/* See LICENSE file for copyright and license details. */
#include "common.h"

USAGE("[-xyz]")

static int skip_x = 0;
static int skip_y = 0;
static int skip_z = 0;


#define PROCESS(TYPE, SUFFIX)\
	static void\
	process_##SUFFIX(struct stream *stream)\
	{\
		size_t i, n;\
		TYPE a;\
		do {\
			n = stream->ptr / stream->pixel_size;\
			for (i = 0; i < n; i++) {\
				a = ((TYPE *)(stream->buf))[4 * i + 3];\
				if (!a)\
					continue;\
				if (!skip_x)\
					((TYPE *)(stream->buf))[4 * i + 0] /= a;\
				if (!skip_y)\
					((TYPE *)(stream->buf))[4 * i + 1] /= a;\
				if (!skip_z)\
					((TYPE *)(stream->buf))[4 * i + 2] /= a;\
			}\
			n *= stream->pixel_size;\
			ewriteall(STDOUT_FILENO, stream->buf, n, "<stdout>");\
			memmove(stream->buf, stream->buf + n, stream->ptr -= n);\
		} while (eread_stream(stream, SIZE_MAX));\
		if (stream->ptr)\
			eprintf("%s: incomplete frame\n", stream->file);\
	}

PROCESS(double, lf)
PROCESS(float, f)


int
main(int argc, char *argv[])
{
	struct stream stream;
	void (*process)(struct stream *stream);

	ARGBEGIN {
	case 'x':
		skip_x = 1;
		break;
	case 'y':
		skip_y = 1;
		break;
	case 'z':
		skip_z = 1;
		break;
	default:
		usage();
	} ARGEND;

	if (argc)
		usage();

	eopen_stream(&stream, NULL);

	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(&stream);
	return 0;
}