Update/merge examples back into main repo (#192)

Examples/Text/CodepointsLoading.cs

@@ -0,0 +1,132 @@
+/*******************************************************************************************
+*
+*   raylib [text] example - Codepoints loading
+*
+*   Example originally created with raylib 4.2, last time updated with raylib 2.5
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2022-2023 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using System.Numerics;
+using System.Linq;
+using System.Globalization;
+using System.Collections.Generic;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Text;
+
+class CodepointsLoading
+{
+    public unsafe static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        const int screenWidth = 800;
+        const int screenHeight = 450;
+
+        InitWindow(screenWidth, screenHeight, "raylib [text] example - codepoints loading");
+
+        // Text to be displayed, must be UTF-8 (save this code file as UTF-8)
+        // NOTE: It can contain all the required text for the game,
+        // this text will be scanned to get all the required codepoints
+        const string text =
+            "いろはにほへと　ちりぬるを\nわかよたれそ　つねならむ\nうゐのおくやま　けふこえて\nあさきゆめみし　ゑひもせす";
+
+        // Get codepoints from text
+        List<int> codepoints = GetCodePoints(text);
+
+        // Remove duplicate codepoints to generate smaller font atlas
+        int[] codepointsNoDuplicates = codepoints.Distinct().ToArray();
+
+        // Load font containing all the provided codepoint glyphs
+        // A texture font atlas is automatically generated
+        Font font = LoadFontEx(
+            "resources/DotGothic16-Regular.ttf",
+            36,
+            codepointsNoDuplicates,
+            codepointsNoDuplicates.Length
+        );
+
+        // Set bilinear scale filter for better font scaling
+        SetTextureFilter(font.Texture, TextureFilter.TEXTURE_FILTER_BILINEAR);
+
+        bool showFontAtlas = false;
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        // Main game loop
+        while (!WindowShouldClose())
+        {
+            // Update
+            //----------------------------------------------------------------------------------
+            if (IsKeyPressed(KeyboardKey.KEY_SPACE))
+            {
+                showFontAtlas = !showFontAtlas;
+            }
+            //----------------------------------------------------------------------------------
+
+            // Draw
+            //----------------------------------------------------------------------------------
+            BeginDrawing();
+
+            ClearBackground(Color.RAYWHITE);
+
+            DrawRectangle(0, 0, GetScreenWidth(), 70, Color.BLACK);
+            DrawText($"Total codepoints contained in provided text: {codepoints.Count}", 10, 10, 20, Color.GREEN);
+            DrawText(
+                $"Total codepoints required for font atlas (duplicates excluded): {codepointsNoDuplicates.Length}",
+                10,
+                40,
+                20,
+                Color.GREEN
+            );
+
+            if (showFontAtlas)
+            {
+                // Draw generated font texture atlas containing provided codepoints
+                DrawTexture(font.Texture, 150, 100, Color.BLACK);
+                DrawRectangleLines(150, 100, font.Texture.Width, font.Texture.Height, Color.BLACK);
+            }
+            else
+            {
+                // Draw provided text with laoded font, containing all required codepoint glyphs
+                DrawTextEx(font, text, new Vector2(160, 110), 48, 5, Color.BLACK);
+            }
+
+            DrawText("Press SPACE to toggle font atlas view!", 10, GetScreenHeight() - 30, 20, Color.GRAY);
+
+            EndDrawing();
+            //----------------------------------------------------------------------------------
+        }
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        UnloadFont(font);
+
+        CloseWindow();
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+
+    private static List<int> GetCodePoints(string text)
+    {
+        List<int> codePoints = new();
+
+        StringInfo stringInfo = new(text);
+        TextElementEnumerator enumerator = StringInfo.GetTextElementEnumerator(text);
+
+        while (enumerator.MoveNext())
+        {
+            int codePoint = char.ConvertToUtf32(enumerator.Current.ToString(), 0);
+            codePoints.Add(codePoint);
+        }
+
+        return codePoints;
+    }
+}