/**
* Convert the buffered image to a texture
*
* @param bufferedImage The image to convert to a texture
* @param texture The texture to store the data into
* @return A buffer containing the data
*/
private static ByteBuffer convertImageData(BufferedImage bufferedImage, Texture texture) {
ByteBuffer imageBuffer;
WritableRaster raster;
BufferedImage texImage;
int texWidth = 2;
int texHeight = 2;
// find the closest power of 2 for the width and height
// of the produced texture
while (texWidth < bufferedImage.getWidth()) {
texWidth *= 2;
}
while (texHeight < bufferedImage.getHeight()) {
texHeight *= 2;
}
texture.setTextureHeight(texHeight);
texture.setTextureWidth(texWidth);
// create a raster that can be used by OpenGL as a source
// for a texture
if (bufferedImage.getColorModel().hasAlpha()) {
raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE, texWidth, texHeight, 4, null);
texImage =
new BufferedImage(glAlphaColorModel, raster, false, new Hashtable<Object, Object>());
} else {
raster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE, texWidth, texHeight, 3, null);
texImage = new BufferedImage(glColorModel, raster, false, new Hashtable<Object, Object>());
}
// copy the source image into the produced image
Graphics g = texImage.getGraphics();
g.setColor(new Color(0f, 0f, 0f, 0f));
g.fillRect(0, 0, texWidth, texHeight);
g.drawImage(bufferedImage, 0, 0, null);
// build a byte buffer from the temporary image
// that be used by OpenGL to produce a texture.
byte[] data = ((DataBufferByte) texImage.getRaster().getDataBuffer()).getData();
imageBuffer = ByteBuffer.allocateDirect(data.length);
imageBuffer.order(ByteOrder.nativeOrder());
imageBuffer.put(data, 0, data.length);
imageBuffer.flip();
return imageBuffer;
}
public static UIFont createGuiFont(String name, int font_size) {
Font font = load_ttf(StringUtils.concat(name, ".ttf"), font_size);
UIFont tmp = new UIFont();
tmp.font_texture = new Texture();
Graphics2D graphics = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB).createGraphics();
graphics.setFont(font);
tmp.fontMetrics = graphics.getFontMetrics();
WritableRaster raster;
BufferedImage bufferedImage;
raster =
Raster.createInterleavedRaster(
DataBuffer.TYPE_BYTE,
(int) tmp.getFontImageWidth(),
(int) tmp.getFontImageHeight(),
4,
null);
bufferedImage = new BufferedImage(glAlphaColorModel, raster, false, null);
// Draw the characters on our image
Graphics2D imageGraphics = bufferedImage.createGraphics();
imageGraphics.setRenderingHint(
RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
imageGraphics.setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
imageGraphics.setFont(font);
imageGraphics.setColor(Color.white.getAWTColor());
// draw every CHAR by line...
for (int i : key_table.keySet())
imageGraphics.drawString(
key_table.get(i), 0, (int) (tmp.fontMetrics.getMaxAscent() + (tmp.getHeight() * i)));
// Generate texture data
byte[] data = ((DataBufferByte) bufferedImage.getRaster().getDataBuffer()).getData();
ByteBuffer imageData = BufferUtils.create_byte_buffer(data.length);
imageData.order(ByteOrder.nativeOrder());
imageData.put(data, 0, data.length);
imageData.flip();
glBindTexture(GL_TEXTURE_2D, tmp.font_texture.id);
// Setup wrap mode
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RGBA8,
(int) tmp.getFontImageWidth(),
(int) tmp.getFontImageHeight(),
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
imageData);
return tmp;
}
