forked from KolibriOS/kolibrios
130 lines
3.2 KiB
Python
130 lines
3.2 KiB
Python
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.
|