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Diffstat (limited to 'src/quick/scenegraph/qsgdefaultrendercontext.cpp')
| -rw-r--r-- | src/quick/scenegraph/qsgdefaultrendercontext.cpp | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/src/quick/scenegraph/qsgdefaultrendercontext.cpp b/src/quick/scenegraph/qsgdefaultrendercontext.cpp new file mode 100644 index 0000000000..1a17453baf --- /dev/null +++ b/src/quick/scenegraph/qsgdefaultrendercontext.cpp @@ -0,0 +1,307 @@ +/**************************************************************************** +** +** 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 "qsgdefaultrendercontext_p.h" + +#include <QtGui/QOpenGLFramebufferObject> + +#include <QtQuick/private/qsgbatchrenderer_p.h> +#include <QtQuick/private/qsgrenderer_p.h> +#include <QtQuick/private/qsgatlastexture_p.h> +#include <QtQuick/private/qsgdefaultdistancefieldglyphcache_p.h> +#include <QtQuick/private/qsgdistancefieldutil_p.h> + +QT_BEGIN_NAMESPACE + +#define QSG_RENDERCONTEXT_PROPERTY "_q_sgrendercontext" + +QSGDefaultRenderContext::QSGDefaultRenderContext(QSGContext *context) + : QSGRenderContext(context) + , m_gl(nullptr) + , m_depthStencilManager(nullptr) + , m_maxTextureSize(0) + , m_brokenIBOs(false) + , m_serializedRender(false) + , m_attachToGLContext(true) + , m_atlasManager(nullptr) +{ + +} + +/*! + Initializes the scene graph render context with the GL context \a context. This also + emits the ready() signal so that the QML graph can start building scene graph nodes. + */ +void QSGDefaultRenderContext::initialize(void *context) +{ + if (!m_sg) + return; + + QOpenGLContext *openglContext = static_cast<QOpenGLContext *>(context); + + QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions(); + funcs->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &m_maxTextureSize); + + // Sanity check the surface format, in case it was overridden by the application + QSurfaceFormat requested = m_sg->defaultSurfaceFormat(); + QSurfaceFormat actual = openglContext->format(); + if (requested.depthBufferSize() > 0 && actual.depthBufferSize() <= 0) + qWarning("QSGContext::initialize: depth buffer support missing, expect rendering errors"); + if (requested.stencilBufferSize() > 0 && actual.stencilBufferSize() <= 0) + qWarning("QSGContext::initialize: stencil buffer support missing, expect rendering errors"); + + if (!m_atlasManager) + m_atlasManager = new QSGAtlasTexture::Manager(); + + Q_ASSERT_X(!m_gl, "QSGRenderContext::initialize", "already initialized!"); + m_gl = openglContext; + if (m_attachToGLContext) { + Q_ASSERT(!openglContext->property(QSG_RENDERCONTEXT_PROPERTY).isValid()); + openglContext->setProperty(QSG_RENDERCONTEXT_PROPERTY, QVariant::fromValue(this)); + } + m_sg->renderContextInitialized(this); + +#ifdef Q_OS_LINUX + const char *vendor = (const char *) funcs->glGetString(GL_VENDOR); + if (vendor && strstr(vendor, "nouveau")) + m_brokenIBOs = true; + const char *renderer = (const char *) funcs->glGetString(GL_RENDERER); + if (renderer && strstr(renderer, "llvmpipe")) + m_serializedRender = true; + if (vendor && renderer && strstr(vendor, "Hisilicon Technologies") && strstr(renderer, "Immersion.16")) + m_brokenIBOs = true; +#endif + + emit initialized(); +} + + +void QSGDefaultRenderContext::invalidate() +{ + if (!m_gl) + return; + + qDeleteAll(m_texturesToDelete); + m_texturesToDelete.clear(); + + qDeleteAll(m_textures); + m_textures.clear(); + + /* The cleanup of the atlas textures is a bit intriguing. + As part of the cleanup in the threaded render loop, we + do: + 1. call this function + 2. call QCoreApp::sendPostedEvents() to immediately process + any pending deferred deletes. + 3. delete the GL context. + + As textures need the atlas manager while cleaning up, the + manager needs to be cleaned up after the textures, so + we post a deleteLater here at the very bottom so it gets + deferred deleted last. + + Another alternative would be to use a QPointer in + QSGAtlasTexture::Texture, but this seemed simpler. + */ + m_atlasManager->invalidate(); + m_atlasManager->deleteLater(); + m_atlasManager = nullptr; + + // The following piece of code will read/write to the font engine's caches, + // potentially from different threads. However, this is safe because this + // code is only called from QQuickWindow's shutdown which is called + // only when the GUI is blocked, and multiple threads will call it in + // sequence. (see qsgdefaultglyphnode_p.cpp's init()) + for (QSet<QFontEngine *>::const_iterator it = m_fontEnginesToClean.constBegin(), + end = m_fontEnginesToClean.constEnd(); it != end; ++it) { + (*it)->clearGlyphCache(m_gl); + if (!