Qt|OpenGL-天空盒子的创建

程序运行截图如下：

源码如下：

myglwidget.h

#ifndef MYGLWIDGET_H
#define MYGLWIDGET_H#include <QOpenGLWidget>
#include <QWidget>
class SkyBox;class MyGLWidget : public QOpenGLWidget
{Q_OBJECT
public:explicit MyGLWidget(QWidget *parent = 0);SkyBox *m_skybox;double m_axle_X;double m_axle_Y;double m_rotate_value;int m_verticalValue;public slots:protected:void initializeGL();void resizeGL(int w,int h);void paintGL();
};#endif // MYGLWIDGET_H

skybox.h

#ifndef SKYBOX_H
#define SKYBOX_H#include <GL/gl.h>
#include <GL/glu.h>
#include <QString>
class QImage;class SkyBox
{
public:SkyBox();void draw();void Init();
protected:GLuint CreateTexture2DFromBMP(const char*bmpPath);unsigned char * LoadFileContent(const char *path, int &filesize);unsigned char *DecodeBMP(unsigned char*bmpFileData, int&width, int&height);GLuint createTexture2D(unsigned char *piexlData, int width, int height, GLenum type);
private:GLuint m_textures[6];};#endif // SKYBOX_H

widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>namespace Ui {
class Widget;
}class Widget : public QWidget
{Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();public slots:void upBtnClicked();void downBtnClicked();void leftBtnClicked();void rightBtnClicked();private:Ui::Widget *ui;
};#endif // WIDGET_H

main.cpp

#include "widget.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;w.show();return a.exec();
}

myglwidget.cpp

#include "myglwidget.h"
#include <GL/glu.h>
#include <QDebug>
#include "skybox.h"MyGLWidget::MyGLWidget(QWidget *parent) : QOpenGLWidget(parent)
{m_skybox=new SkyBox;m_axle_X=0.0;m_axle_Y=0.0;m_rotate_value=0.0;m_verticalValue=0;
}void MyGLWidget::initializeGL()
{glMatrixMode(GL_PROJECTION);gluPerspective(50.0f,800.0f/600.0f,0.1f,1000.0f);glMatrixMode(GL_MODELVIEW);glLoadIdentity();m_skybox->Init();
}void MyGLWidget::resizeGL(int w, int h)
{Q_UNUSED(w)Q_UNUSED(h)
}void MyGLWidget::paintGL()
{glClearColor(0.0f,0.0f,0.0f,1.0f);glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);m_skybox->draw();if(m_axle_X==1){if(m_verticalValue>=90||m_verticalValue<=-90){return;}}glRotatef(m_rotate_value,m_axle_X,m_axle_Y,0.0);
}

