/*******************************************************************************
 *
 * Simple GLSL FX file
 *
 *******************************************************************************/

#pragma language GLSL

// un-tweakables

// structures and shaders /////////////////////

varying vec3 eyeNormal;

void mainVS()
{ 
	//	Must write gl_Position for rasterization to be defined....
	//
	gl_Position = ftransform();

	//	Transform to shading space (we are going to shade in eyespace)
	//
	eyeNormal = gl_NormalMatrix * gl_Normal;
}



// fragment settings
uniform vec3	diffuse = vec3(1.0,1.0,0.0);
uniform float	shininess = 16;
uniform float	steps = 6;
const vec3	white = vec3(1.0);

void mainPS()
{
  vec3	normal;
  vec4	MyColor;
  vec4	tex; 
  vec3	color;
  float turb;
  float illum;
  float s0,t0;
  vec3	lightDirection=vec3(1.0,1.0,1.0);
  
  lightDirection = normalize(lightDirection);
  
  vec4 Intensity;
  
  //
  //	Since the EyeNormal is getting interpolated, we
  //	have to first restore it by normalizing it.
  //
  normal = normalize( eyeNormal );

  //compute a half vector, assuming infinite viewer
  vec3 hlf = normalize( lightDirection + vec3(0.0,0.0,1.0));

  //compute the diffuse illumination
  illum = clamp( dot(normal, lightDirection), 0.0, 1.0);

  //add diffuse color and specular
  color = clamp( diffuse*(illum+0.2) + pow( max(dot(hlf,normal),0.0), 16.0), 0.0, 1.0);
  
  //apply a step function
  color = floor(color*steps) /steps;
  
  gl_FragColor = vec4( color, 1.0);
}



//////// techniques ////////////////////////////

technique Toon0
{
	pass p0
	{
		VertexShader = compile vs_2_0 mainVS();
		
		ZEnable = true;
		ZWriteEnable = true;
		ZFunc = Less;
		CullMode = None;
		//FillMode = Point;
		//PointSize = 32.0;
		//DepthBias = 200.0;

		PixelShader = compile ps_2_0 mainPS();
	}
}