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gldrawbuffer(3g) [xfree86 man page]

GLDRAWBUFFER(3G)														  GLDRAWBUFFER(3G)

NAME
glDrawBuffer - specify which color buffers are to be drawn into C SPECIFICATION
void glDrawBuffer( GLenum mode ) PARAMETERS
mode Specifies up to four color buffers to be drawn into. Symbolic constants GL_NONE, GL_FRONT_LEFT, GL_FRONT_RIGHT, GL_BACK_LEFT, GL_BACK_RIGHT, GL_FRONT, GL_BACK, GL_LEFT, GL_RIGHT, GL_FRONT_AND_BACK, and GL_AUXi, where i is between 0 and ``GL_AUX_BUFFERS'' -1, are accepted (GL_AUX_BUFFERS is not the upper limit; use glGet to query the number of available aux buffers.) The initial value is GL_FRONT for single-buffered contexts, and GL_BACK for double-buffered contexts. DESCRIPTION
When colors are written to the frame buffer, they are written into the color buffers specified by glDrawBuffer. The specifications are as follows: GL_NONE No color buffers are written. GL_FRONT_LEFT Only the front left color buffer is written. GL_FRONT_RIGHT Only the front right color buffer is written. GL_BACK_LEFT Only the back left color buffer is written. GL_BACK_RIGHT Only the back right color buffer is written. GL_FRONT Only the front left and front right color buffers are written. If there is no front right color buffer, only the front left color buffer is written. GL_BACK Only the back left and back right color buffers are written. If there is no back right color buffer, only the back left color buffer is written. GL_LEFT Only the front left and back left color buffers are written. If there is no back left color buffer, only the front left color buffer is written. GL_RIGHT Only the front right and back right color buffers are written. If there is no back right color buffer, only the front right color buffer is written. GL_FRONT_AND_BACK All the front and back color buffers (front left, front right, back left, back right) are written. If there are no back color buffers, only the front left and front right color buffers are written. If there are no right color buffers, only the front left and back left color buffers are written. If there are no right or back color buf- fers, only the front left color buffer is written. GL_AUXi Only auxiliary color buffer i is written. If more than one color buffer is selected for drawing, then blending or logical operations are computed and applied independently for each color buffer and can produce different results in each buffer. Monoscopic contexts include only left buffers, and stereoscopic contexts include both left and right buffers. Likewise, single-buffered contexts include only front buffers, and double-buffered contexts include both front and back buffers. The context is selected at GL ini- tialization. NOTES
It is always the case that GL_AUXi = GL_AUX0 + i. ERRORS
GL_INVALID_ENUM is generated if mode is not an accepted value. GL_INVALID_OPERATION is generated if none of the buffers indicated by mode exists. GL_INVALID_OPERATION is generated if glDrawBuffer is executed between the execution of glBegin and the corresponding execution of glEnd. ASSOCIATED GETS
glGet with argument GL_DRAW_BUFFER glGet with argument GL_AUX_BUFFERS SEE ALSO
glBlendFunc(3G), glColorMask(3G), glIndexMask(3G), glLogicOp(3G), glReadBuffer(3G) GLDRAWBUFFER(3G)

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GLREADBUFFER(3G)														  GLREADBUFFER(3G)

NAME
glReadBuffer - select a color buffer source for pixels C 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, glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, glCopyTexSubImage3D, 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. mode is initially GL_FRONT in single-buffered configurations, and GL_BACK in double-buffered configurations. ERRORS
GL_INVALID_ENUM is generated if mode is not one 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 executed between the execution of glBegin and the corresponding execution of glEnd. ASSOCIATED GETS
glGet with argument GL_READ_BUFFER SEE ALSO
glCopyPixels, glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, glCopyTexSubImage3D, glDrawBuffer, glReadPixels GLREADBUFFER(3G)
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