glBlendColor - OpenGL 4 Reference Pages

## Name

glBlendColor — set the blend color

## C Specification

`void glBlendColor(` | GLfloat red,
| GLfloat green,
| GLfloat blue,
| GLfloat alpha`)`;

## Parameters

`red`, `green`, `blue`, `alpha`

  specify the components of `GL_BLEND_COLOR`

## Description

The `GL_BLEND_COLOR` may be used to calculate the source and destination blending factors. The color components are clamped to the range 0 1 before being stored. See glBlendFunc for a complete description of the blending operations. Initially the `GL_BLEND_COLOR` is set to (0, 0, 0, 0).

## Notes

The type of the `red`, `green`, `blue`, and `alpha` parameters was changed from GLclampf to GLfloat. This change is transparent to user code and is described in detail on the removedTypes page.

## Associated Gets

glGet with an argument of `GL_BLEND_COLOR`

## Version Support

| OpenGL Version
--- | ---
Function / Feature Name | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5
`glBlendColor` | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔

## See Also

glBlendEquation, glBlendFunc, glGetString, removedTypes

## Copyright

Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.