关于opengl源码的有关问题

关于opengl源码的问题
gluPickMatrix函数的实现在哪？我在glut源码中找了半天没有找到

[解决办法]
这是vtk glu里面的代码

C/C++ code

// This function was copied from Mesa and sets up the pick matrixinline void vtkgluPickMatrix( GLdouble x, GLdouble y,                              GLdouble width, GLdouble height,                              int *origin, int *size ){  GLfloat m[16];  GLfloat sx, sy;  GLfloat tx, ty;  sx = size[0] / width;  sy = size[1] / height;  tx = (size[0] + 2.0 * (origin[0] - x)) / width;  ty = (size[1] + 2.0 * (origin[1] - y)) / height;#define M(row,col)  m[col*4+row]   M(0,0) = sx;   M(0,1) = 0.0;  M(0,2) = 0.0;  M(0,3) = tx;   M(1,0) = 0.0;  M(1,1) = sy;   M(1,2) = 0.0;  M(1,3) = ty;   M(2,0) = 0.0;  M(2,1) = 0.0;  M(2,2) = 1.0;  M(2,3) = 0.0;   M(3,0) = 0.0;  M(3,1) = 0.0;  M(3,2) = 0.0;  M(3,3) = 1.0;#undef M   glMultMatrixf( m );}#endif
[解决办法]
楼主，你看看这篇文章就知道源码是怎样的了

http://blog.csdn.net/zhangci226/archive/2009/10/30/4749526.aspx