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Answer 1

+3 A:

Try setting some GL attributes before your SDL_SetVideoMode() call:

SDL_GL_SetAttribute(SDL_GL_RED_SIZE,     5);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE,   5);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,    5);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE,   5);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,   16);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

Also, pass in SDL_OPENGL instead of SDL_HWSURFACE | SDL_DOUBLEBUF:

if (!(surf = SDL_SetVideoMode(sx, sy, bpp, SDL_OPENGL)))

genpfault 2010-05-17 18:19:10

Thanks very much for the tips. I modified my question so I could post a version that works. The SDL_OPENGL was definitely an issue. In the working version, if I put SDL_HWSURFACE|SDL_DOUBLEBUF back in there, it would go black again. But replacing them with SDL_OPENGL in the original code doesn't help. Also, the working code works fine without the SDL_GL_SetAttribute() calls, although it's probably a good idea to make those calls.

Lococo 2010-05-17 19:33:00

Answer 2

+4 A:

In the first code block, change your glColor3b() call to glColor3ub(). Or pass in 127 instead of 255.

genpfault 2010-05-17 21:07:53

OMIGOSH! That's it! Thanks a million, sir, you are a genius. :)

Lococo 2010-05-17 22:04:58

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SDL+OpenGL app: blank screen

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