Add Text rendering

- Add FreeType as dependency
- Add MsdfGen as dependency
- Add MsdfAtlasGen as dependency

CopiumEngine/ext/include/msdf-atlas-gen/AtlasGenerator.h

@@ -0,0 +1,42 @@
+
+#pragma once
+
+#include <msdfgen.h>
+#include "Remap.h"
+#include "GlyphGeometry.h"
+
+namespace msdf_atlas {
+
+namespace {
+
+/** Prototype of an atlas generator class.
+ *  An atlas generator maintains the atlas bitmap (AtlasStorage) and its layout and facilitates
+ *  generation of bitmap representation of glyphs. The layout of the atlas is given by the caller.
+ */
+class AtlasGenerator {
+
+public:
+    AtlasGenerator();
+    AtlasGenerator(int width, int height);
+    /// Generates bitmap representation for the supplied array of glyphs
+    void generate(const GlyphGeometry *glyphs, int count);
+    /// Resizes the atlas and rearranges the generated pixels according to the remapping array
+    void rearrange(int width, int height, const Remap *remapping, int count);
+    /// Resizes the atlas and keeps the generated pixels in place
+    void resize(int width, int height);
+
+};
+
+}
+
+/// Configuration of signed distance field generator
+struct GeneratorAttributes {
+    msdfgen::MSDFGeneratorConfig config;
+    bool scanlinePass = false;
+};
+
+/// A function that generates the bitmap for a single glyph
+template <typename T, int N>
+using GeneratorFunction = void (*)(const msdfgen::BitmapRef<T, N> &, const GlyphGeometry &, const GeneratorAttributes &);
+
+}