From eab08b81f6f09d9474594e8e7d074dee5e469d45 Mon Sep 17 00:00:00 2001
From: Greg Wells <gregory@Gregs-MacBook-Pro.local>
Date: Sat, 31 May 2025 06:22:58 -0400
Subject: [PATCH] wait for device

---
 rendering_api/metal/src/core/devices/metal_output_device.m  | 4 ++++
 rendering_api/metal/src/core/devices/metal_output_devices.h | 2 ++
 rendering_api/metal/src/core/present/metal_present.m        | 2 +-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/rendering_api/metal/src/core/devices/metal_output_device.m b/rendering_api/metal/src/core/devices/metal_output_device.m
index eedfd2d..cd83810 100644
--- a/rendering_api/metal/src/core/devices/metal_output_device.m
+++ b/rendering_api/metal/src/core/devices/metal_output_device.m
@@ -17,6 +17,10 @@ gnReturnCode gnCreateOutputDeviceFn(gnOutputDevice* outputDevice, gnInstance* in
     return GN_SUCCESS;
 }
 
+void gnWaitForDeviceFn(gnOutputDevice *device) {
+    [device->outputDevice->executingCommandBuffer waitUntilCompleted];
+}
+
 void gnDestroyOutputDeviceFn(gnOutputDevice* device) {
     for (int i = 0; i < device->outputDevice->queueCount; i++) {
         [device->outputDevice->queues[i] release];
diff --git a/rendering_api/metal/src/core/devices/metal_output_devices.h b/rendering_api/metal/src/core/devices/metal_output_devices.h
index 72872db..967b254 100644
--- a/rendering_api/metal/src/core/devices/metal_output_devices.h
+++ b/rendering_api/metal/src/core/devices/metal_output_devices.h
@@ -15,5 +15,7 @@ struct gnPlatformOutputDevice_t {
     int queueCount;
     id<MTLCommandQueue>* queues;
 
+    id<MTLCommandBuffer> executingCommandBuffer;
+
     id<MTLRenderPipelineState> framebuffer;
 } gnPlatformOutputDevice;
diff --git a/rendering_api/metal/src/core/present/metal_present.m b/rendering_api/metal/src/core/present/metal_present.m
index dc972e6..19e2214 100644
--- a/rendering_api/metal/src/core/present/metal_present.m
+++ b/rendering_api/metal/src/core/present/metal_present.m
@@ -42,7 +42,7 @@ gnReturnCode gnPresentFn(struct gnOutputDevice_t* device, struct gnPresentInfo_t
 
     [commandBuffer presentDrawable:drawable];
     [commandBuffer commit];
-
+    device->outputDevice->executingCommandBuffer = commandBuffer;
 
     return GN_SUCCESS;
 }