Open GL Vertex and Fragment Shaders

Recap: Vertex and fragment shaders are a programmable replacement for steps 2 and 6 of the fixed function pipeline.

Shaders have input registers and output registers (excerpt):

Vertex shader:

• in: MVP, vertex position, attributes
• out: transformed vertex position, varying attributes

Fragment shader:

• in: rasterized fragment position, rasterized varying attributes
• out: final color