Initial support of Geometry shaders (#1244)

* video_core: initial GS support

* fix for components mapping; missing prim type

src/shader_recompiler/frontend/copy_shader.h

@@ -0,0 +1,21 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <span>
+#include <unordered_map>
+
+#include "common/types.h"
+#include "shader_recompiler/ir/attribute.h"
+
+namespace Shader {
+
+struct CopyShaderData {
+    std::unordered_map<u32, std::pair<Shader::IR::Attribute, u32>> attr_map;
+    u32 num_attrs{0};
+};
+
+CopyShaderData ParseCopyShader(const std::span<const u32>& code);
+
+} // namespace Shader