shader_recompiler: Implement linear interpolation support (#3055)

src/shader_recompiler/ir/attribute.h

@@ -83,6 +83,16 @@ enum class Attribute : u64 {
     Max,
 };
 
+enum class Interpolation {
+    Invalid = 0,
+    PerspectiveSample = 1,
+    PerspectiveCenter = 2,
+    PerspectiveCentroid = 3,
+    LinearSample = 4,
+    LinearCenter = 5,
+    LinearCentroid = 6,
+};
+
 constexpr size_t NumAttributes = static_cast<size_t>(Attribute::Max);
 constexpr size_t NumRenderTargets = 8;
 constexpr size_t NumParams = 32;
@@ -104,6 +114,15 @@ constexpr bool IsMrt(Attribute attribute) noexcept {
     return attribute >= Attribute::RenderTarget0 && attribute <= Attribute::RenderTarget7;
 }
 
+constexpr bool IsLinear(Interpolation interp) noexcept {
+    return interp >= Interpolation::LinearSample && interp <= Interpolation::LinearCentroid;
+}
+
+constexpr bool IsPerspective(Interpolation interp) noexcept {
+    return interp >= Interpolation::PerspectiveSample &&
+           interp <= Interpolation::PerspectiveCentroid;
+}
+
 [[nodiscard]] std::string NameOf(Attribute attribute);
 
 [[nodiscard]] constexpr Attribute operator+(Attribute attr, int num) {

src/shader_recompiler/ir/ir_emitter.cpp

@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <array>
-#include <bit>
 #include <source_location>
 #include <boost/container/small_vector.hpp>
 #include "common/assert.h"

src/shader_recompiler/ir/ir_emitter.h

@@ -6,7 +6,6 @@
 #include <cstring>
 #include <type_traits>
 
-#include "shader_recompiler/info.h"
 #include "shader_recompiler/ir/attribute.h"
 #include "shader_recompiler/ir/basic_block.h"
 #include "shader_recompiler/ir/condition.h"
@@ -17,6 +16,7 @@ namespace Shader::IR {
 
 class IREmitter {
 public:
+    explicit IREmitter() = default;
     explicit IREmitter(Block& block_) : block{&block_}, insertion_point{block->end()} {}
     explicit IREmitter(Block& block_, Block::iterator insertion_point_)
         : block{&block_}, insertion_point{insertion_point_} {}

src/shader_recompiler/ir/reg.h

@@ -7,7 +7,7 @@
 #include "common/bit_field.h"
 #include "common/enum.h"
 #include "common/types.h"
-#include "video_core/amdgpu/types.h"
+#include "video_core/amdgpu/pixel_format.h"
 
 namespace Shader::IR {