The Language
When you start coding a shader, you have to keep in mind one important thing: which GLSL version you are going to code for. This is usually a minimum requirements decision for your application. GLSL version is always bound to a specific OpenGL version, so in order to choose a GLSL version that supports the features we need, we are also tied to the minimum OpenGL version that supports that GLSL version.
At the moment of writing this book, I had to decide which version of GLSL to use. As we will talk about the compute shaders, we need to go to the minimum version that support them in a native way (not through extensions), and that's GLSL Version 4.30.6.
The official GLSL specification could be a good reference resource, once you have finished reading this book. You will be able to find the full list of functions in the tables located in the specification. The 4.30.6 GLSL specification can be downloaded directly from the OpenGL official site: https://www.opengl.org/registry/doc/GLSLangSpec...
