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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsgrendererinterface.h"
QT_BEGIN_NAMESPACE
/*!
\class QSGRendererInterface
\brief An interface providing access to some of the graphics API specific internals
of the scenegraph.
\inmodule QtQuick
\since 5.8
Renderer interfaces allow accessing graphics API specific functionality in
the scenegraph. Such internals are not typically exposed. However, when
integrating custom rendering via QSGRenderNode for example, it may become
necessary to query certain values, for instance the graphics device (e.g.
the Direct3D or Vulkan device) that is used by the scenegraph.
QSGRendererInterface's functions have varying availability. API and
language queries, such as, graphicsApi() or shaderType() are always
available, meaning it is sufficient to construct a QQuickWindow or
QQuickView, and the graphics API or shading language in use can be queried
right after via QQuickWindow::rendererInterface(). This guarantees that
utilities like the GraphicsInfo QML type are able to report the correct
values as early as possible, without having conditional property values -
depending on for instance shaderType() - evaluate to unexpected values.
Engine-specific accessors, like getResource(), are however available only
after the scenegraph is initialized. Additionally, there may be
backend-specific limitations on when such functions can be called. The only
way that is guaranteed to succeed is calling them when the rendering of a
node (i.e. the preparation of the command list for the next frame) is
active. In practice this typically means QSGRenderNode::render().
*/
/*!
\enum QSGRendererInterface::GraphicsApi
\value Unknown An unknown graphics API is in use
\value Software The Qt Quick 2D Renderer is in use
\value OpenGL OpenGL ES 2.0 or higher
\value Direct3D12 Direct3D 12
\value OpenVG OpenVG via EGL
\value OpenGLRhi OpenGL ES 2.0 or higher via a graphics abstraction layer. This value was introduced in Qt 5.14.
\value Direct3D11Rhi Direct3D 11 via a graphics abstraction layer. This value was introduced in Qt 5.14.
\value VulkanRhi Vulkan 1.0 via a graphics abstraction layer. This value was introduced in Qt 5.14.
\value MetalRhi Metal via a graphics abstraction layer. This value was introduced in Qt 5.14.
\value NullRhi Null (no output) via a graphics abstraction layer. This value was introduced in Qt 5.14.
*/
/*!
\enum QSGRendererInterface::Resource
\value DeviceResource The resource is a pointer to the graphics device,
when applicable. For example, a \c{VkDevice *}, \c{MTLDevice *} or
\c{ID3D11Device *}. Note that with Vulkan the returned value is a pointer
to the VkDevice, not the handle itself. This is because Vulkan handles may
not be pointers, and may use a different size from the architecture's
pointer size so merely casting to/from \c{void *} is wrong.
\value CommandQueueResource The resource is a pointer to the graphics
command queue used by the scenegraph, when applicable. For example, a
\c{VkQueue *} or \c{MTLCommandQueue *}. Note that with Vulkan the returned
value is a pointer to the VkQueue, not the handle itself.
\value CommandListResource The resource is a pointer to the command list or
buffer used by the scenegraph, when applicable. For example, a
\c{VkCommandBuffer *} or \c{MTLCommandBuffer *}. This object has limited
validity, and is only valid while the scene graph is preparing the next
frame. Note that with Vulkan the returned value is a pointer to the
VkCommandBuffer, not the handle itself.
\value PainterResource The resource is a pointer to the active QPainter
used by the scenegraph, when running with the software backend.
\value RhiResource The resource is a pointer to the QRhi instance used by
the scenegraph, when applicable. This value was introduced in Qt 5.14.
\value PhysicalDeviceResource The resource is a pointer to the pysical
device object used by the scenegraph, when applicable. For example, a
\c{VkPhysicalDevice *}. Note that with Vulkan the returned value is a
pointer to the VkPhysicalDevice, not the handle itself. This value was
introduced in Qt 5.14.
\value OpenGLContextResource The resource is a pointer to the
QOpenGLContext used by the scenegraph (on the render thread), when
applicable. This value was introduced in Qt 5.14.
\value DeviceContextResource The resource is a pointer to the device
context used by the scenegraph, when applicable. For example, a
\c{ID3D11DeviceContext *}. This value was introduced in Qt 5.14.
