From e5b9605ab2dc8fd73bdc44ff0d40034d326c1bdf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20K=C3=A4fer?= <mail@kkaefer.com>
Date: Thu, 9 Feb 2017 12:08:23 +0100
Subject: [macos] reuse OpenGL context when switching screens

Cherry-picked from 43e81509fb0be54bea5912fb5a10bfa0e0667a44.
---
 platform/macos/src/MGLOpenGLLayer.mm | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'platform/macos/src')

diff --git a/platform/macos/src/MGLOpenGLLayer.mm b/platform/macos/src/MGLOpenGLLayer.mm
index 654fa4f2bc..b1040f26e8 100644
--- a/platform/macos/src/MGLOpenGLLayer.mm
+++ b/platform/macos/src/MGLOpenGLLayer.mm
@@ -4,7 +4,9 @@
 
 #import <mbgl/gl/gl.hpp>
 
-@implementation MGLOpenGLLayer
+@implementation MGLOpenGLLayer {
+    NSOpenGLContext *_context;
+}
 
 - (MGLMapView *)mapView {
     return (MGLMapView *)super.view;
@@ -22,6 +24,13 @@
     return self.view.bounds;
 }
 
+- (NSOpenGLContext *)openGLContextForPixelFormat:(NSOpenGLPixelFormat *)pixelFormat {
+    if (!_context) {
+        _context = [[NSOpenGLContext alloc] initWithFormat:pixelFormat shareContext:nil];
+    }
+    return _context;
+}
+
 - (NSOpenGLPixelFormat *)openGLPixelFormatForDisplayMask:(uint32_t)mask {
     NSOpenGLPixelFormatAttribute pfas[] = {
         NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersionLegacy,
-- 
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