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Thanks LB,

Internally, on the CPU side, Fragmentarium use double precision floats, but they are sent to the GPU in single-precision. (The Qt OpenGL wrapper does not support double-precision uniforms. The OpenGL API does, but I cannot test this since, since my GPU is not OpenGL 4.0 capable).

There is really no need to change the camera representation, though. The camera information is sent to the GPU as a center point, and a zoom factor. And the fractal calculation becomes unstable long before the single-precision limits of the zoom value is reached (a (normalised) SP float ranges from 10^-38 to 10^38 - and the Mandelbrot example breaks down already at zoom-factors of 10^14 for double precision calculations). Just make sure that the actual pixel coordinates are calculated using double precision.