QGLWidget offscreen rendering and GL_MAX_TEXTURE_SIZE

  • Dear Qt-ers,
    I wrote a small application displaying an heightmap with a texture and I would like to export a snapshot bigger than my screen.
    I found the convenient QGLWidget::renderPixmap() but unfortunately it renders the scene with a "virtual" OpenGL1.1 device that has a limit of 1024x1024 for the texture size (GL_MAX_TEXTURE_SIZE).
    As expected, it works fine for small texture, but above the 1024² limit, the heightmap is not textured.

    Do I have alternative to achieve my "high-res" capture of the scene?

    Thanks a lot

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