| | '''OpenGL extension SGI.video_sync |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GLX.SGI.video_sync to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | This extension provides a means for synchronization with the video |
| | frame rate of a monitor. (In the case of an interlaced monitor, |
| | this is typically the rate of displaying both the even and odd |
| | fields of a frame.) The kernel maintains a video sync counter for |
| | each physical hardware pipe in a system; the counter is incremented |
| | upon the completion of the display of each full frame of video data. An |
| | OpenGL context always corresponds to a pipe. When an OpenGL process |
| | has a current context, it can put itself to sleep until the counter of |
| | that pipe reaches a desired value. The process can also query the |
| | value of the counter. |
| | |
| | The counter runs as long as the graphics subsystem is running; it is |
| | initialized via the /usr/gfx/gfxinit command. However, a process can |
| | query or sleep on the counter only when a direct context is current. |
| | Each of the procedures described below will fail and return an error |
| | code if the current context is not a direct one. |
| | |
| | The counter is an unsigned 32-bit integer. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/SGI/video_sync.txt |
| | ''' |
| | from OpenGL import platform, constant, arrays |
| | from OpenGL import extensions, wrapper |
| | import ctypes |
| | from OpenGL.raw.GLX import _types, _glgets |
| | from OpenGL.raw.GLX.SGI.video_sync import * |
| | from OpenGL.raw.GLX.SGI.video_sync import _EXTENSION_NAME |
| |
|
| | def glInitVideoSyncSGI(): |
| | '''Return boolean indicating whether this extension is available''' |
| | from OpenGL import extensions |
| | return extensions.hasGLExtension( _EXTENSION_NAME ) |
| |
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| |
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| | |
