////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////
// simple toon vertex shader from www.lighthouse3d.com

// normal and lightDir will be sent to the fragment shader
varying vec3 normal, lightDir;

void main()
{	
    // gl_LightSource[0].position - uniform vector provided by GLSL

    // the light position is already stored in eye space coordinates
    lightDir = normalize(vec3(gl_LightSource[0].position));
	
    // convert normal to eye space coordinates using gl_NormalMatrix
    // gl_NormalMatrix is built in uniform matrix provided by GLSL
    // representing the inverse transpose model-view matrix
    normal = normalize(gl_NormalMatrix * gl_Normal);
		
    // leave the position of the vertices alone	
    gl_Position = ftransform();
	
	
	// uncomment these lines to see a flattened teapot
	/*
    vec4 p;

    p.xyzw = gl_Vertex.xyzw; // gl_Vertex - attribute provided by GLSL
    p.y = 0.1 * gl_Vertex.y;

    // gl_ModelViewProjectionMatrix - uniform matrix provided by GLSL
    gl_Position = gl_ModelViewProjectionMatrix * p;
    */
    
}