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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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// So c[0].z = 1, but all other c[i].z = 0
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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, r0, c4; // c4 = (0.5, 0.5, 0.5, 1)
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add r0, r0, c4;
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//mov r0, c4;
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