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GLSL shader gen: Add alpha test (...half of it I guess)

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wheremyfoodat 2024-05-13 00:51:40 +03:00
parent 798c651a17
commit 842943fa4c
7 changed files with 108 additions and 38 deletions
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24
src/core/PICA/shader_gen_glsl.cpp
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@ -144,6 +144,8 @@ std::string FragmentGenerator::generate(const PICARegs& regs) {
compileTEV(ret, i, regs);
}
applyAlphaTest(ret, regs);
ret += "fragColor = combinerOutput;\n";
ret += "}"; // End of main function
ret += "\n\n\n\n\n\n\n\n\n\n\n\n\n";
@ -353,3 +355,25 @@ void FragmentGenerator::getAlphaOperation(std::string& shader, TexEnvConfig::Ope
break;
}
}
void FragmentGenerator::applyAlphaTest(std::string& shader, const PICARegs& regs) {
const u32 alphaConfig = regs[InternalRegs::AlphaTestConfig];
// Alpha test disabled
if (Helpers::getBit<0>(alphaConfig) == 0) {
return;
}
const auto function = static_cast<CompareFunction>(Helpers::getBits<4, 3>(alphaConfig));
shader += "if (";
switch (function) {
case CompareFunction::Never: shader += "true"; break;
case CompareFunction::Always: shader += "false"; break;
default:
Helpers::warn("Unimplemented alpha test function");
shader += "false";
break;
}
shader += ") { discard; }\n";
}

27
src/core/renderer_gl/renderer_gl.cpp
View file

@ -796,22 +796,27 @@ std::optional<ColourBuffer> RendererGL::getColourBuffer(u32 addr, PICA::ColorFmt
OpenGL::Program& RendererGL::getSpecializedShader() {
PICA::FragmentConfig fsConfig;
fsConfig.texUnitConfig = regs[InternalRegs::TexUnitCfg];
fsConfig.texEnvUpdateBuffer = regs[InternalRegs::TexEnvUpdateBuffer];
fsConfig.texEnvBufferColor = regs[InternalRegs::TexEnvBufferColor];
auto& outConfig = fsConfig.outConfig;
auto& texConfig = fsConfig.texConfig;
auto alphaTestConfig = regs[InternalRegs::AlphaTestConfig];
auto alphaTestFunction = Helpers::getBits<4, 3>(alphaTestConfig);
outConfig.alphaTestFunction = (alphaTestConfig & 1) ? static_cast<PICA::CompareFunction>(alphaTestFunction) : PICA::CompareFunction::Always;
texConfig.texUnitConfig = regs[InternalRegs::TexUnitCfg];
texConfig.texEnvUpdateBuffer = regs[InternalRegs::TexEnvUpdateBuffer];
texConfig.texEnvBufferColor = 0;
// Set up TEV stages
std::memcpy(&fsConfig.tevConfigs[0 * 5], &regs[InternalRegs::TexEnv0Source], 5 * sizeof(u32));
std::memcpy(&fsConfig.tevConfigs[1 * 5], &regs[InternalRegs::TexEnv1Source], 5 * sizeof(u32));
std::memcpy(&fsConfig.tevConfigs[2 * 5], &regs[InternalRegs::TexEnv2Source], 5 * sizeof(u32));
std::memcpy(&fsConfig.tevConfigs[3 * 5], &regs[InternalRegs::TexEnv3Source], 5 * sizeof(u32));
std::memcpy(&fsConfig.tevConfigs[4 * 5], &regs[InternalRegs::TexEnv4Source], 5 * sizeof(u32));
std::memcpy(&fsConfig.tevConfigs[5 * 5], &regs[InternalRegs::TexEnv5Source], 5 * sizeof(u32));
std::memcpy(&texConfig.tevConfigs[0 * 5], &regs[InternalRegs::TexEnv0Source], 5 * sizeof(u32));
std::memcpy(&texConfig.tevConfigs[1 * 5], &regs[InternalRegs::TexEnv1Source], 5 * sizeof(u32));
std::memcpy(&texConfig.tevConfigs[2 * 5], &regs[InternalRegs::TexEnv2Source], 5 * sizeof(u32));
std::memcpy(&texConfig.tevConfigs[3 * 5], &regs[InternalRegs::TexEnv3Source], 5 * sizeof(u32));
std::memcpy(&texConfig.tevConfigs[4 * 5], &regs[InternalRegs::TexEnv4Source], 5 * sizeof(u32));
std::memcpy(&texConfig.tevConfigs[5 * 5], &regs[InternalRegs::TexEnv5Source], 5 * sizeof(u32));
OpenGL::Program& program = shaderCache[fsConfig];
if (!program.exists()) {
printf("Creating specialized shader\n");
std::string vs = fragShaderGen.getVertexShader(regs);
std::string fs = fragShaderGen.generate(regs);
std::cout << vs << "\n\n" << fs << "\n";