multiple character generators.

CharacterGenerator.h

@@ -8,6 +8,12 @@
 
 #import <Cocoa/Cocoa.h>
 
+enum {
+    CGApple80,
+    CGApple40,
+    CGVT52,
+    CGVT100
+};
 
 @interface CharacterGenerator : NSObject
 {
@@ -17,6 +23,9 @@
 }
 
 +(CharacterGenerator *)generator;
++(CharacterGenerator *)generatorForCharacterSet: (unsigned)characterSet;
+
+
 
 @property (nonatomic, readonly) NSSize characterSize;
 

CharacterGenerator.mm

@@ -12,6 +12,7 @@
 
 @interface CharacterGenerator ()
 -(void)loadImageNamed: (NSString *)imageName;
+-(id)initWithImageNamed: (NSString *)imageName;
 @end
 
 @implementation CharacterGenerator
@@ -38,27 +39,45 @@ static CGImageRef PNGImage(NSString *path)
 }
 #endif
 
-+(id)generator
-{
-    static CharacterGenerator *singleton = nil;
+
++(CharacterGenerator *)generatorForCharacterSet: (unsigned)characterSet {
+    
+    static CharacterGenerator *singletons[4] = {};
+    static NSString *names[] = {
+        @"a2-charset-80",
+        @"a2-charset-40",
+        @"vt52-charset",
+        @"vt100-charset",
+    };
+
+    constexpr unsigned MaxCharSet = sizeof(names) / sizeof(names[0]);
 
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
-        singleton = [[CharacterGenerator alloc] init];
+        for (unsigned i = 0; i < MaxCharSet; ++i)
+            singletons[i] = [[CharacterGenerator alloc] initWithImageNamed: names[i]];
     });
-    return singleton;
+    if (characterSet >= MaxCharSet) return nil;
+    return singletons[characterSet];
 }
 
--(id)init
+
++(id)generator
 {
+    return [self generatorForCharacterSet: CGApple80];
+}
+
+
+-(id)initWithImageNamed: (NSString *)imageName {
     if ((self = [super init]))
     {
-        [self loadImageNamed: @"a2-charset-80"];
+        [self loadImageNamed: imageName];
     }
     
     return self;
 }
 
+
 /*
  * This loads the image then split it up into 256 images.
  *