcFactor = "u_blendFixA"; break;
}
if (!strcmp(srcFactor, "ERROR")) {
*errorString = "Bad replaceblend src factor";
return false;
}
WRITE(p, " v.rgb = v.rgb * %s;\n", srcFactor);
}
if (replaceBlend == REPLACE_BLEND_COPY_FBO) {
const char *srcFactor = nullptr;
const char *dstFactor = nullptr;
switch (replaceBlendFuncA) {
case GE_SRCBLEND_DSTCOLOR: srcFactor = "destColor.rgb"; break;
case GE_SRCBLEND_INVDSTCOLOR: srcFactor = "(splat3(1.0) - destColor.rgb)"; break;
case GE_SRCBLEND_SRCALPHA: srcFactor = "v.aaa"; break;
case GE_SRCBLEND_INVSRCALPHA: srcFactor = "splat3(1.0 - v.a)"; break;
case GE_SRCBLEND_DSTALPHA: srcFactor = "destColor.aaa"; break;
case GE_SRCBLEND_INVDSTALPHA: srcFactor = "(splat3(1.0) - destColor.aaa)"; break;
case GE_SRCBLEND_DOUBLESRCALPHA: srcFactor = "v.aaa * 2.0"; break;
case GE_SRCBLEND_DOUBLEINVSRCALPHA: srcFactor = "(splat3(1.0) - v.aaa * 2.0)"; break;
case GE_SRCBLEND_DOUBLEDSTALPHA: srcFactor = "destColor.aaa * 2.0"; break;
case GE_SRCBLEND_DOUBLEINVDSTALPHA: srcFactor = "(splat3(1.0) - destColor.aaa * 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 = "(splat3(1.0) - v.rgb)"; break;
case GE_DSTBLEND_SRCALPHA: dstFactor = "v.aaa"; break;
case GE_DSTBLEND_INVSRCALPHA: dstFactor = "(splat3(1.0) - v.aaa)"; break;
case GE_DSTBLEND_DSTALPHA: dstFactor = "destColor.aaa"; break;
case GE_DSTBLEND_INVDSTALPHA: dstFactor = "(splat3(1.0) - destColor.aaa)"; break;
case GE_DSTBLEND_DOUBLESRCALPHA: dstFactor = "v.aaa * 2.0"; break;
case GE_DSTBLEND_DOUBLEINVSRCALPHA: dstFactor = "(splat3(1.0) - v.aaa * 2.0)"; break;
case GE_DSTBLEND_DOUBLEDSTALPHA: dstFactor = "destColor.aaa * 2.0"; break;
case GE_DSTBLEND_DOUBLEINVDSTALPHA: dstFactor = "(splat3(1.0) - destColor.aaa * 2.0)"; break;
case GE_DSTBLEND_FIXB: dstFactor = "u_blendFixB"; break;
default: dstFactor = "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;
default:
*errorString = "Bad replace blend eq";
return false;
}
}
if (replaceBlend == REPLACE_BLEND_2X_ALPHA || replaceBlend == REPLACE_BLEND_PRE_SRC_2X_ALPHA) {
WRITE(p, " v.a *= 2.0;\n");
}
}
char replacedAlpha[64] = "0.0";
if (stencilToAlpha != REPLACE_ALPHA_NO) {
switch (replaceAlphaWithStencilType) {
case STENCIL_VALUE_UNIFORM:
truncate_cpy(replacedAlpha, "u_stencilReplaceValue");
break;
case STENCIL_VALUE_ZERO:
truncate_cpy(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.
truncate_cpy(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(replacedAlpha, sizeof(replacedAlpha), "%f", 1.0 / 15.0);
break;
case STENCIL_VALUE_INCR_8:
case STENCIL_VALUE_DECR_8:
// We're adding/subtracting, just by the smallest value in 8-bit.
snprintf(replacedAlpha, sizeof(replacedAlpha), "%f", 1.0 / 255.0);
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", compat.fragColor0, replacedAlpha);
WRITE(p, " %s = vec4(0.0, 0.0, 0.0, v.a);\n", compat.fragColor1);
break;
case REPLACE_ALPHA_YES:
WRITE(p, " %s = vec4(v.rgb, %s);\n", compat.fragColor0, replacedAlpha);
break;
case REPLACE_ALPHA_NO:
WRITE(p, " %s = v;\n", compat.fragColor0);
break;
default:
*errorString = "Bad stencil-to-alpha type, corrupt ID?";
return false;
}
// TODO: This could support more ops using the shader blending mechanism.
