Implement EFB copy filter and gamma in hardware backends

Also makes y_scale a dynamic parameter for EFB copies, as it doesn't
make sense to keep it as part of the uid, otherwise we're generating
redundant shaders.

Source/Core/VideoBackends/OGL/TextureConverter.h

@@ -7,10 +7,9 @@
 #include "Common/CommonTypes.h"
 #include "Common/GL/GLUtil.h"
 
+#include "VideoCommon/TextureCacheBase.h"
 #include "VideoCommon/VideoCommon.h"
 
-struct EFBCopyParams;
-
 namespace OGL
 {
 // Converts textures between formats using shaders
@@ -21,9 +20,11 @@ void Init();
 void Shutdown();
 
 // returns size of the encoded data (in bytes)
-void EncodeToRamFromTexture(u8* dest_ptr, const EFBCopyParams& params, u32 native_width,
-                            u32 bytes_per_row, u32 num_blocks_y, u32 memory_stride,
-                            const EFBRectangle& src_rect, bool scale_by_half);
+void EncodeToRamFromTexture(
+    u8* dest_ptr, const EFBCopyParams& params, u32 native_width, u32 bytes_per_row,
+    u32 num_blocks_y, u32 memory_stride, const EFBRectangle& src_rect, bool scale_by_half,
+    float y_scale, float gamma, float clamp_top, float clamp_bottom,
+    const TextureCacheBase::CopyFilterCoefficientArray& filter_coefficients);
 }
 
 }  // namespace OGL