source: code/branches/tutorial/Tutorial/Media/materials/programs/OffsetMappingFp.glsl @ 25

uniform vec4 lightDiffuse;
uniform vec4 scaleBias;
uniform vec4 spotParams;
uniform vec4 lightDiffuse1;
uniform vec4 spotParams1;

uniform sampler2D normalHeightMap;
uniform sampler2D diffuseMap;
uniform sampler2D shadowMap1;
uniform sampler2D shadowMap2;



varying vec3 tangentEyeDir;
varying vec3 tangentLightDir[2];
varying vec3 tangentSpotDir[2];
varying vec4 shadowUV[2];


// Expand a range-compressed vector
vec3 expand(vec3 v)
{
        return (v - 0.5) * 2.0;
}


void main()
{
        // get the height using the tex coords
        float height = texture2D(normalHeightMap, gl_TexCoord[0].xy).a;
        // scale and bias factors       
        float scale = scaleBias.x;
        float bias = scaleBias.y;

        // calculate displacement       
        float displacement = (height * scale) + bias;
        //float displacement = (height * 0.04) - 0.02;
        
        vec3 scaledEyeDir = tangentEyeDir * displacement;
        
        // calculate the new tex coord to use for normal and diffuse
        vec2 newTexCoord = (scaledEyeDir + gl_TexCoord[0].xyz).xy;
        
        // get the new normal and diffuse values
        vec3 normal = expand(texture2D(normalHeightMap, newTexCoord).xyz);
        vec4 diffuse = texture2D(diffuseMap, newTexCoord);
        
        vec4 col1 = diffuse * clamp(dot(normal, tangentLightDir[0]),0.0,1.0) * lightDiffuse;
        // factor in spotlight angle
        float rho = clamp(dot(tangentSpotDir[0], tangentLightDir[0]),0.0,1.0);
        // factor = (rho - cos(outer/2) / cos(inner/2) - cos(outer/2)) ^ falloff
        float spotFactor = pow(
                clamp(rho - spotParams.y,0.0,1.0) / (spotParams.x - spotParams.y), spotParams.z);
        col1 = col1 * spotFactor;
        vec4 col2 = diffuse * clamp(dot(normal, tangentLightDir[1]),0.0,1.0) * lightDiffuse1;
        // factor in spotlight angle
        rho = clamp(dot(tangentSpotDir[1], tangentLightDir[1]),0.0,1.0);
        // factor = (rho - cos(outer/2) / cos(inner/2) - cos(outer/2)) ^ falloff
        spotFactor = pow(
                clamp(rho - spotParams1.y,0.0,1.0) / (spotParams1.x - spotParams1.y), spotParams1.z);
        col2 = col2 * spotFactor;

        // shadow textures
        col1 = col1 * texture2DProj(shadowMap1, shadowUV[0]);
        col2 = col2 * texture2DProj(shadowMap2, shadowUV[1]);

        gl_FragColor = col1 + col2;

}