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Merge pull request #558 from wheremyfoodat/shader-decomp

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More instructions in shader decompiler
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wheremyfoodat 2024-07-24 14:02:53 +00:00 • committed by GitHub
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1 changed files with 47 additions and 1 deletions
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48
src/core/PICA/shader_decompiler.cpp
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@ -255,10 +255,56 @@ void ShaderDecompiler::compileInstruction(u32& pc, bool& finished) {
}
switch (opcode) {
case ShaderOpcodes::DP4: setDest(operandDescriptor, dest, "vec4(dot(" + src1 + ", " + src2 + "))"); break;
case ShaderOpcodes::MOV: setDest(operandDescriptor, dest, src1); break;
case ShaderOpcodes::ADD: setDest(operandDescriptor, dest, src1 + " + " + src2); break;
case ShaderOpcodes::MUL: setDest(operandDescriptor, dest, src1 + " * " + src2); break;
case ShaderOpcodes::MAX: setDest(operandDescriptor, dest, "max(" + src1 + ", " + src2 + ")"); break;
case ShaderOpcodes::MIN: setDest(operandDescriptor, dest, "min(" + src1 + ", " + src2 + ")"); break;
case ShaderOpcodes::DP3: setDest(operandDescriptor, dest, "vec4(dot(" + src1 + ".xyz, " + src2 + ".xyz))"); break;
case ShaderOpcodes::DP4: setDest(operandDescriptor, dest, "vec4(dot(" + src1 + ", " + src2 + "))"); break;
case ShaderOpcodes::RSQ: setDest(operandDescriptor, dest, "vec4(inversesqrt(" + src1 + ".x))"); break;
default: Helpers::panic("GLSL recompiler: Unknown common opcode: %X", opcode); break;
}
} else if (opcode >= 0x30 && opcode <= 0x3F) { // MAD and MADI
const u32 operandDescriptor = shader.operandDescriptors[instruction & 0x1f];
const bool isMADI = getBit<29>(instruction) == 0; // We detect MADI based on bit 29 of the instruction
// src1 and src2 indexes depend on whether this is one of the inverting instructions or not
const u32 src1Index = getBits<17, 5>(instruction);
const u32 src2Index = isMADI ? getBits<12, 5>(instruction) : getBits<10, 7>(instruction);
const u32 src3Index = isMADI ? getBits<5, 7>(instruction) : getBits<5, 5>(instruction);
const u32 idx = getBits<22, 2>(instruction);
const u32 destIndex = getBits<24, 5>(instruction);
const bool negate1 = (getBit<4>(operandDescriptor)) != 0;
const u32 swizzle1 = getBits<5, 8>(operandDescriptor);
const bool negate2 = (getBit<13>(operandDescriptor)) != 0;
const u32 swizzle2 = getBits<14, 8>(operandDescriptor);
const bool negate3 = (getBit<22>(operandDescriptor)) != 0;
const u32 swizzle3 = getBits<23, 8>(operandDescriptor);
std::string src1 = negate1 ? "-" : "";
src1 += getSource(src1Index, 0);
src1 += getSwizzlePattern(swizzle1);
std::string src2 = negate2 ? "-" : "";
src2 += getSource(src2Index, isMADI ? 0 : idx);
src2 += getSwizzlePattern(swizzle2);
std::string src3 = negate3 ? "-" : "";
src3 += getSource(src3Index, isMADI ? idx : 0);
src3 += getSwizzlePattern(swizzle3);
std::string dest = getDest(destIndex);
if (idx != 0) {
Helpers::panic("GLSL recompiler: Indexed instruction");
}
setDest(operandDescriptor, dest, src1 + " * " + src2 + " + " + src3);
} else {
switch (opcode) {
case ShaderOpcodes::END: finished = true; return;