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Shader decompiler: Add loops

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wheremyfoodat 2024-08-01 00:55:20 +03:00
parent ffcf352dd2
commit b46f7ad9bc
1 changed files with 42 additions and 2 deletions
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44
src/core/PICA/shader_decompiler.cpp
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@ -146,7 +146,24 @@ ExitMode ControlFlow::analyzeFunction(const PICAShader& shader, u32 start, u32 e
}
case ShaderOpcodes::CALLC: Helpers::panic("Unimplemented control flow operation (CALLC)"); break;
case ShaderOpcodes::CALLU: Helpers::panic("Unimplemented control flow operation (CALLU)"); break;
case ShaderOpcodes::LOOP: Helpers::panic("Unimplemented control flow operation (LOOP)"); break;
case ShaderOpcodes::LOOP: {
u32 dest = getBits<10, 12>(instruction);
const Function* loopFunction = addFunction(shader, pc + 1, dest + 1);
if (analysisFailed) {
it->second = ExitMode::Unknown;
return it->second;
}
if (loopFunction->exitMode == ExitMode::AlwaysEnd) {
it->second = ExitMode::AlwaysEnd;
return it->second;
}
ExitMode afterLoop = analyzeFunction(shader, dest + 1, end, labels);
ExitMode exitMode = exitSeries(afterLoop, loopFunction->exitMode);
it->second = exitMode;
return it->second;
}
case ShaderOpcodes::END: it->second = ExitMode::AlwaysEnd; return it->second;
default: break;
@ -577,12 +594,35 @@ void ShaderDecompiler::compileInstruction(u32& pc, bool& finished) {
break;
}
case ShaderOpcodes::LOOP: {
const u32 dest = getBits<10, 12>(instruction);
const u32 uniformIndex = getBits<22, 2>(instruction);
// loop counter = uniform.y
decompiledShader += fmt::format("addr_reg.z = int((uniform_int[{}] >> 16u) & 0xFFu);\n", uniformIndex);
decompiledShader += fmt::format(
"for (uint loopCtr{} = 0u; loopCtr{} <= ((uniform_int[{}] >> 24) & 0xFFu); loopCtr{}++, addr_reg.z += int((uniform_int[{}] >> "
"8u) & 0xFFu)) {{\n",
pc, pc, uniformIndex, pc, uniformIndex
);
AddressRange range(pc + 1, dest + 1);
const Function* func = findFunction(range);
callFunction(*func);
decompiledShader += "}\n";
if (func->exitMode == ExitMode::AlwaysEnd) {
finished = true;
return;
}
break;
}
case ShaderOpcodes::END:
decompiledShader += "return;\n";
finished = true;
return;
case ShaderOpcodes::NOP: break;
default: Helpers::panic("GLSL recompiler: Unknown opcode: %X", opcode); break;
}