QML和OpenGL混合渲染（源代码）

// Cube.cpp #include "Cube.h" Cube::Cube( void ): m_VertexBuffer( QOpenGLBuffer::VertexBuffer ), m_IndexBuffer( QOpenGLBuffer::IndexBuffer ), m_ColorBuffer( QOpenGLBuffer::VertexBuffer ), m_RotateAngle( 0.0f ), m_Axis( 1.0f, 1.0f, 0.0f ) { // 初始化 connect( this, SIGNAL( windowChanged( QQuickWindow* ) ), this, SLOT( OnWindowChanged( QQuickWindow* ) ) ); } void Cube::OnWindowChanged( QQuickWindow* pWindow ) { if ( pWindow == Q_NULLPTR ) return; connect( pWindow, SIGNAL( beforeRendering( ) ), this, SLOT( Render( ) ), Qt::DirectConnection ); pWindow->setClearBeforeRendering( false ); } void Cube::Render( void ) { static bool runOnce = RunOnce( ); Q_UNUSED( runOnce ); // 运动 m_ModelViewMatrix.setToIdentity( ); m_ModelViewMatrix.translate( 0.0f, 0.0f, -60.0f ); m_ModelViewMatrix.rotate( m_RotateAngle, m_Axis.x( ), m_Axis.y( ), m_Axis.z( ) ); // 渲染 glViewport( 0, 0, window( )->width( ), window( )->height( ) ); glClearColor( 0.0f, 0.0f, 0.0f, 1.0f ); glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glEnable( GL_DEPTH_TEST ); glEnable( GL_CULL_FACE ); glFrontFace( GL_CW ); m_ShaderProgram.bind( ); m_VertexBuffer.bind( ); int posLoc = m_ShaderProgram.attributeLocation( "position" ); m_ShaderProgram.enableAttributeArray( posLoc ); m_ShaderProgram.setAttributeBuffer( posLoc, // 位置 GL_FLOAT, // 类型 0, // 偏移 3, // 元大小 0 ); // 迈 m_ColorBuffer.bind( ); int colorLoc = m_ShaderProgram.attributeLocation( "color" ); m_ShaderProgram.enableAttributeArray( colorLoc ); m_ShaderProgram.setAttributeBuffer( colorLoc, // 位置 GL_FLOAT, // 类型 0, // 偏移 4, // 元大小 0 ); // 迈 m_IndexBuffer.bind( ); m_ShaderProgram.setUniformValue( "modelViewMatrix", m_ModelViewMatrix ); m_ShaderProgram.setUniformValue( "projectionMatrix", m_ProjectionMatrix ); glDrawElements( GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, Q_NULLPTR ); m_ShaderProgram.disableAttributeArray( posLoc ); m_ShaderProgram.disableAttributeArray( colorLoc ); m_IndexBuffer.release( ); m_VertexBuffer.release( ); m_ShaderProgram.release( ); } bool Cube::RunOnce( void ) { // 初始化着色器 m_ShaderProgram.addShaderFromSourceFile( QOpenGLShader::Vertex, ":/shader/Shader.vsh" ); m_ShaderProgram.addShaderFromSourceFile( QOpenGLShader::Fragment, ":/shader/Shader.fsh" ); m_ShaderProgram.link( ); // 初始化顶点缓存 const GLfloat length = 10.0f; const GLfloat vertices[] = { length, -length, length, length, -length, -length, -length, -length, -length, -length, -length, length, length, length, length, length, length, -length, -length, length, -length, -length, length, length }; m_VertexBuffer.setUsagePattern( QOpenGLBuffer::StaticDraw ); m_VertexBuffer.create( ); m_VertexBuffer.bind( ); m_VertexBuffer.allocate( vertices, sizeof( vertices ) ); // 初始化颜色的缓存 const GLfloat colors[] = { 1.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f }; m_ColorBuffer.setUsagePattern( QOpenGLBuffer::StaticDraw ); m_ColorBuffer.create( ); m_ColorBuffer.bind( ); m_ColorBuffer.allocate( colors, sizeof( colors ) ); // 初始化索引缓存 GLubyte indices[] = { 0, 1, 2, 0, 2, 3,// 下面 7, 6, 4, 6, 5, 4,// 上面 7, 4, 3, 4, 0, 3,// 左面 5, 6, 1, 6, 2, 1,// 右面 4, 5, 0, 5, 1, 0,// 前面 3, 2, 6, 3, 6, 7,// 背面 }; m_IndexBuffer.setUsagePattern( QOpenGLBuffer::StaticDraw ); m_IndexBuffer.create( ); m_IndexBuffer.bind( ); m_IndexBuffer.allocate( indices, sizeof( indices ) ); // 设定模型矩阵和投影矩阵 float aspectRatio = float( window( )->width( ) ) / float( window( )->height( ) ); m_ProjectionMatrix.perspective( 45.0f, aspectRatio, 0.5f, 500.0f ); connect( window( )->openglContext( ), SIGNAL( aboutToBeDestroyed( ) ), this, SLOT( Release( ) ), Qt::DirectConnection ); return true; } void Cube::Release( void ) { qDebug( "Vertex buffer and index buffer are to be destoryed." ); m_VertexBuffer.destroy( ); m_IndexBuffer.destroy( ); m_ColorBuffer.destroy( ); }