//**************************************************************************/
// Copyright (c) 2008 Autodesk, Inc.
// All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk license
// agreement provided at the time of installation or download, or which
// otherwise accompanies this software in either electronic or hard copy form.
//
//**************************************************************************/
// DESCRIPTION:
// CREATED: October 2008
//**************************************************************************/
// This is C9E3v_toonShading from "The Cg Tutorial" (Addison-Wesley, ISBN
// 0321194969) by Randima Fernando and Mark J. Kilgard. See page 247.
void main(float4 position : POSITION,
float3 normal : NORMAL,
out float4 oPosition : POSITION,
out float diffuseLight : TEXCOORD0,
out float specularLight: TEXCOORD1,
out float edge : TEXCOORD2,
uniform float3 lightPosition,
uniform float3 eyePosition,
uniform float shininess,
uniform float4x4 modelViewProj)
{
oPosition = mul(modelViewProj, position);
// Calculate diffuse lighting
float3 N = normalize(normal);
float3 L = normalize(lightPosition - position.xyz);
diffuseLight = max(dot(N, L), 0);
// Calculate specular lighting
float3 V = normalize(eyePosition - position.xyz);
float3 H = normalize(L + V);
specularLight = pow(max(dot(N, H), 0), shininess);
if (diffuseLight<=0) specularLight = 0;
// Perform edge detection
edge = max(dot(N, V), 0);
}