WCudaMSE/Student_Cuda_Image/src/cpp/core/00_Rippling_warmup/03_math/Rippling0Math.h

   1 #ifndef RIPPLING_0_MATH_H_
   2 #define RIPPLING_0_MATH_H_
   3
   4 #include <cmath>
   5 #include "MathTools.h"
   6
   7 /*----------------------------------------------------------------------*\
   8  |*                     Declaration                                     *|
   9  \*---------------------------------------------------------------------*/
  10
  11 /*--------------------------------------*\
  12  |*             Public                  *|
  13  \*-------------------------------------*/
  14
  15 class Rippling0Math
  16     {
  17
  18         /*--------------------------------------*\
  19         |*              Constructor             *|
  20          \*-------------------------------------*/
  21
  22     public:
  23
  24         __device__
  25         Rippling0Math(int w, int h)
  26             : dim2(w / 2.0)
  27             {
  28             }
  29
  30         /*--------------------------------------*\
  31         |*              Methodes                *|
  32          \*-------------------------------------*/
  33
  34     public:
  35
  36         /**
  37          * x=pixelI
  38          * y=pixelJ
  39          */
  40         __device__
  41         void color(int i, int j, float t, uchar4* ptrColor)
  42             {
  43             const double dxy10 = dxy(j, i) / 10.0;
  44             const double grayLevelFloat = 128.0 + 127.0 * cos(dxy10 - 100.0 * t / 7.0) / (dxy10 + 1);
  45             const uchar grayLevel = (uchar)(long(grayLevelFloat) % 256);
  46
  47             ptrColor->x = grayLevel;
  48             ptrColor->y = grayLevel;
  49             ptrColor->z = grayLevel;
  50             }
  51
  52     private:
  53         __device__
  54         double dxy(int x, int y)
  55             {
  56             return sqrt(pow(x - this->dim2, 2.0) + pow(y - this->dim2, 2.0));
  57             }
  58
  59         /*--------------------------------------*\
  60         |*              Attributs               *|
  61          \*-------------------------------------*/
  62
  63     private:
  64         const double dim2;
  65
  66     };
  67
  68 #endif
  69
  70 /*----------------------------------------------------------------------*\
  71  |*                     End                                             *|
  72  \*---------------------------------------------------------------------*/