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package moe.nea.mossbar.concepts;
import manifold.ext.props.rt.api.get;
import org.freedesktop.wayland.client.WlBufferEvents;
import org.freedesktop.wayland.client.WlBufferProxy;
import org.freedesktop.wayland.client.WlShmPoolEvents;
import org.freedesktop.wayland.shared.WlShmFormat;
import org.freedesktop.wayland.util.ShmPool;
import org.jspecify.annotations.NonNull;
import org.jspecify.annotations.Nullable;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayDeque;
import java.util.Queue;
public class ShmBufferPool extends Scope {
private boolean destroyed = false;
private Queue<Buffer> ready = new ArrayDeque<>();
void enqueue(Buffer buffer) {
requireNotDestroyed();
ready.add(buffer);
}
public class Buffer extends Scope implements WlBufferEvents, WlShmPoolEvents {
private final WlBufferProxy bufferProxy;
private final ShmPool shmPool;
@get
final int width;
@get
final int height;
@get
final int byteWidth;
@get
final @NonNull WlShmFormat format;
Buffer(Display display, int width, int height, int byteWidth, WlShmFormat format) throws IOException {
this.width = width;
this.height = height;
this.byteWidth = byteWidth;
this.format = format;
int bufferSize = width * height * byteWidth;
shmPool = new ShmPool(bufferSize).bindTo(this); // TODO: shouldnt this be a long upstream? maybe wayland is just 32 bit like that
var poolProxy = display.shmProxy.createPool(this, shmPool.fd, bufferSize);
bufferProxy = poolProxy.createBuffer(this, 0, width, height, width * byteWidth, format.value).bindTo(this);
poolProxy.destroy();
}
public ByteBuffer getByteBuffer() {
return shmPool.asByteBuffer();
}
@Override
public void release(WlBufferProxy emitter) {
enqueue(this);
}
public WlBufferProxy getProxy() {
return bufferProxy;
}
}
private void requireNotDestroyed() {
if (destroyed)
throw new IllegalStateException("pool destroyed");
}
public @Nullable Buffer poll() {
requireNotDestroyed();
return ready.poll();
}
@Override
public void closeObject() {
super.closeObject();
destroyed = true;
}
public ShmBufferPool(Display display, int width, int height, int bufferCount, int byteWidth, WlShmFormat shmFormat) throws IOException {
for (int i = 0; i < bufferCount; i++) {
ready.add(new Buffer(display, width, height, byteWidth, shmFormat).bindTo(this));
}
}
public static ShmBufferPool newARGBPool(Display display, int width, int height, int bufferCount) throws IOException {
return new ShmBufferPool(display, width, height, bufferCount, 4, WlShmFormat.ARGB8888);
}
}
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