NeHe教程Qt实现——lesson12

NeHe 系列教程之十二： 显示列表

英文教程地址：lesson12

本课主要演示了显示列表的使用。代码基于第六课。

显示列表的主要接口：

glGenLists

glNewList

glCallList

具体来看代码中的使用：

namespace {    ...    static GLfloat boxcol[5][3]=     // Array For Box Colors    {        // Bright:  Red, Orange, Yellow, Green, Blue        {1.0f,0.0f,0.0f},{1.0f,0.5f,0.0f},{1.0f,1.0f,0.0f},{0.0f,1.0f,0.0f},{0.0f,1.0f,1.0f}    };    static GLfloat topcol[5][3]=     // Array For Top Colors    {        // Dark:  Red, Orange, Yellow, Green, Blue        {.5f,0.0f,0.0f},{0.5f,0.25f,0.0f},{0.5f,0.5f,0.0f},{0.0f,0.5f,0.0f},{0.0f,0.5f,0.5f}    };    GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f };             // Ambient Light Values ( NEW )    GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f };              // Diffuse Light Values ( NEW )    GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f };            // Light Position ( NEW )    GLvoid BuildLists()             // Build Box Display List    {        box=glGenLists(2);          // Building Two Lists        glNewList(box,GL_COMPILE);       // New Compiled box Display List        glBegin(GL_QUADS);            // Front Face            glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);  // Bottom Left Of The Texture and Quad            glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);  // Bottom Right Of The Texture and Quad            glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);  // Top Right Of The Texture and Quad            glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);  // Top Left Of The Texture and Quad            // Back Face            glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);  // Bottom Right Of The Texture and Quad            glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);  // Top Right Of The Texture and Quad            glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);  // Top Left Of The Texture and Quad            glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);  // Bottom Left Of The Texture and Quad            // Top Face            glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);  // Top Left Of The Texture and Quad            glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f);  // Bottom Left Of The Texture and Quad            glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);  // Bottom Right Of The Texture and Quad            glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);  // Top Right Of The Texture and Quad            // Bottom Face            glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);  // Top Right Of The Texture and Quad            glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);  // Top Left Of The Texture and Quad            glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);  // Bottom Left Of The Texture and Quad            glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);  // Bottom Right Of The Texture and Quad            // Right face            glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);  // Bottom Right Of The Texture and Quad            glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);  // Top Right Of The Texture and Quad            glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);  // Top Left Of The Texture and Quad            glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);  // Bottom Left Of The Texture and Quad            // Left Face            glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);  // Bottom Left Of The Texture and Quad            glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);  // Bottom Right Of The Texture and Quad            glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);  // Top Right Of The Texture and Quad            glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);  // Top Left Of The Texture and Quad        glEnd();        glEndList();        top = box + 1;        glNewList(top,GL_COMPILE);        // Top Face        glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);  // Top Left Of The Texture and Quad        glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f);  // Bottom Left Of The Texture and Quad        glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);  // Bottom Right Of The Texture and Quad        glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);  // Top Right Of The Texture and Quad        glEndList();    }}

最后 我们再看在绘制代码中的使用：

void MyGLWidget::paintGL(){    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);  // Clear The Screen And The Depth Buffer    glLoadIdentity();       // Reset The Current Modelview Matrix    glTranslatef(0.0f,0.0f,-5.0f);       // Move Into The Screen 5 Units    glBindTexture(GL_TEXTURE_2D, texture[0]);       // Select Our Texture    for (yloop=1;yloop<6;yloop++) {        for (xloop=0;xloop<yloop;xloop++) {            glLoadIdentity();            glTranslatef(1.4f+(float(xloop)*2.8f)-(float(yloop)*1.4f),((6.0f-float(yloop))*2.4f)-7.0f,-20.0f);            glRotatef(45.0f-(2.0f*yloop)+xrot,1.0f,0.0f,0.0f);      // Tilt The Cubes Up And Down            glRotatef(45.0f+yrot,0.0f,1.0f,0.0f);               // Spin Cubes Left And Right            glColor3fv(boxcol[yloop-1]);                    // Select A Box Color            glCallList(box);            glColor3fv(topcol[yloop-1]);                    // Select The Top Color            glCallList(top);                        // Draw The Top        }    }    xrot += 0.3f;                             // X Axis Rotation    yrot += 0.2f;                             // Y Axis Rotation}

运行效果如下图所示：