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, 163 insertions, 0 deletions

diff --git a/src/gui/vulkan/qvulkaninstance.h b/src/gui/vulkan/qvulkaninstance.h
new file mode 100644
index 0000000000..b3f08cf0d8
--- /dev/null
+++ b/src/gui/vulkan/qvulkaninstance.h
@@ -0,0 +1,163 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module 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
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** 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
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QVULKANINSTANCE_H
+#define QVULKANINSTANCE_H
+
+#include <QtGui/qtguiglobal.h>
+
+#if QT_CONFIG(vulkan)
+
+#ifndef VK_NO_PROTOTYPES
+#define VK_NO_PROTOTYPES
+#endif
+#include <vulkan/vulkan.h>
+
+#include <QtCore/qscopedpointer.h>
+#include <QtCore/qvector.h>
+#include <QtCore/qbytearraylist.h>
+#include <QtCore/qversionnumber.h>
+#include <QtCore/qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+class QVulkanInstancePrivate;
+class QPlatformVulkanInstance;
+class QVulkanFunctions;
+class QVulkanDeviceFunctions;
+class QWindow;
+
+struct Q_GUI_EXPORT QVulkanLayer
+{
+    QByteArray name;
+    uint32_t version;
+    QVersionNumber specVersion;
+    QByteArray description;
+    bool operator==(const QVulkanLayer &other) const {
+        return name == other.name && version == other.version && specVersion == other.specVersion;
+    }
+};
+
+struct Q_GUI_EXPORT QVulkanExtension
+{
+    QByteArray name;
+    uint32_t version;
+    bool operator==(const QVulkanExtension &other) const {
+        return name == other.name && version == other.version;
+    }
+};
+
+#ifndef QT_NO_DEBUG_STREAM
+Q_GUI_EXPORT QDebug operator<<(QDebug, const QVulkanLayer &);
+Q_GUI_EXPORT QDebug operator<<(QDebug, const QVulkanExtension &);
+#endif
+
+template<typename T>
+class QVulkanInfoVector : public QVector<T>
+{
+public:
+    bool contains(const QByteArray &name) const {
+        return std::any_of(this->cbegin(), this->cend(), [&](const T &entry) {
+            return entry.name == name; });
+    }
+    bool contains(const QByteArray &name, int minVersion) const {
+        return std::any_of(this->cbegin(), this->cend(), [&](const T &entry) {
+            return entry.name == name && entry.version >= minVersion; });
+    }
+};
+
+class Q_GUI_EXPORT QVulkanInstance
+{
+public:
+    QVulkanInstance();
+    ~QVulkanInstance();
+
+    enum Flag {
+        NoDebugOutputRedirect = 0x01
+    };
+    Q_DECLARE_FLAGS(Flags, Flag)
+
+    QVulkanInfoVector<QVulkanLayer> supportedLayers();
+    QVulkanInfoVector<QVulkanExtension> supportedExtensions();
+
+    void setVkInstance(VkInstance existingVkInstance);
+
+    void setFlags(Flags flags);
+    void setLayers(const QByteArrayList &layers);
+    void setExtensions(const QByteArrayList &extensions);
+    void setApiVersion(const QVersionNumber &vulkanVersion);
+
+    bool create();
+    void destroy();
+    bool isValid() const;
+    VkResult errorCode() const;
+
+    VkInstance vkInstance() const;
+
+    Flags flags() const;
+    QByteArrayList layers() const;
+    QByteArrayList extensions() const;
+    QVersionNumber apiVersion() const;
+
+    PFN_vkVoidFunction getInstanceProcAddr(const char *name);
+
+    QPlatformVulkanInstance *handle() const;
+
+    QVulkanFunctions *functions() const;
+    QVulkanDeviceFunctions *deviceFunctions(VkDevice device);
+    void resetDeviceFunctions(VkDevice device);
+
+    static VkSurfaceKHR surfaceForWindow(QWindow *window);
+
+    bool supportsPresent(VkPhysicalDevice physicalDevice, uint32_t queueFamilyIndex, QWindow *window);
+
+    void presentQueued(QWindow *window);
+
+private:
+    QScopedPointer<QVulkanInstancePrivate> d_ptr;
+    Q_DISABLE_COPY(QVulkanInstance)
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(QVulkanInstance::Flags)
+
+QT_END_NAMESPACE
+
+#endif // QT_CONFIG(vulkan)
+
+#endif // QVULKANINSTANCE_H