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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