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| author | Brian Paul <brianp@vmware.com> | 2009-04-07 11:09:53 -0600 |
|---|---|---|
| committer | Brian Paul <brianp@vmware.com> | 2009-04-07 11:09:53 -0600 |
| commit | 439909a87d50723c2dba0ee1539467f1f4bf8bf0 (patch) | |
| tree | 79441e08cf5bd4bb66c39a2127b82ead4d2a8f33 /docs/shading.html | |
| parent | 4069447f73b3ee011a4beccc6ffa80cce84fd285 (diff) | |
docs: document the MESA_GLSL env var, other misc GLSL updates
Diffstat (limited to 'docs/shading.html')
| -rw-r--r-- | docs/shading.html | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/docs/shading.html b/docs/shading.html index b77745fbf3..77c86be3aa 100644 --- a/docs/shading.html +++ b/docs/shading.html @@ -22,6 +22,7 @@ Last updated on 15 December 2008. Contents </p> <ul> +<li><a href="#envvars">Environment variables</a> <li><a href="#120">GLSL 1.20 support</a> <li><a href="#unsup">Unsupported Features</a> <li><a href="#notes">Implementation Notes</a> @@ -33,11 +34,32 @@ Contents +<a name="envvars"> +<h2>Environment Variables</h2> + +<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: +</p> +<ul> +<li>dump - print GLSL shader code to stdout at link time +<li>log - log all GLSL shaders to files. + The filenames will be "shader_X.vert" or "shader_X.frag" where X + the shader ID. +<li>nopt - disable compiler optimizations +<li>opt - force compiler optimizations +<li>uniform - print message to stdout when glUniform is called +</ul> +<p> +Example: export MESA_GLSL=dump,nopt +</p> + + <a name="120"> <h2>GLSL 1.20 support</h2> <p> -GLSL version 1.20 is supported in Mesa 7.3. +GLSL version 1.20 is supported in Mesa 7.3 and later. Among the features/differences of GLSL 1.20 are: <ul> <li><code>mat2x3, mat2x4</code>, etc. types and functions @@ -59,12 +81,14 @@ Among the features/differences of GLSL 1.20 are: <h2>Unsupported Features</h2> <p> -The following features of the shading language are not yet supported +The following features of the shading language are not yet fully supported in Mesa: </p> <ul> -<li>Linking of multiple shaders is not supported +<li>Linking of multiple shaders does not always work. Currently, linking + is implemented through shader concatenation and re-compiling. This + doesn't always work because of some #pragma and preprocessor issues. <li>gl_ClipVertex <li>The gl_Color and gl_SecondaryColor varying vars are interpolated without perspective correction @@ -177,6 +201,8 @@ This tool is useful for: After building Mesa, the glslcompiler can be built by manually running: </p> <pre> + make realclean + make linux cd src/mesa/drivers/glslcompiler make </pre> |