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    <p>So... in the end I did what other people had to do and wrote my own version of GLKBaseEffect. </p> <p>It's fiddly but it's not THAT hard, took about a day. There are tutorials out there but none offered exactly what I needed. In the end I used the OGL default project as my starting point as that gave me the framework - compiling and running shaders and all that, even though it wasn't doing what I wanted. </p> <p>Here is the gist of what I did. It took a lot of iterations to get working...</p> <ol> <li>Remove all GLKBaseEffect from the default OGL project (one cube is drawn with GLKBaseEffect but the other is with shaders)</li> <li>Change projection Matrix to be GLKMatrix4MakeOrtho.</li> <li>Change vertices from Cube to 2D. Get it working.</li> <li>Add textures.</li> <li>Get it all working.</li> <li>Move all OGL code into an OpenGLHelper Class.</li> <li>Move code into my project and replace all GLKEffects with my new class</li> </ol> <p>The end result may not be the best code, but it works, and there are no leaks any more.</p> <p>Here are my shaders </p> <pre><code>// FRAGMENT SHADER ////////////// precision mediump float; varying lowp vec2 texCoordOut; uniform sampler2D textureUniform; uniform float alphaUniform; uniform lowp vec4 colorUniform; void main() { vec4 color = colorUniform * texture2D(textureUniform, texCoordOut); ; gl_FragColor = color; } // VERTEX SHADER //////////////////// attribute vec4 position; uniform mat4 projection; uniform mat4 modelView; attribute vec2 texCoordIn; varying vec2 texCoordOut; void main() { gl_Position = projection * modelView * position; texCoordOut = texCoordIn; } </code></pre> <p>I'd happily share the rest of the code but there's a bit much of it to put in here!</p>
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    1. COhello David, I'd like to follow the path you've taken, but it seems to me that the XCode's OpenGL default project uses `GLKBaseEffect` as well. Am I missing something? Are you willing to share your sources?
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    2. COsorry, just saw your comment that one of the cubes in the OGL default project is rendered without `GLKBaseEffect`. Thank you!
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    3. COHope that worked out for you. I'd be happy to share more of my code if it helps though I know it isn't perfect!
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