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using opengl to draw individual pixels

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make/change the image data , upload it into a texture with glTexSubImage2D(..) and draw that texture on the screen


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there is also glDrawPixels, but usually implemented very poorly.
glBegin( GL_POINTS ) might work for you too, but changing the colours will be lots of state changes and points are usually not implemented all that fast either.

Brett Porter
PortaLib3D : A portable 3D game/demo libary for OpenGL

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