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NAME

       glDrawBuffer, glNamedFramebufferDrawBuffer - specify which color buffers are to be drawn
       into

C SPECIFICATION

       void glDrawBuffer(GLenum buf);

       void glNamedFramebufferDrawBuffer(GLuint framebuffer, GLenum buf);

PARAMETERS

       framebuffer
           Specifies the name of the framebuffer object for glNamedFramebufferDrawBuffer
           function. Must be zero or the name of a framebuffer object.

       buf
           For default framebuffer, the argument 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, and GL_FRONT_AND_BACK are
           accepted. The initial value is GL_FRONT for single-buffered contexts, and GL_BACK for
           double-buffered contexts. For framebuffer objects, GL_COLOR_ATTACHMENT$m$ and GL_NONE
           enums are accepted, where $m$ is a value between 0 and GL_MAX_COLOR_ATTACHMENTS.

DESCRIPTION

       When colors are written to the frame buffer, they are written into the color buffers
       specified by glDrawBuffer. One of the following values can be used for default
       framebuffer:

       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 buffers,
           only the front left color buffer 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.

       For framebuffer objects, GL_COLOR_ATTACHMENT$m$ and GL_NONE enums are accepted, where $m$
       is a value between 0 and GL_MAX_COLOR_ATTACHMENTS. glDrawBuffer will set the draw buffer
       for fragment colors other than zero to GL_NONE.

ERRORS

       GL_INVALID_OPERATION error is generated by glNamedFramebufferDrawBuffer if framebuffer is
       not zero or the name of an existing framebuffer object.

       GL_INVALID_ENUM is generated if buf is not an accepted value.

       GL_INVALID_OPERATION is generated if the default framebuffer is affected and none of the
       buffers indicated by buf exists.

       GL_INVALID_OPERATION is generated if a framebuffer object is affected and buf is not equal
       to GL_NONE or GL_COLOR_ATTACHMENT$m$, where $m$ is a value between 0 and
       GL_MAX_COLOR_ATTACHMENTS.

ASSOCIATED GETS

       glGet() with argument GL_DRAW_BUFFER

VERSION SUPPORT

       ┌─────────────────────────────┬───────────────────────────────────────────────────────────────────────┐
       │                             │                OpenGL Version                                         │
       ├─────────────────────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
       │Function2.02.13.03.13.23.34.04.14.24.34.44.5 │
       │/                            │     │     │     │     │     │     │     │     │     │     │     │     │
       │Feature                      │     │     │     │     │     │     │     │     │     │     │     │     │
       │Name                         │     │     │     │     │     │     │     │     │     │     │     │     │
       ├─────────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │glDrawBuffer                 │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │
       ├─────────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │glNamedFramebufferDrawBuffer │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  ✔  │
       └─────────────────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘

SEE ALSO

       glBlendFunc(), glColorMask(), glDrawBuffers(), glLogicOp(), glReadBuffer()

COPYRIGHT

       Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This
       document is licensed under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

COPYRIGHT

       Copyright © 1991-2006 Silicon Graphics, Inc.
       Copyright © 2010-2014 Khronos Group

[FIXME: source]                             01/03/2018                           GLDRAWBUFFER(3G)