shader: Add partial rasterizer integration

src/shader_recompiler/environment.h

@@ -3,6 +3,8 @@
 #include <array>
 
 #include "common/common_types.h"
+#include "shader_recompiler/stage.h"
+#include "shader_recompiler/program_header.h"
 
 namespace Shader {
 
@@ -15,6 +17,18 @@ public:
     [[nodiscard]] virtual u32 TextureBoundBuffer() = 0;
 
     [[nodiscard]] virtual std::array<u32, 3> WorkgroupSize() = 0;
+
+    [[nodiscard]] const ProgramHeader& SPH() const noexcept {
+        return sph;
+    }
+
+    [[nodiscard]] Stage ShaderStage() const noexcept {
+        return stage;
+    }
+
+protected:
+    ProgramHeader sph{};
+    Stage stage{};
 };
 
 } // namespace Shader