working version of glyphs rendering with example

openVulkanoCpp/Scene/Text.cpp

@@ -0,0 +1,48 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include "Text.hpp"
+#include "fmt/core.h"
+#include "msdfgen.h"
+#include "msdfgen-ext.h"
+#include "msdf-atlas-gen/msdf-atlas-gen.h"
+
+namespace OpenVulkano::Scene
+{
+	using namespace msdfgen;
+	using namespace msdf_atlas;
+
+	void Text::Init(const std::string_view fontFile, char8_t symbol, const std::string_view outputFile)
+	{
+		FreetypeHandle *ft = initializeFreetype();
+		if (!ft)
+		{
+			throw std::runtime_error("Failed to initialize freetype");
+		}
+		FontHandle *font = loadFont(ft, fontFile.data());
+		if (!font)
+		{
+			deinitializeFreetype(ft);
+			throw std::runtime_error(fmt::format("Failed to load font freetype from file {0}", fontFile.data()));
+		}
+
+		Shape shape;
+		if (loadGlyph(shape, font, symbol, FONT_SCALING_EM_NORMALIZED))
+		{
+			shape.normalize();
+			Bitmap<float, 1> sdf(m_cfg.outputSize, m_cfg.outputSize);
+			// scale, translation (in em's)
+			Projection proj(m_cfg.outputSize, Vector2(0.125, 0.125));
+			// distance mapping
+			Range rng(0.075);
+			SDFTransformation t(proj, rng);
+			generateSDF(sdf, shape, t);
+			savePng(sdf, outputFile.data());
+		}
+		destroyFont(font);
+		deinitializeFreetype(ft);
+	}
+}