Name MESA_framebuffer_flip_y Name Strings GL_MESA_framebuffer_flip_y Contact Fritz Koenig Contributors Fritz Koenig, Google Kristian Høgsberg, Google Chad Versace, Google Heinrich Fink, DAQRI Status Proposal Version Version 3, August, 2019 Number OpenGL Extension #540 OpenGL ES Extension #302 Dependencies Requires OpenGL ES 3.0, OpenGL 4.3, or ARB_framebuffer_no_attachments. Overview This extension defines a new framebuffer parameter, GL_FRAMEBUFFER_FLIP_Y_MESA, that changes the behavior of the reads and writes to the framebuffer attachment points. When GL_FRAMEBUFFER_FLIP_Y_MESA is GL_TRUE, render commands and pixel transfer operations access the backing store of each attachment point with an y-inverted coordinate system. This y-inversion is relative to the coordinate system set when GL_FRAMEBUFFER_FLIP_Y_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_Y_MESA is associated with the framebuffer object and not the attachment points. IP Status None Issues None New Procedures and Functions OpenGL ES must provide the following functions: void FramebufferParameteriMESA(enum target, enum pname, int param); void GetFramebufferParameterivMESA(enum target, enum pname, int *params); New Types None New Tokens Accepted by the argument of FramebufferParameteriMESA and GetFramebufferParameterivMESA: GL_FRAMEBUFFER_FLIP_Y_MESA 0x8BBB Interactions with OpenGL 4.3, OpenGL ES 3.1, ARB_framebuffer_no_attachments and any other versions and extensions that provide the entry points FramebufferParameteri and GetFramebufferParameteriv Token GL_FRAMEBUFFER_FLIP_Y_MESA is accepted as the argument of FramebufferParameteri and GetFramebufferParameteriv. Errors An INVALID_OPERATION error is generated by GetFramebufferParameteriv or GetFramebufferParameterivMESA if the default framebuffer is bound to and is GL_FRAMEBUFFER_FLIP_Y_MESA. Revision History Version 3, August, 2019 Allow OpenGL ES 3.0 to implement by adding functions FramebufferParameteriMESA and GetFramebufferParameterivMESA which were previously only available in OpenGL ES 3.1. Version 2, June, 2019 Enable extension for OpenGL 4.3 and beyond Version 1, June, 2018 Initial draft (Fritz Koenig)