Trying to optimize a rotation shader

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Originally Posted by Pixelthief

I'd guess that at least 50% of all sin/cos calls to the GPU are for integers.

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Their parameter is in radians, I would think nearly no calls are going to be integers.

Very few shaders use sin/cos because it's more flexible to calculate a transform matrix cpu-side and pass that to the shader, so I wouldn't be surprised if sin/cos weren't very optimised.

Sorry to Jump in the middle, but it is true sin and cos are not very efficient function.

i drop this link that have very useful asm function

ftp://ftp.analog.com/pub/dsp/210xx/code_examples/apps_handbook_v1/function.zip

them give you a very good idea how to be implemented in asm.


Regards