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[NewiPhoneDeveloper]

Originally Posted by digicide

Thanks for working with me on this--
With your image I get this:



I suspect I'm loading the texture wrong, perhaps on this line?

brushContext = CGBitmapContextCreate(brushData, width, width, 8, width * 4, CGImageGetColorSpace(brushImage), kCGImageAlphaPremultipliedLast);

No, that seems fine. Try the following openGL settings in your init method:

//Set up OpenGL projection matrix
		glDisable(GL_DITHER);
		glMatrixMode(GL_PROJECTION);
		glOrthof(0, frame.size.width, 0, frame.size.height, -1, 1);
		glMatrixMode(GL_MODELVIEW);
		glEnable(GL_TEXTURE_2D);
		glEnableClientState(GL_VERTEX_ARRAY);
		glEnableClientState(GL_TEXTURE_COORD_ARRAY);
		glEnable(GL_BLEND);
		glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
		glClearColor(0.0, 0.0, 0.0 ,0.0);
		glColor4f(1.0, 1.0, 1.0, 1.0);
		glEnable(GL_POINT_SPRITE_OES);
		glTexEnvf(GL_POINT_SPRITE_OES, GL_COORD_REPLACE_OES, GL_TRUE);