使用QOpenGLWidget作为容器改进的阴影映射例子

#include <math.h> #include "OpenGLWidget.h" #include "Cube.h" #define VERTEX_COUNT 36 #define CUBE_LENGTH 10.0 #define TEXTURE_UNIT GL_TEXTURE0 #define SHADOW_TEXTURE_UNIT GL_TEXTURE1 QOpenGLShaderProgram* Cube::s_program = Q_NULLPTR; int Cube::s_positionLoc, Cube::s_normalLoc, Cube::s_texCoordLoc, Cube::s_modelMatrixLoc, Cube::s_viewMatrixLoc, Cube::s_projectionMatrixLoc, Cube::s_lightViewProjectionMatrixLoc, Cube::s_lightPositionLoc, Cube::s_modelViewNormalMatrixLoc, Cube::s_shadowTypeLoc, Cube::s_count = 0; Cube::Cube( QMatrix4x4& modelMatrix, const QString& fileName, ShadowType shadowType ): m_modelMatrix( modelMatrix ), m_shadowType( shadowType ), m_vertexBuffer( QOpenGLBuffer::VertexBuffer ), m_texture( QOpenGLTexture::Target2D ) { initializeOpenGLFunctions( ); // 根据创建的次数来创建着色器 if ( s_count++ == 0 ) { s_program = new QOpenGLShaderProgram; s_program->addShaderFromSourceFile( QOpenGLShader::Vertex, ":/Common.vert" ); s_program->addShaderFromSourceFile( QOpenGLShader::Fragment, ":/Common.frag" ); s_program->link( ); s_program->bind( ); s_positionLoc = s_program->attributeLocation( "position" ); s_normalLoc = s_program->attributeLocation( "normal" ); s_texCoordLoc = s_program->attributeLocation( "texCoord" ); s_modelMatrixLoc = s_program->uniformLocation( "modelMatrix" ); s_viewMatrixLoc = s_program->uniformLocation( "viewMatrix" ); s_projectionMatrixLoc = s_program->uniformLocation( "projectionMatrix" ); s_lightPositionLoc = s_program->uniformLocation( "lightPosition" ); s_lightViewProjectionMatrixLoc = s_program->uniformLocation( "lightViewProjectionMatrix" ); s_modelViewNormalMatrixLoc = s_program->uniformLocation( "modelViewNormalMatrix" ); s_shadowTypeLoc = s_program->uniformLocation( "shadowType" ); int textureLoc = s_program->uniformLocation( "texture" ); int shadowLoc = s_program->uniformLocation( "shadowTexture" ); s_program->setUniformValue( textureLoc, TEXTURE_UNIT - GL_TEXTURE0 ); s_program->setUniformValue( shadowLoc, SHADOW_TEXTURE_UNIT - GL_TEXTURE0 ); s_program->release( ); } // 设置顶点坐标 qreal semi = CUBE_LENGTH / 2.0; const QVector3D basicVertices[] = { QVector3D( semi, -semi, semi ), QVector3D( semi, -semi, -semi ), QVector3D( -semi, -semi, -semi ), QVector3D( -semi, -semi, semi ), QVector3D( semi, semi, semi ), QVector3D( semi, semi, -semi ), QVector3D( -semi, semi, -semi ), QVector3D( -semi, semi, semi ) }; const QVector3D normals[] = { QVector3D( 1.0, 0.0, 0.0 ), QVector3D( 0.0, 1.0, 0.0 ), QVector3D( 0.0, 0.0, 1.0 ), QVector3D( -1.0, 0.0, 0.0 ), QVector3D( 0.0, -1.0, 0.0 ), QVector3D( 0.0, 0.0, -1.0 ) }; const QVector2D texCoords[] = { QVector2D( 0.0, 0.0 ), QVector2D( 0.0, 1.0 ), QVector2D( 1.0, 0.0 ), QVector2D( 1.0, 1.0 ) }; m_vertices = new Vertex[VERTEX_COUNT]; Vertex* v = m_vertices; // 前面 v[0].set( basicVertices[7], normals[2], texCoords[2] ); v[1].set( basicVertices[3], normals[2], texCoords[0] ); v[2].set( basicVertices[0], normals[2], texCoords[1] ); v[3].set( basicVertices[4], normals[2], texCoords[3] ); v[4].set( basicVertices[7], normals[2], texCoords[2] ); v[5].set( basicVertices[0], normals[2], texCoords[1] ); // 后面 v[6].set( basicVertices[5], normals[5], texCoords[2] ); v[7].set( basicVertices[2], normals[5], texCoords[1] ); v[8].set( basicVertices[6], normals[5], texCoords[3] ); v[9].set( basicVertices[5], normals[5], texCoords[2] ); v[10].set( basicVertices[1], normals[5], texCoords[0] ); v[11].set( basicVertices[2], normals[5], texCoords[1] ); // 