1 /*

2 glviewvol is an OpenGL 3D volume data viewer

3 Copyright (C) 2014 John Tsiombikas <nuclear@member.fsf.org>

4

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU General Public License as published by

7 the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

9

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU General Public License for more details.

14

15 You should have received a copy of the GNU General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

18 #include <stdio.h>

19 #include <string.h>

20 #include "opt.h"

21

22 static struct {

23 const char *name;

24 RendererType rtype;

25 } rend[] = {

26 { "fast", REND_FAST },

27 { 0, REND_NONE }

28 };

29

30 Options opt;

31

32 static void init_opt()

33 {

34 opt.fname = 0;

35 opt.rend_type = REND_FAST;

36 opt.xsz = 800;

37 opt.ysz = 800;

38 }

39

40 static RendererType renderer_type(const char *name)

41 {

42 for(int i=0; rend[i].name; i++) {

43 if(strcmp(rend[i].name, name) == 0) {

44 return rend[i].rtype;

45 }

46 }

47 return REND_NONE;

48 }

49

50 int parse_args(int argc, char **argv)

51 {

52 init_opt();

53

54 for(int i=1; i<argc; i++) {

55 if(argv[i][0] == '-') {

56 if(argv[i][2] == 0) {

57 switch(argv[i][1]) {

58 case 's':

59 if(sscanf(argv[++i], "%dx%d", &opt.xsz, &opt.ysz) != 2) {

60 fprintf(stderr, "-s must be followed by the window size (WxH)\n");

61 return -1;

62 }

63 break;

64

65 case 'r':

66 if((opt.rend_type = renderer_type(argv[++i])) == REND_NONE) {

67 if(strcmp(argv[i], "help") == 0) {

68 printf("available renderers: ");

69 for(int j=0; rend[j].name; j++) {

70 printf("%s ", rend[j].name);

71 }

72 putchar('\n');

73 return -1;

74 }

75 fprintf(stderr, "unknown renderer type: %s (use -r help to show list of renderers)\n", argv[i]);

76 return -1;

77 }

78 break;

79

80 default:

81 fprintf(stderr, "invalid option: %s\n", argv[i]);

82 return -1;

83 }

84 } else {

85 fprintf(stderr, "invalid option: %s\n", argv[i]);

86 return -1;

87 }

88 } else {

89 if(opt.fname) {

90 fprintf(stderr, "unexpected argument: %s\n", argv[i]);

91 return -1;

92 }

93 opt.fname = argv[i];

94 }

95 }

96

97 return 0;

98 }