[SDL] SDL, OpenGL, and Drawing only part of the screen

[Trevor Agnitti]

Fellow SDL enthusiasts,
I have a program using SDL and OpenGL, and whenever I need to refresh  
the screen vI call SDL_GL_SwapBuffers();.  But  on slower computers,  
it takes a while to render the whole screen, and it therefore looks  
choppy.  Is there a way to only refresh part of the screen, for  
example like the part that has changed?

I was thinking about using glViewport to only draw to part of the  
screen but I still have to use SDL_GL_SwapBuffers();. to make the  
changes visible.

Is there a way I can only refresh part of the screen?

-Trevor
http://www.lackeyccg.com
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