changing color of a luminance/alpha bitmap

OpenGL OpenGL: Basic Coding
1

Hello,

I have a problem I cannot solve.
In my programme I put a luminance_alpha bitmap
on the color-buffer. The result is a white image
(a letter/digit). I would like to be able to set
the color, but my first attempts ver unsuccessful.
glPixelTransferf(GL_RED_SCALE,float®)
worked fine, but soooo sloooooow. Is there another
technique to set the color? Low level conversion
of the luminance_alpha bitmap to RGBA is not an
option.

Thanks,
Frits

2

If you’re using textured quads/triangles, you can set the texture environment to GL_MODULATE and set the primary color to the desired values.

Nico

3

Is using textures the only way? I thought about that, but converting many bitmaps into textures and placing them does seem a long detour to me.

Frits