From e35c1f8c87354bb20f9485efa4e0d77ea5bf35b1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20K=C3=A4fer?= <mail@kkaefer.com>
Date: Wed, 25 Jan 2017 10:58:47 +0100
Subject: [PATCH] [macos] align HeadlessDisplay with SDK OpenGL context
 creation options

Cherry-picked from 2a077eaa5483b243e817a328adaea1027a48e7a7.
---
 platform/default/headless_display.cpp | 10 ++++++++--
 platform/macos/src/MGLOpenGLLayer.mm  |  1 +
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/platform/default/headless_display.cpp b/platform/default/headless_display.cpp
index aa57d66cd..b61848d1a 100644
--- a/platform/default/headless_display.cpp
+++ b/platform/default/headless_display.cpp
@@ -15,8 +15,14 @@ HeadlessDisplay::HeadlessDisplay() {
     // TODO: test if OpenGL 4.1 with GL_ARB_ES2_compatibility is supported
     // If it is, use kCGLOGLPVersion_3_2_Core and enable that extension.
     CGLPixelFormatAttribute attributes[] = {
-        kCGLPFAOpenGLProfile,
-        static_cast<CGLPixelFormatAttribute>(kCGLOGLPVersion_Legacy),
+        kCGLPFAOpenGLProfile, static_cast<CGLPixelFormatAttribute>(kCGLOGLPVersion_Legacy),
+        // Not adding kCGLPFAAccelerated, as this will make headless rendering impossible when running in VMs.
+        kCGLPFAClosestPolicy,
+        kCGLPFAAccumSize, static_cast<CGLPixelFormatAttribute>(32),
+        kCGLPFAColorSize, static_cast<CGLPixelFormatAttribute>(24),
+        kCGLPFAAlphaSize, static_cast<CGLPixelFormatAttribute>(8),
+        kCGLPFADepthSize, static_cast<CGLPixelFormatAttribute>(16),
+        kCGLPFAStencilSize, static_cast<CGLPixelFormatAttribute>(8),
         kCGLPFASupportsAutomaticGraphicsSwitching,
         kCGLPFAAllowOfflineRenderers, // Allows using the integrated GPU
         static_cast<CGLPixelFormatAttribute>(0)
diff --git a/platform/macos/src/MGLOpenGLLayer.mm b/platform/macos/src/MGLOpenGLLayer.mm
index 523b58505..654fa4f2b 100644
--- a/platform/macos/src/MGLOpenGLLayer.mm
+++ b/platform/macos/src/MGLOpenGLLayer.mm
@@ -24,6 +24,7 @@
 
 - (NSOpenGLPixelFormat *)openGLPixelFormatForDisplayMask:(uint32_t)mask {
     NSOpenGLPixelFormatAttribute pfas[] = {
+        NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersionLegacy,
         NSOpenGLPFAAccelerated,
         NSOpenGLPFAClosestPolicy,
         NSOpenGLPFAAccumSize, 32,