shader: Implement TMML partially

2 files changed, 130 insertions, 8 deletions

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 7e1ad63e1..9f5ea7775 100644
--- a/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp
@@ -313,14 +313,6 @@ void TranslatorVisitor::SYNC(u64) {
     ThrowNotImplemented(Opcode::SYNC);
 }
 
-void TranslatorVisitor::TMML(u64) {
-    ThrowNotImplemented(Opcode::TMML);
-}
-
-void TranslatorVisitor::TMML_b(u64) {
-    ThrowNotImplemented(Opcode::TMML_b);
-}
-
 void TranslatorVisitor::TXA(u64) {
     ThrowNotImplemented(Opcode::TXA);
 }
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/texture_mipmap_level.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/texture_mipmap_level.cpp
new file mode 100644
index 000000000..ee13ede30
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/texture_mipmap_level.cpp
@@ -0,0 +1,130 @@
+// 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, 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(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);
+}
+
+void Impl(TranslatorVisitor& v, u64 insn, bool is_bindless) {
+    union {
+        u64 raw;
+        BitField<49, 1, u64> nodep;
+        BitField<35, 1, u64> ndv;
+        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 tmml{insn};
+
+    if ((tmml.mask & 0xC) != 0) {
+        throw NotImplementedException("TMML BA results are not implmented");
+    }
+
+    IR::F32 transform_constant = v.ir.Imm32(256.0f);
+
+    const IR::Value coords{MakeCoords(v, tmml.coord_reg, tmml.type)};
+
+    IR::U32 handle;
+    IR::Reg meta_reg{tmml.meta_reg};
+    if (!is_bindless) {
+        handle = v.ir.Imm32(static_cast<u32>(tmml.cbuf_offset.Value() * 4));
+    } else {
+        handle = v.X(meta_reg++);
+    }
+    IR::TextureInstInfo info{};
+    info.type.Assign(GetType(tmml.type, false));
+    const IR::Value sample{
+        [&]() -> IR::Value { return v.ir.ImageQueryLod(handle, coords, info); }()};
+
+    const IR::FpControl fp_control{
+        .no_contraction{false},
+        .rounding{IR::FpRounding::RP},
+        .fmz_mode{IR::FmzMode::FTZ},
+    };
+    IR::Reg dest_reg{tmml.dest_reg};
+    for (size_t element = 0; element < 4; ++element) {
+        if (((tmml.mask >> element) & 1) == 0) {
+            continue;
+        }
+        IR::F32 value = IR::F32{v.ir.CompositeExtract(sample, element)};
+        v.F(dest_reg,
+            element < 2 ? IR::F32{v.ir.FPMul(value, transform_constant, fp_control)} : value);
+        ++dest_reg;
+    }
+}
+} // Anonymous namespace
+
+void TranslatorVisitor::TMML(u64 insn) {
+    Impl(*this, insn, false);
+}
+
+void TranslatorVisitor::TMML_b(u64 insn) {
+    Impl(*this, insn, true);
+}
+
+} // namespace Shader::Maxwell