LibGPU: Add basic shader IR

This adds a header to LibGPU with a basic IR for vertex and fragment
shaders.

Userland/Libraries/LibGPU/IR.h

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2022, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/String.h>
+#include <AK/Vector.h>
+
+namespace GPU::IR {
+
+enum class Opcode {
+    Move,
+};
+
+enum class StorageLocation {
+    Constant,
+    Uniform,
+    Input,
+    Output,
+    Temporary,
+};
+
+enum class StorageType {
+    Float,
+    Vector2,
+    Vector3,
+    Vector4,
+    Matrix3x3,
+    Matrix4x4,
+};
+
+struct StorageReference final {
+    StorageLocation location;
+    size_t index;
+};
+
+struct Instruction final {
+    Opcode operation;
+    Vector<StorageReference> arguments;
+    StorageReference result;
+};
+
+struct Constant final {
+    StorageType type;
+    union {
+        float float_values[16];
+    };
+};
+
+struct Uniform final {
+    String name;
+    StorageType type;
+};
+
+struct Input final {
+    String name;
+    StorageType type;
+};
+
+struct Output final {
+    String name;
+    StorageType type;
+};
+
+struct Temporary final {
+    StorageType type;
+};
+
+struct Shader final {
+    Vector<Constant> constants;
+    Vector<Uniform> uniforms;
+    Vector<Temporary> temporaries;
+    Vector<Instruction> instructions;
+};
+
+}