RGBA Color

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Fragment shaders use RGBA color for describing color: each pixel has a Red, Green, Blue and Alpha (opacity) value which when combined can represent any visible colour.

In GLSL colours are represented as vectors:

For example:

GLSL vectors are a special type of array where each of the 2–4 values is a number. Vectors in GLSL are first-class citizens, and using them correctly is key to making the most of GLSL's potential. More on that later...