#version 330 core

// Input vertex data, different for all executions of this shader.
layout(location = 0) in vec3 position_modelspace;
layout(location = 1) in vec3 normal_modelspace;

uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;

out vec3 normal_worldspace;

void main(){

	//transform normal into worldspace
	normal_worldspace = normalize(vec3(model * vec4(normal_modelspace,0.0)));

    //transform vertex position into screenspace
	vec4 v = vec4(position_modelspace,1);
	vec4 position_worldspace = model * v;
    gl_Position = projection * view * position_worldspace;
}

----------------------------
#version 330 core

in vec3 normal_worldspace;

// Ouput data
out vec3 color;

void main()
{
	float intensity;
	vec3 lightDir;
	vec3 normal;

	lightDir = normalize(vec3(1.0,0.0,1.0));
	normal = normalize(normal_worldspace);
	intensity = max(dot(lightDir,normal),0.0);
	// Output color = red
	color = (vec3(0.5f,0.5f,0.5f) * intensity) + vec3(0.2f,0.2f,0.2f) ;
}