From c44accbfb5c93c96a50af30f10b803cad536c697 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Fri, 19 Apr 2019 20:20:29 +0900
Subject: [PATCH] graphicsdriver/metal: Bug fix: Release drawable correctly

Fixes #847
---
 internal/graphicsdriver/metal/ca/ca.go  | 4 ++++
 internal/graphicsdriver/metal/ca/ca.h   | 1 +
 internal/graphicsdriver/metal/ca/ca.m   | 4 ++++
 internal/graphicsdriver/metal/driver.go | 1 +
 4 files changed, 10 insertions(+)

diff --git a/internal/graphicsdriver/metal/ca/ca.go b/internal/graphicsdriver/metal/ca/ca.go
index 30f44aae5..d7df1a94e 100644
--- a/internal/graphicsdriver/metal/ca/ca.go
+++ b/internal/graphicsdriver/metal/ca/ca.go
@@ -152,3 +152,7 @@ func (md MetalDrawable) Drawable() unsafe.Pointer { return md.metalDrawable }
 func (md MetalDrawable) Texture() mtl.Texture {
 	return mtl.NewTexture(C.MetalDrawable_Texture(md.metalDrawable))
 }
+
+func (md MetalDrawable) Release() {
+	C.MetalDrawable_Release(md.metalDrawable)
+}
diff --git a/internal/graphicsdriver/metal/ca/ca.h b/internal/graphicsdriver/metal/ca/ca.h
index 4190a41f2..435965975 100644
--- a/internal/graphicsdriver/metal/ca/ca.h
+++ b/internal/graphicsdriver/metal/ca/ca.h
@@ -31,3 +31,4 @@ void MetalLayer_SetDrawableSize(void *metalLayer, double width, double height);
 void *MetalLayer_NextDrawable(void *metalLayer);
 
 void *MetalDrawable_Texture(void *drawable);
+void MetalDrawable_Release(void *drawable);
diff --git a/internal/graphicsdriver/metal/ca/ca.m b/internal/graphicsdriver/metal/ca/ca.m
index b168c8d18..a8a47f195 100644
--- a/internal/graphicsdriver/metal/ca/ca.m
+++ b/internal/graphicsdriver/metal/ca/ca.m
@@ -89,3 +89,7 @@ void *MetalLayer_NextDrawable(void *metalLayer) {
 void *MetalDrawable_Texture(void *metalDrawable) {
   return ((id<CAMetalDrawable>)metalDrawable).texture;
 }
+
+void MetalDrawable_Release(void *metalDrawable) {
+  [(id<CAMetalDrawable>)metalDrawable release];
+}
diff --git a/internal/graphicsdriver/metal/driver.go b/internal/graphicsdriver/metal/driver.go
index 3e1792b5c..e0e898367 100644
--- a/internal/graphicsdriver/metal/driver.go
+++ b/internal/graphicsdriver/metal/driver.go
@@ -598,6 +598,7 @@ func (d *Driver) Draw(indexLen int, indexOffset int, mode graphics.CompositeMode
 			}
 			t = d.screenDrawable.Texture()
 		} else {
+			d.screenDrawable.Release()
 			d.screenDrawable = ca.MetalDrawable{}
 			t = d.dst.texture
 		}