From 32da717a55ce29d109d5a8850623f5106412f09c Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Sun, 26 Feb 2023 23:46:06 +0300
Subject: [PATCH] Add float -> normalized (un)signed 8/16-bit converters to gfx

---
 libs/gfx/include/psemek/gfx/attribs.hpp | 56 +++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/libs/gfx/include/psemek/gfx/attribs.hpp b/libs/gfx/include/psemek/gfx/attribs.hpp
index 8ae48a37..ea0c9d0a 100644
--- a/libs/gfx/include/psemek/gfx/attribs.hpp
+++ b/libs/gfx/include/psemek/gfx/attribs.hpp
@@ -445,4 +445,60 @@ namespace psemek::gfx
 		}
 	}
 
+	inline std::int8_t to_signed_8bit(float x)
+	{
+		return static_cast<std::int8_t>(geom::clamp((0.5f * x + 0.5f) * 255.f - 128.f, {-128.f, 127.f}));
+	}
+
+	inline std::uint8_t to_unsigned_8bit(float x)
+	{
+		return static_cast<std::uint8_t>(geom::clamp(x * 255.f, {0.f, 255.f}));
+	}
+
+	inline std::int16_t to_signed_16bit(float x)
+	{
+		return static_cast<std::int16_t>(geom::clamp((0.5f * x + 0.5f) * 65535.f - 32768.f, {-32768.f, 32767.f}));
+	}
+
+	inline std::uint16_t to_unsigned_16bit(float x)
+	{
+		return static_cast<std::uint16_t>(geom::clamp(x * 65535.f, {0.f, 65535.f}));
+	}
+
+	template <std::size_t D>
+	geom::vector<std::int8_t, D> to_signed_8bit(geom::vector<float, D> const & v)
+	{
+		geom::vector<std::int8_t, D> result;
+		for (std::size_t i = 0; i < D; ++i)
+			result[i] = to_signed_8bit(v[i]);
+		return result;
+	}
+
+	template <std::size_t D>
+	geom::vector<std::uint8_t, D> to_unsigned_8bit(geom::vector<float, D> const & v)
+	{
+		geom::vector<std::uint8_t, D> result;
+		for (std::size_t i = 0; i < D; ++i)
+			result[i] = to_unsigned_8bit(v[i]);
+		return result;
+	}
+
+	template <std::size_t D>
+	geom::vector<std::int16_t, D> to_signed_16bit(geom::vector<float, D> const & v)
+	{
+		geom::vector<std::int16_t, D> result;
+		for (std::size_t i = 0; i < D; ++i)
+			result[i] = to_signed_16bit(v[i]);
+		return result;
+	}
+
+	template <std::size_t D>
+	geom::vector<std::uint16_t, D> to_unsigned_16bit(geom::vector<float, D> const & v)
+	{
+		geom::vector<std::uint16_t, D> result;
+		for (std::size_t i = 0; i < D; ++i)
+			result[i] = to_unsigned_16bit(v[i]);
+		return result;
+	}
+
 }