/**
* Builds a new GLTexture
*
* @param format The texture format
* @param dim The texture size, or null for the default
* @param mipmap Whether to mipmap or not
*/
private GLTexture(Format format, ReadableDimension dim, boolean mipmap, int border)
throws OpenGLException {
this.format = format;
size =
dim != null
? new Dimension(
GLUtil.nextPowerOf2(dim.getWidth()), GLUtil.nextPowerOf2(dim.getHeight()))
: new Dimension(textureDimension, textureDimension);
this.mipmap = mipmap;
packer = new RectanglePacker<Image>(size.getWidth(), size.getHeight(), border);
recreate();
}
private void writeToTexture(RectanglePacker.Rectangle r, ByteBuffer data) {
assert r.width * r.height * format.bytes == data.capacity()
: r + " * " + format.bytes + " != " + data.capacity();
GL11.glBindTexture(GL11.GL_TEXTURE_2D, id);
GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, format.bytes);
GL11.glTexSubImage2D(
GL11.GL_TEXTURE_2D,
0,
r.x,
r.y,
r.width,
r.height,
format.glFormat,
GL11.GL_UNSIGNED_BYTE,
data);
GLUtil.checkGLError();
if (mipmap) {
mipmapDirty = true;
}
}
private void recreate() {
id = GL11.glGenTextures();
GL11.glBindTexture(GL11.GL_TEXTURE_2D, id);
GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, format.bytes);
ByteBuffer data =
BufferUtils.createByteBuffer(size.getWidth() * size.getHeight() * format.bytes);
if (mipmap) {
GLU.gluBuild2DMipmaps(
GL11.GL_TEXTURE_2D,
format.glInternalFormat,
size.getWidth(),
size.getHeight(),
format.glFormat,
GL11.GL_UNSIGNED_BYTE,
data);
} else {
GL11.glTexImage2D(
GL11.GL_TEXTURE_2D,
0,
format.glInternalFormat,
size.getWidth(),
size.getHeight(),
0,
format.glFormat,
GL11.GL_UNSIGNED_BYTE,
data);
}
GLUtil.checkGLError();
for (Texture t : residentTextures) {
RectanglePacker.Rectangle rpr = packer.findRectangle(t.getSourceImage());
if (rpr != null) {
writeToTexture(rpr, t.getSourceImage().getData());
}
}
regenerateMipmaps();
}
