Float printf precision

[Stefan Dösinger]

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Hi Henri,

While overhauling  the patch to hardcode local constants in the shader
code I came across the TRACEs in wined3d_device_set_{vs,ps}_consts_f,
which print the floats with %.8e. You changed this from %f in
979e3744f7721bef9e88fd671dfd7591c9f85392.

I was curious how you ended up with 8 digits. My thinking was that 32
bit floats have a 23 bit mantissa, and one digit in the printout
encodes lb(10) bits - so you need ~6,9 digits to encode the mantissa,
which rounds up to 7. Thinking further, %.6e should do the job as
well, as there's one additional digit leading the decimal.

Is my thinking correct, or am I missing something?

Cheers,
Stefan
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