QtOpenGL以及Graphics-View框架整合的例子（演示程序+源代码）

/* ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ * ┃ ┏━┣━┣┓　　┏┓┏┓┳┓┏━━┓┣┣━┓　┓　┓┣┳━┓ ┃ * ┃ ┏┏┏╯━┓┳┳━┛┏╯┃┃┃　　┃┣┣━┓┃┃　┃┃┃　　 ┃ * ┃ ┃┃┏━╮┃┗┗┏╯┗┃┃╯┃　　┃┏┣━┓┃┃　┃╯┣━┓ ┃ * ┃ ╰┫┏━┻╯┗┳┣┛┏┛┃┃┣━━┫┃┃　┃┃┃┗╯　┃　　 ┃ * ┃ ┏┫━┳━┫┏┃┣┓┗┃┃╯┃　　┃┃┃　┃　┃　┃　┣━┓ ┃ * ┃ ┗┗┗━━╯┗┛┛╯┗╯╰　┗━━╯　┛　┛┗╯　╰┛┗　　 ┃ * ┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫ * ┃ Copyright (c) 2013 jiangcaiyang ┃ * ┃ This software is provided 'as-is', without any express or implied ┃ * ┃ warranty. In no event will the authors be held liable for any damages ┃ * ┃ arising from the use of this software. ┃ * ┃ ┃ * ┃ Permission is granted to anyone to use this software for any purpose, ┃ * ┃ including commercial applications, and to alter it and redistribute it ┃ * ┃ freely, subject to the following restrictions: ┃ * ┃ ┃ * ┃ 1. The origin of this software must not be misrepresented; you must ┃ * ┃ not claim that you wrote the original software. If you use this ┃ * ┃ software in a product, an acknowledgment in the product ┃ * ┃ documentation would be appreciated but is not required. ┃ * ┃ 2. Altered source versions must be plainly marked as such, and must ┃ * ┃ not be misrepresented as being the original software. ┃ * ┃ 3. This notice may not be removed or altered from any source ┃ * ┃ distribution. ┃ * ┃ ┃ * ┃ jiangcaiyang jiangcaiyang123@163.com ┃ * ┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫ * ┃ file name: OpenGLView.cpp ┃ * ┃ create date: 2013年9月24日星期二 19时33分16秒 ┃ * ┃ last modified date: 2013年9月24日星期二 22时12分23秒 ┃ * ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛ */ #include <cmath> #include <QMatrix4x4> #include <QtOpenGL> #include <QResizeEvent> #include <QMouseEvent> #include <QWheelEvent> #include <QPainter> #include <QMessageBox> #include "OpenGLView.h" /*---------------------------------------------------------------------------*/ bool g_ShowAxis = false; /*---------------------------------------------------------------------------*/ void OpenGLView::PaintGL( void ) { glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glPushMatrix( ); m_Camera.Apply( ); m_3DS.RenderGL( ); if ( g_ShowAxis ) DrawAxis( ); glPopMatrix( ); } /*---------------------------------------------------------------------------*/ void OpenGLView::DrawAxis( void ) { static const qint32 s_Scale = 64; m_pShaderProgram->release( );// 绘制坐标轴不需要着色器 glPushAttrib( GL_LINE_BIT ); glLineWidth( 1.0f ); glBegin( GL_LINES ); // X轴 glColor3ub( 255, 0, 0 ); glVertex3i( 0, 0, 0 ); glVertex3i( s_Scale, 0, 0 ); // Y轴 glColor3ub( 0, 255, 0 ); glVertex3i( 0, 0, 0 ); glVertex3i( 0, s_Scale, 0 ); // Z轴 glColor3ub( 0, 0, 255 ); glVertex3i( 0, 0, 0 ); glVertex3i( 0, 0, s_Scale ); glEnd( ); glPopAttrib( ); m_pShaderProgram->bind( );// 开启着色器 } /*---------------------------------------------------------------------------*/ void PopupError( const QString& info ) { QString header = QObject::tr( "Sorry but there are some errors in using shaders.\n" "Here are some useful information:\n" ); QMessageBox::warning( Q_NULLPTR, QObject::tr( "Shader program error" ), header + info ); } #define CHECK( stmt, info ) \ if ( !stmt )\ {\ PopupError( info );\ return false;\ } /*---------------------------------------------------------------------------*/ OpenGLView::OpenGLView( QWidget* pParent ): QGraphicsView( pParent ) { m_Camera.SetPos( QVector3D( 0.0, 0.0, 20.0 ) );// 设置摄像机坐标 m_3DS.Load( ":/Model/Various.3ds" ); } /*---------------------------------------------------------------------------*/ OpenGLView::~OpenGLView( void ) { m_pShaderProgram->release( ); m_pShaderProgram->removeShader( m_pVertexShader ); if ( m_pVertexShader != Q_NULLPTR ) delete m_pVertexShader; if ( m_pShaderProgram != Q_NULLPTR ) delete m_pShaderProgram; } /*---------------------------------------------------------------------------*/ void OpenGLView::setScene( GraphicsScene* pScene ) { pScene->SetCamera( &m_Camera ); QGraphicsView::setScene( pScene ); } /*---------------------------------------------------------------------------*/ bool OpenGLView::SetupShaders( void ) { // 初始化着色器 m_pShaderProgram = new QOpenGLShaderProgram( viewport( ) ); m_pVertexShader = new QOpenGLShader( QOpenGLShader::Vertex, m_pShaderProgram ); // 先假装添加一下着色器，然后调用SwitchShader()函数走常规路线 CHECK( m_pShaderProgram->addShader( m_pVertexShader ), m_pShaderProgram->log( ) ); return SwitchShader( ":/Shader/Diffuse.vert" ); } /*---------------------------------------------------------------------------*/ bool OpenGLView::SwitchShader( const QString& shaderFileName ) { m_pShaderProgram->release( ); m_pShaderProgram->removeShader( m_pVertexShader ); // 重新编译着色器、连接至着色器程序最后使用它 CHECK( m_pVertexShader->compileSourceFile( shaderFileName ), m_pVertexShader->log( ) ); CHECK( m_pShaderProgram->addShader( m_pVertexShader ), m_pShaderProgram->log( ) ); CHECK( m_pShaderProgram->link( ), m_pShaderProgram->log( ) ); SetLightPos( ); return true; } /*---------------------------------------------------------------------------*/ void OpenGLView::SetLightPos( const QVector3D& lightPos ) { static QVector3D s_LightPos( 30.0f, 30.0f, 30.0f ); if ( !lightPos.isNull( ) ) { s_LightPos = lightPos; } if ( m_pShaderProgram != Q_NULLPTR && m_pShaderProgram->isLinked( ) ) { m_pShaderProgram->bind( ); m_pShaderProgram->setUniformValue( "lightPos", s_LightPos ); m_pShaderProgram->release( ); } } /*---------------------------------------------------------------------------*/ void OpenGLView::InitGL( void ) { glEnable( GL_MULTISAMPLE ); glEnable( GL_DEPTH_TEST ); glClearColor( 0.0, 0.0, 0.0, 1.0 ); static bool runOnce = SetupShaders( ); Q_UNUSED( runOnce ); m_pShaderProgram->bind( ); } /*---------------------------------------------------------------------------*/ void OpenGLView::resizeEvent( QResizeEvent* pEvent ) { scene( )->setSceneRect( 0.0,