VERTEX

#version 400

layout(location = 0) in vec3 position;
layout(location = 2) in vec3 normal;

out vec3 pass_colour;

uniform mat4 transformationMatrix;
uniform mat4 projectionMatrix;
uniform mat4 viewMatrix;

uniform vec3 lightPosition;
uniform vec3 lightColour;

void main(void){

    vec4 worldPosition = transformationMatrix * vec4(position, 1.0);
    gl_Position = projectionMatrix * viewMatrix * worldPosition;

	vec3 surfaceNormal = normalize(normal);
	vec3 lightVector = -normalize(lightPosition - worldPosition.xyz);
	float brightness = max(dot(lightVector, surfaceNormal), 0.2);
	vec3 diffuse = brightness * lightColour;
	vec3 lighting = (lightColour * 0.5) + (diffuse * 0.9);

	vec3 colour = vec3(-0.6, 0.5, 0.5);

	pass_colour = colour * lighting;

}

FRAGMENT

#version 400

in vec3 pass_colour;

out vec4 out_Colour;


void main(void) {
    	out_Colour = vec4(pass_colour, 1.0f);

}