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// Composite the cosines together.
// Input map is cosine(pix) for each of
// the 4 waves.
//
// The constants are set up so:
// Nx = -freq * amp * dirX * cos(pix);
// Ny = -freq * amp * dirY * cos(pix);
// So c[i].x = -freq[i] * amp[i] * dirX[i]
// etc.
// All textures are:
// (r,g,b,a) = (cos(), cos(), 1, 1)
//
// So c[0].z = 1, but all other c[i].z = 0
// Note also the c4 used for biasing back at the end.
ps.1.1
tex t0;
tex t1;
tex t2;
tex t3;
mul r0, t0_bx2, c0;
mad r0, t1_bx2, c1, r0;
mad r0, t2_bx2, c2, r0;
mad r0, t3_bx2, c3, r0;
// Now bias it back into range [0..1] for output.
mul r0, r0, c4; // c4 = (0.5, 0.5, 0.5, 1)
add r0, r0, c4;
//mov r0, c4;