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Is this a per device sort of thing? Or is it based on the browser? Sorry for such a basic question but I cant seem to find a straight answer.
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WebGL 1.0 only supports GLSL 1.0. 17. (Remember that WebGL is based on OpenGL ES 2.0, which was designed for computing devices with low power and limited processing.)
WebGL is based on the OpenGL ES 2.0 specification, and retains the semantics of OpenGL ES in order to maximize portability to mobile devices. There are some significant differences in behavior of similar APIs between OpenGL ES 2.0 and the OpenGL API on desktop systems.
You pick the GLSL version for the version of OpenGL that is your minimum supported version. If your minimum supported GL version is 2.1, then your GLSL version should be 1.10. If your minimum supported version is GL 4.1, then your GLSL version should be 4.10.
First: Test to see if WebGL is the problem To find out if WebGL is causing the problem, open a browser window and head to http://get.webgl.org. If you DO NOT see a spinning cube, you can try a couple things depending on your browser before contacting our support team.
It is based on OpenGL ES 2.0, and according to the spec, it must support GLSL ES version 1.00. In fact that is all it supports.
On another note, this has been my general reference for GLSL features: http://www.shaderific.com/glsl/
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