source: GTP/trunk/App/Demos/Illum/Ogre/Media/materials/GTPBasic/GTPBasicShading.hlsl @ 2266

struct ShadedTex_OUT
{
 float4 vPos : POSITION;
 float4 texCoord : TEXCOORD0;
 float4 wNormal : TEXCOORD1;
 float4 wPos    : TEXCOORD2;  
};
#define SAMPLECUTDIST2 0.01
float4 TexturedShadedOneLight_PS(ShadedTex_OUT IN,
                                                uniform float3 lightPos,
                                                uniform float3 lightDir,
                                                uniform float3 lightColor,                                              
                                                uniform float  lightPower,
                                                uniform sampler2D colorTex : register(s0)):COLOR0
{
        float4 color = 1;
        
        lightDir = normalize(lightDir);
        IN.wNormal.xyz = normalize(IN.wNormal.xyz);
        
        float3 diff = lightPos - IN.wPos;
        float dist2 = dot(diff, diff);
        if(dist2 < SAMPLECUTDIST2)
                dist2 = SAMPLECUTDIST2; 
        diff = normalize(diff);
        float cosa = max(dot(lightDir, -diff), 0);
        float cosb = max(dot(IN.wNormal.xyz, diff), 0);
        
        color.rgb = pow(cosa, 9) * cosb / dist2 * lightPower;
        //color.rgb *= lightPower;
        //return 0;
        return color * tex2D(colorTex, IN.texCoord);
}