IPhone: OpenGL ES Texturing

Question

I just began writing an iPhone game and I'm having difficulties displaying multiple textures.
Only the last texture I generate is appearing and all the textures I generated previously appear white.
Here is major rendering functions so far, is there anything that stands out as incorrect?
//Generates textures for a game object
- (void)GenerateTextures:(Hairball::Objects)Obj
CGImageRef spriteImage;
CGContextRef spriteContext;
GLubyte *spriteData;
size_t width, height;
GLuint *tempTex;
// Creates a Core Graphics image from an image file
switch (Obj)
case Hairball::PLAYER:
spriteImage = [UIImage imageNamed:@"Sprite.png"].CGImage;
tempTex = &(TextureArray[0]);
break;
case Hairball::BACKGROUND:
spriteImage = [UIImage imageNamed:@"BG1.png"].CGImage;
tempTex = &(TextureArray[1]);
break;
case Hairball::HUD:
spriteImage = [UIImage imageNamed:@"Icon.png"].CGImage;
tempTex = &(TextureArray[2]);
break;
default:
break;
// Get the width and height of the image
width = CGImageGetWidth(spriteImage);
height = CGImageGetHeight(spriteImage);
if(spriteImage)
// Allocated memory needed for the bitmap context
spriteData = (GLubyte *) malloc(width * height * 4);
// Uses the bitmatp creation function provided by the Core Graphics framework.
spriteContext = CGBitmapContextCreate(spriteData, width, height, 8, width * 4, CGImageGetColorSpace(spriteImage), kCGImageAlphaPremultipliedLast);
// After you create the context, you can draw the sprite image to the context.
CGContextDrawImage(spriteContext, CGRectMake(0.0, 0.0, (CGFloat)width, (CGFloat)height), spriteImage);
// You don't need the context at this point, so you need to release it to avoid memory leaks.
CGContextRelease(spriteContext);
// Use OpenGL ES to generate a name for the texture.
glGenTextures(1, tempTex);
// Bind the texture name.
glBindTexture(GLTEXTURE2D, *tempTex);
// Speidfy a 2D texture image, provideing the a pointer to the image data in memory
glTexImage2D(GLTEXTURE2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GLUNSIGNEDBYTE, spriteData);
// Release the image data
free(spriteData);
//Inits OpenGl for drawing
- (void)setupView
//Creates object Manager to handle
ObjectMgr = new ObjectManager();
//Create Objects
GameObject* Object1 = new GameObject(Hairball::BACKGROUND, 0.0f, 0.0f, 0.0f, 0.0f, 3.2f, 3.2f);
ObjectMgr->AddToList(Object1);
GameObject* Object2 = new GameObject(Hairball::PLAYER, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f);
ObjectMgr->AddToList(Object2);
//Generate all textures
[self GenerateTextures:Hairball::PLAYER];
[self GenerateTextures:Hairball::BACKGROUND];
//For each obj assign a texture
std::list<GameObject*>::iterator Object = (ObjectMgr->mObjectList.begin());
std::list<GameObject*>::iterator End = (ObjectMgr->mObjectList.end());
//For each game object
while(Object != End)
//Apply texture to each object
switch ((*Object)->mObjectType)
case Hairball::PLAYER: (*Object)->mSpriteTexture = TextureArray[0]; break;
case Hairball::BACKGROUND: (*Object)->mSpriteTexture = TextureArray[1]; break;
case Hairball::HUD: (*Object)->mSpriteTexture = TextureArray[2]; break;
default:
break;
++Object;
// Clears the view with grey
glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
// Set the texture parameters to use a minifying filter and a linear filer (weighted average)
glTexParameteri(GLTEXTURE2D, GLTEXTURE_MINFILTER, GL_LINEAR);
// Enable use of the texture
glEnable(GLTEXTURE2D);
// Set a blending function to use
glBlendFunc(GL_ONE, GLONE_MINUS_SRCALPHA);
// Enable blending
glEnable(GL_BLEND);
- (void)drawView
[EAGLContext setCurrentContext:context];
glBindFramebufferOES(GLFRAMEBUFFEROES, viewFramebuffer);
glViewport(0, 0, backingWidth, backingHeight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrthof(-1.0f, 1.0f, -1.5f, 1.5f, -1.0f, 1.0f);
glMatrixMode(GL_MODELVIEW);
//Clear the backbuffer
glClear(GLCOLOR_BUFFERBIT);
std::list<GameObject*>::iterator Object = (ObjectMgr->mObjectList.begin());
std::list<GameObject*>::iterator End = (ObjectMgr->mObjectList.end());
//For each game object
while(Object != End)
// Bind the texture name.
