raylib-cs/Examples/text/text_font_sdf.cs

using Raylib;
using static Raylib.Raylib;
using static Raylib.TextureFilterMode;

public partial class text_font_sdf
{
    /*******************************************************************************************
    *
    *   raylib [text] example - TTF loading and usage
    *
    *   This example has been created using raylib 1.3.0 (www.raylib.com)
    *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
    *
    *   Copyright (c) 2015 Ramon Santamaria (@raysan5)
    *
    ********************************************************************************************/


    public static int Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        int screenWidth = 800;
        int screenHeight = 450;

        InitWindow(screenWidth, screenHeight, "raylib [text] example - SDF fonts");

        // NOTE: Textures/Fonts MUST be loaded after Window initialization (OpenGL context is required)

        string msg = "Signed Distance Fields";

        // Default font generation from TTF font
        Font fontDefault = new Font();
        fontDefault.baseSize = 16;
        fontDefault.charsCount = 95;
        // Parameters > font size: 16, no chars array provided (0), chars count: 95 (autogenerate chars array)
        // TODO: fix conversion
        //fontDefault.chars = LoadFontData("resources/AnonymousPro-Bold.ttf", 16, null, 95, false);
        // Parameters > chars count: 95, font size: 16, chars padding in image: 4 px, pack method: 0 (default)
        //Image atlas = GenImageFontAtlas(fontDefault.chars, 95, 16, 4, 0);
        //fontDefault.texture = LoadTextureFromImage(atlas);
        //UnloadImage(atlas);

        // SDF font generation from TTF font
        // NOTE: SDF chars data is generated with LoadFontData(), it's just a bool option
        Font fontSDF = new Font();
        fontSDF.baseSize = 16;
        fontSDF.charsCount = 95;
        // Parameters > font size: 16, no chars array provided (0), chars count: 0 (defaults to 95)
        // TODO: fix conversion
        //fontSDF.chars = LoadFontData("resources/AnonymousPro-Bold.ttf", 16, null, 0, true);
        // Parameters > chars count: 95, font size: 16, chars padding in image: 0 px, pack method: 1 (Skyline algorythm)
        // TODO: fix conversion
        //atlas = GenImageFontAtlas(fontSDF.chars, 95, 16, 0, 1);
        //fontSDF.texture = LoadTextureFromImage(atlas);
        //UnloadImage(atlas);

        // Load SDF required shader (we use default vertex shader)
        Shader shader = LoadShader(null, "resources/shaders/sdf.fs");
        SetTextureFilter(fontSDF.texture, (int)FILTER_BILINEAR);    // Required for SDF font

        Vector2 fontPosition = new Vector2( 40, screenHeight/2 - 50 );
        Vector2 textSize = new Vector2( 0.0f );
        float fontSize = 16.0f;
        int currentFont = 0;    // 0 - fontDefault, 1 - fontSDF

        SetTargetFPS(60);
        //--------------------------------------------------------------------------------------

        // Main game loop
        while (!WindowShouldClose())    // Detect window close button or ESC key
        {
            // Update
            //----------------------------------------------------------------------------------
            fontSize += GetMouseWheelMove()*8.0f;

            if (fontSize < 6) fontSize = 6;

            if (IsKeyDown(KEY_SPACE)) currentFont = 1;
            else currentFont = 0;

            if (currentFont == 0) textSize = MeasureTextEx(fontDefault, msg, fontSize, 0);
            else textSize = MeasureTextEx(fontSDF, msg, fontSize, 0);

            fontPosition.x = GetScreenWidth()/2 - textSize.x/2;
            fontPosition.y = GetScreenHeight()/2 - textSize.y/2 + 80;
            //----------------------------------------------------------------------------------

            // Draw
            //----------------------------------------------------------------------------------
            BeginDrawing();

                ClearBackground(RAYWHITE);

                if (currentFont == 1)
                {
                    // NOTE: SDF fonts require a custom SDf shader to compute fragment color
                    BeginShaderMode(shader);    // Activate SDF font shader
                        DrawTextEx(fontSDF, msg, fontPosition, fontSize, 0, BLACK);
                    EndShaderMode();            // Activate our default shader for next drawings

                    DrawTexture(fontSDF.texture, 10, 10, BLACK);
                }
                else
                {
                    DrawTextEx(fontDefault, msg, fontPosition, fontSize, 0, BLACK);
                    DrawTexture(fontDefault.texture, 10, 10, BLACK);
                }

                if (currentFont == 1) DrawText("SDF!", 320, 20, 80, RED);
                else DrawText("default font", 315, 40, 30, GRAY);

                DrawText("FONT SIZE: 16.0", GetScreenWidth() - 240, 20, 20, DARKGRAY);
                DrawText(FormatText("RENDER SIZE: %02.02f", fontSize), GetScreenWidth() - 240, 50, 20, DARKGRAY);
                DrawText("Use MOUSE WHEEL to SCALE TEXT!", GetScreenWidth() - 240, 90, 10, DARKGRAY);

                DrawText("PRESS SPACE to USE SDF FONT VERSION!", 340, GetScreenHeight() - 30, 20, MAROON);

            EndDrawing();
            //----------------------------------------------------------------------------------
        }

        // De-Initialization
        //--------------------------------------------------------------------------------------
        UnloadFont(fontDefault);    // Default font unloading
        UnloadFont(fontSDF);        // SDF font unloading

        UnloadShader(shader);       // Unload SDF shader

        CloseWindow();              // Close window and OpenGL context
        //--------------------------------------------------------------------------------------

        return 0;
    }
}