From a8b3118e8305fd1c668ea25e07157b625c9747ff Mon Sep 17 00:00:00 2001
From: Joursoir <chat@joursoir.net>
Date: Sat, 10 Apr 2021 17:29:02 +0000
Subject: add glm headers

---
 src/include/glm/gtx/color_space_YCoCg.inl | 107 ++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 src/include/glm/gtx/color_space_YCoCg.inl

(limited to 'src/include/glm/gtx/color_space_YCoCg.inl')

diff --git a/src/include/glm/gtx/color_space_YCoCg.inl b/src/include/glm/gtx/color_space_YCoCg.inl
new file mode 100644
index 0000000..7c410c1
--- /dev/null
+++ b/src/include/glm/gtx/color_space_YCoCg.inl
@@ -0,0 +1,107 @@
+/// @ref gtx_color_space_YCoCg
+
+namespace glm
+{
+	template<typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCg
+	(
+		vec<3, T, Q> const& rgbColor
+	)
+	{
+		vec<3, T, Q> result;
+		result.x/*Y */ =   rgbColor.r / T(4) + rgbColor.g / T(2) + rgbColor.b / T(4);
+		result.y/*Co*/ =   rgbColor.r / T(2) + rgbColor.g * T(0) - rgbColor.b / T(2);
+		result.z/*Cg*/ = - rgbColor.r / T(4) + rgbColor.g / T(2) - rgbColor.b / T(4);
+		return result;
+	}
+
+	template<typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCg2rgb
+	(
+		vec<3, T, Q> const& YCoCgColor
+	)
+	{
+		vec<3, T, Q> result;
+		result.r = YCoCgColor.x + YCoCgColor.y - YCoCgColor.z;
+		result.g = YCoCgColor.x				   + YCoCgColor.z;
+		result.b = YCoCgColor.x - YCoCgColor.y - YCoCgColor.z;
+		return result;
+	}
+
+	template<typename T, qualifier Q, bool isInteger>
+	class compute_YCoCgR {
+	public:
+		static GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCgR
+		(
+			vec<3, T, Q> const& rgbColor
+		)
+		{
+			vec<3, T, Q> result;
+			result.x/*Y */ = rgbColor.g * static_cast<T>(0.5) + (rgbColor.r + rgbColor.b) * static_cast<T>(0.25);
+			result.y/*Co*/ = rgbColor.r - rgbColor.b;
+			result.z/*Cg*/ = rgbColor.g - (rgbColor.r + rgbColor.b) * static_cast<T>(0.5);
+			return result;
+		}
+
+		static GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCgR2rgb
+		(
+			vec<3, T, Q> const& YCoCgRColor
+		)
+		{
+			vec<3, T, Q> result;
+			T tmp = YCoCgRColor.x - (YCoCgRColor.z * static_cast<T>(0.5));
+			result.g = YCoCgRColor.z + tmp;
+			result.b = tmp - (YCoCgRColor.y * static_cast<T>(0.5));
+			result.r = result.b + YCoCgRColor.y;
+			return result;
+		}
+	};
+
+	template<typename T, qualifier Q>
+	class compute_YCoCgR<T, Q, true> {
+	public:
+		static GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCgR
+		(
+			vec<3, T, Q> const& rgbColor
+		)
+		{
+			vec<3, T, Q> result;
+			result.y/*Co*/ = rgbColor.r - rgbColor.b;
+			T tmp = rgbColor.b + (result.y >> 1);
+			result.z/*Cg*/ = rgbColor.g - tmp;
+			result.x/*Y */ = tmp + (result.z >> 1);
+			return result;
+		}
+
+		static GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCgR2rgb
+		(
+			vec<3, T, Q> const& YCoCgRColor
+		)
+		{
+			vec<3, T, Q> result;
+			T tmp = YCoCgRColor.x - (YCoCgRColor.z >> 1);
+			result.g = YCoCgRColor.z + tmp;
+			result.b = tmp - (YCoCgRColor.y >> 1);
+			result.r = result.b + YCoCgRColor.y;
+			return result;
+		}
+	};
+
+	template<typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<3, T, Q> rgb2YCoCgR
+	(
+		vec<3, T, Q> const& rgbColor
+	)
+	{
+		return compute_YCoCgR<T, Q, std::numeric_limits<T>::is_integer>::rgb2YCoCgR(rgbColor);
+	}
+
+	template<typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<3, T, Q> YCoCgR2rgb
+	(
+		vec<3, T, Q> const& YCoCgRColor
+	)
+	{
+		return compute_YCoCgR<T, Q, std::numeric_limits<T>::is_integer>::YCoCgR2rgb(YCoCgRColor);
+	}
+}//namespace glm
-- 
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