GL rendering without a window

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Original post by Arex Or you probably don't even need to create the FBO, just hide the window and read the data from your default framebuffer. :)

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Original post by V-man There is no such thing as GL rendering without a window.

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Original post by Brother Bob Quote: Original post by V-man There is no such thing as GL rendering without a window. There certainly is such a thing. For example, Mesa provides the OSMesa driver which can render to a user defined memory buffer, without a window, or any windowing code at all. Perfect for rendering intended for a purpose other than displaying on the screen in one way or another. For example, I made an experimetal application on my webserver that used Mesa and OSMesa to render an image dynamically with parameters set by submitted data and sent it back to the browser as an encoded image. However, I doubt the Mesa/OSMesa solution is possible in the environment required by personwholives.

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Original post by V-man I'm sure he is running Windows but let's consider Linux. Is OSMesa hw accelerated on Linux?

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Original post by V-man The only thing I know is that if I install Linux, Mesa comes with it. usually version 1.2. I don't know if it is Mesa 1.2 or GL 1.2 but it runs in software so I have to install drivers.

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Original post by personwholives I am trying to create an opengl app which renders entirely to offscreen buffers and drops those buffers to textures. This part is easy, however, I can't seem to come up with a way to do this without a window. Does anyone know any way to do this? A second (and worse, IMO) issue, is that I have to do this in java, so I am working with JOGL. Whatever the trick, I need it to work with JOGL. Any thoughts? Thanks in advance.

GLPbuffer pBuffer;if( GLDrawableFactory.getFactory().canCreateGLPbuffer() ) {    pBuffer = GLDrawableFactory.getFactory().createGLPbuffer(glcaps,         null, texWidth, texHeight, null);    pBuffer.addGLEventListener(this);	} else {    System.out.println("The graphics card has no pbuffer support.");}// start rendering into the pBufferpBuffer.display();GL gl = pBuffer.getContext().getGL();gl.glFinish();pBuffer.getContext().destroy();

ByteBuffer result = ...;gl.glReadPixels(0, 0, width, height, GL_RGBA, GL_FLOAT, result);