利用GPGPU方法将大量数据通过纹理传输至GPU进行计算

#include <QApplication> #include <QFile> #include <QKeyEvent> #include <QSurfaceFormat> #include <QOpenGLContext> #include "GLWindow.h" /*---------------------------------------------------------------------------*/ GLWindow::GLWindow( QWindow* pParent ): QWindow( pParent ), m_Texture( QOpenGLTexture::Target2D ), m_VertexBuffer( QOpenGLBuffer::VertexBuffer ), m_pContext( Q_NULLPTR ) { setSurfaceType( OpenGLSurface ); resize( 640, 360 ); setTitle( tr( "GPGPU OpenGL Texture 2" ) ); connect( qApp, SIGNAL( lastWindowClosed( ) ), this, SLOT( onClose( ) ) ); } /*---------------------------------------------------------------------------*/ void GLWindow::exposeEvent( QExposeEvent* pEvent ) { Q_UNUSED( pEvent ); if ( m_pContext == Q_NULLPTR ) { QSurfaceFormat format; m_pContext = new QOpenGLContext( this ); m_pContext->setFormat( format ); m_pContext->create( ); m_pContext->makeCurrent( this ); initializeOpenGLFunctions( ); InitGL( ); } else m_pContext->makeCurrent( this ); ResizeGL( width( ), height( ) ); RenderGL( ); m_pContext->swapBuffers( this ); } /*---------------------------------------------------------------------------*/ void GLWindow::keyPressEvent( QKeyEvent *pEvent ) { Q_UNUSED( pEvent ); m_Colors.clear( ); m_Colors.append( 0.4f ); m_Colors.append( 0.5f ); m_Colors.append( 0.9f ); m_Colors.append( 0.9f ); m_Texture.setData( QOpenGLTexture::Luminance, QOpenGLTexture::Float32, m_Colors.data( ) ); QCoreApplication::postEvent( this, new QEvent( QEvent::UpdateRequest ) ); } /*---------------------------------------------------------------------------*/ void GLWindow::onClose( void ) { ReleaseGL( ); } /*---------------------------------------------------------------------------*/ void GLWindow::InitGL( void ) { float vertices[] = { 0.2f, 0.2f, 0.0f, 1.0f, 0.2f, 0.8f, 0.0f, 1.0f, 0.8f, 0.2f, 0.0f, 1.0f, 0.8f, 0.8f, 0.0f, 1.0f }; m_Colors.append( 0.8f ); m_Colors.append( 0.5f ); m_Colors.append( 0.2f ); m_Colors.append( 0.9f ); m_Texture.setMagnificationFilter( QOpenGLTexture::Nearest ); m_Texture.setMinificationFilter( QOpenGLTexture::Nearest ); m_Texture.setSize( 4, 1 ); m_Texture.setFormat( QOpenGLTexture::LuminanceFormat ); m_Texture.allocateStorage( ); m_Texture.setData( QOpenGLTexture::Luminance, QOpenGLTexture::Float32, m_Colors.data( ) ); m_VertexBuffer.setUsagePattern( QOpenGLBuffer::StaticDraw ); m_VertexBuffer.create( ); m_VertexBuffer.bind( ); m_VertexBuffer.allocate( vertices, sizeof( vertices ) ); m_ShaderProgram.addShaderFromSourceFile( QOpenGLShader::Vertex, ":/Texture.vsh" ); m_ShaderProgram.addShaderFromSourceFile( QOpenGLShader::Fragment, ":/Texture.fsh" ); m_ShaderProgram.link( ); } /*---------------------------------------------------------------------------*/ void GLWindow::ResizeGL( int width, int height ) { glViewport( 0, 0, width, height ); } /*---------------------------------------------------------------------------*/ void GLWindow::RenderGL( void ) { glClearColor( 0.2f, 0.5f, 0.8f, 1.0f ); glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); m_ShaderProgram.bind( ); m_VertexBuffer.bind( ); int positionLoc = m_ShaderProgram.attributeLocation( "position" ); m_ShaderProgram.enableAttributeArray( positionLoc ); m_ShaderProgram.setAttributeBuffer( "position", GL_FLOAT, 0, 4 ); glVertexAttribPointer( positionLoc, // 属性在着色器中的位置 4, // 属性的个数 GL_FLOAT, // 属性的类型 GL_FALSE, // 属性是否被单位化 0, // 跨度（又称迈） Q_NULLPTR ); // 属性指针（如果绑定VBO，那么此项为空） glActiveTexture( GL_TEXTURE0 ); m_Texture.bind( ); m_ShaderProgram.setUniformValue( "texID", 0 ); m_ShaderProgram.setUniformValue( "texSize", m_Colors.size( ) ); glDrawArrays( GL_TRIANGLE_STRIP, 0, 4 );// 绘图 m_Texture.release( ); m_VertexBuffer.release( ); m_ShaderProgram.release( ); } /*---------------------------------------------------------------------------*/ void GLWindow::ReleaseGL( void ) { }