4. Uniforms

Uniforms are the same for all vertces

Queried by glGetUniformLocation()

Set by glUniform*()

Apply to both vertices and fragments

Denoted by the uniform type modifier

The value of uniform is constant in the shader code

Uniforms are usefull to pass:

• Matrices, e. g. Model-View-Perspective

• Light positions

#version 130

in vec4 vPosition;
in vec4 vNormal;

uniform mat4 mM;
uniform mat4 mV;
uniform mat4 mP;
uniform mat4 mRotations;

uniform vec4 vLight;

void main () {
    
    /*rotate normals...*/
    /*if rotating camera, rotate light
      direction as well...*/
    
    // Go model to world, then to camera,
    //then to NDC coordinates:
    gl_Position = mP * mV * mM * vPosition;
}