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if all one needs is a raw framebuffer to the PSP's vram, instead of dealing with renderers and textures, that need to be copied hence and forth, this method allows one to create a window, set the pixel format using SDL_SetWindowDisplayMode() - preferably BGR565 for optimal speed (the other possible natively supported option is ABGR8888) - and then request SDL_GetWindowSurface(), which provides one with a surface with direct framebuffer access. note that the pixels pointer inside the surface will be switched after each call because of double-buffering. it's advisable to overwrite all pixels of the PSP visible area (480x272) to not encounter old data. after writing the pixels, a call to SDL_UpdateWindowSurface() sends the changes to the graphics chip. the result is a raw framerate of 250 fps with BGR565 mode, under optimal circumstances - i.e. nothing else is done than drawing, and the drawing loop is as simple as possible. that leaves about 12 ms per frame for other tasks and still allow a fluent 60 fps.