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read a texture with directx 10 in c++

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i want to read in a perlin noise map  or height map , but  in the c++ side of directx

 

and  use the information in the map , to initilise particles,

 

so  i would read in map

 

width , height

 

 

for ( int width = 0 ; i < maxWidth ; i++)

{

     for ( int height= 0 ; j < maxhieght ; j++)

     {

         if ( texture[i][j].alphaAmount >0.5)

               CreateParticle(i,j);

      }

 

}

 

 

this is what i want to do , but cant see any code that will allow me , to do  this 

 

what i need to know is how to read the texture in  and the correct mannor

Edited by the dodger uk

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Is the perlin noise texture updated on the gpu ?

if not, don't use a texture (calculate the noise on the fly or use a look-up array).

 

if it is updated on the gpu, use the map methond to read the content of the texture.

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