本文對(duì)第11篇文章進(jìn)行修改，使用顯示列表來(lái)存儲(chǔ)渲染命令。
顯示列表
OpenGL provides a facility to create a preprocessed set of OpenGL commands called a display list. Creating a display list is a straight forward process. We just have to delimit the display list code with glNewList and glEndList. The display list is named by an integer and this name is used to call the list to be executed later on. Display lists are very useful for scenes which have lot of geometry that don't change in from frame to frame. If we have to rerender something that doesn't change it is not worth going through all the calculations required once again - it is better to store them somewhere in memory and reuse it. This is exactly what the display list lets us achieve. Thus if we are going to repeatedly execute the same sequence of OpenGL commands we can create and store a display list and then have this cached sequence of calls repeated with minimal overhead, since all the vertices, lighting calculations, textures and matrix operations are calculated only when the list is created and not when it is replayed. Only the results of the calculations end up being stored in display lists. This means we cannot modify the list once we create it.
1,CY457OpenGLView類中加入一個(gè)變量來(lái)保存顯示列表名稱
GLuint m_sceneList;
2,創(chuàng)建顯示列表
void CCY457OpenGLView::CreateSceneList()
{//創(chuàng)建顯示列表
m_sceneList = glGenLists(1);
glNewList(m_sceneList, GL_COMPILE);
SetupLighting();
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D,m_Texture[0]);
//Front Face
glBegin(GL_POLYGON);
glTexCoord2f(0,0);
glVertex3f(-1.0f,-1.0f,0.0f);
glTexCoord2f(1,0);
glVertex3f( 1.0f,-1.0f,0.0f);
glTexCoord2f(1,1);
glVertex3f( 1.0f, 1.0f,0.0f);
glTexCoord2f(0,1);
glVertex3f(-1.0f, 1.0f,0.0f);
glEnd();
//Back Face
glBegin(GL_POLYGON);
glTexCoord2f(1,0);
glVertex3f(-1.0f,-1.0f,-1.0f);
glTexCoord2f(1,1);
glVertex3f(-1.0f, 1.0f,-1.0f);
glTexCoord2f(0,1);
glVertex3f( 1.0f, 1.0f,-1.0f);
glTexCoord2f(0,0);
glVertex3f( 1.0f,-1.0f,-1.0f);
glEnd();
glBindTexture(GL_TEXTURE_2D,m_Texture[1]);
//Left Face
glBegin(GL_POLYGON);
glTexCoord2f(1,0);
glVertex3f(-1.0f,-1.0f, 0.0f);
glTexCoord2f(1,1);
glVertex3f(-1.0f, 1.0f, 0.0f);
glTexCoord2f(0,1);
glVertex3f(-1.0f, 1.0f,-1.0f);
glTexCoord2f(0,0);
glVertex3f(-1.0f,-1.0f,-1.0f);
glEnd();
//Right Face
glBegin(GL_POLYGON);
glTexCoord2f(0,0);
glVertex3f(1.0f,-1.0f, 0.0f);
glTexCoord2f(1,0);
glVertex3f(1.0f,-1.0f,-1.0f);
glTexCoord2f(1,1);
glVertex3f(1.0f, 1.0f,-1.0f);
glTexCoord2f(0,1);
glVertex3f(1.0f, 1.0f, 0.0f);
glEnd();
glBindTexture(GL_TEXTURE_2D,m_Texture[2]);
//Top Face
glBegin(GL_POLYGON);
glTexCoord2f(0,0);
glVertex3f(-1.0f, 1.0f, 0.0f);
glTexCoord2f(0,1);
glVertex3f( 1.0f, 1.0f, 0.0f);
glTexCoord2f(1,1);
glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(1,0);
glVertex3f(-1.0f, 1.0f, -1.0f);
glEnd();
//Botton Face
glBegin(GL_POLYGON);
glTexCoord2f(0,1);
glVertex3f(-1.0f, -1.0f, 0.0f);
glTexCoord2f(0,0);
glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(1,0);
glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(1,1);
glVertex3f( 1.0f, -1.0f, 0.0f);
glEnd();
glDisable(GL_TEXTURE_2D);
glEndList();
}
3，在InitializeOpenGL函數(shù)中加入對(duì)上述函數(shù)的調(diào)用：
//創(chuàng)建顯示列表
CreateSceneList();
4，修改RenderScene的繪制代碼
void CCY457OpenGLView::RenderScene ()
{//繪制函數(shù)
glTranslatef(0.0f,0.0f,-5.0f);
glRotatef(m_xRot,1.0f,0.0f,0.0f);
glRotatef(m_yRot,0.0f,1.0f,0.0f);
glCallList(m_sceneList);
}
原文鏈接：
http://www.cnblogs.com/phinecos/archive/2008/11/06/1328204.html