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- <title>Shading Language Support</title>
+ <title>Shading Language</title>
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<div class="header">
- <h1>The Mesa 3D Graphics Library</h1>
+ The Mesa 3D Graphics Library
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-<h1>Shading Language Support</h1>
+<h1>Shading Language</h1>
<p>
This page describes the features and status of Mesa's support for the
<li><b>nopfrag</b> - force fragment shader to be a simple shader that passes
through the color attribute.
<li><b>useprog</b> - log glUseProgram calls to stderr
+<li><b>errors</b> - GLSL compilation and link errors will be reported to stderr.
</ul>
<p>
Example: export MESA_GLSL=dump,nopt
</p>
+<h3 id="replacement">Experimenting with Shader Replacements</h3>
<p>
-Shaders can be dumped and replaced on runtime for debugging purposes. Mesa
-needs to be configured with '--with-sha1' to enable this functionality. This
+Shaders can be dumped and replaced on runtime for debugging purposes. This
feature is not currently supported by SCons build.
This is controlled via following environment variables:
+</p>
<ul>
<li><b>MESA_SHADER_DUMP_PATH</b> - path where shader sources are dumped
<li><b>MESA_SHADER_READ_PATH</b> - path where replacement shaders are read
</ul>
Note, path set must exist before running for dumping or replacing to work.
When both are set, these paths should be different so the dumped shaders do
-not clobber the replacement shaders.
+not clobber the replacement shaders. Also, the filenames of the replacement shaders
+should match the filenames of the corresponding dumped shaders.
+
+<h3 id="capture">Capturing Shaders</h3>
+
+<p>
+Setting <b>MESA_SHADER_CAPTURE_PATH</b> to a directory will cause the compiler
+to write <code>.shader_test</code> files for use with
+<a href="https://gitlab.freedesktop.org/mesa/shader-db">shader-db</a>, a tool
+which compiler developers can use to gather statistics about shaders
+(instructions, cycles, memory accesses, and so on).
+</p>
+<p>
+Notably, this captures linked GLSL shaders - with all stages together -
+as well as ARB programs.
</p>
<h2 id="support">GLSL Version</h2>
projects / mesa.git / blobdiff