diff options
Diffstat (limited to 'source/blender/freestyle/intern/system/RandGen.cpp')
| -rw-r--r-- | source/blender/freestyle/intern/system/RandGen.cpp | 132 |
1 files changed, 67 insertions, 65 deletions
diff --git a/source/blender/freestyle/intern/system/RandGen.cpp b/source/blender/freestyle/intern/system/RandGen.cpp index 49a9df14f22..77eb9a8c10a 100644 --- a/source/blender/freestyle/intern/system/RandGen.cpp +++ b/source/blender/freestyle/intern/system/RandGen.cpp @@ -28,69 +28,70 @@ namespace Freestyle { // /////////////////////////////////////////////////////////////////////////////// -#define N 16 -#define MASK ((unsigned)(1 << (N - 1)) + (1 << (N - 1)) - 1) -#define X0 0x330E -#define X1 0xABCD -#define X2 0x1234 -#define A0 0xE66D -#define A1 0xDEEC -#define A2 0x5 -#define C 0xB +#define N 16 +#define MASK ((unsigned)(1 << (N - 1)) + (1 << (N - 1)) - 1) +#define X0 0x330E +#define X1 0xABCD +#define X2 0x1234 +#define A0 0xE66D +#define A1 0xDEEC +#define A2 0x5 +#define C 0xB #if 0 // XXX Unused -#define HI_BIT (1L << (2 * N - 1)) +# define HI_BIT (1L << (2 * N - 1)) #endif -#define LOW(x) ((unsigned)(x) & MASK) +#define LOW(x) ((unsigned)(x)&MASK) #define HIGH(x) LOW((x) >> N) -#define MUL(x, y, z) \ - { \ - long l = (long)(x) * (long)(y); \ - (z)[0] = LOW(l); \ - (z)[1] = HIGH(l); \ - } +#define MUL(x, y, z) \ + { \ + long l = (long)(x) * (long)(y); \ + (z)[0] = LOW(l); \ + (z)[1] = HIGH(l); \ + } -#define CARRY(x, y) ((unsigned long)((long)(x) + (long)(y)) > MASK) -#define ADDEQU(x, y, z) (z = CARRY(x, (y)), x = LOW(x + (y))) +#define CARRY(x, y) ((unsigned long)((long)(x) + (long)(y)) > MASK) +#define ADDEQU(x, y, z) (z = CARRY(x, (y)), x = LOW(x + (y))) #define SET3(x, x0, x1, x2) ((x)[0] = (x0), (x)[1] = (x1), (x)[2] = (x2)) -#if 0 // XXX, unused -#define SETLOW(x, y, n) SET3(x, LOW((y)[n]), LOW((y)[(n)+1]), LOW((y)[(n)+2])) +#if 0 // XXX, unused +# define SETLOW(x, y, n) SET3(x, LOW((y)[n]), LOW((y)[(n) + 1]), LOW((y)[(n) + 2])) #endif -#define SEED(x0, x1, x2) (SET3(x, x0, x1, x2), SET3(a, A0, A1, A2), c = C) - -#if 0 // XXX, unused -#define REST(v) \ - for (i = 0; i < 3; i++) { \ - xsubi[i] = x[i]; \ - x[i] = temp[i]; \ - } \ - return (v); \ - (void) 0 - -#define NEST(TYPE, f, F) \ - TYPE f(register unsigned short *xsubi) { \ - register int i; \ - register TYPE v; \ - unsigned temp[3]; \ - for (i = 0; i < 3; i++) { \ - temp[i] = x[i]; \ - x[i] = LOW(xsubi[i]); \ - } \ - v = F(); \ - REST(v); \ - } +#define SEED(x0, x1, x2) (SET3(x, x0, x1, x2), SET3(a, A0, A1, A2), c = C) + +#if 0 // XXX, unused +# define REST(v) \ + for (i = 0; i < 3; i++) { \ + xsubi[i] = x[i]; \ + x[i] = temp[i]; \ + } \ + return (v); \ + (void)0 + +# define NEST(TYPE, f, F) \ + TYPE f(register unsigned short *xsubi) \ + { \ + register int i; \ + register TYPE v; \ + unsigned temp[3]; \ + for (i = 0; i < 3; i++) { \ + temp[i] = x[i]; \ + x[i] = LOW(xsubi[i]); \ + } \ + v = F(); \ + REST(v); \ + } #endif static unsigned x[3] = { - X0, - X1, - X2, + X0, + X1, + X2, }; static unsigned a[3] = { - A0, - A1, - A2, + A0, + A1, + A2, }; static unsigned c = C; @@ -101,29 +102,30 @@ static unsigned c = C; real RandGen::drand48() { - static real two16m = 1.0 / (1L << N); - next(); - return (two16m * (two16m * (two16m * x[0] + x[1]) + x[2])); + static real two16m = 1.0 / (1L << N); + next(); + return (two16m * (two16m * (two16m * x[0] + x[1]) + x[2])); } void RandGen::srand48(long seedval) { - SEED(X0, LOW(seedval), HIGH(seedval)); + SEED(X0, LOW(seedval), HIGH(seedval)); } void RandGen::next() { - unsigned p[2], q[2], r[2], carry0, carry1; - - MUL(a[0], x[0], p); - ADDEQU(p[0], c, carry0); - ADDEQU(p[1], carry0, carry1); - MUL(a[0], x[1], q); - ADDEQU(p[1], q[0], carry0); - MUL(a[1], x[0], r); - x[2] = LOW(carry0 + carry1 + CARRY(p[1], r[0]) + q[1] + r[1] + a[0] * x[2] + a[1] * x[1] + a[2] * x[0]); - x[1] = LOW(p[1] + r[0]); - x[0] = LOW(p[0]); + unsigned p[2], q[2], r[2], carry0, carry1; + + MUL(a[0], x[0], p); + ADDEQU(p[0], c, carry0); + ADDEQU(p[1], carry0, carry1); + MUL(a[0], x[1], q); + ADDEQU(p[1], q[0], carry0); + MUL(a[1], x[0], r); + x[2] = LOW(carry0 + carry1 + CARRY(p[1], r[0]) + q[1] + r[1] + a[0] * x[2] + a[1] * x[1] + + a[2] * x[0]); + x[1] = LOW(p[1] + r[0]); + x[0] = LOW(p[0]); } } /* namespace Freestyle */ |