GLDRAWBUFFER - Online Linux Manual PageSection : 3G
NAME"glDrawBuffer − specify which color buffers are to be drawn into
C SPECIFICATIONvoid glDrawBuffer( GLenum mode )
PARAMETERSmode  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.
DESCRIPTIONWhen 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. .BP ­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 buffers, 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 initialization.
NOTESIt is always the case that ­GL_AUXi = ­GL_AUX0 + i.
ERRORS­GL_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 GETS­glGet with argument ­GL_DRAW_BUFFER
­glGet with argument ­GL_AUX_BUFFERS
SEE ALSO­glBlendFunc(3G), ­glColorMask(3G), ­glIndexMask(3G), ­glLogicOp(3G), ­glReadBuffer(3G) 0
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