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authorTapani Pälli <[email protected]>2015-08-31 09:54:23 +0300
committerTapani Pälli <[email protected]>2015-09-04 08:22:37 +0300
commit04e201d0c02cd30ace5c6fe80e9f021ebb733682 (patch)
treeffaa13fa4de05dc7fa01c09bdae21e816dff1ea1 /docs
parent0db323a62481a57269a46287a64fa743756e80f3 (diff)
mesa: change 'SHADER_SUBST' facility to work with env variables
Patch modifies existing shader source and replace functionality to work with environment variables rather than enable dumping on compile time. Also instead of _mesa_str_checksum, _mesa_sha1_compute is used to avoid collisions. Functionality is controlled via two environment variables: MESA_SHADER_DUMP_PATH - path where shader sources are dumped MESA_SHADER_READ_PATH - path where replacement shaders are read v2: cleanups, add strerror if fopen fails, put all functionality inside HAVE_SHA1 since sha1 is required Signed-off-by: Tapani Pälli <[email protected]> Suggested-by: Eero Tamminen <[email protected]> Reviewed-by: Brian Paul <[email protected]>
Diffstat (limited to 'docs')
-rw-r--r--docs/shading.html14
1 files changed, 14 insertions, 0 deletions
diff --git a/docs/shading.html b/docs/shading.html
index 77a0ee413d9..e9fe3dde166 100644
--- a/docs/shading.html
+++ b/docs/shading.html
@@ -63,6 +63,20 @@ execution. These are generally used for debugging.
Example: export MESA_GLSL=dump,nopt
</p>
+<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
+feature is not currently supported by SCons build.
+
+This is controlled via following environment variables:
+<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.
+</p>
<h2 id="support">GLSL Version</h2>