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+Name
+
+   ANGLE_sync_control_rate
+
+Name Strings
+
+   EGL_ANGLE_sync_control_rate
+
+Contact
+
+   Jonah Ryan-Davis, Google (jonahr 'at' google.com)
+
+Status
+
+   Draft.
+
+Version
+
+   Version 1, 2020-03-24
+
+   Based on GLX_OML_sync_control Revision 6.0
+   Related to EGL_CHROMIUM_sync_control Revision 2.0
+
+Number
+
+   142
+
+Dependencies
+
+   The extension is written against the EGL 1.2 Specification, although it
+   should work on other versions of these specifications.
+
+Overview
+
+   This extension provides counters which let applications know about the
+   timing of the last vertical retrace. By looking at the system clock, as
+   well as the refresh rate of the monitor, this should enable applications
+   to predict the position of future retraces so as to schedule an optimal
+   workload.
+
+   This extension incorporates the use of a counter that provides the
+   necessary synchronization. The graphics Media Stream Counter (or
+   graphics MSC) is a counter that is unique to the graphics subsystem
+   and increments for each vertical retrace that occurs. 
+
+   By querying the MSC rate for a given surface, the application can
+   accurately predict the timing for the next vertical retraces and schedule
+   rendering accordingly.
+
+Issues
+
+   None.
+
+IP Status
+
+   No known issues.
+
+New Procedures and Functions
+
+   Bool eglGetMscRateANGLE(EGLDisplay* dpy,
+                           EGLSurface surface,
+                           int32_t* numerator,
+                           int32_t* denominator)
+
+New Tokens
+
+   None
+
+Additions to the EGL 1.3 Specification
+
+   The graphics MSC value is incremented once for each screen refresh.
+   For a non-interlaced display, this means that the graphics MSC value
+   is incremented for each frame. For an interlaced display, it means
+   that it will be incremented for each field. For a multi-monitor
+   system, the monitor used to determine MSC is the one where the surface
+   is located. If the surface spans multiple monitors, the monitor used
+   to determine MSC is the one with the biggest coverage in pixels.
+
+   eglGetMscRateANGLE returns the rate at which the MSC will be incremented
+   for the display associated with <dpy> and <surface>. The rate is expressed
+   in Hertz as <numerator> / <denominator>. If the MSC rate in Hertz is an
+   integer, then <denominator> will be 1 and <numerator> will be
+   the MSC rate.
+
+Errors
+
+   The function eglGetMscRateANGLE returns FALSE on failure.
+   If <dpy> is not a valid EGLDisplay, EGL_BAD_DISPLAY is generated.
+   If <surface> is not a valid EGLSurface, EGL_BAD_SURFACE is generated.
+   If there is no current EGLContext, EGL_BAD_CONTEXT is generated.
+
+New Implementation Dependent State
+
+   None
+
+Revision History
+
+    Version 1, 2020-03-24 (Jonah Ryan-Davis)
+       - Initial draft, based on GLX_OML_sync_control revision 6.0.