docs: add sha256 checksums for 18.0.4

[mesa.git] / docs / shading.html

diff --git a/docs/shading.html b/docs/shading.html
index c789102e64139b8d866c9dc5302e398e63f038ac..a0bbe997c1b8eeea572fa16260b4af329689cb9c 100644 (file)
--- a/docs/shading.html
+++ b/docs/shading.html
@@ -64,9 +64,9 @@ execution.  These are generally used for debugging.
 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:
@@ -76,7 +76,22 @@ This is controlled via following environment variables:
 </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.
+</p>
+
+<h3 id="capture">Capturing Shaders</h3>
+
+<p>
+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="https://cgit.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>