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