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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-m] X Y Z dual-X dual-Y dual-Z dual-stream")
static double X1, Y1, Z1, X2, Y2, Z2;
#define PROCESS(TYPE)\
do {\
size_t i;\
TYPE x1k = (TYPE)X1, y1k = (TYPE)Y1, z1k = (TYPE)Z1;\
TYPE x2k = (TYPE)X2, y2k = (TYPE)Y2, z2k = (TYPE)Z2;\
TYPE x1, y1, z1, a1, x2, y2, z2, a2;\
TYPE alpha, xalpha, yalpha, zalpha;\
for (i = 0; i < n; i += stream->pixel_size) {\
x1 = ((TYPE *)(stream->buf + i))[0];\
y1 = ((TYPE *)(stream->buf + i))[1];\
z1 = ((TYPE *)(stream->buf + i))[2];\
a1 = ((TYPE *)(stream->buf + i))[3];\
x2 = ((TYPE *)(dual->buf + i))[0];\
y2 = ((TYPE *)(dual->buf + i))[1];\
z2 = ((TYPE *)(dual->buf + i))[2];\
a2 = ((TYPE *)(dual->buf + i))[3];\
if (x1 == x2 && y1 == y2 && z1 == z2) {\
if (a1 != a2)\
((TYPE *)(stream->buf + i))[3] = (a1 + a2) / 2;\
continue;\
}\
xalpha = x1 == x2 ? (TYPE)0 : (x2 - x1 + x1k - x2k) / (x1k - x2k);\
yalpha = y1 == y2 ? (TYPE)0 : (y2 - y1 + y1k - y2k) / (y1k - y2k);\
zalpha = z1 == z2 ? (TYPE)0 : (z2 - z1 + z1k - z2k) / (z1k - z2k);\
alpha = xalpha > yalpha ? xalpha : yalpha;\
alpha = alpha > zalpha ? alpha : zalpha;\
if (!alpha) {\
((TYPE *)(stream->buf + i))[0] = (TYPE)0;\
((TYPE *)(stream->buf + i))[1] = (TYPE)0;\
((TYPE *)(stream->buf + i))[2] = (TYPE)0;\
((TYPE *)(stream->buf + i))[3] = (TYPE)0;\
} else {\
((TYPE *)(stream->buf + i))[0] = ((x1 - x1k + x2 - x2k) / alpha + x1k + x2k) / 2;\
((TYPE *)(stream->buf + i))[1] = ((y1 - y1k + y2 - y2k) / alpha + y1k + y2k) / 2;\
((TYPE *)(stream->buf + i))[2] = ((z1 - z1k + z2 - z2k) / alpha + z1k + z2k) / 2;\
((TYPE *)(stream->buf + i))[3] = (a1 + a2) / 2 * alpha;\
}\
}\
} while (0)
static void process_lf(struct stream *stream, struct stream *dual, size_t n) {PROCESS(double);}
static void process_f (struct stream *stream, struct stream *dual, size_t n) {PROCESS(float);}
int
main(int argc, char *argv[])
{
struct stream stream, dual;
void (*process)(struct stream *stream, struct stream *dual, size_t n);
UNOFLAGS(argc != 7);
X1 = etolf_arg("the X value", argv[0]);
Y1 = etolf_arg("the Y value", argv[1]);
Z1 = etolf_arg("the Z value", argv[2]);
X2 = etolf_arg("the dual-X value", argv[3]);
Y2 = etolf_arg("the dual-Y value", argv[4]);
Z2 = etolf_arg("the dual-Z value", argv[5]);
eopen_stream(&stream, NULL);
eopen_stream(&dual, argv[6]);
if (!strcmp(stream.pixfmt, "xyza"))
process = process_lf;
else if (!strcmp(stream.pixfmt, "xyza f"))
process = process_f;
else
eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
process_two_streams(&stream, &dual, STDOUT_FILENO, "<stdout>", process);
return 0;
}
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