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| ALLEGRO_OPENGL issue. |
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albert69
Member #17,055
March 2019
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Hi When I use the ALLEGRO_OPENGL option when using al_set_new_display_flags it causes an issue with scrolling performance - like some minor jittering in the scrolling sprites. fps is still running fine at 60fps, just with worse looking sprite movement. Only happens in ALLEGRO_FULLSCREEN mode though. Do not believe it is anything to do with ALLEGRO_VSYNC as have tested all combos. Any ideas why this may be happening? Thank You. |
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amarillion
Member #940
January 2001
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Do you get exactly the same resolution when in ALLEGRO_FULLSCREEN / ALLEGRO_WINDOW? If the resolution changes, maybe that explains it? -- |
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albert69
Member #17,055
March 2019
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Hi Game settings are 1280x720. Even if my monitor is set to same display setting of 1280x720, when I run the program in windowed version, everything is smooth. But ran in fullscreen at 1280x720 is a little jittery, even though they are the same size on my monitor. Both run versions (fullscreen and windowed) even match my monitor resolution. (lowered from 1920x1080 to test) Edit: But when I remove the ALLEGRO_OPENGL flag, fullscreen is smooth. Thank You. |
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Dizzy Egg
Member #10,824
March 2009
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I have the same problem albert69, it runs fine in DirectX (default), but OpenGL stutters when scrolling. It's definitely an Allegro bug, because when I create an OpenGL program without Allegro, I don't get the same problem. I believe it's down to the Allegro timer/events, but I haven't been able to fix it yet.
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albert69
Member #17,055
March 2019
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Hi Thanks for that info Dizzy Egg. Yes, DIRECTX mode is fine with me also. Annoying, as need OPENGL for my GLSL shaders. Thank You. |
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Dizzy Egg
Member #10,824
March 2009
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We're in exactly the same position! I only really use GLSL with Allegro because it allows far more calculations than HLSL. For that reason I continue to use OpenGL. I did improve performance by not calling al_flip_display() but by calling glSwapBuffers() and some calls to glDrawBuffer(). It didn't fix it completely, but made it more tolerable.
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Elias
Member #358
May 2000
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There is a weird glFlush() call in the WGL al_flip_display: https://github.com/liballeg/allegro5/blob/master/src/win/wgl_disp.c#L1315 I doubt it's the cause for this but if not harmful it certainly is superfluous. -- |
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