ARB_shader_clock Lands For Intel's Mesa Driver
Written by Michael Larabel in Mesa on 31 October 2015 at 10:16 AM EDT. 1 Comment
MESA --
Over a few commits yesterday, the Intel Mesa driver now exposes ARB_shader_clock support.

The Mesa i965 DRI driver enables ARB_shader_clock support for Intel Ivy Bridge "Gen 7" graphics and newer. This work will be part of Mesa 11.1.

GL_ARB_shader_clock is a new OpenGL extension as of this year. ARB_shader_clock is part of the Khronos "2015" OpenGL extensions unveiled in August that aren't currently advertised as part of a new, post-4.5 version of the OpenGL specification.

ARB_shader_clock is a free-running "clock" that can allow shaders to monitor the performance and has other use-cases too. The OpenGL.org registry explains, "This extension exposes a 64-bit monotonically incrementing shader counter which may be used to derive local timing information within a single shader invocation."
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