Commit c4341fe8 authored by Brian Paul's avatar Brian Paul

mesa: updated GLSL docs

parent ec8cdc71
......@@ -15,23 +15,46 @@ OpenGL Shading Language</a>.
</p>
<p>
Last updated on 28 March 2007.
Last updated on 15 December 2008.
</p>
<p>
Contents
</p>
<ul>
<li><a href="#120">GLSL 1.20 support</a>
<li><a href="#unsup">Unsupported Features</a>
<li><a href="#notes">Implementation Notes</a>
<li><a href="#hints">Programming Hints</a>
<li><a href="#standalone">Stand-alone GLSL Compiler</a>
<li><a href="#implementation">Compiler Implementation</a>
<li><a href="#validation">Compiler Validation</a>
<li><a href="#120">GLSL 1.20 support</a>
</ul>
<a name="120">
<h2>GLSL 1.20 support</h2>
<p>
GLSL version 1.20 is supported in Mesa 7.3.
Among the features/differences of GLSL 1.20 are:
<ul>
<li><code>mat2x3, mat2x4</code>, etc. types and functions
<li><code>transpose(), outerProduct(), matrixCompMult()</code> functions
(but untested)
<li>precision qualifiers (lowp, mediump, highp)
<li><code>invariant</code> qualifier
<li><code>array.length()</code> method
<li><code>float[5] a;</code> array syntax
<li><code>centroid</code> qualifier
<li>unsized array constructors
<li>initializers for uniforms
<li>const initializers calling built-in functions
</ul>
<a name="unsup">
<h2>Unsupported Features</h2>
......@@ -41,15 +64,10 @@ in Mesa:
</p>
<ul>
<li>Dereferencing arrays with non-constant indexes
<li>Comparison of user-defined structs
<li>Linking of multiple shaders is not supported
<li>gl_ClipVertex
<li>The derivative functions such as dFdx() are not implemented
<li>The inverse trig functions asin(), acos(), and atan() are not implemented
<li>The gl_Color and gl_SecondaryColor varying vars are interpolated
without perspective correction
<li>Floating point literal suffixes 'f' and 'F' aren't allowed.
</ul>
<p>
......@@ -304,11 +322,11 @@ Extra NOP instructions will also be inserted.
<h2>Compiler Validation</h2>
<p>
A new <a href="http://glean.sf.net" target="_parent">Glean</a> test has
A <a href="http://glean.sf.net" target="_parent">Glean</a> test has
been create to exercise the GLSL compiler.
</p>
<p>
The <em>glsl1</em> test runs over 150 sub-tests to check that the language
The <em>glsl1</em> test runs over 170 sub-tests to check that the language
features and built-in functions work properly.
This test should be run frequently while working on the compiler to catch
regressions.
......@@ -319,39 +337,5 @@ should be added.
</p>
<a name="120">
<h2>GLSL 1.20 support</h2>
<p>
Support for GLSL version 1.20 is underway. Status as follows.
</p>
<h3>Supported</h3>
<ul>
<li><code>mat2x3, mat2x4</code>, etc. types and functions
<li><code>transpose(), outerProduct(), matrixCompMult()</code> functions
(but untested)
<li>precision qualifiers (lowp, mediump, highp)
</ul>
<h3>Partially Complete</h3>
<ul>
<li><code>invariant</code> qualifier
</ul>
<h3>Not Completed</h3>
<ul>
<li><code>array.length()</code> method
<li><code>float[5] a;</code> array syntax
<li><code>centroid</code> qualifier
<li>unsized array constructors
<li>initializers for uniforms
<li>const initializers calling built-in functions
</ul>
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