ozirus Wrote:Hi Talyn,

Although it does not make any use of the Texture2D class, you might want to have a look at the GLSprite example from Apple Sample Code. It describes how to render a textured quad.

Image data is read with the following calls:
- CGBitmapContextCreate()
- CGContextDrawImage()

I hope this helps.

AnotherJake Wrote:Yes, more code might help. There are a few things I noticed though:

- did you glEnable(GL_TEXTURE_2D)?
- Texture2D uses CoreGraphics to load, so your textures get premultiplied alpha, which means you need to use glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA).
- Don't use bmp, use png or jpg instead. Not a big deal, but there is no logical reason to ever use anything else IMHO.

AnotherJake Wrote:If that's what you're really using, then it most certainly will not work. There are several issues I see right off the bat. Here is more like what it should be:

Code:

Texture2D    *testTex = nil;
Texture2D    *backgroundTex = nil;

- (void)myDraw
{
    CGRect            bounds;
    
    bounds = [self bounds];
    
    // all textures need these
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    glEnable(GL_TEXTURE_2D);
    
    if (backgroundTex == nil)
        backgroundTex = [[Texture2D alloc] initWithImage:[UIImage imageNamed:@"Background.png"]];
    
    // background doesn't need blending
    glDisable(GL_BLEND);
    
    [backgroundTex drawInRect:bounds];
    
    if (testTex == nil)
        testTex = [[Texture2D alloc] initWithString:@"TEST" dimensions:CGSizeMake(64, 64) alignment:UITextAlignmentCenter fontName:@"Helvetica" fontSize:14];
    
    // text will need blending
    glEnable(GL_BLEND);
    
    // text from Texture2D uses A8 tex format, so needs GL_SRC_ALPHA
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    [testTex drawAtPoint:CGPointMake(bounds.size.width * 0.5f, bounds.size.height * 0.5f)];
    
    // switch it back to GL_ONE for other types of images, rather than text because Texture2D uses CG to load, which premultiplies alpha
    glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
    
    // ... other drawing
}

Talyn Wrote:Thanks a lot AnotherJake! However, even THAT doesn't work. It must be how my render engine is set up, and I'm not going to slave over this for any longer. I think I'm just going to move to libpng and do my own texture loading and drawing. Again, thanks for the help AnotherJake.

AnotherJake Wrote:Don't give up yet! We'll get it working.

Texture2D works great, and libpng isn't going to magically fix anything. The only bonus you could get out of libpng is that it won't premultiply your alpha, but that doesn't have anything to do with nothing being drawn for you right now. Plus, libpng won't render text for you either, which you get for free with Texture2D.

BTW, if you are still getting the "Image is NULL" issue when you're trying to load your background, that has to be taken care of first. Be sure you have added it to your project under the Resources folder so it gets copied into the app bundle.

Talyn Wrote:The question is now, where to restart?

AnotherJake Wrote:I'll try to whip up a small example using that template in a little bit.