Add cross-backend simple rect, texture, and ninepatch nodes

QSGSimpleRectNode is deprecated -> use
QSGRectangleNode via QQuickWindow::createRectangleNode() instead.

QSGSimpleTextureNode is deprecated -> use
QSGImageNode via QQuickWindow::createImageNode() instead.

The OpenGL version of the simple rectangle node is switched over to
the vertex color material instead of flat, to allow for better batching.

Use the same concept for nine patch nodes. The "style" node from Quick Controls 1
is now QSGNinePatchNode in order to provide a proper cross-backend solution which
is already necessary due to the software backend, but now generalize it to apply
to the accelerated backends with proper materials as well. QC can now simply call
createNinePatchNode() without further ado.

Also fixes a bug with the D3D12 texture material not enabling blending
when needed.

When it comes to the internal class names, QSGRectangleNode and
QSGImageNode get the Internal prefix in the adaptation layer in order to
differentiate from the public API. This involves quite a lot of renaming,
but results in a nice and clean public API.

Change-Id: Iddf9f9412377843ea6d652bcf25e68d1d74659ea
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 226 insertions, 0 deletions

diff --git a/src/quick/scenegraph/qsgdefaultinternalimagenode.cpp b/src/quick/scenegraph/qsgdefaultinternalimagenode.cpp
new file mode 100644
index 0000000000..1d54628acd
--- /dev/null
+++ b/src/quick/scenegraph/qsgdefaultinternalimagenode.cpp
@@ -0,0 +1,226 @@
+/****************************************************************************
+**
+** 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 "qsgdefaultinternalimagenode_p.h"
+#include <private/qsgmaterialshader_p.h>
+#include <private/qsgtexturematerial_p.h>
+#include <QtGui/qopenglfunctions.h>
+#include <QtCore/qmath.h>
+
+QT_BEGIN_NAMESPACE
+
+class SmoothTextureMaterialShader : public QSGTextureMaterialShader
+{
+public:
+    SmoothTextureMaterialShader();
+
+    virtual void updateState(const RenderState &state, QSGMaterial *newEffect, QSGMaterial *oldEffect);
+    virtual char const *const *attributeNames() const;
+
+protected:
+    virtual void initialize();
+
+    int m_pixelSizeLoc;
+};
+
+
+QSGSmoothTextureMaterial::QSGSmoothTextureMaterial()
+{
+    setFlag(RequiresFullMatrixExceptTranslate, true);
+    setFlag(Blending, true);
+}
+
+void QSGSmoothTextureMaterial::setTexture(QSGTexture *texture)
+{
+    m_texture = texture;
+}
+
+QSGMaterialType *QSGSmoothTextureMaterial::type() const
+{
+    static QSGMaterialType type;
+    return &type;
+}
+
+QSGMaterialShader *QSGSmoothTextureMaterial::createShader() const
+{
+    return new SmoothTextureMaterialShader;
+}
+
+SmoothTextureMaterialShader::SmoothTextureMaterialShader()
+    : QSGTextureMaterialShader()
+{
+    setShaderSourceFile(QOpenGLShader::Vertex, QStringLiteral(":/qt-project.org/scenegraph/shaders/smoothtexture.vert"));
+    setShaderSourceFile(QOpenGLShader::Fragment, QStringLiteral(":/qt-project.org/scenegraph/shaders/smoothtexture.frag"));
+}
+
+void SmoothTextureMaterialShader::updateState(const RenderState &state, QSGMaterial *newEffect, QSGMaterial *oldEffect)
+{
+    if (oldEffect == 0) {
+        // The viewport is constant, so set the pixel size uniform only once.
+        QRect r = state.viewportRect();
+        program()->setUniformValue(m_pixelSizeLoc, 2.0f / r.width(), 2.0f / r.height());
+    }
+    QSGTextureMaterialShader::updateState(state, newEffect, oldEffect);