(*it)->ref.deref()) + delete *it; + } + m_fontEnginesToClean.clear(); + + delete m_depthStencilManager; + m_depthStencilManager = 0; + + delete m_distanceFieldCacheManager; + m_distanceFieldCacheManager = 0; + + if (m_gl->property(QSG_RENDERCONTEXT_PROPERTY) == QVariant::fromValue(this)) + m_gl->setProperty(QSG_RENDERCONTEXT_PROPERTY, QVariant()); + m_gl = 0; + + if (m_sg) + m_sg->renderContextInvalidated(this); + emit invalidated(); +} + +static QBasicMutex qsg_framerender_mutex; + +void QSGDefaultRenderContext::renderNextFrame(QSGRenderer *renderer, uint fboId) +{ + if (m_serializedRender) + qsg_framerender_mutex.lock(); + + renderer->renderScene(fboId); + + if (m_serializedRender) + qsg_framerender_mutex.unlock(); +} + +/*! + Returns a shared pointer to a depth stencil buffer that can be used with \a fbo. +*/ +QSharedPointer<QSGDepthStencilBuffer> QSGDefaultRenderContext::depthStencilBufferForFbo(QOpenGLFramebufferObject *fbo) +{ + if (!m_gl) + return QSharedPointer<QSGDepthStencilBuffer>(); + QSGDepthStencilBufferManager *manager = depthStencilBufferManager(); + QSGDepthStencilBuffer::Format format; + format.size = fbo->size(); + format.samples = fbo->format().samples(); + format.attachments = QSGDepthStencilBuffer::DepthAttachment | QSGDepthStencilBuffer::StencilAttachment; + QSharedPointer<QSGDepthStencilBuffer> buffer = manager->bufferForFormat(format); + if (buffer.isNull()) { + buffer = QSharedPointer<QSGDepthStencilBuffer>(new QSGDefaultDepthStencilBuffer(m_gl, format)); + manager->insertBuffer(buffer); + } + return buffer; +} + +/*! + Returns a pointer to the context's depth/stencil buffer manager. This is useful for custom + implementations of \l depthStencilBufferForFbo(). +*/ +QSGDepthStencilBufferManager *QSGDefaultRenderContext::depthStencilBufferManager() +{ + if (!m_gl) + return 0; + if (!m_depthStencilManager) + m_depthStencilManager = new QSGDepthStencilBufferManager(m_gl); + return m_depthStencilManager; +} + +QSGTexture *QSGDefaultRenderContext::createTexture(const QImage &image, uint flags) const +{ + bool atlas = flags & CreateTexture_Atlas; + bool mipmap = flags & CreateTexture_Mipmap; + bool alpha = flags & CreateTexture_Alpha; + + // The atlas implementation is only supported from the render thread and + // does not support mipmaps. + if (!mipmap && atlas && openglContext() && QThread::currentThread() == openglContext()->thread()) { + QSGTexture *t = m_atlasManager->create(image, alpha); + if (t) + return t; + } + + QSGPlainTexture *texture = new QSGPlainTexture(); + texture->setImage(image); + if (texture->hasAlphaChannel() && !alpha) + texture->setHasAlphaChannel(false); + + return texture; +} + +QSGRenderer *QSGDefaultRenderContext::createRenderer() +{ + return new QSGBatchRenderer::Renderer(this); +} + +/*! + Compile \a shader, optionally using \a vertexCode and \a fragmentCode as + replacement for the source code supplied by \a shader. + + If \a vertexCode or \a fragmentCode is supplied, the caller is responsible + for setting up attribute bindings. + + \a material is supplied in case the implementation needs to take the + material flags into account. + */ +void QSGDefaultRenderContext::compileShader(QSGMaterialShader *shader, QSGMaterial *material, const char *vertexCode, const char *fragmentCode) +{ + Q_UNUSED(material); + if (vertexCode || fragmentCode) { + Q_ASSERT_X((material->flags() & QSGMaterial::CustomCompileStep) == 0, + "QSGRenderContext::compile()", + "materials with custom compile step cannot have custom vertex/fragment code"); + QOpenGLShaderProgram *p = shader->program(); + p->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexCode ? vertexCode : shader->vertexShader()); + p->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentCode ? fragmentCode : shader->fragmentShader()); + p->link(); + if (!p->isLinked()) + qWarning() << "shader compilation failed:" << endl << p->log(); + } else { + shader->compile(); + } +} + +void QSGDefaultRenderContext::initializeShader(QSGMaterialShader *shader) +{ + shader->program()->bind(); + shader->initialize(); +} + +void QSGDefaultRenderContext::setAttachToGraphicsContext(bool attach) +{ + Q_ASSERT(!isValid()); + m_attachToGLContext = attach; +} + +QSGDefaultRenderContext *QSGDefaultRenderContext::from(QOpenGLContext *context) +{ + return qobject_cast<QSGDefaultRenderContext *>(context->property(QSG_RENDERCONTEXT_PROPERTY).value<QObject *>()); +} + +QT_END_NAMESPACE + + +QSGDistanceFieldGlyphCache *QSGDefaultRenderContext::distanceFieldGlyphCache(const QRawFont &font) +{ + if (!m_distanceFieldCacheManager) + m_distanceFieldCacheManager = new QSGDistanceFieldGlyphCacheManager; + + QSGDistanceFieldGlyphCache *cache = m_distanceFieldCacheManager->cache(font); + if (!cache) { + cache = new QSGDefaultDistanceFieldGlyphCache(m_distanceFieldCacheManager, openglContext(), font); + m_distanceFieldCacheManager->insertCache(font, cache); + } + + return cache; +} |