// Copyright (C) 2016 The Qt Company Ltd. // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only #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 OpenVG OpenVG via EGL \value OpenGL OpenGL ES 2.0 or higher via a graphics abstraction layer. This value was introduced in Qt 5.14. \value Direct3D11 Direct3D 11 via a graphics abstraction layer. This value was introduced in Qt 5.14. \value Vulkan Vulkan 1.0 via a graphics abstraction layer. This value was introduced in Qt 5.14. \value Metal Metal via a graphics abstraction layer. This value was introduced in Qt 5.14. \value Null Null (no output) via a graphics abstraction layer. This value was introduced in Qt 5.14. \omitvalue OpenGLRhi \omitvalue Direct3D11Rhi \omitvalue VulkanRhi \omitvalue MetalRhi \omitvalue NullRhi */ /*! \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 RhiSwapchainResource The resource is a pointer to a QRhiSwapchain instance that is associated with the window. The value is null when the window is used in combination with QQuickRenderControl. This value was introduced in Qt 6.0. \value RhiRedirectCommandBuffer The resource is a pointer to a QRhiCommandBuffer instance that is associated with the window and its QQuickRenderControl. The value is null when the window is not associated with a QQuickRenderControl. This value was introduced in Qt 6.0. \value RhiRedirectRenderTarget The resource is a pointer to a QRhiTextureRenderTarget instance that is associated with the window and its QQuickRenderControl. The value is null when the window is not associated with a QQuickRenderControl. Note that the value always reflects the main texture render target and it does not depend on the Qt Quick scene, meaning it does not take any additional texture-targeting render passes generated by ShaderEffect or QQuickItem layers into account. This value was introduced in Qt 6.0. \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 main render pass used by the scenegraph, describing the color and depth/stecil attachments and how they are used. For example, a \c{VkRenderPass *}. Note that the value always reflects the main render target (either the on-screen window or the texture QQuickRenderControl redirects to) and it does not depend on the Qt Quick scene, meaning it does not take any additional texture-targeting render passes generated by ShaderEffect or QQuickItem layers into account. This value was introduced in Qt 5.14. \value RedirectPaintDevice The resource is a pointer to QPaintDevice instance that is associated with the window and its QQuickRenderControl. The value is null when the window is not associated with a QQuickRenderControl. This value was introduced in Qt 6.4. */ /*! \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 */ /*! \enum QSGRendererInterface::RenderMode \value RenderMode2D Normal 2D rendering \value RenderMode2DNoDepthBuffer Normal 2D rendering with depth buffer disabled \value RenderMode3D Scene is rendered as part of a 3D graph */ 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, or a pointer to an opaque handle that needs to be dereferenced first (for example, \c{VkDevice dev = *static_cast(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