Added new example: text_font_sdf

1 files changed, 123 insertions, 0 deletions

diff --git a/examples/text/text_font_sdf.c b/examples/text/text_font_sdf.c
new file mode 100644
index 00000000..5f7ad5fa
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+++ b/examples/text/text_font_sdf.c
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+/*******************************************************************************************
+*
+*   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)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+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)
+    
+    const char msg[50] = "Signed Distance Fields";
+
+    // Default font generation from TTF font
+    Font fontDefault = { 0 };
+    fontDefault.baseSize = 16;
+    fontDefault.charsCount = 95;
+    // Parameters > font size: 16, no chars array provided (0), chars count: 95 (autogenerate chars array)
+    fontDefault.chars = LoadFontData("resources/AnonymousPro-Bold.ttf", 16, 0, 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 = { 0 };
+    fontSDF.baseSize = 16;
+    fontSDF.charsCount = 95;
+    // Parameters > font size: 16, no chars array provided (0), chars count: 0 (defaults to 95)
+    fontSDF.chars = LoadFontData("resources/AnonymousPro-Bold.ttf", 16, 0, 0, true);
+    // Parameters > chars count: 95, font size: 16, chars padding in image: 0 px, pack method: 1 (Skyline algorythm)
+    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(0, "resources/shaders/sdf.fs");
+    SetTextureFilter(fontSDF.texture, FILTER_BILINEAR);    // Required for SDF font
+
+    Vector2 fontPosition = { 40, screenHeight/2 - 50 };
+    Vector2 textSize = { 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);
+            }
+
+            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;
+}
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