glBindTexture(GLTEXTURE2D, (*Object)->mSpriteTexture);
//apply transformations
glPushMatrix();
glTranslatef((*Object)->mPosition.x, (*Object)->mPosition.y, (*Object)->mPosition.z);
glRotatef((*Object)->mRotation, 0.0f, 0.0f, 1.0f);
(*Object)->mRotation += 0.5f; //Rotate
//Get current sprites verticies
glVertexPointer(2, GL_FLOAT, 0, (*Object)->mSpriteVertices);
glEnableClientState(GLVERTEXARRAY);
//Get current sprites tex coords
glTexCoordPointer(2, GL_SHORT, 0, (*Object)->mSpriteTexcoords);
glEnableClientState(GLTEXTURE_COORDARRAY);
//Render the vertex array
glDrawArrays(GLTRIANGLESTRIP, 0, 4);
//pop the transformation matrix
glPopMatrix();
++Object;
glBindRenderbufferOES(GLRENDERBUFFEROES, viewRenderbuffer);
[context presentRenderbuffer:GLRENDERBUFFEROES];
}

Answer 1

The value generated by glGenTextures() in (*Object)->mSpriteTexture for the BACKGROUND object is 1 and for the sprite object it is 2. Which appear to be correct values?
If I exchange:
self GenerateTextures:Hairball::PLAYER;
self GenerateTextures:Hairball::BACKGROUND;
To
self GenerateTextures:Hairball::BACKGROUND;
self GenerateTextures:Hairball::PLAYER;
then my scene goes from this:
http://img207.imageshack.us/img207/8229/picture1nf6.png
to this:
http://img253.imageshack.us/img253/5282/picture2gr8.png
So both textures draw, just not at the same time?
Oh, here it is formatted better:
//Generates textures for a game object
- (void)GenerateTextures:(Hairball::Objects)Obj
CGImageRef spriteImage;
CGContextRef spriteContext;
GLubyte *spriteData;
size_t width, height;
int texIndex = 0;
// Creates a Core Graphics image from an image file
switch (Obj)
case Hairball::PLAYER:
spriteImage = [UIImage imageNamed:@"Sprite.png"].CGImage;
texIndex = 0;
break;
case Hairball::BACKGROUND:
spriteImage = [UIImage imageNamed:@"BG1.png"].CGImage;
texIndex = 1;
break;
case Hairball::HUD:
spriteImage = [UIImage imageNamed:@"Icon.png"].CGImage;
texIndex = 2;
break;
default:
break;
// Get the width and height of the image
width = CGImageGetWidth(spriteImage);
height = CGImageGetHeight(spriteImage);
if(spriteImage)
// Allocated memory needed for the bitmap context
spriteData = (GLubyte *) malloc(width * height * 4);
// Uses the bitmatp creation function provided by the Core Graphics framework.
spriteContext = CGBitmapContextCreate(spriteData, width, height, 8, width * 4, CGImageGetColorSpace(spriteImage), kCGImageAlphaPremultipliedLast);
// After you create the context, you can draw the sprite image to the context.
CGContextDrawImage(spriteContext, CGRectMake(0.0, 0.0, (CGFloat)width, (CGFloat)height), spriteImage);
// You don't need the context at this point, so you need to release it to avoid memory leaks.
