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Is there someplace I can read about the changes and additions made in GLSL from version 1.1 to 1.2 and from 1.2 to 1.3?
Google seem to be at a loss for this and I really don't want to start reading the complete specification.
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Yes, gl_FragColor is deprecated. You should use the following syntax: layout(location = 0) out vec4 diffuseColor; It is included in the GLSL 4.60 spec under the section 7.1.
The OpenGL Shading Language (GLSL) is the principal shading language for OpenGL. While, thanks to OpenGL Extensions, there are several shading languages available for use in OpenGL, GLSL (and SPIR-V) are supported directly by OpenGL without extensions. GLSL is a C-style language.
One way to speed up GLSL code, is by marking some variables constant at compile-time. This way the compiler may optimize code (e.g. unroll loops) and remove unused code (e.g. if hard shadows are disabled). The drawback is that changing these constant variables requires that the GLSL code is compiled again.
Version 1.3 of the spec has differences from 1.2 marked, it also lists changes from 1.2. Version 1.2 has a list of changes from 1.1.
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