63 lines
1.3 KiB
C++
63 lines
1.3 KiB
C++
#pragma once
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#include "GLExtensions.h"
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#include <cstddef>
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#include <cstdint>
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#include <vector>
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class PboReadbackRing
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{
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public:
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struct CompletedReadback
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{
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GLuint pbo = 0;
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uint64_t frameIndex = 0;
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std::size_t byteCount = 0;
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};
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struct ReadbackRequest
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{
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GLuint framebuffer = 0;
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unsigned width = 0;
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unsigned height = 0;
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GLenum format = GL_BGRA;
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GLenum type = GL_UNSIGNED_INT_8_8_8_8_REV;
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uint64_t frameIndex = 0;
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};
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PboReadbackRing() = default;
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PboReadbackRing(const PboReadbackRing&) = delete;
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PboReadbackRing& operator=(const PboReadbackRing&) = delete;
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~PboReadbackRing();
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bool Initialize(std::size_t depth, std::size_t byteCount);
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void Shutdown();
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bool QueueReadback(const ReadbackRequest& request);
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bool TryAcquireCompleted(CompletedReadback& readback);
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void ReleaseCompleted(const CompletedReadback& readback);
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void DrainCompleted();
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std::size_t Depth() const { return mSlots.size(); }
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uint64_t QueueMisses() const { return mQueueMisses; }
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private:
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struct Slot
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{
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GLuint pbo = 0;
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GLsync fence = nullptr;
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bool inFlight = false;
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bool acquired = false;
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uint64_t frameIndex = 0;
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};
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void ResetSlot(Slot& slot);
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std::vector<Slot> mSlots;
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std::size_t mWriteIndex = 0;
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std::size_t mReadIndex = 0;
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std::size_t mByteCount = 0;
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uint64_t mQueueMisses = 0;
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};
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