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#import "EAGLContext+MGLAddtions.h"
#import <objc/runtime.h>
NSString *const MapboxEAGLContextWillSwitchNotificationKey = @"MapboxEAGLContextWillSwitcheNotificationKey";
NSString *const MapboxEAGLContextDidFinishSwitchedNotificationKey = @"MapboxEAGLContextDidFinishSwitchedNotificationKey";
@implementation EAGLContext (MGLAddtions)
+ (void)load{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
Class class = [self class];
SEL originalSelector = @selector(setCurrentContext:);
SEL swizzledSelector = @selector(mapbox_setCurrentContext:);
Method originalMethod = class_getClassMethod(class, originalSelector);
Method swizzledMethod = class_getClassMethod(class, swizzledSelector);
method_exchangeImplementations(originalMethod, swizzledMethod);
});
}
#pragma mark - Method Swizzling
static EAGLContext *mapboxContext = nil;
static BOOL currentContextShouldBeMapbox;
+ (BOOL)mapbox_setCurrentContext:(EAGLContext *)context{
if(context && context == mapboxContext && !currentContextShouldBeMapbox){
[[NSNotificationCenter defaultCenter]postNotificationName:MapboxEAGLContextWillSwitchNotificationKey object:nil];
return NO;
}
BOOL bRet = [self mapbox_setCurrentContext:context];
if(mapboxContext && context && context != mapboxContext && !currentContextShouldBeMapbox){
//other context has been current context
[[NSNotificationCenter defaultCenter]postNotificationName:MapboxEAGLContextDidFinishSwitchedNotificationKey object:nil];
mapboxContext = nil;
}
return bRet;
}
+ (void)becomeMapboxContext:(EAGLContext *)context{
mapboxContext = context;
currentContextShouldBeMapbox = YES;
}
+ (void)destoryMapboxContext{
currentContextShouldBeMapbox = NO;
}
@end
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