Added -g cmdline option for gamma correction, from chmmravatar

git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@855 8092fc87-c524-0410-9efc-e669fe64eaf9

sc2/ChangeLog

@@ -1,4 +1,5 @@
 Changes towards version 0.3:
+- Added -g option to control gamma correction, from chmmravatar
 - Restored the CondBank to actually use condition variables properly
   (resolves a race condition under OpenBSD)
 - Removed aspects of the legacy graphics code that are never used or that

sc2/src/sc2code/libs/graphics/gfx_common.h

@@ -61,6 +61,7 @@ extern int FrameRateTickBase;
 
 void TFB_FlushGraphics (void); // Only call from main thread!!
 
+void TFB_SetGamma (float gamma);
 // Unknown Stuff
 
 extern int ScreenWidth;

sc2/src/sc2code/libs/graphics/sdl/sdl_common.c

@@ -641,4 +641,17 @@ TFB_FlushGraphics () // Only call from main thread!!
 	BroadcastCondVar (RenderingCond);
 }
 
+void
+TFB_SetGamma (float gamma)
+{
+	if (SDL_SetGamma (gamma, gamma, gamma) == -1)
+	{
+		fprintf (stderr, "Unable to set gamma correction.\n");
+	}
+	else
+	{
+		fprintf (stderr, "Gamma correction set to %1.4f.\n", gamma);
+	}
+}
+
 #endif

sc2/src/starcon2.c

@@ -88,6 +88,7 @@ main (int argc, char *argv[])
 	int vol;
 	int val;
 	char contentdir[1000];
+	float gamma = 1.0;
 
 	enum
 	{
@@ -116,6 +117,7 @@ main (int argc, char *argv[])
 		{"audioquality", 1, NULL, 'q'},
 		{"nosubtitles", 0, NULL, 'u'},
 		{"music", 1, NULL, 'm'},
+		{"gamma", 1, NULL, 'g'},
 		//  options with no short equivalent
 		{"cscan", 1, NULL, CSCAN_OPT},
 		{"menu", 1, NULL, MENU_OPT},
@@ -137,7 +139,7 @@ main (int argc, char *argv[])
 	strcpy (contentdir, "content");
 #endif
 
-	while ((c = getopt_long(argc, argv, "r:d:foc:spn:?hM:S:T:m:q:u", long_options, &option_index)) != -1)
+	while ((c = getopt_long(argc, argv, "r:d:foc:spn:?hM:S:T:m:q:ug:", long_options, &option_index)) != -1)
 	{
 		switch (c) {
 			case 'r':
@@ -225,6 +227,9 @@ main (int argc, char *argv[])
 						long_options[option_index].name)) != -1)
 					optWhichMusic = val;
 			break;
+			case 'g':
+				sscanf(optarg, "%f", &gamma);
+			break;
 			case CSCAN_OPT:
 				if ((val = Check_PC_3DO_opt (optarg, 
 						OPT_PC | OPT_3DO, 
@@ -275,6 +280,7 @@ main (int argc, char *argv[])
 				printf("  -c, --scale=mode (bilinear, biadapt or biadv, default is none)\n");
 				printf("  -s, --scanlines (default off)\n");
 				printf("  -p, --fps (default off)\n");
+				printf("  -g, --gamma=CORRECTIONVALUE (default 1.0, which causes no change)\n");
 				printf("  -n, --contentdir=CONTENTDIR\n");
 				printf("  -M, --musicvol=VOLUME (0-100, default 100)\n");
 				printf("  -S, --sfxvol=VOLUME (0-100, default 100)\n");
@@ -314,6 +320,7 @@ main (int argc, char *argv[])
 	init_xform_control ();
 
 	TFB_InitGraphics (gfxdriver, gfxflags, width, height, bpp);
+	TFB_SetGamma (gamma);
 	TFB_InitSound (snddriver, soundflags);
 	TFB_InitInput (TFB_INPUTDRIVER_SDL, 0);