blind-cross-product.c (1305B)
1 /* See LICENSE file for copyright and license details. */ 2 #ifndef TYPE 3 #include "common.h" 4 5 USAGE("right-hand-stream") 6 7 #define FILE "blind-cross-product.c" 8 #include "define-functions.h" 9 10 int 11 main(int argc, char *argv[]) 12 { 13 struct stream left, right; 14 void (*process)(struct stream *left, struct stream *right, size_t n); 15 16 UNOFLAGS(argc != 1); 17 18 eopen_stream(&left, NULL); 19 eopen_stream(&right, argv[0]); 20 21 SELECT_PROCESS_FUNCTION(&left); 22 CHECK_ALPHA_CHAN(&left); 23 CHECK_N_CHAN(&left, 4, 4); 24 25 fprint_stream_head(stdout, &left); 26 efflush(stdout, "<stdout>"); 27 process_two_streams(&left, &right, STDOUT_FILENO, "<stdout>", process); 28 return 0; 29 } 30 31 #else 32 33 static void 34 PROCESS(struct stream *left, struct stream *right, size_t n) 35 { 36 size_t i; 37 TYPE *lx, *ly, *lz, *la, *rx, *ry, *rz, *ra, x, y, z, a; 38 for (i = 0; i < n; i += 4 * sizeof(TYPE)) { 39 lx = ((TYPE *)(left->buf + i)) + 0, rx = ((TYPE *)(right->buf + i)) + 0; 40 ly = ((TYPE *)(left->buf + i)) + 1, ry = ((TYPE *)(right->buf + i)) + 1; 41 lz = ((TYPE *)(left->buf + i)) + 2, rz = ((TYPE *)(right->buf + i)) + 2; 42 la = ((TYPE *)(left->buf + i)) + 3, ra = ((TYPE *)(right->buf + i)) + 3; 43 x = *ly * *rz - *lz * *ry; 44 y = *lz * *rx - *lx * *rz; 45 z = *lx * *ry - *ly * *rx; 46 a = *la * *ra; 47 *lx = x; 48 *ly = y; 49 *lz = z; 50 *la = a; 51 } 52 } 53 54 #endif