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OpenGL® Extension: EXT_texture_env_add
The texture_env_add extension gives the programmer access
to an additive texture environment mode in addition to
the GL_MODULATE, GL_REPLACE, GL_DECAL and GL_BLEND texture
environments already available. After confirming that
this extension is supported with a call to glGetString(GL_EXTENSIONS),
using it is as simple as passing GL_ADD to glTexEnv().
This extension is particularly useful with ARB_multitexture
to create specular or other additive effects.
- Sample Applications using EXT_texture_env_add
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