1 files changed, 236 insertions, 0 deletions
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/texture_fetch.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/texture_fetch.cpp
new file mode 100644
index 000000000..0046b5edd
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/texture_fetch.cpp
@@ -0,0 +1,236 @@
+// 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 Blod : u64 {
+    None,
+    LZ,
+    LB,
+    LL,
+    INVALIDBLOD4,
+    INVALIDBLOD5,
+    LBA,
+    LLA,
+};
+
+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 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(v.F(reg + 1), read_array());
+    case TextureType::_2D:
+        return v.ir.CompositeConstruct(v.F(reg), v.F(reg + 1));
+    case TextureType::ARRAY_2D:
+        return v.ir.CompositeConstruct(v.F(reg + 1), v.F(reg + 2), read_array());
+    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(v.F(reg + 1), v.F(reg + 2), v.F(reg + 3), read_array());
+    }
+    throw NotImplementedException("Invalid texture type {}", type);
+}
+
+IR::F32 MakeLod(TranslatorVisitor& v, IR::Reg& reg, Blod blod) {
+    switch (blod) {
+    case Blod::None:
+        return v.ir.Imm32(0.0f);
+    case Blod::LZ:
+        return v.ir.Imm32(0.0f);
+    case Blod::LB:
+    case Blod::LL:
+    case Blod::LBA:
+    case Blod::LLA:
+        return v.F(reg++);
+    case Blod::INVALIDBLOD4:
+    case Blod::INVALIDBLOD5:
+        break;
+    }
+    throw NotImplementedException("Invalid blod {}", blod);
+}
+
+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(4), true);
+    case TextureType::_2D:
+    case TextureType::ARRAY_2D:
+        return v.ir.CompositeConstruct(
+            v.ir.BitFieldExtract(value, v.ir.Imm32(0), v.ir.Imm32(4), true),
+            v.ir.BitFieldExtract(value, v.ir.Imm32(4), v.ir.Imm32(4), true));
+    case TextureType::_3D:
+    case TextureType::ARRAY_3D:
+        return v.ir.CompositeConstruct(
+            v.ir.BitFieldExtract(value, v.ir.Imm32(0), v.ir.Imm32(4), true),
+            v.ir.BitFieldExtract(value, v.ir.Imm32(4), v.ir.Imm32(4), true),
+            v.ir.BitFieldExtract(value, v.ir.Imm32(8), v.ir.Imm32(4), true));
+    case TextureType::CUBE:
+    case TextureType::ARRAY_CUBE:
+        throw NotImplementedException("Illegal offset on CUBE sample");
+    }
+    throw NotImplementedException("Invalid texture type {}", type);
+}
+
+bool HasExplicitLod(Blod blod) {
+    switch (blod) {
+    case Blod::LL:
+    case Blod::LLA:
+    case Blod::LZ:
+        return true;
+    default:
+        return false;
+    }
+}
+
+void Impl(TranslatorVisitor& v, u64 insn, bool aoffi, Blod blod, bool lc,
+          std::optional<u32> cbuf_offset) {
+    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;
+    } const tex{insn};
+
+    if (lc) {
+        throw NotImplementedException("LC");
+    }
+    const IR::Value coords{MakeCoords(v, tex.coord_reg, tex.type)};
+
+    IR::Reg meta_reg{tex.meta_reg};
+    IR::Value handle;
+    IR::Value offset;
+    IR::F32 dref;
+    IR::F32 lod_clamp;
+    if (cbuf_offset) {
+        handle = v.ir.Imm32(*cbuf_offset);
+    } else {
+        handle = v.X(meta_reg++);
+    }
+    const IR::F32 lod{MakeLod(v, meta_reg, blod)};
+    if (aoffi) {
+        offset = MakeOffset(v, meta_reg, tex.type);
+    }
+    if (tex.dc != 0) {
+        dref = v.F(meta_reg++);
+    }
+    IR::TextureInstInfo info{};
+    info.type.Assign(GetType(tex.type));
+    info.is_depth.Assign(tex.dc != 0 ? 1 : 0);
+    info.has_bias.Assign(blod == Blod::LB || blod == Blod::LBA ? 1 : 0);
+    info.has_lod_clamp.Assign(lc ? 1 : 0);
+
+    const IR::Value sample{[&]() -> IR::Value {
+        if (tex.dc == 0) {
+            if (HasExplicitLod(blod)) {
+                return v.ir.ImageSampleExplicitLod(handle, coords, lod, offset, info);
+            } else {
+                return v.ir.ImageSampleImplicitLod(handle, coords, lod, offset, lod_clamp, info);
+            }
+        }
+        if (HasExplicitLod(blod)) {
+            return v.ir.ImageSampleDrefExplicitLod(handle, coords, dref, lod, offset, info);
+        } else {
+            return v.ir.ImageSampleDrefImplicitLod(handle, coords, dref, lod, offset, lod_clamp,
+                                                   info);
+        }
+    }()};
+
+    IR::Reg dest_reg{tex.dest_reg};
+    for (int element = 0; element < 4; ++element) {
+        if (((tex.mask >> element) & 1) == 0) {
+            continue;
+        }
+        IR::F32 value;
+        if (tex.dc != 0) {
+            value = element < 3 ? IR::F32{sample} : v.ir.Imm32(1.0f);
+        } else {
+            value = IR::F32{v.ir.CompositeExtract(sample, static_cast<size_t>(element))};
+        }
+        v.F(dest_reg, value);
+        ++dest_reg;
+    }
+    if (tex.sparse_pred != IR::Pred::PT) {
+        v.ir.SetPred(tex.sparse_pred, v.ir.LogicalNot(v.ir.GetSparseFromOp(sample)));
+    }
+}
+} // Anonymous namespace
+
+void TranslatorVisitor::TEX(u64 insn) {
+    union {
+        u64 raw;
+        BitField<54, 1, u64> aoffi;
+        BitField<55, 3, Blod> blod;
+        BitField<58, 1, u64> lc;
+        BitField<36, 13, u64> cbuf_offset;
+    } const tex{insn};
+
+    Impl(*this, insn, tex.aoffi != 0, tex.blod, tex.lc != 0, static_cast<u32>(tex.cbuf_offset * 4));
+}
+
+void TranslatorVisitor::TEX_b(u64 insn) {
+    union {
+        u64 raw;
+        BitField<36, 1, u64> aoffi;
+        BitField<37, 3, Blod> blod;
+        BitField<40, 1, u64> lc;
+    } const tex{insn};
+
+    Impl(*this, insn, tex.aoffi != 0, tex.blod, tex.lc != 0, std::nullopt);
+}
+
+} // namespace Shader::Maxwell