1 files changed, 141 insertions, 0 deletions
diff --git a/external/include/glm/gtx/color_space.inl b/external/include/glm/gtx/color_space.inl
new file mode 100644
index 0000000..e7cd58d
--- /dev/null
+++ b/external/include/glm/gtx/color_space.inl
@@ -0,0 +1,141 @@
+/// @ref gtx_color_space
+/// @file glm/gtx/color_space.inl
+
+namespace glm
+{
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER tvec3<T, P> rgbColor(const tvec3<T, P>& hsvColor)
+	{
+		tvec3<T, P> hsv = hsvColor;
+		tvec3<T, P> rgbColor;
+
+		if(hsv.y == static_cast<T>(0))
+			// achromatic (grey)
+			rgbColor = tvec3<T, P>(hsv.z);
+		else
+		{
+			T sector = floor(hsv.x / T(60));
+			T frac = (hsv.x / T(60)) - sector;
+			// factorial part of h
+			T o = hsv.z * (T(1) - hsv.y);
+			T p = hsv.z * (T(1) - hsv.y * frac);
+			T q = hsv.z * (T(1) - hsv.y * (T(1) - frac));
+
+			switch(int(sector))
+			{
+			default:
+			case 0:
+				rgbColor.r = hsv.z;
+				rgbColor.g = q;
+				rgbColor.b = o;
+				break;
+			case 1:
+				rgbColor.r = p;
+				rgbColor.g = hsv.z;
+				rgbColor.b = o;
+				break;
+			case 2:
+				rgbColor.r = o;
+				rgbColor.g = hsv.z;
+				rgbColor.b = q;
+				break;
+			case 3:
+				rgbColor.r = o;
+				rgbColor.g = p;
+				rgbColor.b = hsv.z;
+				break;
+			case 4:
+				rgbColor.r = q; 
+				rgbColor.g = o; 
+				rgbColor.b = hsv.z;
+				break;
+			case 5:
+				rgbColor.r = hsv.z; 
+				rgbColor.g = o; 
+				rgbColor.b = p;
+				break;
+			}
+		}
+
+		return rgbColor;
+	}
+
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER tvec3<T, P> hsvColor(const tvec3<T, P>& rgbColor)
+	{
+		tvec3<T, P> hsv = rgbColor;
+		float Min   = min(min(rgbColor.r, rgbColor.g), rgbColor.b);
+		float Max   = max(max(rgbColor.r, rgbColor.g), rgbColor.b);
+		float Delta = Max - Min;
+
+		hsv.z = Max;                               
+
+		if(Max != static_cast<T>(0))
+		{
+			hsv.y = Delta / hsv.z;    
+			T h = static_cast<T>(0);
+
+			if(rgbColor.r == Max)
+				// between yellow & magenta
+				h = static_cast<T>(0) + T(60) * (rgbColor.g - rgbColor.b) / Delta;
+			else if(rgbColor.g == Max)
+				// between cyan & yellow
+				h = static_cast<T>(120) + T(60) * (rgbColor.b - rgbColor.r) / Delta;
+			else
+				// between magenta & cyan
+				h = static_cast<T>(240) + T(60) * (rgbColor.r - rgbColor.g) / Delta;
+
+			if(h < T(0)) 
+				hsv.x = h + T(360);
+			else
+				hsv.x = h;
+		}
+		else
+		{
+			// If r = g = b = 0 then s = 0, h is undefined
+			hsv.y = static_cast<T>(0);
+			hsv.x = static_cast<T>(0);
+		}
+
+		return hsv;
+	}
+
+	template <typename T>
+	GLM_FUNC_QUALIFIER tmat4x4<T, defaultp> saturation(T const s)
+	{
+		tvec3<T, defaultp> rgbw = tvec3<T, defaultp>(T(0.2126), T(0.7152), T(0.0722));
+
+		tvec3<T, defaultp> const col((T(1) - s) * rgbw);
+
+		tmat4x4<T, defaultp> result(T(1));
+		result[0][0] = col.x + s;
+		result[0][1] = col.x;
+		result[0][2] = col.x;
+		result[1][0] = col.y;
+		result[1][1] = col.y + s;
+		result[1][2] = col.y;
+		result[2][0] = col.z;
+		result[2][1] = col.z;
+		result[2][2] = col.z + s;
+		return result;
+	}
+
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER tvec3<T, P> saturation(const T s, const tvec3<T, P>& color)
+	{
+		return tvec3<T, P>(saturation(s) * tvec4<T, P>(color, T(0)));
+	}
+
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER tvec4<T, P> saturation(const T s, const tvec4<T, P>& color)
+	{
+		return saturation(s) * color;
+	}
+
+	template <typename T, precision P> 
+	GLM_FUNC_QUALIFIER T luminosity(const tvec3<T, P>& color)
+	{
+		const tvec3<T, P> tmp = tvec3<T, P>(0.33, 0.59, 0.11);
+		return dot(color, tmp);
+	}
+}//namespace glm