From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 gfx/gl/ForceDiscreteGPUHelperCGL.h | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 gfx/gl/ForceDiscreteGPUHelperCGL.h

(limited to 'gfx/gl/ForceDiscreteGPUHelperCGL.h')

diff --git a/gfx/gl/ForceDiscreteGPUHelperCGL.h b/gfx/gl/ForceDiscreteGPUHelperCGL.h
new file mode 100644
index 000000000..3b4cb07ef
--- /dev/null
+++ b/gfx/gl/ForceDiscreteGPUHelperCGL.h
@@ -0,0 +1,36 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ForceDiscreteGPUHelperCGL_h_
+#define ForceDiscreteGPUHelperCGL_h_
+
+#include <OpenGL/OpenGL.h>
+
+/** This RAII helper guarantees that we're on the discrete GPU during its lifetime.
+ * 
+ * As long as any ForceDiscreteGPUHelperCGL object is alive, we're on the discrete GPU.
+ */
+class ForceDiscreteGPUHelperCGL
+{
+    CGLPixelFormatObj mPixelFormatObj;
+
+public:
+    ForceDiscreteGPUHelperCGL()
+    {
+        // the code in this function is taken from Chromium, src/ui/gfx/gl/gl_context_cgl.cc, r122013
+        // BSD-style license, (c) The Chromium Authors
+        CGLPixelFormatAttribute attribs[1];
+        attribs[0] = static_cast<CGLPixelFormatAttribute>(0);
+        GLint num_pixel_formats = 0;
+        CGLChoosePixelFormat(attribs, &mPixelFormatObj, &num_pixel_formats);
+    }
+
+    ~ForceDiscreteGPUHelperCGL()
+    {
+        CGLReleasePixelFormat(mPixelFormatObj);
+    }
+};
+
+#endif // ForceDiscreteGPUHelperCGL_h_
-- 
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