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(macOS) Reduced the CPU usage significantly while running in the background.

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This commit is contained in:
Leon Styhre 2021-12-14 18:17:46 +01:00
parent 08bba3cbaf
commit 2d8d1e6831
1 changed files with 15 additions and 0 deletions
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15
es-core/src/renderers/Renderer_GL21.cpp
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@ -414,7 +414,22 @@ namespace Renderer
void swapBuffers()
{
#if defined(__APPLE__)
// On macOS when running in the background, the OpenGL driver apparently does not swap
// the frames which leads to a very fast swap time. This makes ES-DE use a lot of CPU
// resources which slows down the games significantly on slower machines. By introducing
// a delay if the swap time is very low we reduce CPU usage while still keeping the
// application functioning normally.
const auto beforeSwap = std::chrono::system_clock::now();
SDL_GL_SwapWindow(getSDLWindow());
const auto afterSwap = std::chrono::system_clock::now();
if (std::chrono::duration_cast<std::chrono::milliseconds>(afterSwap - beforeSwap).count() <
3.0)
SDL_Delay(10);
#else
SDL_GL_SwapWindow(getSDLWindow());
#endif
GL_CHECK_ERROR(glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT));
}