3 files changed, 211 insertions, 10 deletions

diff --git a/src/shader_recompiler/frontend/maxwell/maxwell.inc b/src/shader_recompiler/frontend/maxwell/maxwell.inc
index c6cd2a79b..d668dc1aa 100644
--- a/src/shader_recompiler/frontend/maxwell/maxwell.inc
+++ b/src/shader_recompiler/frontend/maxwell/maxwell.inc
@@ -254,8 +254,8 @@ INST(TEX_b,        "TEX (b)",        "1101 1110 10-- ----")
 INST(TEXS,         "TEXS",           "1101 -00- ---- ----")
 INST(TLD,          "TLD",            "1101 1100 --11 1---")
 INST(TLD_b,        "TLD (b)",        "1101 1101 --11 1---")
-INST(TLD4,         "TLD4",           "1100 10-- --11 1---")
-INST(TLD4_b,       "TLD4 (b)",       "1101 1110 1111 1---")
+INST(TLD4,         "TLD4",           "1100 10-- ---- ----")
+INST(TLD4_b,       "TLD4 (b)",       "1101 1110 11-- ----")
 INST(TLD4S,        "TLD4S",          "1101 1111 -0-- ----")
 INST(TLDS,         "TLDS",           "1101 -01- ---- ----")
 INST(TMML,         "TMML",           "1101 1111 0101 1---")
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
index 3ccd7b925..e59c3326e 100644
--- a/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
@@ -349,14 +349,6 @@ void TranslatorVisitor::TLD_b(u64) {
     ThrowNotImplemented(Opcode::TLD_b);
 }
 
-void TranslatorVisitor::TLD4(u64) {
-    ThrowNotImplemented(Opcode::TLD4);
-}
-
-void TranslatorVisitor::TLD4_b(u64) {
-    ThrowNotImplemented(Opcode::TLD4_b);
-}
-
 void TranslatorVisitor::TLD4S(u64) {
     ThrowNotImplemented(Opcode::TLD4S);
 }
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/texture_gather.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/texture_gather.cpp
new file mode 100644
index 000000000..d64865876
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/texture_gather.cpp
@@ -0,0 +1,209 @@
+// 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,
+};
+
+enum class OffsetType : u64 {
+    None = 0,
+    AOFFI,
+    PTP,
+    Invalid,
+};
+
+enum class ComponentType : u64 {
+    R = 0,
+    G = 1,
+    B = 2,
+    A = 3,
+};
+
+Shader::TextureType GetType(TextureType type, bool dc) {
+    switch (type) {
+    case TextureType::_1D:
+        return dc ? Shader::TextureType::Shadow1D : Shader::TextureType::Color1D;
+    case TextureType::ARRAY_1D:
+        return dc ? Shader::TextureType::ShadowArray1D : Shader::TextureType::ColorArray1D;
+    case TextureType::_2D:
+        return dc ? Shader::TextureType::Shadow2D : Shader::TextureType::Color2D;
+    case TextureType::ARRAY_2D:
+        return dc ? Shader::TextureType::ShadowArray2D : Shader::TextureType::ColorArray2D;
+    case TextureType::_3D:
+        return dc ? Shader::TextureType::Shadow3D : Shader::TextureType::Color3D;
+    case TextureType::ARRAY_3D:
+        throw NotImplementedException("3D array texture type");
+    case TextureType::CUBE:
+        return dc ? Shader::TextureType::ShadowCube : Shader::TextureType::ColorCube;
+    case TextureType::ARRAY_CUBE:
+        return dc ? Shader::TextureType::ShadowArrayCube : Shader::TextureType::ColorArrayCube;
+    }
+    throw NotImplementedException("Invalid texture type {}", type);
+}
+
+IR::Value MakeCoords(TranslatorVisitor& v, IR::Reg reg, TextureType type) {
+    const auto read_array{[&]() -> IR::F32 { return v.ir.ConvertUToF(32, 16, v.X(reg)); }};
+    switch (type) {
+    case TextureType::_1D:
+        return v.F(reg);
+    case TextureType::ARRAY_1D:
+        return v.ir.CompositeConstruct(read_array(), v.F(reg + 1));
+    case TextureType::_2D:
+        return v.ir.CompositeConstruct(v.F(reg), v.F(reg + 1));
+    case TextureType::ARRAY_2D:
+        return v.ir.CompositeConstruct(read_array(), v.F(reg + 1), v.F(reg + 2));
+    case TextureType::_3D:
+        return v.ir.CompositeConstruct(v.F(reg), v.F(reg + 1), v.F(reg + 2));
+    case TextureType::ARRAY_3D:
+        throw NotImplementedException("3D array texture type");
+    case TextureType::CUBE:
+        return v.ir.CompositeConstruct(v.F(reg), v.F(reg + 1), v.F(reg + 2));
+    case TextureType::ARRAY_CUBE:
+        return v.ir.CompositeConstruct(read_array(), v.F(reg + 1), v.F(reg + 2), v.F(reg + 3));
+    }
+    throw NotImplementedException("Invalid texture type {}", type);
+}
+
+IR::Value MakeOffset(TranslatorVisitor& v, IR::Reg& reg, TextureType type) {
+    const IR::U32 value{v.X(reg++)};
+    switch (type) {
