post-processing test

src/graphics/PostProcessing.h

@@ -0,0 +1,37 @@
+#ifndef GRAPHICS_POST_PROCESSING_H_
+#define GRAPHICS_POST_PROCESSING_H_
+
+#include "Viewport.h"
+#include "GfxContext.h"
+
+#include <memory>
+
+class Mesh;
+class Shader;
+class Framebuffer;
+
+/// @brief Framebuffer with blitting with shaders.
+/// @attention Current implementation does not support multiple render passes 
+/// for multiple effects. Will be implemented in v0.21
+class PostProcessing {
+    /// @brief Main framebuffer (lasy field)
+    std::unique_ptr<Framebuffer> fbo;
+    /// @brief Fullscreen quad mesh as the post-processing canvas
+    std::unique_ptr<Mesh> quadMesh;
+public:
+    PostProcessing();
+    ~PostProcessing();
+
+    /// @brief Prepare and bind framebuffer
+    /// @param context graphics context will be modified
+    void use(GfxContext& context);
+
+    /// @brief Render fullscreen quad using the passed shader 
+    /// with framebuffer texture bound
+    /// @param context graphics context
+    /// @param screenShader shader used for fullscreen quad
+    /// @throws std::runtime_error if use(...) wasn't called before
+    void render(GfxContext& context, Shader* screenShader);
+};
+
+#endif // GRAPHICS_POST_PROCESSING_H_