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AI-generatedSDL_RENDERER_PRESENTVSYNC Across Backend Drivers
The objective is to establish repeatable frame pacing for SDL2 and SDL3 applications across diverse render backends (Direct3D, OpenGL, Metal, Vulkan, software) without per-backend adaptation. SDL_RENDERER_PRESENTVSYNC (SDL2) or SDL_SetRenderVSync (SDL3) requests synchronization with the display refresh cycle, but driver and compositor behavior is not guarant
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