In need of an expert: OpenGL and drawing simple textures

Question

Hello,
Is anyone knowledgeable about loading sprites with an alpha channel?
This is the code I am using to load my sprites. The image files were png files with an alpha channel(parts where you can see through the image). But when loading it the parts that are supposed to be invisible turn out to be black.
I have searched far and wide across the internet and what a surprise I only see solutions for mobile phones other than the iphone! It would be great help to the iphone community if someone can be kind enough to point out what it is thats supposed to be done to get this to work.
{CODE}
myTexture = Texture2D alloc initWithData:data bytes pixelFormat:kTexture2DPixelFormatRGBAPVRTC4 pixelsWide:512 pixelsHigh:512 contentSize:CGSizeMake(512,512);
{CODE}
then running the following in drawView:
{CODE}
myTexture drawAtPoint:CGPointMake(0,0);
{CODE}
the result is the texture showing correctly except the invisible parts turn out black. Perhaps I have to set something in the drawView? Please If anyone out there can help.
Message was edited by: Darpachief

Answer 1

You may need to enable alpha blending systemwide, e.g. glEnable (GL_BLEND), as well as glBlendFunc(), glAlphaFunc(), etc.