我正在 cocos2d 中编写一个模态层，我想使用 OpenGL glScissorAPI 调用来裁剪CCScrollLayer我正在使用的 a 的内部，
基本上，
- 呈现某种模态精灵
- 将带有资产的 CCScrollLayer 放在模态精灵上
- 我想裁剪 CCScrollLayer 使其不会溢出精灵。
看起来很简单。
我遇到的问题是该visit功能似乎永远不会被击中，因此glScissor永远不会被实现。
我不确定我做错了什么。
我做模态的方式是使用块来处理是和否条件/状态。
// This appears in my "Pick City scene"
-(id) init
{
if ((self = [super init]))
{
NSLog(@"City list");
for (City *cityObj in listOfCities)
{
citySpriteOff = [CCSprite spriteWithSpriteFrameName:@"city.png"];
citySpriteOn = [CCSprite spriteWithSpriteFrameName:@"city_on.png"];
int x = [cityObj.x intValue];
int y = [cityObj.y intValue];
CCMenuItemSprite *mapMenuItem = [CCMenuItemSprite itemFromNormalSprite:citySpriteOff selectedSprite:citySpriteOn target:self selector:@selector(btnCity:)];
[mapMenuItem setTag:i];
[mapMenuItem setIsRelativeAnchorPoint:YES];
[mapMenuItem setAnchorPoint:CGPointMake(0, 0)];
[mapMenuItem setPosition:CGPointMake(x, y)];
[mapMenuItem setIsEnabled:YES];
[mapMenu addChild:mapMenuItem];
i++;
} // next
[self addChild:mapMenu z:2];
}
}
-(void) btnCity:(id)sender
{
NSLog(@"clicked a city button");
int tag = [sender tag];
City *cityObj = [listOfCities objectAtIndex:tag];
NSLog(@"You clicked on city: %@", cityObj.name);
[self lockLayers];
CCLayer *layer = [CCLayer node];
[self addChild:layer z:100];
[MapModalLayer ConfirmCity:cityObj onLayer:layer yesBlock:^{[self btnConfirmedCity:cityObj];} noBlock:^{[self unlockLayers];}];
}
-(void) btnConfirmedCity:(City *)cityObj
{
NSLog(@"confirmed city: %@", cityObj.name);
}
#pragma mark - Lock/Unlock layers
-(void) lockLayers
{
[self MenuStatus:NO Node:self];
}
-(void) unlockLayers
{
[self MenuStatus:YES Node:self];
}
// Disabled/Enable layers
-(void) MenuStatus:(BOOL)_enable Node:(id)_node
{
for (id result in ((CCNode *)_node).children) {
if ([result isKindOfClass:[CCMenu class]]) {
for (id result1 in ((CCMenu *)result).children) {
if ([result1 isKindOfClass:[CCMenuItem class]]) {
((CCMenuItem *)result1).isEnabled = _enable;
}
}
}
else
[self MenuStatus:_enable Node:result];
} // next
}
实际的模态代码出现在这里，
@implementation MapModalLayer
- (id)init {
self = [super init];
if (self) {
// This method never seems to be called
NSLog(@"MapModalLayer init");
}
return self;
}
// This method never seems to be called
- (void) visit {
NSLog(@"Visit");
if (!self.visible)
return;
glPushMatrix();
glEnable(GL_SCISSOR_TEST);
glScissor(50, 50, 100 , 150);
[super visit];
glDisable(GL_SCISSOR_TEST);
glPopMatrix();
}
+ (void) CloseAlert: (CCSprite*) alertDialog onCoverLayer: (CCLayer*) coverLayer executingBlock: (void(^)())block {
// shrink dialog box
[alertDialog runAction:[CCScaleTo actionWithDuration:kAnimationTime scale:0]];
// in parallel, fadeout and remove cover layer and execute block
// (note: you can't use CCFadeOut since we don't start at opacity 1!)
[coverLayer runAction:[CCSequence actions:
[CCFadeTo actionWithDuration:0.2f opacity:0],
[CCCallBlock actionWithBlock:^{
[coverLayer removeFromParentAndCleanup:YES];
if (block) block();
}],
nil]];
}
+(void) ConfirmCity:(City *)cityObj onLayer:(CCLayer *)layer yesBlock :(void (^)())yesBlock noBlock:(void (^)())noBlock
{
CCLayerColor *coverLayer = [CoverLayer new];
[layer addChild:coverLayer z:INT_MAX]; // put to the very top to block application touches
[coverLayer runAction:[CCFadeTo actionWithDuration:kAnimationTime opacity:80]]; // smooth fade-in to dim with semi-transparency
CGSize winSize = [[CCDirector sharedDirector] winSize];
CCSprite *dialog = [CCSprite spriteWithSpriteFrameName:@"modal.png"];
[dialog setPosition:CGPointMake(winSize.width/2,winSize.height/2)];
[dialog setTag:kDialogTag];
//
// We put our CCScrollLayer *scroller content here... it doesn't matter what it is right now
//
//
// Finally we put our accept/reject buttons
//
// Tick/Cross buttons
CCSprite *closeButtonOn = [CCSprite spriteWithSpriteFrameName:@"btn_close.png"];
CCSprite *tickButtonOn = [CCSprite spriteWithSpriteFrameName:@"btn_accept.png"];
// add one or two buttons, as needed
CCMenuItemSprite *opt1Button = [CCMenuItemSprite itemFromNormalSprite:closeButtonOn
selectedSprite:nil
block:^(id sender){
// close alert and call opt1block when first button is pressed
[self CloseAlert:dialog onCoverLayer: coverLayer executingBlock:noBlock];
} ];
[opt1Button setPosition:CGPointMake(-200, -120)];
// create second button, if requested
CCMenuItemSprite *opt2Button = [CCMenuItemSprite itemFromNormalSprite:tickButtonOn
selectedSprite:nil
block:^(id sender){
// close alert and call opt2block when second button is pressed
[self CloseAlert:dialog onCoverLayer: coverLayer executingBlock:yesBlock];
} ];
[opt2Button setPosition:CGPointMake(40, -120)];
CCMenu *menu = [CCMenu menuWithItems:opt1Button, opt2Button, nil];
[menu setContentSize:dialog.contentSize];
[dialog addChild:menu z:2];
[coverLayer addChild:dialog];
}
@end
我认为这是因为我只使用 MapModalLayer 的私有方法。
但我不确定。
有没有办法让我glScissor像上面解释的那样在模态中使用？
我已经尝试将glScissor代码移动到模式的显示，但它似乎从来没有做任何事情。
为了确认它工作正常，我将glScissor代码移到了父级，它似乎工作正常。
因此，我如何使模态层使用/工作glScissor？