GLSL Essentials

Examples

In the following pages I'm going to present some examples, from the most basic one to a complex lighting shader.

Solid color mesh

The first one is a very simple shader that writes the mesh in a solid color, received using a uniform variable:

#version 430
#debug(on)
#optimize(off)
uniform vec4 SolidColor;
out vec4 FBColor;

void main()
{
  FBColor= SolidColor;
}

Using a half red color stored in the SolidColor uniform variable, over a cylinder mesh, we get the following rendering:

Using only uniforms as input we can't do much more than this, so I'll colorize the cylinder using its own vertices' positions.

Interpolated colored mesh

First, in the vertex ...