From 048aa1659961c8f4dcde4c24401dad5ec24c2960 Mon Sep 17 00:00:00 2001
From: Stuart Carnie <stuart.carnie@gmail.com>
Date: Wed, 4 Jul 2018 09:50:09 -0700
Subject: [PATCH] feat(Metal): Support vsync enable / disable

---
 gfx/common/metal/Context.h |  3 +++
 gfx/common/metal/Context.m | 11 +++++++++++
 gfx/drivers/metal.m        |  5 ++++-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/gfx/common/metal/Context.h b/gfx/common/metal/Context.h
index d335e80510..eeb687fc10 100644
--- a/gfx/common/metal/Context.h
+++ b/gfx/common/metal/Context.h
@@ -29,6 +29,9 @@ typedef struct
 @property (nonatomic, readonly) id<MTLLibrary> library;
 @property (nonatomic, readwrite) MTLClearColor clearColor;
 
+/*! @brief Specifies whether rendering is synchronized with the display */
+@property (nonatomic, readwrite) bool displaySyncEnabled;
+
 /*! @brief Returns the command buffer used for pre-render work,
  * such as mip maps for applying filters
  * */
diff --git a/gfx/common/metal/Context.m b/gfx/common/metal/Context.m
index 1610d1c56a..91d5ac4c27 100644
--- a/gfx/common/metal/Context.m
+++ b/gfx/common/metal/Context.m
@@ -60,6 +60,7 @@
       _inflightSemaphore = dispatch_semaphore_create(MAX_INFLIGHT);
       _device = d;
       _layer = layer;
+      _layer.displaySyncEnabled = YES;
       _library = l;
       _commandQueue = [_device newCommandQueue];
       _clearColor = MTLClearColorMake(0, 0, 0, 1);
@@ -99,6 +100,16 @@
    return self;
 }
 
+- (void)setDisplaySyncEnabled:(bool)displaySyncEnabled
+{
+   _layer.displaySyncEnabled = displaySyncEnabled;
+}
+
+- (bool)displaySyncEnabled
+{
+   return _layer.displaySyncEnabled;
+}
+
 - (bool)_initMainState
 {
    return YES;
diff --git a/gfx/drivers/metal.m b/gfx/drivers/metal.m
index 8ba2ae7b5b..773848546e 100644
--- a/gfx/drivers/metal.m
+++ b/gfx/drivers/metal.m
@@ -75,8 +75,11 @@ static bool metal_frame(void *data, const void *frame,
                      info:video_info];
 }
 
-static void metal_set_nonblock_state(void *data, bool state)
+static void metal_set_nonblock_state(void *data, bool non_block)
 {
+   RARCH_LOG("[Metal]: set non block: %s\n", non_block ? "ON" : "OFF");
+   MetalDriver *md = (__bridge MetalDriver *)data;
+   md.context.displaySyncEnabled = !non_block;
 }
 
 static bool metal_alive(void *data)