47 lines
1.4 KiB
Text
47 lines
1.4 KiB
Text
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/**
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* Geforce 4 diffuse bumpmapping program
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* This compiles under the fp20 profile.
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* compile with "-profile fp20"
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*/
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struct inputVertex {
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float4 lightVec : COLOR0;
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float4 texCoord0 : TEXCOORD0;
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float4 texCoord1 : TEXCOORD1;
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float4 texCoord2 : TEXCOORD2;
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float4 texCoord3 : TEXCOORD3;
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};
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float4 main(inputVertex I, uniform sampler2D colorMap, uniform sampler2D normalMap, uniform samplerCUBE filter, uniform sampler3D atten) : COLOR
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{
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//normalize light vector (talyor series around 1)
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float3 lightVector = 2 * (I.lightVec.xyz - 0.5);
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float3 normLight = 1-(lightVector-1)/2;
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// Get the normal from normal map lookup
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float4 normal = 2 * (tex2D(normalMap, I.texCoord1.xy) - 0.5);
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// Lookup the colorMap texture
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float4 texColor = tex2D(colorMap, I.texCoord0.xy);
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// N dot L
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float4 dot_result = saturate(dot(normLight, normal.xyz).xxxx);
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//selfshadow term, ok we just do a mul with 8 but the compiler doesn't recognize that
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//so we teach it a bit of math :)
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float selfShadow = (lightVector.z*4)+(lightVector.z*4);
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//Lookup the attenuation factor
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float4 attenv = tex3D(atten, I.texCoord2.xyz);
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//Lookup the filter color
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float3 filterv = texCUBE(filter, I.texCoord3.xyz).xyz;
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// Modulate color with N dot L
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float4 res;
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res.xyz = dot_result.xyz * texColor.xyz * attenv.xyz * filterv.xyz * selfShadow * attenv.xyz * texColor.xyz;
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res.w = attenv.w * selfShadow;
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return res;
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}
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