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This adds the following new functions to apply a rotation described by a euler or a quaternion to either a CoglMatrix or directly to the modelview stack of a framebuffer: cogl_matrix_rotate_quaternion cogl_matrix_rotate_euler cogl_framebuffer_rotate_quaternion cogl_framebuffer_rotate_euler The direct framebuffer functions have corresponding functions in the CoglMatrixStack to store an entry describing the rotation. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 5064315678b496395e1d01f266f322d73e55e324)