OpenGL函数解析-glReadBuffer
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glReadBuffer
NAME
glReadBuffer -- select a color buffer source for pixelsC SPECIFICATION
void glReadBuffer(GLenum mode)
PARAMETERS
- mode
- Specifies a color buffer. Accepted values are GL_FRONT_LEFT, GL_FRONT_RIGHT, GL_BACK_LEFT, GL_BACK_RIGHT, GL_FRONT, GL_BACK, GL_LEFT, GL_RIGHT, and GL_AUXi, where i is between 0 and GL_AUX_BUFFERS - 1.
DESCRIPTION
glReadBuffer specifies a color buffer as the source for subsequent glReadPixels and glCopyPixels commands. mode accepts one of twelve or more predefined values. (GL_AUX0 through GL_AUX3 are always defined.) In a fully configured system, GL_FRONT, GL_LEFT, and GL_FRONT_LEFT all name the front left buffer, GL_FRONT_RIGHT and GL_RIGHT name the front right buffer, and GL_BACK_LEFT and GL_BACK name the back left buffer.Nonstereo double-buffered configurations have only a front left and a back left buffer. Single-buffered configurations have a front left and a front right buffer if stereo, and only a front left buffer if nonstereo. It is an error to specify a nonexistent buffer to glReadBuffer.
By default, mode is GL_FRONT in single-buffered configurations, and GL_BACK in double-buffered configurations.
ERRORS
GL_INVALID_ENUM is generated if mode is none of the twelve (or more) accepted values.GL_INVALID_OPERATION is generated if mode specifies a buffer that does not exist.
GL_INVALID_OPERATION is generated if glReadBuffer is called between a call to glBegin and the corresponding call to glEnd.
ASSOCIATED GETS
glGet with argument GL_READ_BUFFERSEE ALSO
glCopyPixels, glDrawBuffer, glReadPixelsback to the OpenGL index page
© 1995 Uwe Behrens. All rights reserved.
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