59 lines
1.5 KiB
Plaintext
59 lines
1.5 KiB
Plaintext
!!VP1.0
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# c[0]..c[3] contains the concatenation of the modelview and projection matrices.
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# c[4]..c[7] contains the inverse transpose of the modelview
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# c[15] contains the eye position in object space
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# c[16] contains the light direction in object space
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# c[17] contains H, the normalized sum of the eye and light direction
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# c[20] contains the light color * object color
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# c[32] contains the ambient light color * object color
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# c[33] contains the haze color
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# c[40] contains (0, 1, 0, specPower)
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# v[OPOS] contains the per-vertex position
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# v[NRML] contains the per-vertex normal
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# v[TEX0] contains the per-vertex texture coordinate 0
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# o[HPOS] output register for homogeneous position
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# o[TEX0] output register for texture coordinate 0
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# o[COL0] output register for primary color
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# R0...R11 temporary registers
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# Transform the vertex by the modelview matrix
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DP4 R1.x, c[0], v[OPOS];
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DP4 R1.y, c[1], v[OPOS];
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DP4 R1.z, c[2], v[OPOS];
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DP4 R1.w, c[3], v[OPOS];
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# Compute the diffuse light component
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DP3 R2, v[NRML], c[16];
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# Clamp the diffuse component to zero
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MAX R2.x, R2, c[40].xxxx;
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# Get the vector from the eye to the vertex
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ADD R4, c[15], -v[OPOS];
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# Normalize it
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DP3 R0.w, R4, R4;
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RSQ R0.w, R0.w;
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MUL R4.xyz, R4, R0.w;
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# Haze
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DP3 R2.y, v[NRML], R4;
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ADD R2.y, c[40].y, -R2.y;
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# MUL R2.y, R2.x, R2.y;
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MUL o[FOGC].x, R2.x, R2.y;
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# Output the texture
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MOV o[TEX0], v[TEX0];
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# Output the primary color
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MOV R0, c[32];
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MAD o[COL0], c[20], R2.xxxx, R0;
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# MUL o[COL1], R2.y, c[33];
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# Output the vertex
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MOV o[HPOS], R1;
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END
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