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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/bit_field.h"
#include "common/common_types.h"
#include "shader_recompiler/exception.h"
#include "shader_recompiler/frontend/ir/ir_emitter.h"
#include "shader_recompiler/frontend/maxwell/opcodes.h"
#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
namespace Shader::Maxwell {
namespace {
enum class Size : u64 {
B32,
B64,
B96,
B128,
};
enum class InterpolationMode : u64 {
Pass,
Multiply,
Constant,
Sc,
};
enum class SampleMode : u64 {
Default,
Centroid,
Offset,
};
int NumElements(Size size) {
switch (size) {
case Size::B32:
return 1;
case Size::B64:
return 2;
case Size::B96:
return 3;
case Size::B128:
return 4;
}
throw InvalidArgument("Invalid size {}", size);
}
} // Anonymous namespace
void TranslatorVisitor::ALD(u64 insn) {
union {
u64 raw;
BitField<0, 8, IR::Reg> dest_reg;
BitField<8, 8, IR::Reg> index_reg;
BitField<20, 10, u64> absolute_offset;
BitField<20, 11, s64> relative_offset;
BitField<39, 8, IR::Reg> stream_reg;
BitField<32, 1, u64> o;
BitField<31, 1, u64> patch;
BitField<47, 2, Size> size;
} const ald{insn};
if (ald.o != 0) {
throw NotImplementedException("O");
}
if (ald.patch != 0) {
throw NotImplementedException("P");
}
if (ald.index_reg != IR::Reg::RZ) {
throw NotImplementedException("Indexed");
}
const u64 offset{ald.absolute_offset.Value()};
if (offset % 4 != 0) {
throw NotImplementedException("Unaligned absolute offset {}", offset);
}
const int num_elements{NumElements(ald.size)};
for (int element = 0; element < num_elements; ++element) {
F(ald.dest_reg + element, ir.GetAttribute(IR::Attribute{offset / 4 + element}));
}
}
void TranslatorVisitor::AST(u64 insn) {
union {
u64 raw;
BitField<0, 8, IR::Reg> src_reg;
BitField<8, 8, IR::Reg> index_reg;
BitField<20, 10, u64> absolute_offset;
BitField<20, 11, s64> relative_offset;
BitField<31, 1, u64> patch;
BitField<39, 8, IR::Reg> stream_reg;
BitField<47, 2, Size> size;
} const ast{insn};
if (ast.patch != 0) {
throw NotImplementedException("P");
}
if (ast.stream_reg != IR::Reg::RZ) {
throw NotImplementedException("Stream store");
}
if (ast.index_reg != IR::Reg::RZ) {
throw NotImplementedException("Indexed store");
}
const u64 offset{ast.absolute_offset.Value()};
if (offset % 4 != 0) {
throw NotImplementedException("Unaligned absolute offset {}", offset);
}
const int num_elements{NumElements(ast.size)};
for (int element = 0; element < num_elements; ++element) {
ir.SetAttribute(IR::Attribute{offset / 4 + element}, F(ast.src_reg + element));
}
}
void TranslatorVisitor::IPA(u64 insn) {
// IPA is the instruction used to read varyings from a fragment shader.
// gl_FragCoord is mapped to the gl_Position attribute.
// It yields unknown results when used outside of the fragment shader stage.
union {
u64 raw;
BitField<0, 8, IR::Reg> dest_reg;
BitField<8, 8, IR::Reg> index_reg;
BitField<20, 8, IR::Reg> multiplier;
BitField<30, 8, IR::Attribute> attribute;
BitField<38, 1, u64> idx;
BitField<51, 1, u64> sat;
BitField<52, 2, SampleMode> sample_mode;
BitField<54, 2, InterpolationMode> interpolation_mode;
} const ipa{insn};
// Indexed IPAs are used for indexed varyings.
// For example:
//
// in vec4 colors[4];
// uniform int idx;
// void main() {
// gl_FragColor = colors[idx];
// }
const bool is_indexed{ipa.idx != 0 && ipa.index_reg != IR::Reg::RZ};
if (is_indexed) {
throw NotImplementedException("IDX");
}
const IR::Attribute attribute{ipa.attribute};
IR::F32 value{ir.GetAttribute(attribute)};
if (IR::IsGeneric(attribute)) {
const ProgramHeader& sph{env.SPH()};
const u32 attr_index{IR::GenericAttributeIndex(attribute)};
const u32 element{static_cast<u32>(attribute) % 4};
const std::array input_map{sph.ps.GenericInputMap(attr_index)};
const bool is_perspective{input_map[element] == Shader::PixelImap::Perspective};
if (is_perspective) {
const IR::F32 position_w{ir.GetAttribute(IR::Attribute::PositionW)};
value = ir.FPMul(value, position_w);
}
}
if (ipa.interpolation_mode == InterpolationMode::Multiply) {
value = ir.FPMul(value, F(ipa.multiplier));
}
// Saturated IPAs are generally generated out of clamped varyings.
// For example: clamp(some_varying, 0.0, 1.0)
const bool is_saturated{ipa.sat != 0};
if (is_saturated) {
if (attribute == IR::Attribute::FrontFace) {
throw NotImplementedException("IPA.SAT on FrontFace");
}
value = ir.FPSaturate(value);
}
F(ipa.dest_reg, value);
}
} // namespace Shader::Maxwell
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