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46 lines
1.7 KiB
Markdown
46 lines
1.7 KiB
Markdown
**_glColorMask, glColorMaski:** enable and disable writing of frame buffer color components
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## Syntax
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> : SUB _glColorMask (BYVAL red AS _UNSIGNED _BYTE, BYVAL green AS _UNSIGNED _BYTE, BYVAL blue AS _UNSIGNED _BYTE, BYVAL alpha AS _UNSIGNED _BYTE)
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> : void **_glColorMask**(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);
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> : void **_glColorMaski**(GLuint buf, GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);
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; buf
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> For **_glColorMaski**, specifies the index of the draw buffer whose color mask to set.
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; red, green, blue, alpha
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> Specify whether red, green, blue, and alpha are to be written into the frame buffer. The initial values are all [_GL_TRUE](_GL_TRUE), indicating that the color components are written.
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## Description
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**_glColorMask** and **_glColorMaski** specify whether the individual color components in the frame buffer can or cannot be written. **_glColorMaski** sets the mask for a specific draw buffer, whereas **_glColorMask** sets the mask for all draw buffers. If red is [_GL_FALSE](_GL_FALSE), for example, no change is made to the red component of any pixel in any of the color buffers, regardless of the drawing operation attempted.
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Changes to individual bits of components cannot be controlled. Rather, changes are either enabled or disabled for entire color components.
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## Error(s)
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[_GL_INVALID_VALUE](_GL_INVALID_VALUE) is generated if buf is greater than [_GL_MAX_DRAW_BUFFERS](_GL_MAX_DRAW_BUFFERS) minus 1.
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## Use With
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[_glGet](_glGet) with argument [_GL_COLOR_WRITEMASK](_GL_COLOR_WRITEMASK)
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## See Also
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[_GL](_GL)
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[_glClear](_glClear), [_glClearBuffer](_glClearBuffer), [_glDepthMask](_glDepthMask), [_glStencilMask](_glStencilMask)
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