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48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
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#pragma once
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#include <inttypes.h>
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void InitGPU(void);
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void DeinitGPU(void);
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void AddHistogramSample(uint64_t t);
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bool SnapshotFramebuffer(uint16_t *destination);
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bool IsNewFramebuffer(uint16_t *possiblyNewFramebuffer, uint16_t *oldFramebuffer);
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uint64_t EstimateFrameRateInterval(void);
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uint64_t PredictNextFrameArrivalTime(void);
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extern uint16_t *videoCoreFramebuffer[2];
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extern volatile int numNewGpuFrames;
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extern int displayXOffset;
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extern int displayYOffset;
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extern int gpuFrameWidth;
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extern int gpuFrameHeight;
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extern int gpuFramebufferScanlineStrideBytes;
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extern int gpuFramebufferSizeBytes;
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extern int excessPixelsLeft;
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extern int excessPixelsRight;
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extern int excessPixelsTop;
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extern int excessPixelsBottom;
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#define FRAME_HISTORY_MAX_SIZE 240
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extern int frameTimeHistorySize;
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struct FrameHistory
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{
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uint64_t time;
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bool interlaced;
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};
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extern FrameHistory frameTimeHistory[FRAME_HISTORY_MAX_SIZE];
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#define HISTOGRAM_SIZE 240
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extern uint64_t frameArrivalTimes[HISTOGRAM_SIZE];
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extern uint64_t frameArrivalTimesTail;
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extern int histogramSize;
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// Returns Nth most recent entry in the frame times histogram, 0 = most recent, (histogramSize-1) = oldest
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#define GET_HISTOGRAM(idx) frameArrivalTimes[(frameArrivalTimesTail - 1 - (idx) + HISTOGRAM_SIZE) % HISTOGRAM_SIZE]
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// Source framebuffer captured from DispmanX is (currently) always 16-bits R5G6B5
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#define FRAMEBUFFER_BYTESPERPIXEL 2
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