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    <p>Sounds like you might be a bit confused with FBO usage. If you need it, this should get you started: <a href="https://developer.apple.com/library/mac/documentation/graphicsimaging/conceptual/opengl-macprogguide/opengl_offscreen/opengl_offscreen.html" rel="nofollow noreferrer">Apple Developer - Drawing offscreen</a>. <a href="https://stackoverflow.com/questions/11236991/minimal-example-for-creating-fbo-using-opengl-es-2-0-on-ios" title="This">This</a> could help too.</p> <p>Renderbuffer is something you can bind to an FBO (framebuffer object). FBO is something you create when you don't want your rendering to be displayed immediately, but want to read the rendering result back or perform additional rendering to it. The way FBOs work in OpenGL ES 2.0, you have only one color attachment point available (GL_COLOR_ATTACHMENT0 - your fragment shader output variable gl_FragColor is connected to this attachment point), and it can only have one texture or renderbuffer attached to it. So to answer that last question, you cannot have an FBO that would simultaneously write color to a renderbuffer and a texture.</p> <p>As for the first part of your question, it depends whether you are already using an FBO or the default framebuffer. Chances are the behavior you're looking for is something like this:</p> <ol> <li>bind an FBO</li> <li>render something to a texture attached to the FBO</li> <li>bind the default framebuffer</li> <li>use the texture from step 2 to affect rendering in your second renderpass.</li> </ol> <p>Hope this answers your question even a little bit.</p>
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    1. POCan an OpenGLES 2.0 framebuffer be bound to a texture and a renderbuffer at the same time?
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    1. USArttu Peltonen
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    1. POCan an OpenGLES 2.0 framebuffer be bound to a texture and a renderbuffer at the same time?
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    1. COHmm - maybe I am confused. I have to generate and bind my framebuffer is this what you mean by default framebuffer? I can't render to the texture, and then render the texture onscreen?
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      1. USSam Ballantyne
    2. CODefault framebuffer is where you render to by default, you don't have to do anything to get that. Framebuffer _objects_ are what you can render to instead, and that's called "off-screen rendering" by some. If you do that, you end up with your image in a texture instead of the default framebuffer (that gets displayed on-screen). You _can_ copy the image from that texture to the default framebuffer (on-screen), that's usually done with blitting (but it's only available in OpenGL ES 3.0). But if you only wanted to show the image on-screen, you probably wouldn't use a FBO in the first place.
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    3. COThanks. That was super helpful.
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      1. USSam Ballantyne
 

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