public synchronized int getGLBuffer(GL2GL3 gl) {
// The buffer may not have been initialized yet
if (_glVertBuffer == -1) {
setupBuffer(gl);
}
if (_glBufferDirty) {
int totalVerts = 0;
for (double[] d : _vertices) {
totalVerts += d.length;
}
FloatBuffer fb = FloatBuffer.allocate(totalVerts);
for (double[] ds : _vertices) {
for (double d : ds) {
fb.put((float) d);
}
}
fb.flip();
gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, _glVertBuffer);
gl.glBufferData(GL2GL3.GL_ARRAY_BUFFER, totalVerts * 4, fb, GL2GL3.GL_STATIC_DRAW);
gl.glBindBuffer(GL2GL3.GL_ARRAY_BUFFER, 0);
_glBufferDirty = false;
}
return _glVertBuffer;
}
private void setupBuffer(GL2GL3 gl) {
// Create an OpenGL buffer
int[] buffs = new int[1];
gl.glGenBuffers(1, buffs, 0);
_glVertBuffer = buffs[0];
_glBufferDirty = true;
}