| '''OpenGL extension APPLE.sync |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GLES2.APPLE.sync to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| This extension introduces the concept of "sync objects". Sync |
| objects are a synchronization primitive - a representation of events |
| whose completion status can be tested or waited upon. One specific |
| type of sync object, the "fence sync object", is supported in this |
| extension, and additional types can easily be added in the future. |
| |
| Fence sync objects have corresponding fences, which are inserted |
| into the OpenGL command stream at the time the sync object is |
| created. A sync object can be queried for a given condition. The |
| only condition supported for fence sync objects is completion of the |
| corresponding fence command. Fence completion allows applications to |
| request a partial Finish, wherein all commands prior to the fence |
| will be forced to complete before control is returned to the calling |
| process. |
| |
| These new mechanisms allow for synchronization between the host CPU |
| and the GPU, which may be accessing the same resources (typically |
| memory), as well as between multiple GL contexts bound to multiple |
| threads in the host CPU. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/APPLE/sync.txt |
| ''' |
| from OpenGL import platform, constant, arrays |
| from OpenGL import extensions, wrapper |
| import ctypes |
| from OpenGL.raw.GLES2 import _types, _glgets |
| from OpenGL.raw.GLES2.APPLE.sync import * |
| from OpenGL.raw.GLES2.APPLE.sync import _EXTENSION_NAME |
|
|
| def glInitSyncAPPLE(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
| |
| glGetSyncivAPPLE=wrapper.wrapper(glGetSyncivAPPLE).setInputArraySize( |
| 'values', None |
| ) |
| |
