Implement centralized texture binding

This is to avoid redundant texture binding changes which are
costly, especially when most of the graphics are stored in a texture
atlas anyway

cocos2d/CCDirector.h

@@ -187,7 +187,8 @@ and when to execute the Scenes.
 /** returns a shared instance of the director */
 +(CCDirector *)sharedDirector;
 
-
+- (void)resetTexture;
+- (void)bindTexture:(GLuint)tex_name;
 
 // Window size
 

cocos2d/CCDirector.m

@@ -86,6 +86,23 @@ @implementation CCDirector
 @synthesize runningThread = runningThread_;
 @synthesize notificationNode = notificationNode_;
 @synthesize projectionDelegate = projectionDelegate_;
+
+
+static GLuint _tex_name;
+
+- (void)resetTexture
+{
+    _tex_name = 0;
+}
+
+- (void)bindTexture:(GLuint)tex_name
+{
+    if (tex_name != _tex_name) {
+        _tex_name = tex_name;
+        glBindTexture(GL_TEXTURE_2D, tex_name);
+    }
+}
+
 //
 // singleton stuff
 //

cocos2d/CCParticleSystemQuad.m

@@ -270,7 +270,7 @@ -(void) draw
 	// Needed states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
 	// Unneeded states: -
 
-	glBindTexture(GL_TEXTURE_2D, [texture_ name]);
+	[[CCDirector sharedDirector] bindTexture:[texture_ name]];
 
 #define kQuadSize sizeof(quads_[0].bl)
 

cocos2d/CCProgressTimer.m

@@ -518,7 +518,7 @@ -(void)draw
 	///	========================================================================
 	//	Replaced [texture_ drawAtPoint:CGPointZero] with my own vertexData
 	//	Everything above me and below me is copied from CCTextureNode's draw
-	glBindTexture(GL_TEXTURE_2D, sprite_.texture.name);
+    [[CCDirector sharedDirector] bindTexture:sprite_.texture.name];
 	glVertexPointer(2, GL_FLOAT, sizeof(ccV2F_C4B_T2F), &vertexData_[0].vertices);
 	glTexCoordPointer(2, GL_FLOAT, sizeof(ccV2F_C4B_T2F), &vertexData_[0].texCoords);
 	glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(ccV2F_C4B_T2F), &vertexData_[0].colors);

cocos2d/CCSprite.m

@@ -606,7 +606,7 @@ -(void) draw
 		glBlendFunc( blendFunc_.src, blendFunc_.dst );
 
 #define kQuadSize sizeof(quad_.bl)
-	glBindTexture(GL_TEXTURE_2D, [texture_ name]);
+    [[CCDirector sharedDirector] bindTexture:[texture_ name]];
 
 	long offset = (long)&quad_;
 

cocos2d/CCTextureAtlas.m

@@ -315,7 +315,7 @@ -(void) drawNumberOfQuads: (NSUInteger) n fromIndex: (NSUInteger) start
 	// Needed states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
 	// Unneeded states: -
 
-	glBindTexture(GL_TEXTURE_2D, [texture_ name]);
+    [[CCDirector sharedDirector] bindTexture:[texture_ name]];
 #define kQuadSize sizeof(quads_[0].bl)
 #if CC_USES_VBO
 	glBindBuffer(GL_ARRAY_BUFFER, buffersVBO_[0]);