skybox.cpp

#include "skybox.h"
#include <QImage>
#include <QDebug>
#include <QFile>SkyBox::SkyBox()
{}void SkyBox::draw()
{glDisable(GL_DEPTH_TEST);glEnable(GL_TEXTURE_2D);glBindTexture(GL_TEXTURE_2D, m_textures[0]);glBegin(GL_QUADS);glColor4ub(255,255,255,255);glTexCoord2f(0.0f,0.0f);glVertex3f(-0.5f,-0.5f,-0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(0.5f,-0.5f,-0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(0.5f,0.5f,-0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(-0.5f,0.5f,-0.5f);glEnd();glBindTexture(GL_TEXTURE_2D, m_textures[1]);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f);glVertex3f(0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(-0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(-0.5f,0.5f,0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(0.5f,0.5f,0.5f);glEnd();glBindTexture(GL_TEXTURE_2D, m_textures[2]);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f);glVertex3f(-0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(-0.5f,-0.5f,-0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(-0.5f,0.5f,-0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(-0.5f,0.5f,0.5f);glEnd();glBindTexture(GL_TEXTURE_2D, m_textures[3]);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f);glVertex3f(0.5f,-0.5f,-0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(0.5f,0.5f, 0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(0.5f,0.5f,-0.5f);glEnd();glBindTexture(GL_TEXTURE_2D, m_textures[4]);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f);glVertex3f(-0.5f,0.5f,-0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(0.5f,0.5f,-0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(0.5f,0.5f,0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(-0.5f,0.5f,0.5f);glEnd();glBindTexture(GL_TEXTURE_2D,m_textures[5]);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f);glVertex3f(-0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,0.0f);glVertex3f(0.5f,-0.5f,0.5f);glTexCoord2f(1.0f,1.0f);glVertex3f(0.5f,-0.5f,-0.5f);glTexCoord2f(0.0f,1.0f);glVertex3f(-0.5f,-0.5f,-0.5f);glEnd();
}void SkyBox::Init()
{m_textures[0]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\front.bmp");m_textures[1]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\back.bmp");m_textures[2]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\left.bmp");m_textures[3]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\right.bmp");m_textures[4]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\top.bmp");m_textures[5]=CreateTexture2DFromBMP("E:\\Qt2018\\SkyOpenGL\\Res\\bottom.bmp");
}GLuint SkyBox::CreateTexture2DFromBMP(const char *bmpPath)
{int nFileSize=0;unsigned char *bmpFileContent=LoadFileContent(bmpPath,nFileSize);if (bmpFileContent==nullptr){return 0;}int bmpWidth=0,bmpHeight=0;unsigned char*pixelData=DecodeBMP(bmpFileContent,bmpWidth,bmpHeight);if (bmpWidth==0){delete bmpFileContent;return 0;}GLuint texture=createTexture2D(pixelData,bmpWidth,bmpHeight,GL_RGB);delete bmpFileContent;return texture;
}unsigned char *SkyBox::LoadFileContent(const char *path,int &filesize)
{unsigned char*fileContent=nullptr;filesize=0;FILE*pFile=fopen(path,"rb");if(pFile){fseek(pFile,0,SEEK_END);int nLen=ftell(pFile);if(nLen>0){rewind(pFile);fileContent=new unsigned char[nLen + 1];fread(fileContent,sizeof(unsigned char),nLen,pFile);fileContent[nLen] ='\0';filesize=nLen;}fclose(pFile);}return fileContent;
}unsigned char *SkyBox::DecodeBMP(unsigned char *bmpFileData,int &width,int &height)
{if (0x4D42==*((unsigned short*)bmpFileData)){int pixelDataOffset=*((int*)(bmpFileData+10));width=*((int*)(bmpFileData+18));height=*((int*)(bmpFileData+22));unsigned char*pixelData=bmpFileData+pixelDataOffset;for (int i=0;i<width*height*3;i+=3){unsigned char temp=pixelData[i];pixelData[i]=pixelData[i+2];pixelData[i+2]=temp;}return pixelData;}return nullptr;
}GLuint SkyBox::createTexture2D(unsigned char *piexlData, int width, int height, GLenum type)
{GLuint texture;glGenTextures(1,&texture);glBindTexture(GL_TEXTURE_2D,texture);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);glTexImage2D(GL_TEXTURE_2D,0,type,width,height,0,type,GL_UNSIGNED_BYTE,piexlData);return texture;
}

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include "skybox.h"Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget)
{ui->setupUi(this);connect(ui->upPushButton,SIGNAL(clicked(bool)),this,SLOT(upBtnClicked()));connect(ui->downPushButton,SIGNAL(clicked(bool)),this,SLOT(downBtnClicked()));connect(ui->leftPushButton,SIGNAL(clicked(bool)),this,SLOT(leftBtnClicked()));connect(ui->rightPushButton,SIGNAL(clicked(bool)),this,SLOT(rightBtnClicked()));
}Widget::~Widget()
{delete ui;
}void Widget::upBtnClicked()
{ui->openGLWidget->m_axle_X=1.0;ui->openGLWidget->m_axle_Y=0.0;ui->openGLWidget->m_rotate_value=-2.0;ui->openGLWidget->m_verticalValue+=1;ui->openGLWidget->update();
}void Widget::downBtnClicked()
{ui->openGLWidget->m_axle_X=1.0;ui->openGLWidget->m_axle_Y=0.0;ui->openGLWidget->m_rotate_value=2.0;ui->openGLWidget->m_verticalValue-=1;ui->openGLWidget->update();
}void Widget::leftBtnClicked()
{ui->openGLWidget->m_axle_X=0.0;ui->openGLWidget->m_axle_Y=1.0;ui->openGLWidget->m_rotate_value=-2.0;ui->openGLWidget->update();
}void Widget::rightBtnClicked()
{ui->openGLWidget->m_axle_X=0.0;ui->openGLWidget->m_axle_Y=1.0;ui->openGLWidget->m_rotate_value=2.0;ui->openGLWidget->update();
}

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