\value CommandEncoderResource The resource is a pointer to the currently
active render command encoder object used by the scenegraph, when
applicable. For example, a \c{MTLRenderCommandEncoder *}. This object has
limited validity, and is only valid while the scene graph is recording a
render pass for the next frame. This value was introduced in Qt 5.14.
\value VulkanInstanceResource The resource is a pointer to the
QVulkanInstance used by the scenegraph, when applicable. This value was
introduced in Qt 5.14.
\value RenderPassResource The resource is a pointer to the render pass used
by the scenegraph, describing the color and depth/stecil attachments and
how they are used. For example, a \c{VkRenderPass *}. This value was
introduced in Qt 5.14.
*/
/*!
\enum QSGRendererInterface::ShaderType
\value UnknownShadingLanguage Not yet known due to no window and scenegraph associated
\value GLSL GLSL or GLSL ES
\value HLSL HLSL
\value RhiShader Consumes QShader instances containing shader variants for
multiple target languages and intermediate formats. This value was introduced in
Qt 5.14.
*/
/*!
\enum QSGRendererInterface::ShaderCompilationType
\value RuntimeCompilation Runtime compilation of shader source code is supported
\value OfflineCompilation Pre-compiled bytecode supported
*/
/*!
\enum QSGRendererInterface::ShaderSourceType
\value ShaderSourceString Shader source can be provided as a string in
the corresponding properties of ShaderEffect
\value ShaderSourceFile Local or resource files containing shader source
code are supported
\value ShaderByteCode Local or resource files containing shader bytecode are
supported
*/
QSGRendererInterface::~QSGRendererInterface()
{
}
/*!
\fn QSGRendererInterface::GraphicsApi QSGRendererInterface::graphicsApi() const
Returns the graphics API that is in use by the Qt Quick scenegraph.
\note This function can be called on any thread.
*/
/*!
Queries a graphics \a resource in \a window. Returns null when the resource in question is
not supported or not available.
When successful, the returned pointer is either a direct pointer to an
interface (and can be cast, for example, to \c{ID3D12Device *}) or a
pointer to an opaque handle that needs to be dereferenced first (for
example, \c{VkDevice dev = *static_cast<VkDevice *>(result)}). The latter
is necessary since such handles may have sizes different from a pointer.
\note The ownership of the returned pointer is never transferred to the caller.
\note This function must only be called on the render thread.
*/
void *QSGRendererInterface::getResource(QQuickWindow *window, Resource resource) const
{
Q_UNUSED(window);
Q_UNUSED(resource);
return nullptr;
}
/*!
Queries a graphics resource. \a resource is a backend-specific key. This
allows supporting any future resources that are not listed in the
Resource enum.
\note The ownership of the returned pointer is never transferred to the caller.
\note This function must only be called on the render thread.
*/
void *QSGRendererInterface::getResource(QQuickWindow *window, const char *resource) const
{
Q_UNUSED(window);
Q_UNUSED(resource);
return nullptr;
}
/*!
\return true if \a api is based on a graphics abstraction layer (QRhi)
instead of directly calling the native graphics API.
\note This function can be called on any thread.
\since 5.14
*/
bool QSGRendererInterface::isApiRhiBased(GraphicsApi api)
{
switch (api) {
case OpenGLRhi:
Q_FALLTHROUGH();
case Direct3D11Rhi:
Q_FALLTHROUGH();
case VulkanRhi:
Q_FALLTHROUGH();
case MetalRhi:
Q_FALLTHROUGH();
case NullRhi:
return true;
default:
return false;
}
}
/*!
\fn QSGRendererInterface::ShaderType QSGRendererInterface::shaderType() const
\return the shading language supported by the Qt Quick backend the
application is using.
\note This function can be called on any thread.
\sa QtQuick::GraphicsInfo
*/
/*!
\fn QSGRendererInterface::ShaderCompilationTypes QSGRendererInterface::shaderCompilationType() const
\return a bitmask of the shader compilation approaches supported by the Qt
Quick backend the application is using.
\note This function can be called on any thread.
\sa QtQuick::GraphicsInfo
*/
/*!
\fn QSGRendererInterface::ShaderSourceTypes QSGRendererInterface::shaderSourceType() const
\return a bitmask of the supported ways of providing shader sources in ShaderEffect items.
\note This function can be called on any thread.
\sa QtQuick::GraphicsInfo
*/
QT_END_NAMESPACE
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