Add Text rendering

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

CopiumEngine/ext/include/msdf-atlas-gen/size-selectors.h

@@ -0,0 +1,54 @@
+
+#pragma once
+
+namespace msdf_atlas {
+
+// The size selector classes are used to select the minimum dimensions of the atlas fitting a given constraint.
+
+/// Selects square dimensions which are also a multiple of MULTIPLE
+template <int MULTIPLE = 1>
+class SquareSizeSelector {
+
+public:
+    explicit SquareSizeSelector(int minArea = 0);
+    bool operator()(int &width, int &height) const;
+    SquareSizeSelector<MULTIPLE> & operator++();
+    SquareSizeSelector<MULTIPLE> & operator--();
+
+private:
+    int lowerBound, upperBound;
+    int current;
+
+    void updateCurrent();
+
+};
+
+/// Selects square power-of-two dimensions
+class SquarePowerOfTwoSizeSelector {
+
+public:
+    explicit SquarePowerOfTwoSizeSelector(int minArea = 0);
+    bool operator()(int &width, int &height) const;
+    SquarePowerOfTwoSizeSelector & operator++();
+    SquarePowerOfTwoSizeSelector & operator--();
+
+private:
+    int side;
+
+};
+
+/// Selects square or rectangular (2:1) power-of-two dimensions
+class PowerOfTwoSizeSelector {
+
+public:
+    explicit PowerOfTwoSizeSelector(int minArea = 0);
+    bool operator()(int &width, int &height) const;
+    PowerOfTwoSizeSelector & operator++();
+    PowerOfTwoSizeSelector & operator--();
+
+private:
+    int w, h;
+
+};
+
+}