Basic Vulkan enablers

For Android, Windows and xcb. Verified on Win10 with NVIDIA, Win10
with AMD, Android with Tegra K1, Android aarch64 with Tegra X1, and
Linux aarch64 with Tegra X1 (Jetson TX1, L4T).

Introduce QPA-based Vulkan library loader, core function resolver, and
instance creation support. In addition to creating a new VkInstance,
adopting an existing one from an external engine is supported as well.

The WSI specifics are hidden in the platform plugins. Vulkan-capable
windows use the new surface type VulkanSurface and are associated with
a QVulkanInstance.

On Windows VULKAN_SDK is picked up automatically so finding vulkan.h
needs no additional manual steps once the LunarG SDK is installed.

[ChangeLog][QtGui] Added support for rendering to QWindow via the Vulkan
graphics API.

Task-number: QTBUG-55981
Change-Id: I50fa92d313fa440e0cc73939c6d7510ca317fbc9
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 79 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbvulkaninstance.h b/src/plugins/platforms/xcb/qxcbvulkaninstance.h
new file mode 100644
index 0000000000..dbe057d944
--- /dev/null
+++ b/src/plugins/platforms/xcb/qxcbvulkaninstance.h
@@ -0,0 +1,79 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
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+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QXCBVULKANINSTANCE_H
+#define QXCBVULKANINSTANCE_H
+
+#if defined(VULKAN_H_) && !defined(VK_USE_PLATFORM_XCB_KHR)
+#error "vulkan.h included without xcb WSI"
+#endif
+
+#define VK_USE_PLATFORM_XCB_KHR
+
+#include <QtVulkanSupport/private/qbasicvulkanplatforminstance_p.h>
+#include <QLibrary>
+
+QT_BEGIN_NAMESPACE
+
+class QXcbWindow;
+
+class QXcbVulkanInstance : public QBasicPlatformVulkanInstance
+{
+public:
+    QXcbVulkanInstance(QVulkanInstance *instance);
+    ~QXcbVulkanInstance();
+
+    void createOrAdoptInstance() override;
+    bool supportsPresent(VkPhysicalDevice physicalDevice, uint32_t queueFamilyIndex, QWindow *window) override;
+    void presentQueued(QWindow *window) override;
+
+    VkSurfaceKHR createSurface(QXcbWindow *window);
+    void destroySurface(VkSurfaceKHR surface);
+
+private:
+    QVulkanInstance *m_instance;
+    QLibrary m_lib;
+    PFN_vkGetPhysicalDeviceXcbPresentationSupportKHR m_getPhysDevPresSupport;
+    PFN_vkCreateXcbSurfaceKHR m_createSurface;
+    PFN_vkDestroySurfaceKHR m_destroySurface;
+};
+
+QT_END_NAMESPACE
+
+#endif // QXCBVULKANINSTANCE_H