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Diffstat (limited to 'examples/quick/scenegraph/simplematerial/simplematerialitem.cpp')
| -rw-r--r-- | examples/quick/scenegraph/simplematerial/simplematerialitem.cpp | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/examples/quick/scenegraph/simplematerial/simplematerialitem.cpp b/examples/quick/scenegraph/simplematerial/simplematerialitem.cpp new file mode 100644 index 0000000000..c4c7b2e07e --- /dev/null +++ b/examples/quick/scenegraph/simplematerial/simplematerialitem.cpp @@ -0,0 +1,169 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the demonstration applications of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "simplematerialitem.h" + +#include <QtQuick/qsgsimplematerial.h> +#include <QtQuick/qsggeometry.h> +#include <QtQuick/qsgnode.h> + +//! [1] +struct State +{ + QColor color; + + int compare(const State *other) const { + uint rgb = color.rgba(); + uint otherRgb = other->color.rgba(); + + if (rgb == otherRgb) { + return 0; + } else if (rgb < otherRgb) { + return -1; + } else { + return 1; + } + } +}; +//! [1] + +//! [2] +class Shader : public QSGSimpleMaterialShader<State> +{ + QSG_DECLARE_SIMPLE_COMPARABLE_SHADER(Shader, State); +//! [2] //! [3] +public: + + const char *vertexShader() const override { + return + "attribute highp vec4 aVertex; \n" + "attribute highp vec2 aTexCoord; \n" + "uniform highp mat4 qt_Matrix; \n" + "varying highp vec2 texCoord; \n" + "void main() { \n" + " gl_Position = qt_Matrix * aVertex; \n" + " texCoord = aTexCoord; \n" + "}"; + } + + const char *fragmentShader() const override { + return + "uniform lowp float qt_Opacity; \n" + "uniform lowp vec4 color; \n" + "varying highp vec2 texCoord; \n" + "void main () \n" + "{ \n" + " gl_FragColor = texCoord.y * texCoord.x * color * qt_Opacity; \n" + "}"; + } +//! [3] //! [4] + QList<QByteArray> attributes() const override + { + return QList<QByteArray>() << "aVertex" << "aTexCoord"; + } +//! [4] //! [5] + void updateState(const State *state, const State *) override + { + program()->setUniformValue(id_color, state->color); + } +//! [5] //! [6] + void resolveUniforms() override + { + id_color = program()->uniformLocation("color"); + } + +private: + int id_color; +//! [6] +}; + + +//! [7] +class ColorNode : public QSGGeometryNode +{ +public: + ColorNode() + : m_geometry(QSGGeometry::defaultAttributes_TexturedPoint2D(), 4) + { + setGeometry(&m_geometry); + + QSGSimpleMaterial<State> *material = Shader::createMaterial(); + material->setFlag(QSGMaterial::Blending); + setMaterial(material); + setFlag(OwnsMaterial); + } + + QSGGeometry m_geometry; +}; +//! [7] + +void SimpleMaterialItem::setColor(const QColor &color) { + if (m_color != color) { + m_color = color; + emit colorChanged(); + update(); + } +} + +//! [9] +QSGNode *SimpleMaterialItem::updatePaintNode(QSGNode *node, QQuickItem::UpdatePaintNodeData *) +{ + ColorNode *n = static_cast<ColorNode *>(node); + if (!node) + n = new ColorNode(); + + QSGGeometry::updateTexturedRectGeometry(n->geometry(), boundingRect(), QRectF(0, 0, 1, 1)); + static_cast<QSGSimpleMaterial<State>*>(n->material())->state()->color = m_color; + + n->markDirty(QSGNode::DirtyGeometry | QSGNode::DirtyMaterial); + + return n; +} +//! [9] |