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glDrawBuffer

Chapter 4

117

glDrawBuffer

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

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