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