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35 lines
743 B
35 lines
743 B
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// Composite the cosines together. |
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// Input map is cosine(pix) for each of |
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// the 4 waves. |
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// |
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// The constants are set up so: |
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// Nx = -freq * amp * dirX * cos(pix); |
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// Ny = -freq * amp * dirY * cos(pix); |
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// So c[i].x = -freq[i] * amp[i] * dirX[i] |
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// etc. |
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// All textures are: |
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// (r,g,b,a) = (cos(), cos(), 1, 1) |
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// |
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// Here all c[i].z = 0, because we're accumulating ontop |
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// of layers that have been primed with z = 1. |
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// Note also the c4 used for biasing back at the end. |
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ps.1.1 |
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tex t0; |
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tex t1; |
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tex t2; |
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tex t3; |
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mul r0, t0_bx2, c0; |
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mad r0, t1_bx2, c1, r0; |
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mad r0, t2_bx2, c2, r0; |
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mad r0, t3_bx2, c3, r0; |
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// Now bias it back into range [0..1] for output. |
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mul r0.rgb, r0, c4; |
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+mov r0.a, c4; |
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add r0.rgb, r0, c5; |
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//mov r0, c4;
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