50 lines
1.4 KiB
Plaintext
50 lines
1.4 KiB
Plaintext
!!ARBvp1.0
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# Night texture lighting
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ATTRIB iPos = vertex.position;
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ATTRIB iNormal = vertex.normal;
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ATTRIB iTex0 = vertex.texcoord[0];
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PARAM mvp[4] = { state.matrix.mvp };
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PARAM lightDir0 = program.env[0];
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PARAM diffuse = program.env[2];
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PARAM lightDir1 = program.env[18];
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PARAM zeroVec = { 0, 0, 0, 0 };
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PARAM one = 1;
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OUTPUT oPos = result.position;
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OUTPUT oColor = result.color;
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OUTPUT oTex0 = result.texcoord[0];
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TEMP diffuseFactor;
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TEMP diffuseSum;
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# Transform the vertex by the modelview matrix
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DP4 oPos.x, mvp[0], iPos;
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DP4 oPos.y, mvp[1], iPos;
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DP4 oPos.z, mvp[2], iPos;
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DP4 oPos.w, mvp[3], iPos;
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# Compute the illumination from the first light source
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DP3 diffuseFactor, iNormal, lightDir0;
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MAX diffuseFactor, diffuseFactor, zeroVec;
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MOV diffuseSum, diffuseFactor;
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# Compute the illumination from the second light source
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DP3 diffuseFactor, iNormal, lightDir1;
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MAX diffuseFactor, diffuseFactor, zeroVec;
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ADD diffuseSum, diffuseSum, diffuseFactor;
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# Use the fourth power of L dot N to create a sharper division between
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# the lit and unlit sides of the planet.
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ADD diffuseSum, one, -diffuseSum;
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MUL diffuseSum, diffuseSum, diffuseSum;
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MAD diffuseSum, diffuseSum, -diffuseSum, one;
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# Output the texture
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MOV oTex0, iTex0;
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# Output the primary color
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MUL oColor, diffuse, diffuseSum;
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END
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