OpenGL extension EXT.timer_query
This module customises the behaviour of the
OpenGL.raw.GL.EXT.timer_query to provide a more
Overview (from the spec)
Applications can benefit from accurate timing information in a number of
different ways. During application development, timing information can
help identify application or driver bottlenecks. At run time,
applications can use timing information to dynamically adjust the amount
of detail in a scene to achieve constant frame rates. OpenGL
implementations have historically provided little to no useful timing
information. Applications can get some idea of timing by reading timers
on the CPU, but these timers are not synchronized with the graphics
rendering pipeline. Reading a CPU timer does not guarantee the completion
of a potentially large amount of graphics work accumulated before the
timer is read, and will thus produce wildly inaccurate results.
glFinish() can be used to determine when previous rendering commands have
been completed, but will idle the graphics pipeline and adversely affect
This extension provides a query mechanism that can be used to determine
the amount of time it takes to fully complete a set of GL commands, and
without stalling the rendering pipeline. It uses the query object
mechanisms first introduced in the occlusion query extension, which allow
time intervals to be polled asynchronously by the application.
The official definition of this extension is available here:
|EXTENSION_NAME = 'GL_EXT_timer_query'|
GL_TIME_ELAPSED_EXT = GL_TIME_ELAPSED_EXT
__file__ = '/home/mcfletch/pylive/OpenGL/GL/EXT/timer_query.pyc'
__name__ = 'OpenGL.GL.EXT.timer_query'
__package__ = 'OpenGL.GL.EXT'
glGetQueryObjecti64vEXT = <OpenGL.platform.baseplatform.glGetQueryObjecti64vEXT object at 0x77a3b50>
glGetQueryObjectui64vEXT = <OpenGL.platform.baseplatform.glGetQueryObjectui64vEXT object at 0x77a3410>