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POWith a 2D iPhone OpenGL ES 1.1 app, how do I get my depth buffer working for textures?
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copied!<p>I'm making a 2D videogame. Right now I don't have that many sprites and one texture with no depth buffer works fine. But when I expand to multiple textures I want to use a depth buffer so that I don't have to make multiple passes over the same texture and so that I don't have to organize my textures with respect to any depth constraints.</p> <p>When I try to get the depth buffer working I can only get a blank screen with the correct clear color. I'm going to explain my working setup without the depth buffer and list questions I have for upgrading to the depth buffer:</p> <ul> <li><p>Right now my vertices only have position(x,y) and texture(x,y) coords. There is nothing else. No lighting, no normals, no color, etc. Is it correct that the only upgrade I have to make here is to add a z coord to my position?</p></li> <li><p>Right now I am using:</p></li> </ul> <pre>glOrthof(-2, 2, -3, 3, -1, 1);</pre> <p>this works with no depth buffer. But when I add the depth buffer I think I need to change the near and far values. What should I change them to?</p> <ul> <li>Right now for my glTexImage2D() I am using:</li> </ul> <pre>glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size.x, size.y, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);</pre> <p>when I add the depth buffer do I have to change any of those arguments?</p> <ul> <li>With my call to <code>glClearDepthf();</code>, should I be using one of the near or far values that I use in my call to glOrthof()? which one?</li> </ul>

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