Add new flag that will simplify the GL path

GPU/Common/FramebufferManagerCommon.cpp

@@ -3185,9 +3185,9 @@ bool GetOutputFramebuffer(Draw::DrawContext *draw, GPUDebugBuffer &buffer) {
 	if (fmt != Draw::DataFormat::B8G8R8A8_UNORM)
 		fmt = Draw::DataFormat::R8G8B8A8_UNORM;
 
-	bool flipped = g_Config.iGPUBackend == (int)GPUBackend::OPENGL;
+	bool flipY = g_Config.iGPUBackend == (int)GPUBackend::OPENGL;
 
-	buffer.Allocate(w, h, fmt == Draw::DataFormat::R8G8B8A8_UNORM ? GPU_DBG_FORMAT_8888 : GPU_DBG_FORMAT_8888_BGRA, flipped);
+	buffer.Allocate(w, h, fmt == Draw::DataFormat::R8G8B8A8_UNORM ? GPU_DBG_FORMAT_8888 : GPU_DBG_FORMAT_8888_BGRA, flipY);
 	buffer.SetIsBackbuffer(true);
 	return draw->CopyFramebufferToMemory(nullptr, Draw::Aspect::COLOR_BIT, 0, 0, w, h, fmt, buffer.GetData(), w, Draw::ReadbackMode::BLOCK, "GetOutputFramebuffer");
 }

GPU/GLES/GPU_GLES.cpp

@@ -190,6 +190,11 @@ u32 GPU_GLES::CheckGPUFeatures() const {
 			features |= GPU_ROUND_DEPTH_TO_16BIT;
 		}
 	}
+
+	if (!g_Config.bSkipBufferEffects) {
+		features |= GPU_USE_BUFFERED_FLIP;
+	}
+
 	return features;
 }
 

GPU/GPUState.h

@@ -480,6 +480,7 @@ enum {
 	GPU_USE_CLIP_DISTANCE = FLAG_BIT(24),
 	GPU_USE_CULL_DISTANCE = FLAG_BIT(25),
 	GPU_USE_SHADER_BLENDING = FLAG_BIT(26),  // This is set to false when skip buffer effects is enabled and GPU_USE_FRAMEBUFFER_FETCH is not.
+	GPU_USE_BUFFERED_FLIP = FLAG_BIT(27),  // We use a flip hack to pretend the coordinate system is right-side-up, except if buffered rendering is off.
 
 	// VR flags (reserved or in-use)
 	GPU_USE_VIRTUAL_REALITY = FLAG_BIT(29),