Is there a way to use GL_RGBA8 on the iPhone/iPad? My textures show up as blank when I try to use GL_RGBA8_OES instead. GL_RGBA is causing problem when using transparency.
I haven't tried it on the real device, only in the simulator.
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A:
GL_RGBA8 is for the render buffer. See http://www.khronos.org/registry/gles/extensions/OES/OES_rgb8_rgba8.txt.
To get 8-bit RGBA textures, when calling glTexImage2D use GL_RGBA as the format and GL_UNSIGNED_BYTE as the type.
If you have problems with transparency not appearing, make sure GL_BLEND is enabled, make sure that glBlendFunc is being used to set up the blending properly, and (for GLES 1.x) double check that the glTexEnv settings are correct. I think that's everything relevant...
brone
2010-10-31 20:33:16
Just occurred to me, this sort of error might be easier to spot if `glGetError` were used after every OpenGL call. `assert(glGetError()==GL_NO_ERROR)` will do for starters. I touch on this in another answer: http://stackoverflow.com/questions/3764173/android-opengl-es-i-cant-make-glulookat-gluperspective-work
brone
2010-10-31 21:17:15