#include "common.h"
#include "Material.h"

namespace GtpVisibilityPreprocessor {


RgbColor
RandomColor(const float a, const float b)
{
  return RgbColor(a + Random(b),
				  a + Random(b),
				  a + Random(b));
}


Material
RandomMaterial()
{
  float a = 0.1f;
  float b = 0.9f;

  Material m;
  m.mDiffuseColor = RandomColor(a, b);

  return m;
}



RgbColor
RainbowColorMapping(const float _value)
{
  RgbColor color;

  
  float value = 4.0f*(1.0f - _value);

  if (value < 0.0f)
	value = 0.0f;
  else
	if (value > 4.0f)
	  value = 4.0f;

#define MAX_COLOR_VALUE 1.0f

  int band = (int)(value);
  
  value -= band;
  
  switch (band) {
  case 0:
	color.r = MAX_COLOR_VALUE;
	color.g = value*MAX_COLOR_VALUE;
	color.b = 0.0f;
	break;
  case 1:
	color.r = (1.0f - value)*MAX_COLOR_VALUE;;
	color.g = MAX_COLOR_VALUE;
	color.b = 0.0f;
	break;
  case 2:
	color.r = 0.0f;
	color.g = MAX_COLOR_VALUE;
	color.b = value*MAX_COLOR_VALUE;
	break;
  case 3:
	color.r = 0.0f;
	color.g = (1.0f - value)*MAX_COLOR_VALUE;;
	color.b = MAX_COLOR_VALUE;
	break;
  default:
	color.r = value*MAX_COLOR_VALUE;
	color.g = 0.0f;
	color.b = MAX_COLOR_VALUE;
	break;
  }
  return color;
}

RgbColor
GreenRedColorMap(const float value)
{
  RgbColor color;
  
#define MAX_COLOR_VALUE 1.0f
  
  color.r = MAX_COLOR_VALUE*value;
  color.g = MAX_COLOR_VALUE*(1.0f - value);
  color.b = 0.0f;
  
  return color;
}


}