Commit e9cf458f authored by Kenneth Graunke's avatar Kenneth Graunke

docs: Document shader capturing environment variables.

Reviewed-by: Tapani Pälli's avatarTapani Pälli <>
parent 85b66d20
......@@ -133,6 +133,8 @@ that variable is set), or else within .cache/mesa within the user's
home directory.
<li>MESA_GLSL - <a href="shading.html#envvars">shading language compiler options</a>
<li>MESA_NO_MINMAX_CACHE - when set, the minmax index cache is globally disabled.
<li>MESA_SHADER_CAPTURE_PATH - see <a href="shading.html#capture">Capturing Shaders</a></li>
<li>MESA_SHADER_DUMP_PATH and MESA_SHADER_READ_PATH - see <a href="shading.html#replacement">Experimenting with Shader Replacements</a></li>
......@@ -64,6 +64,7 @@ execution. These are generally used for debugging.
Example: export MESA_GLSL=dump,nopt
<h3 id="replacement">Experimenting with Shader Replacements</h3>
Shaders can be dumped and replaced on runtime for debugging purposes. This
feature is not currently supported by SCons build.
......@@ -79,6 +80,20 @@ not clobber the replacement shaders. Also, the filenames of the replacement shad
should match the filenames of the corresponding dumped shaders.
<h3 id="capture">Capturing Shaders</h3>
Setting <b>MESA_SHADER_CAPTURE_PATH</b> to a directory will cause the compiler
to write <tt>.shader_test</tt> files for use with
<a href="">shader-db</a>, a tool
which compiler developers can use to gather statistics about shaders
(instructions, cycles, memory accesses, and so on).
Notably, this captures linked GLSL shaders - with all stages together -
as well as ARB programs.
<h2 id="support">GLSL Version</h2>
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