From 85fb3e402744bbfd67ca9c79c98f54dd8ad169f5 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Wed, 14 Oct 2009 11:28:28 -0600
Subject: docs: document more MESA_GLSL env var options

---
 docs/envvars.html | 1 +
 docs/shading.html | 8 +++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/docs/envvars.html b/docs/envvars.html
index 6d7a321da9..b2c0e01ee3 100644
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -28,6 +28,7 @@ Setting this variable automatically sets the MESA_TEX_PROG variable as well.
 <li>MESA_EXTENSION_OVERRIDE - can be used to enable/disable extensions.
 A value such as "GL_EXT_foo -GL_EXT_bar" will enable the GL_EXT_foo extension
 and disable the GL_EXT_bar extension.
+<li>MESA_GLSL - <a href="shading.html#envvars">shading language options</a>
 </ul>
 
 <p>
diff --git a/docs/shading.html b/docs/shading.html
index 77c86be3aa..96060f1a75 100644
--- a/docs/shading.html
+++ b/docs/shading.html
@@ -39,7 +39,8 @@ Contents
 
 <p>
 The <b>MESA_GLSL</b> environment variable can be set to a comma-separated
-list of keywords to control some aspects of the GLSL compiler:
+list of keywords to control some aspects of the GLSL compiler and shader
+execution.  These are generally used for debugging.
 </p>
 <ul>
 <li>dump - print GLSL shader code to stdout at link time
@@ -49,6 +50,11 @@ list of keywords to control some aspects of the GLSL compiler:
 <li>nopt - disable compiler optimizations
 <li>opt - force compiler optimizations
 <li>uniform - print message to stdout when glUniform is called
+<li>nopvert - force vertex shaders to be a simple shader that just transforms
+    the vertex position with ftransform() and passes through the color and
+    texcoord[0] attributes.
+<li>nopfrag - force fragment shader to be a simple shader that passes
+    through the color attribute.
 </ul>
 <p>
 Example:  export MESA_GLSL=dump,nopt
-- 
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