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GLSL generator: Add textures and alpha operations

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wheremyfoodat 2024-02-04 18:54:29 +02:00
parent 9dc12e0681
commit 10654ce1ca
2 changed files with 40 additions and 2 deletions
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2
include/PICA/shader_gen.hpp
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@ -24,6 +24,8 @@ namespace PICA::ShaderGen {
void getColorOperation(std::string& shader, PICA::TexEnvConfig::Operation op);
void getAlphaOperation(std::string& shader, PICA::TexEnvConfig::Operation op);
u32 textureConfig = 0;
public:
FragmentGenerator(API api, Language language) : api(api), language(language) {}
std::string generate(const PICARegs& regs);

40
src/core/PICA/shader_gen_glsl.cpp
View file

@ -63,6 +63,7 @@ std::string FragmentGenerator::generate(const PICARegs& regs) {
float alphaOperand3 = 0.0;
)";
textureConfig = regs[InternalRegs::TexUnitCfg];
for (int i = 0; i < 6; i++) {
compileTEV(ret, i, regs);
}
@ -113,8 +114,10 @@ void FragmentGenerator::compileTEV(std::string& shader, int stage, const PICAReg
shader += ";\nalphaOp3 = ";
getAlphaOperand(shader, tev.alphaSource3, tev.alphaOperand3, stage);
shader += ";\nvec3 outputAlpha" + std::to_string(stage) + " = 1.0";
shader += ";\n";
shader += ";\nvec3 outputAlpha" + std::to_string(stage) + " = ";
getAlphaOperation(shader, tev.alphaOp);
// Clamp the alpha value to [0.0, 1.0]
shader += ";\nclamp(outputAlpha" + std::to_string(stage) + ", 0.0, 1.0);\n";
}
shader += "combinerOutput = vec4(clamp(outputColor" + std::to_string(stage) + " * " + std::to_string(tev.getColorScale()) +
@ -214,6 +217,19 @@ void FragmentGenerator::getAlphaOperand(std::string& shader, TexEnvConfig::Sourc
void FragmentGenerator::getSource(std::string& shader, TexEnvConfig::Source source, int index) {
switch (source) {
case TexEnvConfig::Source::PrimaryColor: shader += "v_colour"; break;
case TexEnvConfig::Source::Texture0: shader += "texture(u_tex0, v_texcoord0.xy)"; break;
case TexEnvConfig::Source::Texture1: shader += "texture(u_tex1, v_texcoord1)"; break;
case TexEnvConfig::Source::Texture2: {
// If bit 13 in texture config is set then we use the texcoords for texture 1, otherwise for texture 2
if (Helpers::getBit<13>(textureConfig)) {
shader += "texture(u_tex2, v_texcoord1)";
} else {
shader += "texture(u_tex2, v_texcoord2)";
}
break;
}
case TexEnvConfig::Source::Previous: shader += "combinerOutput"; break;
default:
Helpers::warn("Unimplemented TEV source: %d", static_cast<int>(source));
@ -240,4 +256,24 @@ void FragmentGenerator::getColorOperation(std::string& shader, TexEnvConfig::Ope
shader += "vec3(1.0)";
break;
}
}
void FragmentGenerator::getAlphaOperation(std::string& shader, TexEnvConfig::Operation op) {
switch (op) {
case TexEnvConfig::Operation::Replace: shader += "alphaOp1"; break;
case TexEnvConfig::Operation::Add: shader += "alphaOp1 + alphaOp2"; break;
case TexEnvConfig::Operation::AddSigned: shader += "clamp(alphaOp1 + alphaOp2 - 0.5, 0.0, 1.0);"; break;
case TexEnvConfig::Operation::Subtract: shader += "alphaOp1 - alphaOp2"; break;
case TexEnvConfig::Operation::Modulate: shader += "alphaOp1 * alphaOp2"; break;
case TexEnvConfig::Operation::Lerp: shader += "alphaOp1 * alphaOp3 + alphaOp2 * (vec(1.0) - alphaOp3)"; break;
case TexEnvConfig::Operation::AddMultiply: shader += "min(alphaOp1 + alphaOp2, vec3(1.0)) * alphaOp3"; break;
case TexEnvConfig::Operation::MultiplyAdd: shader += "alphaOp1 * alphaOp2 + alphaOp3"; break;
case TexEnvConfig::Operation::Dot3RGB:
case TexEnvConfig::Operation::Dot3RGBA: shader += "vec3(4.0 * dot(alphaOp1 - 0.5, alphaOp2 - 0.5))"; break;
default:
Helpers::warn("FragmentGenerator: Unimplemented alpha op");
shader += "vec3(1.0)";
break;
}
}