RENAMED: text_ttf_loading > text_font_filters

examples/text/text_font_filters.c

@@ -0,0 +1,134 @@
+/*******************************************************************************************
+*
+*   raylib [text] example - Font filters
+*
+*   After font loading, font texture atlas filter could be configured for a softer
+*   display of the font when scaling it to different sizes, that way, it's not required
+*   to generate multiple fonts at multiple sizes (as long as the scaling is not very different)
+*
+*   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(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [text] example - font filters");
+
+    const char msg[50] = "Loaded Font";
+
+    // NOTE: Textures/Fonts MUST be loaded after Window initialization (OpenGL context is required)
+
+    // TTF Font loading with custom generation parameters
+    Font font = LoadFontEx("resources/KAISG.ttf", 96, 0, 0);
+
+    // Generate mipmap levels to use trilinear filtering
+    // NOTE: On 2D drawing it won't be noticeable, it looks like FILTER_BILINEAR
+    GenTextureMipmaps(&font.texture);
+
+    float fontSize = font.baseSize;
+    Vector2 fontPosition = { 40, screenHeight/2 - 80 };
+    Vector2 textSize = { 0.0f, 0.0f };
+
+    // Setup texture scaling filter
+    SetTextureFilter(font.texture, FILTER_POINT);
+    int currentFontFilter = 0;      // FILTER_POINT
+
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        fontSize += GetMouseWheelMove()*4.0f;
+
+        // Choose font texture filter method
+        if (IsKeyPressed(KEY_ONE))
+        {
+            SetTextureFilter(font.texture, FILTER_POINT);
+            currentFontFilter = 0;
+        }
+        else if (IsKeyPressed(KEY_TWO))
+        {
+            SetTextureFilter(font.texture, FILTER_BILINEAR);
+            currentFontFilter = 1;
+        }
+        else if (IsKeyPressed(KEY_THREE))
+        {
+            // NOTE: Trilinear filter won't be noticed on 2D drawing
+            SetTextureFilter(font.texture, FILTER_TRILINEAR);
+            currentFontFilter = 2;
+        }
+
+        textSize = MeasureTextEx(font, msg, fontSize, 0);
+
+        if (IsKeyDown(KEY_LEFT)) fontPosition.x -= 10;
+        else if (IsKeyDown(KEY_RIGHT)) fontPosition.x += 10;
+
+        // Load a dropped TTF file dynamically (at current fontSize)
+        if (IsFileDropped())
+        {
+            int count = 0;
+            char **droppedFiles = GetDroppedFiles(&count);
+
+            // NOTE: We only support first ttf file dropped
+            if (IsFileExtension(droppedFiles[0], ".ttf"))
+            {
+                UnloadFont(font);
+                font = LoadFontEx(droppedFiles[0], fontSize, 0, 0);
+                ClearDroppedFiles();
+            }
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            DrawText("Use mouse wheel to change font size", 20, 20, 10, GRAY);
+            DrawText("Use KEY_RIGHT and KEY_LEFT to move text", 20, 40, 10, GRAY);
+            DrawText("Use 1, 2, 3 to change texture filter", 20, 60, 10, GRAY);
+            DrawText("Drop a new TTF font for dynamic loading", 20, 80, 10, DARKGRAY);
+
+            DrawTextEx(font, msg, fontPosition, fontSize, 0, BLACK);
+
+            // TODO: It seems texSize measurement is not accurate due to chars offsets...
+            //DrawRectangleLines(fontPosition.x, fontPosition.y, textSize.x, textSize.y, RED);
+
+            DrawRectangle(0, screenHeight - 80, screenWidth, 80, LIGHTGRAY);
+            DrawText(FormatText("Font size: %02.02f", fontSize), 20, screenHeight - 50, 10, DARKGRAY);
+            DrawText(FormatText("Text size: [%02.02f, %02.02f]", textSize.x, textSize.y), 20, screenHeight - 30, 10, DARKGRAY);
+            DrawText("CURRENT TEXTURE FILTER:", 250, 400, 20, GRAY);
+
+            if (currentFontFilter == 0) DrawText("POINT", 570, 400, 20, BLACK);
+            else if (currentFontFilter == 1) DrawText("BILINEAR", 570, 400, 20, BLACK);
+            else if (currentFontFilter == 2) DrawText("TRILINEAR", 570, 400, 20, BLACK);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    ClearDroppedFiles();        // Clear internal buffers
+
+    UnloadFont(font);           // Font unloading
+
+    CloseWindow();              // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}