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    <p>If you mean to run several shaders in a single render pass, like so (example pulled from thin air):</p> <ol> <li>Vertex color</li> <li>Texture</li> <li>Lighting</li> <li>Shadow</li> </ol> <p>...each stage attached to a single <code>WebGLProgram</code> object, and each stage with its own <code>main()</code> function, then no, GLSL doesn't work this way.</p> <p>GLSL works more like C/C++, where you have a single global <code>main()</code> function that acts as your program's entry point, and any arbitrary number of libraries attached to it. The four examples above could each be a separate "library," compiled on its own but linked together into a single program, and invoked by a single <code>main()</code> function, but they may not each define their own <code>main()</code> function, because such definitions in GLSL are shared across the entire program.</p> <p>This unfortunately requires you to write separate <code>main()</code> functions (at a minimum) for every shader you intend to use, which leads to a <em>lot</em> of redundant programming, even if you plan to reuse the libraries themselves. That's why I ended up writing a glorified string mangler to manage my GLSL libraries for <a href="http://blog.jaxgl.com/what-is-jax" rel="nofollow">Jax</a>; I'm not sure how useful the code will be outside of my framework, but you are certainly free to take a look at it, and make use of anything you find helpful. The relevant files are:</p> <ul> <li><a href="https://github.com/sinisterchipmunk/jax/blob/b64d3c92bc2da27898e448f1ad38d683ed0b5e82/lib/assets/javascripts/jax/shader.js.coffee" rel="nofollow">lib/assets/javascripts/jax/shader.js.coffee</a></li> <li><a href="https://github.com/sinisterchipmunk/jax/blob/b64d3c92bc2da27898e448f1ad38d683ed0b5e82/lib/assets/javascripts/jax/shader/program.js.coffee" rel="nofollow">lib/assets/javascripts/jax/shader/program.js.coffee</a></li> <li><a href="https://github.com/sinisterchipmunk/jax/blob/b64d3c92bc2da27898e448f1ad38d683ed0b5e82/spec/javascripts/jax/shader_spec.js.coffee" rel="nofollow">spec/javascripts/jax/shader_spec.js.coffee</a> (tests and usage examples)</li> <li><a href="https://github.com/sinisterchipmunk/jax/blob/b64d3c92bc2da27898e448f1ad38d683ed0b5e82/spec/javascripts/jax/shader/program_spec.js.coffee" rel="nofollow">spec/javascripts/jax/shader/program_spec.js.coffee</a> (more tests and usage examples)</li> </ul> <p>Good luck!</p>
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    1. POWeb-GL : Mulitple Fragment Shaders per Program
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