Question

将下面代码用OpenGL顶点数组实现

glBegin (GL_TRIANGLES);
for(int i=0;i<(sizeof(face_indicies)/sizeof(face_indicies[0]));i++)
{
for(int j=0;j<3;j++)
{
int idx=face_indicies[i][j];
glNormal3fv(&normals[idx][0]);
glVertex3fv(&vertices[idx][0]);
}
}
glEnd ();

Answer 1

//初始化
glEnableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_VERTEX_ARRAY);
glNormalPointer(GL_FLOAT,0,normals); //float normals[][3]
glVertexPointer(3,GL_FLOAT,0,vertices); //float vertices[][3]
...
//显示
...
for(int j=0;j<3;j++)
{
int idx=face_indicies[i][j];
// glNormal3fv(&normals[idx][0]);
// glVertex3fv(&vertices[idx][0]);
glArrayElement(idx);//获取当前所有已启用数组的一个顶点数据
}
------
或者把glBegin到End以及2个for替换成
glDrawElements(GL_TRIANGLES,
(sizeof(face_indicies)/sizeof(**face_indicies),
GL_UNSIGNED_INT, // unsigned int face_indicies[][]
face_indicies);