On 2011-02-02, at 10:24 AM, Benoit Jacob wrote:
Correct. On desktop GL you need EXT_framebuffer_blit + EXT_framebuffer_multisample *OR* ARB_framebuffer_object (which is basically a "roll-up" extension of the functionality which went into GL 3.0).
Chrome (when using ANGLE at least) renders to an FBO. ANGLE provides the GL_ANGLE_framebuffer_blit and GL_ANGLE_framebuffer_multisample extensions to expose the necessary FBO multisample support.
Hope this helps,