55 lines
2.0 KiB
C++
55 lines
2.0 KiB
C++
#include<hgl/graph/Camera.h>
|
||
namespace hgl
|
||
{
|
||
namespace graph
|
||
{
|
||
template<typename V>
|
||
inline Matrix4f LookAt(const V &eye,const V &target,const V &up)
|
||
{
|
||
V forward=target-eye;
|
||
|
||
normalize(forward);
|
||
|
||
V side=cross(forward,up);
|
||
|
||
normalize(side);
|
||
|
||
V nup=cross(side,forward);
|
||
|
||
Matrix4f result( side.x, side.y, side.z, 1.0f,
|
||
nup.x, nup.y, nup.z, 1.0f,
|
||
-forward.x, -forward.y, -forward.z/2.0f, 1.0f,
|
||
0.0f, 0.0f, 0.0f, 1.0f);
|
||
// ^^^^^^
|
||
// 某些引擎此项为0.5，这个会影响最终输出的z值，但我们这里必须为0
|
||
|
||
return result*translate(-eye.xyz());
|
||
}
|
||
|
||
void Camera::Refresh()
|
||
{
|
||
if(type==CameraType::Perspective)
|
||
matrix.projection=perspective(fov,width/height,znear,zfar);
|
||
else
|
||
matrix.projection=ortho(width,height,znear,zfar); //这个算的不对
|
||
|
||
//matrix.inverse_projection=matrix.projection.Inverted();
|
||
|
||
matrix.modelview=hgl::graph::LookAt(eye,center,up_vector);
|
||
//matrix.modelview=Matrix4f::LookAt(eye.xyz(),center.xyz(),forward_vector.xyz(),up_vector.xyz(),up_vector.xyz());
|
||
|
||
matrix.mvp=matrix.projection*matrix.modelview;
|
||
|
||
//注意： C++中要 projection * model_view * local_to_world * position
|
||
//而GLSL中要 position * local_to_world * model_view * projection
|
||
|
||
matrix.ortho=ortho(width,height,znear,zfar);
|
||
|
||
matrix.view_pos=eye;
|
||
|
||
frustum.SetVerticalFovAndAspectRatio(DegToRad(fov),width/height);
|
||
frustum.SetViewPlaneDistances(znear,zfar);
|
||
}
|
||
}//namespace graph
|
||
}//namespace hgl
|