Command-line arguments

git-svn-id: svn://cook.msm.cam.ac.uk:745/thrust3d/thrust3d@13 84d2e878-0bd5-11dd-ad15-13eda11d74c5

1 files changed, 59 insertions, 10 deletions

diff --git a/src/main.c b/src/main.c
index db6b260..32d7839 100644
--- a/src/main.c
+++ b/src/main.c
@@ -14,10 +14,12 @@
 #endif
 
 #include <stdlib.h>
+#include <stdarg.h>
 #include <unistd.h>
 #include <SDL.h>
 #include <gl.h>
 #include <glu.h>
+#include <assert.h>
 
 #include "types.h"
 #include "model.h"
@@ -26,12 +28,59 @@
 #include "physics.h"
 #include "utils.h"
 
+#define NOT_REACHED 0
+
+typedef enum {
+	RES_VGA,
+	RES_SXGA,
+	RES_WSXGA
+} ScreenResolution;
+
 int main(int argc, char *argv[]) {
 
 	SDL_Event event;
 	int finished;
 	SDL_Surface *screen;
 	int width, height;
+	int c;
+	Uint32 video_flags;
+	ScreenResolution res;
+	
+	res = RES_VGA;
+	video_flags = SDL_OPENGL;
+	
+	while ((c = getopt(argc, argv, "hr:f")) != -1) {
+	
+		switch ( c ) {
+		
+			case 'r' : {
+				if ( strcasecmp(optarg,   "vga") == 0 ) res = RES_VGA;
+				if ( strcasecmp(optarg,  "sxga") == 0 ) res = RES_SXGA;
+				if ( strcasecmp(optarg, "wsxga") == 0 ) res = RES_WSXGA;
+				break;
+			}
+			
+			case 'f' : {
+				video_flags = video_flags | SDL_FULLSCREEN;
+				break;
+			}
+						
+			case 'h' : {
+				printf("Syntax: %s [-h] [-r <res>] [-f]\n\n", argv[0]);
+				printf("A silly game.\n\n");
+				printf("  -h              Display this help message.\n");
+				printf("  -r <res>        Set display resolution.  <res> can be one of: vga, sxga or wsxga.\n");
+				printf("  -f              Use the full screen.\n");
+				return 0;
+			}
+			
+			default : {
+				return 1;
+			}
+		
+		}
+	
+	}
 	
 	/* SDL initial setup */
 	if ( SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) < 0 ) {
@@ -42,17 +91,17 @@ int main(int argc, char *argv[]) {
 	
 	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 	
-	width = 1680;  height = 1050;
-	width=640;height=480;
-	screen = SDL_SetVideoMode(width, height, 16, SDL_OPENGL);// | SDL_FULLSCREEN);
+	switch ( res ) {
+		case RES_VGA   : { width =  640;  height =  480;  break; }
+		case RES_SXGA  : { width = 1280;  height = 1024;  break; }
+		case RES_WSXGA : { width = 1680;  height = 1050;  break; }
+		default : { assert(NOT_REACHED); break; }
+	}
+	screen = SDL_SetVideoMode(width, height, 16, video_flags);
 	if ( screen == NULL ) {
-		width = 1280;  height = 1024;
-		screen = SDL_SetVideoMode(width, height, 16, SDL_OPENGL | SDL_FULLSCREEN);
-		if (screen == NULL) {
-			fprintf(stderr, "Couldn't set video mode: %s\n", SDL_GetError());
-			SDL_Quit();
-			return 1;
-		}
+		fprintf(stderr, "Couldn't set video mode: %s\n", SDL_GetError());
+		SDL_Quit();
+		return 1;
 	}
 	
 	SDL_WM_SetCaption("Thrust3D", "Thrust3D");