| 58 | // --------------------------------------------------------------------------- |
| 59 | |
| 60 | void FlowFieldFloat::Perlin2D::init(u32 seed) { |
| 61 | u8 p[256]; |
| 62 | for (int i = 0; i < 256; i++) |
| 63 | p[i] = (u8)i; |
| 64 | u32 s = seed; |
| 65 | for (int i = 255; i > 0; i--) { |
| 66 | s = s * 1664525u + 1013904223u; |
| 67 | int j = (int)((s >> 16) % (u32)(i + 1)); |
| 68 | u8 tmp = p[i]; |
| 69 | p[i] = p[j]; |
| 70 | p[j] = tmp; |
| 71 | } |
| 72 | for (int i = 0; i < 256; i++) { |
| 73 | perm[i] = p[i]; |
| 74 | perm[i + 256] = p[i]; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | float FlowFieldFloat::Perlin2D::noise(float x, float y) const { |
| 79 | int xi = ((int)floorf(x)) & 255; |
no outgoing calls
no test coverage detected