+}
+
+char const *const *SmoothTextureMaterialShader::attributeNames() const
+{
+    static char const *const attributes[] = {
+        "vertex",
+        "multiTexCoord",
+        "vertexOffset",
+        "texCoordOffset",
+        0
+    };
+    return attributes;
+}
+
+void SmoothTextureMaterialShader::initialize()
+{
+    m_pixelSizeLoc = program()->uniformLocation("pixelSize");
+    QSGTextureMaterialShader::initialize();
+}
+
+QSGDefaultInternalImageNode::QSGDefaultInternalImageNode()
+{
+    setMaterial(&m_materialO);
+    setOpaqueMaterial(&m_material);
+}
+
+void QSGDefaultInternalImageNode::setFiltering(QSGTexture::Filtering filtering)
+{
+    if (m_material.filtering() == filtering)
+        return;
+
+    m_material.setFiltering(filtering);
+    m_materialO.setFiltering(filtering);
+    m_smoothMaterial.setFiltering(filtering);
+    markDirty(DirtyMaterial);
+}
+
+void QSGDefaultInternalImageNode::setMipmapFiltering(QSGTexture::Filtering filtering)
+{
+    if (m_material.mipmapFiltering() == filtering)
+        return;
+
+    m_material.setMipmapFiltering(filtering);
+    m_materialO.setMipmapFiltering(filtering);
+    m_smoothMaterial.setMipmapFiltering(filtering);
+    markDirty(DirtyMaterial);
+}
+
+void QSGDefaultInternalImageNode::setVerticalWrapMode(QSGTexture::WrapMode wrapMode)
+{
+    if (m_material.verticalWrapMode() == wrapMode)
+        return;
+
+    m_material.setVerticalWrapMode(wrapMode);
+    m_materialO.setVerticalWrapMode(wrapMode);
+    m_smoothMaterial.setVerticalWrapMode(wrapMode);
+    markDirty(DirtyMaterial);
+}
+
+void QSGDefaultInternalImageNode::setHorizontalWrapMode(QSGTexture::WrapMode wrapMode)
+{
+    if (m_material.horizontalWrapMode() == wrapMode)
+        return;
+
+    m_material.setHorizontalWrapMode(wrapMode);
+    m_materialO.setHorizontalWrapMode(wrapMode);
+    m_smoothMaterial.setHorizontalWrapMode(wrapMode);
+    markDirty(DirtyMaterial);
+}
+
+void QSGDefaultInternalImageNode::updateMaterialAntialiasing()
+{
+    if (m_antialiasing) {
+        setMaterial(&m_smoothMaterial);
+        setOpaqueMaterial(0);
+    } else {
+        setMaterial(&m_materialO);
+        setOpaqueMaterial(&m_material);
+    }
+}
+
+void QSGDefaultInternalImageNode::setMaterialTexture(QSGTexture *texture)
+{
+    m_material.setTexture(texture);
+    m_materialO.setTexture(texture);
+    m_smoothMaterial.setTexture(texture);
+}
+
+QSGTexture *QSGDefaultInternalImageNode::materialTexture() const
+{
+    return m_material.texture();
+}
+
+bool QSGDefaultInternalImageNode::updateMaterialBlending()
+{
+    const bool alpha = m_material.flags() & QSGMaterial::Blending;
+    if (materialTexture() && alpha != materialTexture()->hasAlphaChannel()) {
+        m_material.setFlag(QSGMaterial::Blending, !alpha);
+        return true;
+    }
+    return false;
+}
+
+inline static bool isPowerOfTwo(int x)
+{
+    // Assumption: x >= 1
+    return x == (x & -x);
+}
+
+bool QSGDefaultInternalImageNode::supportsWrap(const QSize &size) const
+{
+    bool wrapSupported = true;
+
+    QOpenGLContext *ctx = QOpenGLContext::currentContext();
+#ifndef QT_OPENGL_ES_2
+    if (ctx->isOpenGLES())
+#endif
+    {
+        bool npotSupported = ctx->functions()->hasOpenGLFeature(QOpenGLFunctions::NPOTTextureRepeat);
+        const bool isNpot = !isPowerOfTwo(size.width()) || !isPowerOfTwo(size.height());
+        wrapSupported = npotSupported || !isNpot;
+    }
+
+    return wrapSupported;
+}
+
+QT_END_NAMESPACE