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[PICA] Implement loops

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wheremyfoodat 2022-09-25 18:34:36 +03:00
parent a5c6fb858f
commit 3706c7ee0c
2 changed files with 44 additions and 3 deletions
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29
src/core/PICA/shader_interpreter.cpp
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@ -11,11 +11,25 @@ void PICAShader::run() {
case ShaderOpcodes::ADD: add(instruction); break;
case ShaderOpcodes::DP4: dp4(instruction); break;
case ShaderOpcodes::END: return; // Stop running shader
case ShaderOpcodes::LOOP: loop(instruction); break;
case ShaderOpcodes::MOV: mov(instruction); break;
case ShaderOpcodes::MOVA: mova(instruction); break;
case ShaderOpcodes::MUL: mul(instruction); break;
default:Helpers::panic("Unimplemented PICA instruction %08X (Opcode = %02X)", instruction, opcode);
}
// Handle loop
if (loopIndex != 0) {
auto& loop = loopInfo[loopIndex - 1];
if (pc == loop.endingPC) { // Check if the loop needs to start over
loop.iterations -= 1;
if (loop.iterations == 0) // If the loop ended, go one level down on the loop stack
loopIndex -= 1;
loopCounter += loop.increment;
pc = loop.startingPC;
}
}
}
}
@ -153,4 +167,19 @@ void PICAShader::dp4(u32 instruction) {
destVector[3 - i] = dot;
}
}
}
void PICAShader::loop(u32 instruction) {
if (loopIndex >= 4) [[unlikely]]
Helpers::panic("[PICA] Overflowed loop stack");
u32 dest = (instruction >> 10) & 0xfff;
auto& uniform = intUniforms[(instruction >> 22) & 3]; // The uniform we'll get loop info from
loopCounter = uniform.y();
auto& loop = loopInfo[loopIndex++];
loop.startingPC = pc;
loop.endingPC = dest + 1; // Loop is inclusive so we need + 1 here
loop.iterations = uniform.x() + 1;
loop.increment = uniform.z();
}