void g3d_frustum(float left, float right, float bottom, float top, float znear, float zfar);
void g3d_perspective(float vfov, float aspect, float znear, float zfar);
void g3d_frustum(float left, float right, float bottom, float top, float znear, float zfar);
void g3d_perspective(float vfov, float aspect, float znear, float zfar);