+    case TextureType::_1D:
+    case TextureType::ARRAY_1D:
+        return v.ir.BitFieldExtract(value, v.ir.Imm32(0), v.ir.Imm32(6), true);
+    case TextureType::_2D:
+    case TextureType::ARRAY_2D:
+        return v.ir.CompositeConstruct(
+            v.ir.BitFieldExtract(value, v.ir.Imm32(0), v.ir.Imm32(6), true),
+            v.ir.BitFieldExtract(value, v.ir.Imm32(8), v.ir.Imm32(6), true));
+    case TextureType::_3D:
+    case TextureType::ARRAY_3D:
+        return v.ir.CompositeConstruct(
+            v.ir.BitFieldExtract(value, v.ir.Imm32(0), v.ir.Imm32(6), true),
+            v.ir.BitFieldExtract(value, v.ir.Imm32(8), v.ir.Imm32(6), true),
+            v.ir.BitFieldExtract(value, v.ir.Imm32(16), v.ir.Imm32(6), true));
+    case TextureType::CUBE:
+    case TextureType::ARRAY_CUBE:
+        throw NotImplementedException("Illegal offset on CUBE sample");
+    }
+    throw NotImplementedException("Invalid texture type {}", type);
+}
+
+std::pair<IR::Value, IR::Value> MakeOffsetPTP(TranslatorVisitor& v, IR::Reg& reg) {
+    const IR::U32 value1{v.X(reg++)};
+    const IR::U32 value2{v.X(reg++)};
+    const auto getVector = ([&v](const IR::U32& value) {
+        return v.ir.CompositeConstruct(
+            v.ir.BitFieldExtract(value, v.ir.Imm32(0), v.ir.Imm32(6), true),
+            v.ir.BitFieldExtract(value, v.ir.Imm32(8), v.ir.Imm32(6), true),
+            v.ir.BitFieldExtract(value, v.ir.Imm32(16), v.ir.Imm32(6), true),
+            v.ir.BitFieldExtract(value, v.ir.Imm32(24), v.ir.Imm32(6), true));
+    });
+    return {getVector(value1), getVector(value2)};
+}
+
+void Impl(TranslatorVisitor& v, u64 insn, ComponentType component_type, OffsetType offset_type,
+          bool is_bindless) {
+    union {
+        u64 raw;
+        BitField<35, 1, u64> ndv;
+        BitField<49, 1, u64> nodep;
+        BitField<50, 1, u64> dc;
+        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> meta_reg;
+        BitField<28, 3, TextureType> type;
+        BitField<31, 4, u64> mask;
+        BitField<36, 13, u64> cbuf_offset;
+    } const tld4{insn};
+
+    const IR::Value coords{MakeCoords(v, tld4.coord_reg, tld4.type)};
+
+    IR::Reg meta_reg{tld4.meta_reg};
+    IR::Value handle;
+    IR::Value offset;
+    IR::Value offset2;
+    IR::F32 dref;
+    if (!is_bindless) {
+        handle = v.ir.Imm32(static_cast<u32>(tld4.cbuf_offset.Value() * 4));
+    } else {
+        handle = v.X(meta_reg++);
+    }
+    switch (offset_type) {
+    case OffsetType::None:
+        break;
+    case OffsetType::AOFFI: {
+        offset = MakeOffset(v, meta_reg, tld4.type);
+        break;
+    }
+    case OffsetType::PTP: {
+        std::tie(offset, offset2) = MakeOffsetPTP(v, meta_reg);
+        break;
+    }
+    default:
+        throw NotImplementedException("Invalid offset type {}", offset_type);
+    }
+    if (tld4.dc != 0) {
+        dref = v.F(meta_reg++);
+    }
+    IR::TextureInstInfo info{};
+    info.type.Assign(GetType(tld4.type, tld4.dc != 0));
+    info.gather_component.Assign(static_cast<u32>(component_type));
+    const IR::Value sample{[&]() -> IR::Value {
+        if (tld4.dc == 0) {
+            return v.ir.ImageGather(handle, coords, offset, offset2, info);
+        }
+        return v.ir.ImageGatherDref(handle, coords, offset, offset2, dref, info);
+    }()};
+
+    IR::Reg dest_reg{tld4.dest_reg};
+    for (size_t element = 0; element < 4; ++element) {
+        if (((tld4.mask >> element) & 1) == 0) {
+            continue;
+        }
+        v.F(dest_reg, IR::F32{v.ir.CompositeExtract(sample, element)});
+        ++dest_reg;
+    }
+    if (tld4.sparse_pred != IR::Pred::PT) {
+        v.ir.SetPred(tld4.sparse_pred, v.ir.LogicalNot(v.ir.GetSparseFromOp(sample)));
+    }
+}
+} // Anonymous namespace
+
+void TranslatorVisitor::TLD4(u64 insn) {
+    union {
+        u64 raw;
+        BitField<56, 2, ComponentType> component;
+        BitField<54, 2, OffsetType> offset;
+    } const tld4{insn};
+    Impl(*this, insn, tld4.component, tld4.offset, false);
+}
+
+void TranslatorVisitor::TLD4_b(u64 insn) {
+    union {
+        u64 raw;
+        BitField<38, 2, ComponentType> component;
+        BitField<36, 2, OffsetType> offset;
+    } const tld4{insn};
+    Impl(*this, insn, tld4.component, tld4.offset, true);
+}
+
+} // namespace Shader::Maxwell