GLDRAWBUFFER(3G) UNIX Programmer's Manual GLDRAWBUFFER(3G)
glDrawBuffer - specify which color buffers are to be drawn
into
void glDrawBuffer( GLenum mode )
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.
When colors are written to the frame buffer, they are writ-
ten 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 writ-
ten.
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GLDRAWBUFFER(3G) UNIX Programmer's Manual GLDRAWBUFFER(3G)
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 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 dif-
ferent results in each buffer.
Monoscopic contexts include only left buffers, and stereos-
copic contexts include both left and right buffers. Like-
wise, single-buffered contexts include only front buffers,
and double-buffered contexts include both front and back
buffers. The context is selected at GL initialization.
It is always the case that GL_AUXi = GL_AUX0 + i.
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 exe-
cuted between the execution of glBegin and the corresponding
execution of glEnd.
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GLDRAWBUFFER(3G) UNIX Programmer's Manual GLDRAWBUFFER(3G)
glGet with argument GL_DRAW_BUFFER
glGet with argument GL_AUX_BUFFERS
glBlendFunc(3G), glColorMask(3G), glIndexMask(3G),
glLogicOp(3G), glReadBuffer(3G)
MirOS BSD #10-current Printed 20.2.2012 3
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