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Thread: Render to texture with native API

  1. #1
    Junior Member
    Join Date
    Mar 2007
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    1

    Render to texture with native API

    Hi!

    I want to do the following:

    -> Render to a bitmap that is 512x512 pixel in size and use this bitmap as a texture in OpenGL ES without having to call glTexImage2D each time the bitmap changes.
    -> I want to access the bitmap via a pointer, so I can set the pixel by myself and I do not have to use GDI or any other 2D-API.

    I think I have to use a pixmapSurface to be able to access the buffer and eglBindTexture... But I am not able to create a pixmapSurface. Maybe because my window with its associated WindowSurface that I use for the OpenGL drawing has a different size than 512x512? But I do not want them to match...

    Thanks in advance for the help.

  2. #2
    That won't work.

    The only surfaces you can bind as textures are PBuffers, and you don't get a pointer to their surface memory.

    Infact you don't get pointers to any kind of surface memory using EGL or OpenGL/ES.

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