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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <optional>
#include "common/bit_field.h"
#include "common/common_types.h"
#include "shader_recompiler/frontend/ir/modifiers.h"
#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
namespace Shader::Maxwell {
namespace {
enum class TextureType : u64 {
_1D,
ARRAY_1D,
_2D,
ARRAY_2D,
_3D,
ARRAY_3D,
CUBE,
ARRAY_CUBE,
};
Shader::TextureType GetType(TextureType type) {
switch (type) {
case TextureType::_1D:
return Shader::TextureType::Color1D;
case TextureType::ARRAY_1D:
return Shader::TextureType::ColorArray1D;
case TextureType::_2D:
return Shader::TextureType::Color2D;
case TextureType::ARRAY_2D:
return Shader::TextureType::ColorArray2D;
case TextureType::_3D:
return Shader::TextureType::Color3D;
case TextureType::ARRAY_3D:
throw NotImplementedException("3D array texture type");
case TextureType::CUBE:
return Shader::TextureType::ColorCube;
case TextureType::ARRAY_CUBE:
return Shader::TextureType::ColorArrayCube;
}
throw NotImplementedException("Invalid texture type {}", type);
}
IR::Value MakeOffset(TranslatorVisitor& v, IR::Reg reg, bool has_lod_clamp) {
const IR::U32 value{v.X(reg)};
const u32 base{has_lod_clamp ? 12U : 16U};
return v.ir.CompositeConstruct(
v.ir.BitFieldExtract(value, v.ir.Imm32(base), v.ir.Imm32(4), true),
v.ir.BitFieldExtract(value, v.ir.Imm32(base + 4), v.ir.Imm32(4), true));
}
void Impl(TranslatorVisitor& v, u64 insn, bool is_bindless) {
union {
u64 raw;
BitField<49, 1, u64> nodep;
BitField<35, 1, u64> aoffi;
BitField<50, 1, u64> lc;
BitField<51, 3, IR::Pred> sparse_pred;
BitField<0, 8, IR::Reg> dest_reg;
BitField<8, 8, IR::Reg> coord_reg;
BitField<20, 8, IR::Reg> derivate_reg;
BitField<28, 3, TextureType> type;
BitField<31, 4, u64> mask;
BitField<36, 13, u64> cbuf_offset;
} const txd{insn};
const bool has_lod_clamp = txd.lc != 0;
if (has_lod_clamp) {
throw NotImplementedException("TXD.LC - CLAMP is not implemented");
}
IR::Value coords;
u32 num_derivates{};
IR::Reg base_reg{txd.coord_reg};
IR::Reg last_reg;
IR::Value handle;
if (is_bindless) {
handle = v.X(base_reg++);
} else {
handle = v.ir.Imm32(static_cast<u32>(txd.cbuf_offset.Value() * 4));
}
const auto read_array{[&]() -> IR::F32 {
const IR::U32 base{v.ir.Imm32(0)};
const IR::U32 count{v.ir.Imm32(has_lod_clamp ? 12 : 16)};
const IR::U32 array_index{v.ir.BitFieldExtract(v.X(last_reg), base, count)};
return v.ir.ConvertUToF(32, 16, array_index);
}};
switch (txd.type) {
case TextureType::_1D: {
coords = v.F(base_reg);
num_derivates = 1;
last_reg = base_reg + 1;
break;
}
case TextureType::ARRAY_1D: {
last_reg = base_reg + 1;
coords = v.ir.CompositeConstruct(v.F(base_reg), read_array());
num_derivates = 1;
break;
}
case TextureType::_2D: {
last_reg = base_reg + 2;
coords = v.ir.CompositeConstruct(v.F(base_reg), v.F(base_reg + 1));
num_derivates = 2;
break;
}
case TextureType::ARRAY_2D: {
last_reg = base_reg + 2;
coords = v.ir.CompositeConstruct(v.F(base_reg), v.F(base_reg + 1), read_array());
num_derivates = 2;
break;
}
default:
throw NotImplementedException("Invalid texture type");
}
const IR::Reg derivate_reg{txd.derivate_reg};
IR::Value derivates;
switch (num_derivates) {
case 1: {
derivates = v.ir.CompositeConstruct(v.F(derivate_reg), v.F(derivate_reg + 1));
break;
}
case 2: {
derivates = v.ir.CompositeConstruct(v.F(derivate_reg), v.F(derivate_reg + 1),
v.F(derivate_reg + 2), v.F(derivate_reg + 3));
break;
}
default:
throw NotImplementedException("Invalid texture type");
}
IR::Value offset;
if (txd.aoffi != 0) {
offset = MakeOffset(v, last_reg, has_lod_clamp);
}
IR::F32 lod_clamp;
if (has_lod_clamp) {
// Lod Clamp is a Fixed Point 4.8, we need to transform it to float.
// to convert a fixed point, float(value) / float(1 << fixed_point)
// in this case the fixed_point is 8.
const IR::F32 conv4_8fixp_f{v.ir.Imm32(static_cast<f32>(1U << 8))};
const IR::F32 fixp_lc{v.ir.ConvertUToF(
32, 16, v.ir.BitFieldExtract(v.X(last_reg), v.ir.Imm32(20), v.ir.Imm32(12)))};
lod_clamp = v.ir.FPMul(fixp_lc, conv4_8fixp_f);
}
IR::TextureInstInfo info{};
info.type.Assign(GetType(txd.type));
info.num_derivates.Assign(num_derivates);
info.has_lod_clamp.Assign(has_lod_clamp ? 1 : 0);
const IR::Value sample{v.ir.ImageGradient(handle, coords, derivates, offset, lod_clamp, info)};
IR::Reg dest_reg{txd.dest_reg};
for (size_t element = 0; element < 4; ++element) {
if (((txd.mask >> element) & 1) == 0) {
continue;
}
v.F(dest_reg, IR::F32{v.ir.CompositeExtract(sample, element)});
++dest_reg;
}
if (txd.sparse_pred != IR::Pred::PT) {
v.ir.SetPred(txd.sparse_pred, v.ir.LogicalNot(v.ir.GetSparseFromOp(sample)));
}
}
} // Anonymous namespace
void TranslatorVisitor::TXD(u64 insn) {
Impl(*this, insn, false);
}
void TranslatorVisitor::TXD_b(u64 insn) {
Impl(*this, insn, true);
}
} // namespace Shader::Maxwell
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