Raytrace-Engine-for-Computer-Graphics/CubeMap.cpp at main · egdose/Raytrace-Engine-for-Computer-Graphics · GitHub

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#include "CubeMap.h"
#include <string>
CubeMap::CubeMap(const char * directory)
{
	std::string suffix[6] = {"left","right","up","down","front","back"};
	std::string dirname(directory);
	for(int ii = 0 ;ii<6;ii++){
		std::string filename = dirname+"/";
		filename = filename+suffix[ii];
		filename = filename +".bmp";
		t[ii].load(filename.c_str());
	}
}

Vector3f CubeMap::operator()(const Vector3f & direction)
{
  Vector3f dir = direction.normalized();
  Vector3f outputColor (0.0f,0.0f,0.0f);
  if ((fabsf(dir[0]) >= fabsf(dir[1]))
      && (fabsf(dir[0]) >= fabsf(dir[2])))
  {
    if (dir[0] > 0.0f)
    {
      outputColor = t[RIGHT]((dir[2] / dir[0]+ 1.0f) * 0.5f,
        (dir[1] / dir[0]+ 1.0f) * 0.5f);
    }
    else if (dir[0] < 0.0f)
    {
      outputColor = t[LEFT]( (dir[2] / dir[0]+ 1.0f) * 0.5f,
        1.0-(dir[1] / dir[0]+ 1.0f) * 0.5f);
    }
  }
  else if ((fabsf(dir[1]) >= fabsf(dir[0])) && (fabsf(dir[1]) >= fabsf(dir[2])))
  {
    if (dir[1] > 0.0f)
    {
       outputColor = t[UP]((dir[0] / dir[1]+ 1.0f) * 0.5f,
        (dir[2] / dir[1]+ 1.0f) * 0.5f);
    }
    else if (dir[1] < 0.0f)
    {
       outputColor = t[DOWN](1.0f-(dir[0] / dir[1]+ 1.0f) * 0.5f,
        1.0f - (dir[2] / dir[1]+ 1.0f) * 0.5f);
    }
  }
  else if ((fabsf(dir[2]) >= fabsf(dir[0]))
           && (fabsf(dir[2]) >= fabsf(dir[1])))
  {
    if (dir[2] > 0.0f)
    {
        outputColor = t[FRONT](1.0f - (dir[0] / dir[2]+ 1.0f) * 0.5f,
        (dir[1] / dir[2]+ 1.0f) * 0.5f);
	}
    else if (dir[2] < 0.0f)
    {
       outputColor = t[BACK]((dir[0] / dir[2]+ 1.0f) * 0.5f,
        1.0f-(dir[1] / dir[2]+ 1.0f) * 0.5f);
    }
  }

  return outputColor;
}