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-rw-r--r--src/shader_recompiler/frontend/maxwell/translate/impl/texture_gradient.cpp182
1 files changed, 182 insertions, 0 deletions
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/texture_gradient.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/texture_gradient.cpp
new file mode 100644
index 000000000..c3fe3ffda
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/texture_gradient.cpp
@@ -0,0 +1,182 @@
+// 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