Tapani Pälli wrote:
I think there's no guarantee that you will get "HW surface" from SDL, it will silently fallback to SW surface if it cannot have HW one. SDL draws to X, X draws to the framebuffer mapped by kernel which then updates that data to the lcd controller where screen gets finally updated. I would recommend to blit things in memory, then push only needed parts with SDL_UpdateRects trying to avoid fullscreen updates.
Yes. So to draw without tearing effect either X of framebuffer driver should report when to draw (vblank period or which line is currently drawn by hardware) or the controller has to have two buffers so single or multiple SDL_UpdateRects could be pushed to visible screen in one operation (SDL_Flip) in appropriate moment.
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