swap_control
Specification
Name
SGI_swap_control
Name Strings
GLX_SGI_swap_control
Version
$Date: 1996/09/09 00:59:50 $ $Revision: 1.2 $
Number
40
Dependencies
None
Overview
This extension allows an application to specify a minimum periodicity
of color buffer swaps, measured in video frame periods.
New Procedures and Functions
int glXSwapIntervalSGI(int interval)
New Tokens
None
Additions to Chapter 2 of the 1.0 Specification (OpenGL Operation)
None
Additions to Chapter 3 of the 1.0 Specification (Rasterization)
None
Additions to Chapter 4 of the 1.0 Specification (Per-Fragment Operations and
the Framebuffer)
None
Additions to Chapter 5 of the 1.0 Specification (Special Functions)
None
Additions to Chapter 6 of the 1.0 Specification (State and State Requests)
None
Additions to the GLX Specification
[Add the following to Section 3.2.6 of the GLX Specification (Double
Buffering)]
glXSwapIntervalSGI 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
glXSwapIntervalSGI 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.
Errors
glXSwapIntervalSGI returns GLX_BAD_VALUE if parameter < interval > is
less than or equal to zero.
glXSwapIntervalSGI returns GLX_BAD_CONTEXT if there is no current
GLXContext.
New State
None
Get Value Get Command Type Initial Value
--------- ----------- ---- -------------
[swap interval] [none] Z+
New Implementation Dependent State
None