From 565ab686822e027bc9244591befe449c5b515fc2 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Mon, 16 May 2022 23:23:50 +0300
Subject: [PATCH] Add gfx::to_srgb/to_linear for colors

---
 libs/gfx/include/psemek/gfx/color.hpp | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/libs/gfx/include/psemek/gfx/color.hpp b/libs/gfx/include/psemek/gfx/color.hpp
index 5ff8507c..2233c1df 100644
--- a/libs/gfx/include/psemek/gfx/color.hpp
+++ b/libs/gfx/include/psemek/gfx/color.hpp
@@ -75,6 +75,33 @@ namespace psemek::gfx
 		return to_coloru8(geom::lerp(to_colorf(c0), to_colorf(c1), t));
 	}
 
+	template <std::size_t N>
+	auto to_srgb(geom::vector<float, N> const & c, float g = 1.f / 2.2f)
+	{
+		geom::vector<float, N> r = c;
+		for (std::size_t i = 0; i < std::min<std::size_t>(3, N); ++i)
+			r[i] = std::pow(r[i], g);
+		return r;
+	}
+
+	template <std::size_t N>
+	auto to_srgb(geom::vector<std::uint8_t, N> const & c, float g = 1.f / 2.2f)
+	{
+		return to_coloru8(to_srgb(to_colorf(c), g));
+	}
+
+	template <std::size_t N>
+	auto to_srgb(geom::vector<std::uint16_t, N> const & c, float g = 1.f / 2.2f)
+	{
+		return to_coloru16(to_srgb(to_colorf(c), g));
+	}
+
+	template <typename T, std::size_t N>
+	auto to_linear(geom::vector<T, N> const & c, float g = 1.f / 2.2f)
+	{
+		return to_srgb(c, 1.f / g);
+	}
+
 	struct generic_color
 	{
 		color_4f c;