CGContextRelease(spriteContext);
// Bind the texture name.
glBindTexture(GLTEXTURE2D, TextureArray[texIndex]);
// Speidfy a 2D texture image, provideing the a pointer to the image data in memory
glTexImage2D(GLTEXTURE2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GLUNSIGNEDBYTE, spriteData);
// Release the image data
free(spriteData);
//Inits OpenGl for drawing
- (void)setupView
//Creates object Manager to handle
ObjectMgr = new ObjectManager();
//Create Objects
GameObject* Object1 = new GameObject(Hairball::BACKGROUND, 0.0f, 0.0f, 0.0f, 0.0f, 3.2f, 3.2f);
ObjectMgr->AddToList(Object1);
GameObject* Object2 = new GameObject(Hairball::PLAYER, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f);
ObjectMgr->AddToList(Object2);
//Generate all textures
glGenTextures(NUMTEXTURES, TextureArray); // Use OpenGL ES to generate a name for the texture.
[self GenerateTextures:Hairball::BACKGROUND];
[self GenerateTextures:Hairball::PLAYER];
//For each obj assign a texture
std::list<GameObject*>::iterator Object = (ObjectMgr->mObjectList.begin());
std::list<GameObject*>::iterator End = (ObjectMgr->mObjectList.end());
//For each game object
while(Object != End)
//Apply texture to each object
switch ((*Object)->mObjectType)
case Hairball::PLAYER: (*Object)->mSpriteTexture = TextureArray[0]; break;
case Hairball::BACKGROUND: (*Object)->mSpriteTexture = TextureArray[1]; break;
case Hairball::HUD: (*Object)->mSpriteTexture = TextureArray[2]; break;
default:
break;
++Object;
// Clears the view with grey
glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
// Set the texture parameters to use a minifying filter and a linear filer (weighted average)
glTexParameteri(GLTEXTURE2D, GLTEXTURE_MINFILTER, GL_LINEAR);
// Enable use of the texture
glEnable(GLTEXTURE2D);
// Set a blending function to use
glBlendFunc(GL_ONE, GLONE_MINUS_SRCALPHA);
// Enable blending
glEnable(GL_BLEND);
- (void)drawView
[EAGLContext setCurrentContext:context];
glBindFramebufferOES(GLFRAMEBUFFEROES, viewFramebuffer);
glViewport(0, 0, backingWidth, backingHeight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrthof(-1.0f, 1.0f, -1.5f, 1.5f, -1.0f, 1.0f);
glMatrixMode(GL_MODELVIEW);
//Clear the backbuffer
glClear(GLCOLOR_BUFFERBIT);
std::list<GameObject*>::iterator Object = (ObjectMgr->mObjectList.begin());
std::list<GameObject*>::iterator End = (ObjectMgr->mObjectList.end());
//For each game object
while(Object != End)
// Bind the texture name.
glBindTexture(GLTEXTURE2D, (*Object)->mSpriteTexture);
//apply transformations
glPushMatrix();
glTranslatef((*Object)->mPosition.x, (*Object)->mPosition.y, (*Object)->mPosition.z);
glRotatef((*Object)->mRotation, 0.0f, 0.0f, 1.0f);
//(*Object)->mRotation += 0.5f; //Rotate
//Get current sprites verticies
glVertexPointer(2, GL_FLOAT, 0, (*Object)->mSpriteVertices);
glEnableClientState(GLVERTEXARRAY);
//Get current sprites tex coords
glTexCoordPointer(2, GL_SHORT, 0, (*Object)->mSpriteTexcoords);
glEnableClientState(GLTEXTURE_COORDARRAY);
//Render the vertex array
glDrawArrays(GLTRIANGLESTRIP, 0, 4);
//pop the transformation matrix
glPopMatrix();
++Object;
glBindRenderbufferOES(GLRENDERBUFFEROES, viewRenderbuffer);
[context presentRenderbuffer:GLRENDERBUFFEROES];