| Name |
| |
| EXT_get_drawable_type |
| |
| Name Strings |
| |
| GLX_EXT_get_drawable_type |
| |
| Contributors |
| |
| Adam Jackson, Red Hat |
| Kyle Brenneman, NVIDIA |
| |
| Contacts |
| |
| Adam Jackson <ajax@redhat.com> |
| |
| Status |
| |
| Complete. |
| |
| Version |
| |
| Version 3, 24 September 2020 |
| |
| Number |
| |
| OpenGL Extension #552 |
| |
| Dependencies |
| |
| GLX 1.3 or higher is required. |
| |
| This extension is written against the text of the GLX 1.4 specification. |
| |
| Overview |
| |
| This extension adds to the set of drawable attributes that are sent in |
| a GLXGetDrawableAttributes request, and that can be queried with |
| glXQueryDrawable. While this is primarily a convenience for the client |
| library implementation, it may also be useful for applications. |
| |
| New Types |
| |
| None |
| |
| New Procedures and Functions |
| |
| None |
| |
| New Tokens |
| |
| New attributes accepted for the <attribute> argument of |
| glXQueryDrawable: |
| |
| GLX_DRAWABLE_TYPE 0x8010 |
| |
| Additions to the GLX 1.4 specification |
| |
| In Section 3.3.6 "Querying Attributes", add GLX_DRAWABLE_TYPE to the |
| list of legal values for the <attribute> parameter. The returned value |
| must have exactly one of GLX_{WINDOW,PIXMAP,PBUFFER}_BIT set. |
| |
| Issues |
| |
| 1) Why add GLX_DRAWABLE_TYPE? |
| |
| An X client may get the XID of a GLXDrawable from another process. When |
| this happens, the client library needs to import the drawable's state as |
| if the client had created it itself. Since different drawable types may |
| require different handling, this attribute allows the client library to |
| distinguish between windows, pixmaps, and pbuffers. |
| |
| 2) Why use GLX_*_BIT for the GLX_DRAWABLE_TYPE value? |
| |
| GLX_WINDOW and GLX_PBUFFER exist, but GLX_PIXMAP does not. |
| |
| 3) Are there other attributes we should add? |
| |
| RESOLVED. No, there aren't any other drawable (not fbconfig) attributes in |
| core GLX that aren't currently exposed, as far as we can tell. Drawable |
| attributes added by GLX extensions can be added in separate extensions. |
| |
| Revision History |
| |
| Version 3, 24 September 2020 |
| - Resolve issues, assign extension number, and mark as complete. |
| |
| Version 2, 9 September 2020 |
| - Change name to GLX_EXT_get_drawable_type. |
| |
| Version 1, 24 August 2020 |
| - Initial draft. |