private void generateFontTexture(Font font) {
Map<Character, CharImage> charImages = new HashMap<>();
int imageWidth = 0;
int imageHeight = 0;
boolean antiAlias = false;
/* Start at char #32, because ASCII 0 to 31 are just control codes */
for (int i = 32; i < 256; i++) {
if (i == 127) {
/* ASCII 127 is the DEL control code, so we can skip it */
continue;
}
char c = (char) i;
CharImage charImage = createCharImage(font, imageWidth, c, antiAlias);
if (charImage == null) {
/* If char image is null that font does not contain the char */
continue;
}
/* Create glyph and draw char on image */
charImages.put(c, charImage);
imageWidth += charImage.getWidth();
imageHeight = Math.max(imageHeight, charImage.getHeight());
}
BufferedImage image =
new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_ARGB_PRE);
Graphics2D g = image.createGraphics();
if (antiAlias) {
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
}
g.setFont(font);
g.setPaint(Color.WHITE);
/* Create BufferedImage from all character images */
for (Map.Entry<Character, CharImage> entry : charImages.entrySet()) {
CharImage charImage = entry.getValue();
Glyph glyph = charImage.getGlyph();
g.drawString(String.valueOf(entry.getKey()), glyph.getX(), charImage.getAscent());
glyphs.put(entry.getKey(), glyph);
}
g.dispose();
try (ByteArrayOutputStream os = new ByteArrayOutputStream()) {
PngEncoder encoder = new PngEncoder();
encoder.write(image, os);
int textureId = TextureUtils.loadTexture(new ByteArrayInputStream(os.toByteArray()));
fontTexture = new Texture(textureId, imageWidth, imageHeight);
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override
public void init() {
int len = text.length();
TFloatList verticles = new TFloatArrayList(12 * len);
TFloatList textCoords = new TFloatArrayList(8 * len);
TIntList indices = new TIntArrayList(6 * len);
float textureWidth = gameFont.getFontTextureWidth();
float position = 0.0f;
for (int i = 0; i < len; i++) {
Glyph glyph = gameFont.getGlyphs().get(text.charAt(i));
add(verticles, position, 0.0f, 0.0f);
add(verticles, position, glyph.getHeight(), 0.0f);
add(verticles, glyph.getWidth() + position, glyph.getHeight(), 0.0f);
add(verticles, glyph.getWidth() + position, 0.0f, 0.0f);
position += glyph.getWidth();
float textCoordX1 = glyph.getX() / textureWidth;
float textCoordX2 = (glyph.getX() + glyph.getWidth()) / textureWidth;
add(textCoords, textCoordX1, 0.0f);
add(textCoords, textCoordX1, 1.0f);
add(textCoords, textCoordX2, 1.0f);
add(textCoords, textCoordX2, 0.0f);
int firstIndice = i * 4;
indices.add(firstIndice + 0);
indices.add(firstIndice + 1);
indices.add(firstIndice + 3);
indices.add(firstIndice + 3);
indices.add(firstIndice + 1);
indices.add(firstIndice + 2);
}
mesh = new Mesh(verticles.toArray(), textCoords.toArray(), indices.toArray());
mesh.setTextureId(gameFont.getFontTextureId());
}