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perf(window): ring buffer for CRAFTER_TIMING frame times (#44)

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Replace the std::vector<nanoseconds> frameTimes plus
erase(begin()) with a fixed-size std::array ring buffer (head +
count). The previous code memmoved ~99 elements left every frame once
the window filled. LogTiming computes order-independent sum/avg/min/max,
so the ring's write order is irrelevant to the reported stats.

Behind CRAFTER_TIMING only; shipping builds are unaffected.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
catbot 2026-06-16 15:25:22 +00:00
commit 41d99890c1
2 changed files with 26 additions and 17 deletions
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9
interfaces/Crafter.Graphics-Window.cppm
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@ -164,7 +164,14 @@ export namespace Crafter {
std::chrono::nanoseconds vblank;
std::chrono::nanoseconds totalFrame;
std::chrono::time_point<std::chrono::high_resolution_clock> frameEnd;
std::vector<std::chrono::nanoseconds> frameTimes;
// Fixed-size ring buffer of the most recent frame times. LogTiming does
// order-independent sum/avg/min/max, so head position is irrelevant to
// the reported stats; this avoids the per-frame memmove a vector::erase
// at the front would incur once full.
static constexpr std::size_t frameTimeCapacity = 100;
std::array<std::chrono::nanoseconds, frameTimeCapacity> frameTimes{};
std::size_t frameTimesHead = 0;
std::size_t frameTimesCount = 0;
void LogTiming();
#endif