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lomateron

Problem hlsl code

7 posts in this topic

[source lang="java"]this works

u = uint3(2,0, 0);
r = Du.Load(u);

this doesnt works

u = uint3(Cordd(2.0f), 0); //---Cordd(2.0f) return uint2(2,0)
r = Du.Load(u);

uint2 Cordd(float a)
{
uint2 r;
r.x=uint(a%3.0f);
r.y=uint(a/3.0f);
return r;
}[/source]
In the complete method i return 'r' as a SV_Target, when i use the one that works the pixel is replaced by the values that 'r' has and when i use the one that doesnt the pixel mantains the same.
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The modulo operator doesn't work as you think it does on floating-point numbers. See [url="http://msdn.microsoft.com/en-us/library/windows/desktop/bb509631(v=vs.85).aspx#Additive_and_Multiplicative_Operators"]this link[/url], down to the floating-point modulo section.

Basically, what it does is it divides the two operands and returns the fractional part (which is always between 0 inclusive and 1 inclusive). In your case, since you are converting that to an int after, you will always get zero no matter what. Using your example, you will get 2.0f % 3.0f = Frac(2.0f / 3.0f) = Frac(0.666..) = 0.666... Truncated down to an integer, you get zero. Not two.

You want to use [url="http://msdn.microsoft.com/en-us/library/windows/desktop/bb509601(v=vs.85).aspx"]fmod[/url] instead, probably. Or work in sufficiently large integers instead of floating-point numbers. Edited by Bacterius
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thanks i have been 1 complete day in this problem.
Cord() method didnt returned me 0.666 and 'r' was getting the value that i expected in the end of the method but in the end the pixel wasnt getting it, so it was impossible to me to get that mistake.
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WAIT! its still not working, and the the module operator % is working like fmod() so it was the same thing,i am always sure that the float that enters the Cordd() method nevr has decimals. What else can cause this problem Edited by lomateron
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but r.x is an uint how can i add frac(a) to it.....
YESSS!!! it fianlly worked I used
(uint(a) % 3)
the thing was that 3 wasnt really 3 but another float variable so i used
(uint(a) % uint(f))
and it worked Edited by lomateron
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Oh yes, my bad. Note this won't work if your modulus is a fractional number like 2.5f or somesuch, but most of the time you are just trying to wrap a float around some integer. Though, note if you're only going to use the arguments as integers, you may as well pass them as integers.

Unsure why fmod didn't work, it should have. How did you use it?
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just
r.x=uint(fmod(a,f));
and it didnt work, using fmod() or %, Cordd() returned the correct value uint(2, 0)
I still dont know why in the end they dont work, the pixel was not change.
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