| Name |
| |
| EXT_context_priority |
| |
| Name Strings |
| |
| GLX_EXT_context_priority |
| |
| Contributors |
| |
| Adam Jackson, Red Hat |
| |
| Cloned from EGL_IMG_context_priority, whose contributors included: |
| |
| Ben Bowman, Imagination Techonologies |
| Graham Connor, Imagination Techonologies |
| |
| Contacts |
| |
| Adam Jackson <ajax@redhat.com> |
| |
| Status |
| |
| Complete |
| |
| Version |
| |
| Version 2, 10 April 2019 |
| |
| Number |
| |
| OpenGL Extension #535 |
| |
| Dependencies |
| |
| Requires GLX_ARB_create_context. |
| |
| This extension is written against the text of the GLX 1.4 specification. |
| |
| Overview |
| |
| This extension allows a GLXContext to be created with a priority |
| hint. It is possible that an implementation will not honour the |
| hint, especially if there are constraints on the number of high |
| priority contexts available in the system, or system policy limits |
| access to high priority contexts to appropriate system privilege |
| level. A query is provided to find the real priority level assigned |
| to the context after creation. |
| |
| New Types |
| |
| None |
| |
| New Procedures and Functions |
| |
| None |
| |
| New Tokens |
| |
| New attributes accepted by the <attrib_list> argument of |
| glXCreateContextAttribsARB: |
| |
| GLX_CONTEXT_PRIORITY_LEVEL_EXT 0x3100 |
| |
| New attribute values accepted in the <attrib_list> argument |
| of glXCreateContextAttribsARB: |
| |
| GLX_CONTEXT_PRIORITY_HIGH_EXT 0x3101 |
| GLX_CONTEXT_PRIORITY_MEDIUM_EXT 0x3102 |
| GLX_CONTEXT_PRIORITY_LOW_EXT 0x3103 |
| |
| Additions to the GLX_ARB_create_context specification |
| |
| Add to the text of attributes supported by glXCreateContextAttribsARB: |
| |
| "GLX_CONTEXT_PRIORITY_LEVEL_EXT determines the priority level of |
| the context to be created. This attribute is a hint, as an |
| implementation may not support multiple contexts at some |
| priority levels and system policy may limit access to high |
| priority contexts to appropriate system privilege level. The |
| default value for GLX_CONTEXT_PRIORITY_LEVEL_EXT is |
| GLX_CONTEXT_PRIORITY_MEDIUM_EXT." |
| |
| Additions to the GLX 1.4 specification |
| |
| To Table 3.5 "Context attributes" add the row: |
| |
| Attribute Type Description |
| GLX_CONTEXT_PRIORITY_LEVEL_EXT int Context priority level |
| |
| Issues |
| |
| Refer to the issues in EGL_IMG_context_priority for further background. |
| |
| 1) What enumerant values should we use here? |
| |
| RESOLVED: Reuse the enums from EGL_IMG_context_priority. The window |
| system binding APIs have trended towards sharing enumerant space. The |
| range is not otherwise assigned for GLX, and Imagination have consented |
| to its reuse in GLX. |
| |
| Revision History |
| |
| Version 2, 10 April 2019 (Adam Jackson) |
| - Resolve enumerant issue. |
| |
| Version 1, 20 February 2019 (Adam Jackson) |
| - Clone from EGL_IMG_context_priority |