80 lines
2.2 KiB
Plaintext
80 lines
2.2 KiB
Plaintext
!!ARBvp1.0
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# Compute the surface space light vectors for diffuse bump mapping
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# as well as a fog factor for an atmospheric haze effect.
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ATTRIB iPos = vertex.position;
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ATTRIB iNormal = vertex.normal;
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ATTRIB iTangent = vertex.attrib[6];
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ATTRIB iTex0 = vertex.texcoord[0];
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ATTRIB iTex1 = vertex.texcoord[1];
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PARAM mvp[4] = { state.matrix.mvp };
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PARAM eyePos = program.env[1];
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PARAM lightDir = program.env[0];
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PARAM haze = program.env[6];
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PARAM half = 0.5;
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PARAM zero = 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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OUTPUT oTex1 = result.texcoord[1];
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OUTPUT oFog = result.fogcoord;
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TEMP binormal;
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TEMP t;
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TEMP light_surf;
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TEMP diffuseFactor;
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TEMP eyeVec;
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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 diffuse light component
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DP3 diffuseFactor, iNormal, lightDir;
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# Clamp the diffuse component to zero
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MAX diffuseFactor, diffuseFactor, zero;
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# Get the vector from the eye to the vertex
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SUB eyeVec, eyePos, iPos;
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# Normalize it
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DP3 eyeVec.w, eyeVec, eyeVec;
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RSQ eyeVec.w, eyeVec.w;
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MUL eyeVec, eyeVec, eyeVec.w;
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# Output the fog factor
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DP3 diffuseFactor.y, iNormal, eyeVec;
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SUB diffuseFactor.y, one, diffuseFactor.y;
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MUL oFog.x, diffuseFactor.x, diffuseFactor.y;
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# Haze is complete; now do the bump mapping setup
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# Compute the binormal--cross product of normal and tangent
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MOV t, iTangent;
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MUL binormal, iNormal.zxyw, t.yzxw;
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MAD binormal, iNormal.yzxw, t.zxyw, -binormal;
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# Normalization should not be necessary
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#DP3 binormal.w, binormal, binormal;
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#RSQ binormal.w, binormal.w;
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#MUL binormal.xyz, binormal, binormal.w;
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# Transform the light direction from object space into surface space
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DP3 light_surf.x, iTangent, lightDir;
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DP3 light_surf.y, -binormal, lightDir;
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DP3 light_surf.z, iNormal, lightDir;
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# Compress the light direction to fit in the primary color and output it
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MAD oColor, light_surf, half, half;
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# Output the texture
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MOV oTex0, iTex0;
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MOV oTex1, iTex1;
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END
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