override protected void _fragmentShader()
{
var textureRGB = (IRegister)assign(TEMP[0], "textureRGB");
var lightNormal = (IField)assign(TEMP[1].xyz, "lightNormal");
var keyValue = (IComponent)assign(TEMP[2].x, "keyValue");
var attenuation = (IComponent)assign(TEMP[2].y, "attenuation");
var pixelToLight = (IField)assign(TEMP[3].xyz, "pixelToLight");
var finalLight = (IRegister)assign(TEMP[4], "finalLight");
var finalColor = (IRegister)assign(TEMP[5], "finalColor");
var lightColor = (IField)CONST[0].rgb;
var lightStrenth = (IComponent)CONST[0].w;
var ambient = (IField)CONST[1].rgb;
var zero = (IComponent)CONST[2].x;
var third = (IComponent)CONST[2].y;
var one = (IComponent)CONST[2].z;
var half = (IComponent)CONST[2].w;
// Use UV coordinates passed from vertex shader to sample the texture
sampleTexture(textureRGB, vertexUV, SAMPLER[0], new[] { TextureFlag.TYPE_2D, TextureFlag.MODE_CLAMP, TextureFlag.FILTER_LINEAR });
// Calculate the key value - hilight on surfaces that directly face the light source
normalize(lightNormal, lightPos.xyz);
dotProduct3(keyValue, vertexNormal, lightNormal);
add(keyValue, keyValue, third);
multiply(keyValue, keyValue, lightStrenth);
max(keyValue, keyValue, zero);
// Attenuated diffuse light - the closer to the light a surface is, the stronger this value
subtract(pixelToLight, vertexPos.xyz, lightPos.xyz);
dotProduct3(attenuation, pixelToLight, pixelToLight);
squareRoot(attenuation, attenuation);
subtract(attenuation, attenuation, lightStrenth);
subtract(attenuation, attenuation, lightStrenth);
subtract(attenuation, attenuation, lightStrenth);
max(attenuation, attenuation, zero);
reciprocal(attenuation, attenuation);
multiply(attenuation, attenuation, attenuation);
// Blend the key and attenuation values with the light color
add(finalLight, keyValue, attenuation);
multiply(finalLight, finalLight, lightColor);
add(finalLight, finalLight, ambient);
// Finally, blend with the texture sample and output (Try using any of the following blends)
Blend.hardLight(finalColor, textureRGB, finalLight, one, half, TEMP[1], TEMP[2], TEMP[3]);
//Blend.softLight(finalColor, finalLight, textureRGB);
//Blend.pinLight(finalColor, textureRGB, finalLight, one, half, TEMP[1], TEMP[2], TEMP[3]);
//Blend.glow(finalColor, finalLight, textureRGB, one, TEMP[1]);
//Blend.grainMerge(finalColor, textureRGB, finalLight, half);
//Blend.linearLight(finalColor, textureRGB, finalLight, one);
move(OUTPUT, finalColor.rgb);
}