GLREADBUFFER - Online Linux Manual Page

Section : 3G
Updated : 01/20/2022
Source : [FIXME: source]
Note : [FIXME: manual]

NAME

glReadBuffer, glNamedFramebufferReadBuffer − select a color buffer source for pixels

C SPECIFICATION

void glReadBuffer(GLenum

mode

);

void glNamedFramebufferReadBuffer(GLuint

framebuffer

, GLenum

mode

);

PARAMETERS

framebuffer

Specifies the name of the framebuffer object for glNamedFramebufferReadBuffer

function.

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 the constants

GL_COLOR_ATTACHMENT

i

.

DESCRIPTION

glReadBuffer

specifies a color buffer as the source for subsequent

glReadPixels

(

),

glCopyTexImage1D

(

),

glCopyTexImage2D

(

),

glCopyTexSubImage1D

(

),

glCopyTexSubImage2D

(

), and

glCopyTexSubImage3D

(

) commands.

mode

accepts one of twelve or more predefined values. 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. Further more, the constants

GL_COLOR_ATTACHMENT

i

may be used to indicate the

i

th color attachment where

i

ranges from zero to the value of

GL_MAX_COLOR_ATTACHMENTS

minus one.

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.

For glReadBuffer

, the target framebuffer object is that bound to

GL_READ_FRAMEBUFFER

. For

glNamedFramebufferReadBuffer

,

framebuffer

must either be zero or the name of the target framebuffer object. If

framebuffer

is zero, then the default read framebuffer is affected.

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 by

glNamedFramebufferReadBuffer

if

framebuffer

is not zero or the name of an existing framebuffer object.

ASSOCIATED GETS

glGet

(

) with argument

GL_READ_BUFFER

VERSION SUPPORT

	OpenGL Version
Function / Feature Name	2.0	2.1	3.0	3.1	3.2	3.3	4.0	4.1	4.2	4.3	4.4	4.5
glNamedFramebufferReadBuffer	−	−	−	−	−	−	−	−	−	−	−	✔
glReadBuffer	✔	✔	✔	✔	✔	✔	✔	✔	✔	✔	✔	✔

SEE ALSO

glCopyTexImage1D

(

),

glCopyTexImage2D

(

),

glCopyTexSubImage1D

(

),

glCopyTexSubImage2D

(

),

glCopyTexSubImage3D

(

),

glDrawBuffer

(

),

glReadPixels

(

)

COPYRIGHT

Copyright © 1991−2006 Silicon Graphics, Inc. Copyright © 2011−2014 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 © 2011-2014 Khronos Group

0

Data Size : 19,672 byte

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