LogicOpReplaceType replaceLogicOpType = (LogicOpReplaceType)id.Bits(FS_BIT_REPLACE_LOGIC_OP_TYPE, 2);
switch (replaceLogicOpType) {
case LOGICOPTYPE_ONE:
WRITE(p, " %s.rgb = splat3(1.0);\n", compat.fragColor0);
break;
case LOGICOPTYPE_INVERT:
WRITE(p, " %s.rgb = splat3(1.0) - %s.rgb;\n", compat.fragColor0, compat.fragColor0);
break;
case LOGICOPTYPE_NORMAL:
break;
default:
*errorString = "Bad logic op type, corrupt ID?";
return false;
}
// Final color computed - apply color write mask.
// TODO: Maybe optimize to only do math on the affected channels?
// Or .. meh. That would require more shader bits. Though we could
// of course optimize for the common mask 0xF00000, though again, blue-to-alpha
// does a better job with that.
if (colorWriteMask) {
WRITE(p, " highp uint v32 = packUnorm4x8(%s);\n", compat.fragColor0);
WRITE(p, " highp uint d32 = packUnorm4x8(destColor);\n");
// Note that the mask has been flipped to the PC way - 1 means write.
WRITE(p, " v32 = (v32 & u_colorWriteMask) | (d32 & ~u_colorWriteMask);\n");
WRITE(p, " %s = unpackUnorm4x8(v32);\n", compat.fragColor0);
}
if (blueToAlpha) {
WRITE(p, " %s = vec4(0.0, 0.0, 0.0, %s.z); // blue to alpha\n", compat.fragColor0, compat.fragColor0);
}
if (colorToDepth) {
DepthScaleFactors factors = GetDepthScaleFactors();
if (compat.bitwiseOps) {
WRITE(p, " highp float depthValue = float(int(%s.x * 31.99) | (int(%s.y * 63.99) << 5) | (int(%s.z * 31.99) << 11)) / 65535.0;\n", "v", "v", "v"); // compat.fragColor0, compat.fragColor0, compat.fragColor0);
} else {
// D3D9-compatible alternative
WRITE(p, " highp float depthValue = (floor(%s.x * 31.99) + floor(%s.y * 63.99) * 32.0 + floor(%s.z * 31.99) * 2048.0) / 65535.0;\n", "v", "v", "v"); // compat.fragColor0, compat.fragColor0, compat.fragColor0);
}
if (factors.scale != 1.0 || factors.offset != 0.0) {
WRITE(p, " gl_FragDepth = (depthValue / %f) + %f;\n", factors.scale / 65535.0f, factors.offset);
} else {
WRITE(p, " gl_FragDepth = depthValue;\n");
}
}
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");
} else if (useDiscardStencilBugWorkaround) {
// Adreno and some Mali drivers apply early frag tests even with discard in the shader,
// when only stencil is used. The exact situation seems to vary by driver.
// Writing depth prevents the bug for both vendors, even with depth_unchanged specified.
// This doesn't make a ton of sense, but empirically does work.
WRITE(p, " gl_FragDepth = gl_FragCoord.z;\n");
}
if (compat.shaderLanguage == HLSL_D3D11 || compat.shaderLanguage == HLSL_D3D9) {
if (writeDepth) {
WRITE(p, " outfragment.depth = gl_FragDepth;\n");
}
WRITE(p, " return outfragment;\n");
}
WRITE(p, "}\n");
return true;
}
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