Shaders

Question 1

What does a Vertex Shader do?

Answer 1

A Vertex Shader

is run on every vertex

processes the vertex

and determines where the vertex should be on the screen

This information is eventually passed on to the Fragment Shader for this vertex

Question 2

What does a Fragment Shader do?

Answer 2

It must decide how to colour an object that has vertices

Question 3

What are Uniforms?

Answer 3

These are variables sent to the Vertex and Fragment Shaders

They stay constant throughout the frame, though can be changed during the frame

Question 4

What are Attributes?

Answer 4

Values applied to individual vertices

Only available to Vertex Shader

Question 5

What are Varyings?

Answer 5

Variables that are declared in the Vertex Shader and are shared with the Fragment Shader.

This is a simple way of passing data between the shaders