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	blind-vector-projection.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-vector-projection.c (1697B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #ifndef TYPE
	3 #include "common.h"
	4
	5 USAGE("[-r \| -s] plane-stream")
	6
	7 static int level = 1;
	8
	9 #define FILE "blind-vector-projection.c"
	10 #include "define-functions.h"
	11
	12 int
	13 main(int argc, char *argv[])
	14 {
	15 struct stream left, right;
	16 void (process)(struct stream left, struct stream *right, size_…
	17
	18 ARGBEGIN {
	19 case 'r':
	20 if (level == 0)
	21 usage();
	22 level = 2;
	23 break;
	24 case 's':
	25 if (level == 2)
	26 usage();
	27 level = 0;
	28 break;
	29 default:
	30 usage();
	31 } ARGEND;
	32
	33 if (argc != 1)
	34 usage();
	35
	36 eopen_stream(&left, NULL);
	37 eopen_stream(&right, argv[0]);
	38
	39 SELECT_PROCESS_FUNCTION(&left);
	40 CHECK_ALPHA_CHAN(&left);
	41 CHECK_N_CHAN(&left, 4, 4);
	42
	43 fprint_stream_head(stdout, &left);
	44 efflush(stdout, "<stdout>");
	45 process_two_streams(&left, &right, STDOUT_FILENO, "<stdout>", pr…
	46 return 0;
	47 }
	48
	49 #else
	50
	51 static void
	52 PROCESS(struct stream left, struct stream right, size_t n)
	53 {
	54 size_t i;
	55 TYPE lx, ly, lz, la, rx, ry, rz, ra, x, y, z, a, norm;
	56 for (i = 0; i < n; i += 4 * sizeof(TYPE)) {
	57 lx = ((TYPE )(left->buf + i)) + 0, rx = ((TYPE )(right…
	58 ly = ((TYPE )(left->buf + i)) + 1, ry = ((TYPE )(right…
	59 lz = ((TYPE )(left->buf + i)) + 2, rz = ((TYPE )(right…
	60 la = ((TYPE )(left->buf + i)) + 3, ra = ((TYPE )(right…
	61 norm = rx * rx + ry * ry + rz * rz + ra * ra;
	62 norm = sqrt(norm);
	63 x = y = z = a = lx rx + ly ry + lz rz + la r…
	64 if (level) {
	65 x *= rx;
	66 y *= ry;
	67 z *= rz;
	68 a *= rz;
	69 if (level > 1) {
	70 x = *lx - x;
	71 y = *ly - y;
	72 z = *lz - z;
	73 a = *la - a;
	74 }
	75 }
	76 *lx = x;
	77 *ly = y;
	78 *lz = z;
	79 *la = a;
	80 }
	81 }
	82
	83 #endif