Minor CCClippingNode and transition fixes.

Author: slembcke

cocos2d/CCClippingNode.m

@@ -278,6 +278,7 @@ - (void)visit
         CCGLProgram *program = [[CCShaderCache sharedShaderCache] programForKey:kCCShader_PositionTextureColorAlphaTest];
         GLint alphaValueLocation = glGetUniformLocation(program.program, kCCUniformAlphaTestValue_s);
         // set our alphaThreshold
+        [program use];
         [program setUniformLocation:alphaValueLocation withF1:_alphaThreshold];
         // we need to recursively apply this shader to all the nodes in the stencil node
         // XXX: we should have a way to apply shader to all nodes without having to do this

cocos2d/CCTransition.h

@@ -94,6 +94,12 @@ typedef NS_ENUM(NSInteger, CCTransitionDirection)
  */
 @property (nonatomic, assign) CCTexturePixelFormat transitionPixelFormat;
 
+/**
+ *  Depth/stencil format used for transition.
+ *  Default GL_DEPTH24_STENCIL8_OES.
+ */
+@property (nonatomic, assign) GLuint transitionDepthStencilFormat;
+
 /**
  *  Defines whether outgoing scene will be animated during transition.
  *  Default NO.

cocos2d/CCTransition.m

@@ -164,7 +164,8 @@ - (id)initWithDuration:(NSTimeInterval)duration
     _runTime = 0.0f;
     _progress = 0.0f;
 
-    _transitionPixelFormat = CCTexturePixelFormat_RGB565;
+    _transitionPixelFormat = CCTexturePixelFormat_RGBA8888;
+		_transitionDepthStencilFormat = GL_DEPTH24_STENCIL8_OES;
 
     // disable touch during transition
     self.userInteractionEnabled = NO;
@@ -197,15 +198,15 @@ - (void)startTransition:(CCScene *)scene
     // create texture for outgoing scene
     _outgoingTexture = [CCRenderTexture renderTextureWithWidth:rect.size.width / _outgoingDownScale
                                                         height:rect.size.height / _outgoingDownScale
-                                                   pixelFormat:_transitionPixelFormat];
+                                                   pixelFormat:_transitionPixelFormat depthStencilFormat:_transitionDepthStencilFormat];
     _outgoingTexture.position = CGPointMake(rect.size.width * 0.5f + rect.origin.x, rect.size.height * 0.5f + rect.origin.y);
     _outgoingTexture.scale = _outgoingDownScale;
     [self addChild:_outgoingTexture z:_outgoingOverIncoming];
 
     // create texture for incoming scene
     _incomingTexture = [CCRenderTexture renderTextureWithWidth:rect.size.width / _incomingDownScale
                                                         height:rect.size.height / _incomingDownScale
-                                                   pixelFormat:_transitionPixelFormat];
+                                                   pixelFormat:_transitionPixelFormat depthStencilFormat:_transitionDepthStencilFormat];
     _incomingTexture.position = CGPointMake(rect.size.width * 0.5f + rect.origin.x, rect.size.height * 0.5f + rect.origin.y);
     _incomingTexture.scale = _incomingDownScale;
     [self addChild:_incomingTexture];
@@ -277,7 +278,7 @@ - (void)renderOutgoing:(float)progress
     _outgoingScene.scale = oldScale / _outgoingDownScale;
 
     glGetFloatv(GL_COLOR_CLEAR_VALUE, clearColor);
-    [_outgoingTexture beginWithClear:clearColor[0] g:clearColor[1] b:clearColor[2] a:clearColor[3]];
+    [_outgoingTexture beginWithClear:clearColor[0] g:clearColor[1] b:clearColor[2] a:clearColor[3] depth:1.0 stencil:0];
     [_outgoingScene visit];
     [_outgoingTexture end];
 
@@ -294,7 +295,7 @@ - (void)renderIncoming:(float)progress
     _incomingScene.scale = oldScale / _incomingDownScale;
 
     glGetFloatv(GL_COLOR_CLEAR_VALUE, clearColor);
-    [_incomingTexture beginWithClear:clearColor[0] g:clearColor[1] b:clearColor[2] a:clearColor[3]];
+    [_incomingTexture beginWithClear:clearColor[0] g:clearColor[1] b:clearColor[2] a:clearColor[3] depth:1.0 stencil:0];
     [_incomingScene visit];
     [_incomingTexture end];