MESA_framebuffer_flip_x

GL_MESA_framebuffer_flip_x

Cici Ruan <ruanc@chromium.org>

Cici Ruan, Google
Kristian Kristensen‎, Google
Fritz Koenig, Google
Rob Clark, Google
Chad Versace, Google

Proposal

Last Modified Date: April 8, 2020
Revision: 1

OpenGL Extension 548
OpenGL ES Extension 327

Requires OpenGL ES 3.1 or OpenGL 4.3 for FramebufferParameteri.

This extension defines a new framebuffer parameter,
GL_FRAMEBUFFER_FLIP_X_MESA, that changes the behavior of the reads and
writes to the framebuffer attachment points. When
GL_FRAMEBUFFER_FLIP_X_MESA is GL_TRUE, render commands and pixel transfer
operations access the backing store of each attachment point with an
x-inverted coordinate system. This x-inversion is relative to the
coordinate system set when GL_FRAMEBUFFER_FLIP_X_MESA is GL_FALSE.

Access through TexSubImage2D and similar calls will notice the effect of
the flip when they are not attached to framebuffer objects because
GL_FRAMEBUFFER_FLIP_X_MESA is associated with the framebuffer object and
not the attachment points.

This extension is mainly for pre-rotation and recommended to use it with
MESA_framebuffer_flip_y and MESA_framebuffer_swap_xy to have rotated
result.

None

None

None

None

Accepted by the <pname> argument of FramebufferParameteri and
GetFramebufferParameteriv:

    GL_FRAMEBUFFER_FLIP_X_MESA                      0x8BBC

Interactions with OpenGL ES 3.1 and any other versions and
extensions that provide the entry points FramebufferParameteri
and GetFramebufferParameteriv

None

Version 1, 2020/04/08
  - Initial draft (Cici Ruan)