V2 working

apps/RenderCadenceCompositor/render/Bgra8ReadbackPipeline.h

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+#pragma once
+
+#include "PboReadbackRing.h"
+#include "VideoIOFormat.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+
+struct SystemFrame;
+
+class Bgra8ReadbackPipeline
+{
+public:
+	using RenderCallback = std::function<void(uint64_t frameIndex)>;
+	using AcquireFrameCallback = std::function<bool(SystemFrame& frame)>;
+	using PublishFrameCallback = std::function<bool(const SystemFrame& frame)>;
+	using CounterCallback = std::function<void()>;
+
+	Bgra8ReadbackPipeline() = default;
+	Bgra8ReadbackPipeline(const Bgra8ReadbackPipeline&) = delete;
+	Bgra8ReadbackPipeline& operator=(const Bgra8ReadbackPipeline&) = delete;
+	~Bgra8ReadbackPipeline();
+
+	bool Initialize(unsigned width, unsigned height, std::size_t pboDepth);
+	void Shutdown();
+
+	bool RenderAndQueue(uint64_t frameIndex, const RenderCallback& renderFrame);
+	void ConsumeCompleted(
+		const AcquireFrameCallback& acquireFrame,
+		const PublishFrameCallback& publishFrame,
+		const CounterCallback& onAcquireMiss = {},
+		const CounterCallback& onCompleted = {});
+
+	GLuint Framebuffer() const { return mFramebuffer; }
+	unsigned Width() const { return mWidth; }
+	unsigned Height() const { return mHeight; }
+	unsigned RowBytes() const { return mRowBytes; }
+	VideoIOPixelFormat PixelFormat() const { return VideoIOPixelFormat::Bgra8; }
+	uint64_t PboQueueMisses() const { return mPboRing.QueueMisses(); }
+
+private:
+	bool CreateRenderTarget();
+	void DestroyRenderTarget();
+
+	unsigned mWidth = 0;
+	unsigned mHeight = 0;
+	unsigned mRowBytes = 0;
+	GLuint mFramebuffer = 0;
+	GLuint mTexture = 0;
+	PboReadbackRing mPboRing;
+};