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Diffstat (limited to 'tests/manual/stereographicsview/mygraphicsview.cpp')
| -rw-r--r-- | tests/manual/stereographicsview/mygraphicsview.cpp | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/tests/manual/stereographicsview/mygraphicsview.cpp b/tests/manual/stereographicsview/mygraphicsview.cpp new file mode 100644 index 0000000000..933ee00835 --- /dev/null +++ b/tests/manual/stereographicsview/mygraphicsview.cpp @@ -0,0 +1,209 @@ +// Copyright (C) 2022 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only + +#include "mygraphicsview.h" +#include <QResizeEvent> +#include <QFileDialog> + +Q_OPENGL_EXPORT QImage qt_gl_read_framebuffer(const QSize &size, bool alpha_format, bool include_alpha); + +MyGraphicsView::MyGraphicsView(QWidget *parent) : + QGraphicsView(parent), + m_indexBuf(QOpenGLBuffer::IndexBuffer) +{ + +} + +MyGraphicsView::MyGraphicsView(QGraphicsScene *scene, QWidget *parent) : + QGraphicsView(scene, parent) +{ + +} + +void MyGraphicsView::saveImage(QOpenGLWidget::TargetBuffer targetBuffer) +{ + QOpenGLWidget *w = static_cast<QOpenGLWidget*>(viewport()); + Q_ASSERT(w); + + w->makeCurrent(targetBuffer); + draw(targetBuffer); + + QImage img = qt_gl_read_framebuffer(w->size() * w->devicePixelRatio(), true, true); + + if (img.isNull()) { + qFatal("Failed to grab framebuffer"); + } + + const char *fn = + targetBuffer == QOpenGLWidget::LeftBuffer + ? "leftBuffer.png" : "rightBuffer.png"; + + QFileDialog fd(this); + fd.setAcceptMode(QFileDialog::AcceptSave); + fd.setDefaultSuffix("png"); + fd.selectFile(fn); + if (fd.exec() == QDialog::Accepted) + img.save(fd.selectedFiles().first()); +} + +void MyGraphicsView::drawBackground(QPainter *painter, const QRectF &rect) +{ + if (!m_initialized) + init(); + + QOpenGLWidget *w = static_cast<QOpenGLWidget*>(viewport()); + + painter->beginNativePainting(); + + draw(w->currentTargetBuffer()); + + painter->endNativePainting(); + + + m_yaw += 0.5; + if (m_yaw > 360) + m_yaw = 0; +} + +void MyGraphicsView::resizeEvent(QResizeEvent *event) +{ + QGraphicsView::resizeEvent(event); + + resize(event->size().width(), event->size().height()); +} + +void MyGraphicsView::init() +{ + if (m_initialized) + return; + + initializeOpenGLFunctions(); + + initShaders(); + initCube(); + + resize(viewport()->width(), viewport()->height()); + + m_initialized = true; +} + +void MyGraphicsView::initShaders() +{ + static const char *vertexShaderSource = + "#ifdef GL_ES\n" + "// Set default precision to medium\n" + "precision mediump int;\n" + "precision mediump float;\n" + "#endif\n" + "attribute vec4 a_position;\n" + "uniform mat4 u_mvp;\n" + "void main() {\n" + "gl_Position = u_mvp * a_position;\n" + "}\n"; + + static const char *fragmentShaderSource = + "#ifdef GL_ES\n" + "// Set default precision to medium\n" + "precision mediump int;\n" + "precision mediump float;\n" + "#endif\n" + "void main() {\n" + "gl_FragColor = vec4(0.7, 0.1, 0.0, 1.0);\n" + "}\n"; + + if (!m_program.addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSource)) + close(); + + if (!m_program.addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSource)) + close(); + + if (!m_program.link()) + close(); + + if (!m_program.bind()) + close(); +} + +void MyGraphicsView::initCube() +{ + m_arrayBuf.create(); + m_indexBuf.create(); + + QVector3D vertices[] = { + QVector3D(-1.0f, -1.0f, 1.0f), + QVector3D( 1.0f, -1.0f, 1.0f), + QVector3D(-1.0f, 1.0f, 1.0f), + QVector3D( 1.0f, 1.0f, 1.0f), + QVector3D( 1.0f, -1.0f, 1.0f), + QVector3D( 1.0f, -1.0f, -1.0f), + QVector3D( 1.0f, 1.0f, 1.0f), + QVector3D( 1.0f, 1.0f, -1.0f), + QVector3D( 1.0f, -1.0f, -1.0f), + QVector3D(-1.0f, -1.0f, -1.0f), + QVector3D( 1.0f, 1.0f, -1.0f), + QVector3D(-1.0f, 1.0f, -1.0f), + QVector3D(-1.0f, -1.0f, -1.0f), + QVector3D(-1.0f, -1.0f, 1.0f), + QVector3D(-1.0f, 1.0f, -1.0f), + QVector3D(-1.0f, 1.0f, 1.0f), + QVector3D(-1.0f, -1.0f, -1.0f), + QVector3D( 1.0f, -1.0f, -1.0f), + QVector3D(-1.0f, -1.0f, 1.0f), + QVector3D( 1.0f, -1.0f, 1.0f), + QVector3D(-1.0f, 1.0f, 1.0f), + QVector3D( 1.0f, 1.0f, 1.0f), + QVector3D(-1.0f, 1.0f, -1.0f), + QVector3D( 1.0f, 1.0f, -1.0f) + }; + + GLushort indices[] = { + 0, 1, 2, 3, 3, + 4, 4, 5, 6, 7, 7, + 8, 8, 9, 10, 11, 11, + 12, 12, 13, 14, 15, 15, + 16, 16, 17, 18, 19, 19, + 20, 20, 21, 22, 23 + }; + + + m_arrayBuf.bind(); + m_arrayBuf.allocate(vertices, 24 * sizeof(QVector3D)); + + m_indexBuf.bind(); + m_indexBuf.allocate(indices, 34 * sizeof(GLushort)); +} + +void MyGraphicsView::draw(QOpenGLWidget::TargetBuffer targetBuffer) +{ + glClearColor(0.0f, 0.7f, 0.0f, 1.0f); + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + m_program.bind(); + m_arrayBuf.bind(); + m_indexBuf.bind(); + + QMatrix4x4 matrix; + matrix.translate(targetBuffer == QOpenGLWidget::LeftBuffer ? -2.0 : 2.0, + 0.0, + -10.0); + matrix.scale(2.0); + matrix.rotate(QQuaternion::fromEulerAngles(10, m_yaw, 0)); + m_program.setUniformValue("u_mvp", m_projection * matrix); + + int vertexLocation = m_program.attributeLocation("a_position"); + m_program.enableAttributeArray(vertexLocation); + m_program.setAttributeBuffer(vertexLocation, GL_FLOAT, 0, 3, sizeof(QVector3D)); + + glDrawElements(GL_TRIANGLE_STRIP, 34, GL_UNSIGNED_SHORT, nullptr); +} + +void MyGraphicsView::resize(int w, int h) +{ + qreal aspect = qreal(w) / qreal(h ? h : 1); + const qreal zNear = 0.0, zFar = 100.0, fov = 45.0; + m_projection.setToIdentity(); + m_projection.perspective(fov, aspect, zNear, zFar); + + if (m_initialized) + glViewport(0, 0, w, h); +} |