上面 v[12].set( basicVertices[4], normals[1], texCoords[2] ); v[13].set( basicVertices[5], normals[1], texCoords[3] ); v[14].set( basicVertices[6], normals[1], texCoords[1] ); v[15].set( basicVertices[4], normals[1], texCoords[2] ); v[16].set( basicVertices[6], normals[1], texCoords[1] ); v[17].set( basicVertices[7], normals[1], texCoords[0] ); // 下面 v[18].set( basicVertices[0], normals[4], texCoords[3] ); v[19].set( basicVertices[2], normals[4], texCoords[0] ); v[20].set( basicVertices[1], normals[4], texCoords[1] ); v[21].set( basicVertices[0], normals[4], texCoords[3] ); v[22].set( basicVertices[3], normals[4], texCoords[2] ); v[23].set( basicVertices[2], normals[4], texCoords[0] ); // 左面 v[24].set( basicVertices[2], normals[3], texCoords[0] ); v[25].set( basicVertices[3], normals[3], texCoords[1] ); v[26].set( basicVertices[7], normals[3], texCoords[3] ); v[27].set( basicVertices[2], normals[3], texCoords[0] ); v[28].set( basicVertices[7], normals[3], texCoords[3] ); v[29].set( basicVertices[6], normals[3], texCoords[2] ); // 右面 v[30].set( basicVertices[4], normals[0], texCoords[2] ); v[31].set( basicVertices[1], normals[0], texCoords[1] ); v[32].set( basicVertices[5], normals[0], texCoords[3] ); v[33].set( basicVertices[1], normals[0], texCoords[1] ); v[34].set( basicVertices[4], normals[0], texCoords[2] ); v[35].set( basicVertices[0], normals[0], texCoords[0] ); m_vertexBuffer.setUsagePattern( QOpenGLBuffer::DynamicDraw ); m_vertexBuffer.create( ); m_vertexBuffer.bind( ); m_vertexBuffer.allocate( v, VERTEX_COUNT * sizeof( Vertex ) ); m_vertexBuffer.release( ); // 设置纹理滤波 m_texture.setMinificationFilter( QOpenGLTexture::LinearMipMapLinear ); m_texture.setMagnificationFilter( QOpenGLTexture::Linear ); QImage image( fileName ); Q_ASSERT( !fileName.isNull( ) ); m_texture.setData( image ); } Cube::~Cube( void ) { m_vertexBuffer.destroy( ); m_texture.destroy( ); delete []m_vertices; if ( --s_count == 0 ) { delete s_program; } } void Cube::render( OpenGLWidget* widget ) { s_program->bind( ); m_vertexBuffer.bind( ); // 绘制box int offset = 0; setVertexAttribute( s_positionLoc, GL_FLOAT, 3, offset ); offset += 3 * sizeof( GLfloat ); setVertexAttribute( s_normalLoc, GL_FLOAT, 3, offset ); offset += 3 * sizeof( GLfloat ); setVertexAttribute( s_texCoordLoc, GL_FLOAT, 2, offset ); // 摄像机的MVP矩阵 QMatrix4x4& viewMatrix = widget->viewMatrix( ); s_program->setUniformValue( s_modelMatrixLoc, m_modelMatrix ); s_program->setUniformValue( s_viewMatrixLoc, viewMatrix ); s_program->setUniformValue( s_projectionMatrixLoc, widget->projectionMatrix( ) ); s_program->setUniformValue( s_modelViewNormalMatrixLoc, ( viewMatrix * m_modelMatrix ).normalMatrix( ) ); // 是否启用实时阴影 //s_program->setUniformValue( s_shadowTypeLoc, m_shadowType ); m_texture.bind( ); if ( m_shadowType != NoShadow ) { s_program->setUniformValue( s_lightPositionLoc, widget->lightPosition( ) ); s_program->setUniformValue( s_lightViewProjectionMatrixLoc, widget->lightViewProjectionMatrix( ) ); glActiveTexture( SHADOW_TEXTURE_UNIT ); glBindTexture( GL_TEXTURE_2D, widget->shadowTexture( ) ); glDrawArrays( GL_TRIANGLES, 0, VERTEX_COUNT ); glBindTexture( GL_T