Our Triangle Fragment Shader

We’ve been shading our triangle in a yellow color
- shading is the fancy term for processing something
- in this case, it’s color
For fragment shaders, we need to define our own output variable
- there’s no gl_Position equivalent
- below, we define fColor as our output variable
- we use the f prefix to indicate that it’s a fragment-shader output
  - totally arbitrary choice

out vec4 fColor;

void main() {
    fColor = vec4(1.0, 1.0, 0.0, 1.0);
}