shadPS4/src/shader_recompiler/frontend/translate/export.cpp

50 lines
1.5 KiB
C++

// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "shader_recompiler/frontend/translate/translate.h"
namespace Shader::Gcn {
void Translator::EXP(const GcnInst& inst) {
const auto& exp = inst.control.exp;
const IR::Attribute attrib{exp.target};
const std::array vsrc = {
IR::VectorReg(inst.src[0].code),
IR::VectorReg(inst.src[1].code),
IR::VectorReg(inst.src[2].code),
IR::VectorReg(inst.src[3].code),
};
const auto unpack = [&](u32 idx) {
const IR::Value value = ir.UnpackHalf2x16(ir.GetVectorReg(vsrc[idx]));
const IR::F32 r = IR::F32{ir.CompositeExtract(value, 0)};
const IR::F32 g = IR::F32{ir.CompositeExtract(value, 1)};
ir.SetAttribute(attrib, r, idx * 2);
ir.SetAttribute(attrib, g, idx * 2 + 1);
};
// Components are float16 packed into a VGPR
if (exp.compr) {
// Export R, G
if (exp.en & 1) {
unpack(0);
}
// Export B, A
if ((exp.en >> 2) & 1) {
unpack(1);
}
} else {
// Components are float32 into separate VGPRS
u32 mask = exp.en;
for (u32 i = 0; i < 4; i++, mask >>= 1) {
if ((mask & 1) == 0) {
continue;
}
const IR::F32 comp = ir.GetVectorReg<IR::F32>(vsrc[i]);
ir.SetAttribute(attrib, comp, i);
}
}
}
} // namespace Shader::Gcn