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--- a/nx-X11/extras/Mesa/docs/MESA_swap_control.spec
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@@ -1,132 +0,0 @@
-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(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 synchron-
-    ized 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_VALUE if parameter <interval> is
-    less than zero.
-
-    glXSwapIntervalMESA returns GLX_BAD_CONTEXT if there is no current
-    GLXContext.
-
-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.