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Slug

Texture Color Inversion, How to...

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How can i inverse the color of a texture i wanna draw, like in a camera film or something like that... Did i have to reload the texture differently or can i re-use the same??? Thx for your help...

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For some unknown reason my textures are displayed with color inverted (i.e. black -> white, white->black).
Once I figure out what went wrong with my program, there's an easy answer for you :-)

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alright, figured out my problem:

I used
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND);
// texture environment color to its default value of (0,0,0,0).

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Quote:
Original post by Slug
How can i inverse the color of a texture i wanna draw, like in a
camera film or something like that... Did i have to reload the texture differently or
can i re-use the same??? Thx for your help...
You can check out glLogicOp, although that will affect the final pixels that would be rendered, not the texels from one texture.

EDIT: To only affect one texture, you can use GL_ARB_texture_env_combine and set a source as GL_TEXTURE with its operand as GL_ONE_MINUS_SRC_COLOR. Read the spec and come back if you have any questions.

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