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Diffstat (limited to 'examples/quick/scenegraph/rendernode/openglrenderer.cpp')
| -rw-r--r-- | examples/quick/scenegraph/rendernode/openglrenderer.cpp | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/examples/quick/scenegraph/rendernode/openglrenderer.cpp b/examples/quick/scenegraph/rendernode/openglrenderer.cpp new file mode 100644 index 0000000000..3de864b7b9 --- /dev/null +++ b/examples/quick/scenegraph/rendernode/openglrenderer.cpp @@ -0,0 +1,164 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 "openglrenderer.h" +#include <QQuickItem> + +#ifndef QT_NO_OPENGL + +#include <QOpenGLShaderProgram> +#include <QOpenGLBuffer> +#include <QOpenGLFunctions> + +OpenGLRenderNode::OpenGLRenderNode(QQuickItem *item) + : m_item(item) +{ +} + +OpenGLRenderNode::~OpenGLRenderNode() +{ + releaseResources(); +} + +void OpenGLRenderNode::releaseResources() +{ + delete m_program; + m_program = nullptr; + delete m_vbo; + m_vbo = nullptr; +} + +void OpenGLRenderNode::init() +{ + m_program = new QOpenGLShaderProgram; + + static const char *vertexShaderSource = + "attribute highp vec4 posAttr;\n" + "attribute lowp vec4 colAttr;\n" + "varying lowp vec4 col;\n" + "uniform highp mat4 matrix;\n" + "void main() {\n" + " col = colAttr;\n" + " gl_Position = matrix * posAttr;\n" + "}\n"; + + static const char *fragmentShaderSource = + "varying lowp vec4 col;\n" + "uniform lowp float opacity;\n" + "void main() {\n" + " gl_FragColor = col * opacity;\n" + "}\n"; + + m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSource); + m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSource); + m_program->bindAttributeLocation("posAttr", 0); + m_program->bindAttributeLocation("colAttr", 1); + m_program->link(); + + m_matrixUniform = m_program->uniformLocation("matrix"); + m_opacityUniform = m_program->uniformLocation("opacity"); + + const int VERTEX_SIZE = 6 * sizeof(GLfloat); + + static GLfloat colors[] = { + 1.0f, 0.0f, 0.0f, + 0.0f, 1.0f, 0.0f, + 0.0f, 0.0f, 1.0f + }; + + m_vbo = new QOpenGLBuffer; + m_vbo->create(); + m_vbo->bind(); + m_vbo->allocate(VERTEX_SIZE + sizeof(colors)); + m_vbo->write(VERTEX_SIZE, colors, sizeof(colors)); + m_vbo->release(); +} + +void OpenGLRenderNode::render(const RenderState *state) +{ + if (!m_program) + init(); + + QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions(); + + m_program->bind(); + m_program->setUniformValue(m_matrixUniform, *state->projectionMatrix() * *matrix()); + m_program->setUniformValue(m_opacityUniform, float(inheritedOpacity())); + + m_vbo->bind(); + + QPointF p0(m_item->width() - 1, m_item->height() - 1); + QPointF p1(0, 0); + QPointF p2(0, m_item->height() - 1); + + GLfloat vertices[6] = { GLfloat(p0.x()), GLfloat(p0.y()), + GLfloat(p1.x()), GLfloat(p1.y()), + GLfloat(p2.x()), GLfloat(p2.y()) }; + m_vbo->write(0, vertices, sizeof(vertices)); + + m_program->setAttributeBuffer(0, GL_FLOAT, 0, 2); + m_program->setAttributeBuffer(1, GL_FLOAT, sizeof(vertices), 3); + m_program->enableAttributeArray(0); + m_program->enableAttributeArray(1); + + // Note that clipping (scissor or stencil) is ignored in this example. + + f->glEnable(GL_BLEND); + f->glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA); + + f->glDrawArrays(GL_TRIANGLES, 0, 3); +} + +QSGRenderNode::StateFlags OpenGLRenderNode::changedStates() const +{ + return BlendState; +} + +QSGRenderNode::RenderingFlags OpenGLRenderNode::flags() const +{ + return BoundedRectRendering | DepthAwareRendering; +} + +QRectF OpenGLRenderNode::rect() const +{ + return QRect(0, 0, m_item->width(), m_item->height()); +} + +#endif // QT_NO_OPENGL |