glBlendColor — set the blend color
void glBlendColor( | GLclampf | red, |
GLclampf | green, | |
GLclampf | blue, | |
GLclampf | alpha) ; |
The GL_BLEND_COLOR
may be used to calculate the source and destination
blending factors. The color components are clamped to the range
GL_BLEND_COLOR
is set to (0, 0, 0, 0).
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