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text_font_filters.c
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139 lines (111 loc) · 5.68 KB
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/*******************************************************************************************
*
* raylib [text] example - font filters
*
* Example complexity rating: [★★☆☆] 2/4
*
* NOTE: 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)
*
* Example originally created with raylib 1.3, last time updated with raylib 4.2
*
* 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) 2015-2025 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
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 = (float)font.baseSize;
Vector2 fontPosition = { 40.0f, screenHeight/2.0f - 80.0f };
Vector2 textSize = { 0.0f, 0.0f };
// Setup texture scaling filter
SetTextureFilter(font.texture, TEXTURE_FILTER_POINT);
int currentFontFilter = 0; // TEXTURE_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, TEXTURE_FILTER_POINT);
currentFontFilter = 0;
}
else if (IsKeyPressed(KEY_TWO))
{
SetTextureFilter(font.texture, TEXTURE_FILTER_BILINEAR);
currentFontFilter = 1;
}
else if (IsKeyPressed(KEY_THREE))
{
// NOTE: Trilinear filter won't be noticed on 2D drawing
SetTextureFilter(font.texture, 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())
{
FilePathList droppedFiles = LoadDroppedFiles();
// NOTE: We only support first ttf file dropped
if (IsFileExtension(droppedFiles.paths[0], ".ttf"))
{
UnloadFont(font);
font = LoadFontEx(droppedFiles.paths[0], (int)fontSize, 0, 0);
}
UnloadDroppedFiles(droppedFiles); // Unload filepaths from memory
}
//----------------------------------------------------------------------------------
// 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(TextFormat("Font size: %02.02f", fontSize), 20, screenHeight - 50, 10, DARKGRAY);
DrawText(TextFormat("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
//--------------------------------------------------------------------------------------
UnloadFont(font); // Font unloading
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}