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Old 10-11-07, 09:58 AM   #1
PrakashP
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Default shader precision

I am playing around with GLSL fragment shaders on my onboard 6150 and am wondering why they are much less precise than SSE? Both use 32bit floating points, but SSE is magnitudes more precise in my test with naive matrix multiplication. As far as I understood the GPU doesn't have eg. denorms support, but would this make such a difference?

I'd be happy for an explanation.
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Old 10-11-07, 10:08 AM   #2
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Default Re: shader precision

I would recommend you to read the GLSL specs on what floating point format is used. That can easily explain the difference.
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Old 10-11-07, 10:14 AM   #3
PrakashP
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Default Re: shader precision

Well, in case I haven't made it clear, I used FP32. Using FP16 is way worse - as expected.
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