GLSL

• semicolons are required
• distinction between float and integer numbers
• float numbers must contain a . (eg. 1.0, .5, 5.)
• no implicit conversion between float and int
• built-in vector/matrix arithmetics

Data Types

• primitives (bool, int, float, double)
• vectors (vec2, vec3, vec4)
• matrices (mat2, mat3, mat4)
• texture data (sampler2D)

Variable types

• attribute – vertex data from WebGL buffers, only accessible in the vertex shader.
• uniform – like global variables you pass in from the JavaScript side before executing the program
• varying – passing attributes from the vertex shader to the fragment shader and interpolate in between coordinates