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authormarha <marha@users.sourceforge.net>2013-06-04 09:07:26 +0200
committermarha <marha@users.sourceforge.net>2013-06-04 09:07:26 +0200
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-Name
-
- MESA_swap_control
-
-Name Strings
-
- GLX_MESA_swap_control
-
-Contact
-
- Ian Romanick, IBM, idr at us.ibm.com
-
-Status
-
- Deployed in DRI drivers post-XFree86 4.3.
-
-Version
-
- Date: 5/1/2003 Revision: 1.1
-
-Number
-
- ???
-
-Dependencies
-
- None
-
- Based on GLX_SGI_swap_control version 1.9 and WGL_EXT_swap_control
- version 1.5.
-
-Overview
-
- This extension allows an application to specify a minimum periodicity
- of color buffer swaps, measured in video frame periods.
-
-Issues
-
- * Should implementations that export GLX_MESA_swap_control also export
- GL_EXT_swap_control for compatibility with WGL_EXT_swap_control?
-
- UNRESOLVED.
-
-New Procedures and Functions
-
- int glXSwapIntervalMESA(unsigned int interval)
- int glXGetSwapIntervalMESA(void)
-
-New Tokens
-
- None
-
-Additions to Chapter 2 of the 1.4 GL Specification (OpenGL Operation)
-
- None
-
-Additions to Chapter 3 of the 1.4 GL Specification (Rasterization)
-
- None
-
-Additions to Chapter 4 of the 1.4 GL Specification (Per-Fragment Operations
-and the Framebuffer)
-
- None
-
-Additions to Chapter 5 of the 1.4 GL Specification (Special Functions)
-
- None
-
-Additions to Chapter 6 of the 1.4 GL Specification (State and State Requests)
-
- None
-
-Additions to the GLX 1.3 Specification
-
- [Add the following to Section 3.3.10 of the GLX Specification (Double
- Buffering)]
-
- glXSwapIntervalMESA specifies the minimum number of video frame periods
- per buffer swap. (e.g. a value of two means that the color buffers
- will be swapped at most every other video frame.) A return value
- of zero indicates success; otherwise an error occurred. The interval
- takes effect when glXSwapBuffers is first called subsequent to the
- glXSwapIntervalMESA call.
-
- A video frame period is the time required by the monitor to display a
- full frame of video data. In the case of an interlaced monitor,
- this is typically the time required to display both the even and odd
- fields of a frame of video data.
-
- If <interval> is set to a value of 0, buffer swaps are not synchro-
- nized to a video frame. The <interval> value is silently clamped to
- the maximum implementation-dependent value supported before being
- stored.
-
- The swap interval is not part of the render context state. It cannot
- be pushed or popped. The current swap interval for the window
- associated with the current context can be obtained by calling
- glXGetSwapIntervalMESA. The default swap interval is 0.
-
- On XFree86, setting the environment variable LIBGL_THROTTLE_REFRESH sets
- the swap interval to 1.
-
-Errors
-
- glXSwapIntervalMESA returns GLX_BAD_CONTEXT if there is no current
- GLXContext or if the current context is not a direct rendering context.
-
-GLX Protocol
-
- None. This extension only extends to direct rendering contexts.
-
-New State
-
- Get Value Get Command Type Initial Value
- --------- ----------- ---- -------------
- [swap interval] GetSwapInterval Z+ 0
-
-New Implementation Dependent State
-
- None
-
-
-Revision History
-
- 1.1, 5/1/03 Added the issues section and contact information.
- Changed the default swap interval to 0.
- 1.0, 3/17/03 Initial version based on GLX_SGI_swap_control and
- WGL_EXT_swap_control.