43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
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#include<hgl/graph/Camera.h>
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namespace hgl
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{
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namespace graph
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{
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inline Matrix4f LookAt(const Vector3f &eye,const Vector3f &target,const Vector3f &up)
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{
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Vector3f forward=target-eye;
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normalize(forward);
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Vector3f side=cross(forward,up);
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normalize(side);
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Vector3f nup=cross(side,forward);
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Matrix4f result(side.x, side.y, side.z, 0.0f,
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nup.x, nup.y, nup.z, 0.0f,
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-forward.x, -forward.y, -forward.z, 0.0f,
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0.0f, 0.0f, 0.0f, 1.0f);
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return result*translate(-eye);
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}
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void CameraToFrustum(Frustum *f,const Camera *cam)
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{
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if(!f||!cam)return;
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f->SetVerticalFovAndAspectRatio(DegToRad(cam->fov),cam->width/cam->height);
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f->SetViewPlaneDistances(cam->znear,cam->zfar);
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//Matrix4f projection_matrix=f->ProjectionMatrix(); //可以用Frustum来算projection matrix
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}
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void MakeCameraMatrix(Matrix4f *proj,Matrix4f *mv,const Camera *cam)
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{
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*proj=perspective(cam->width/cam->height,cam->fov,cam->znear,cam->zfar);
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*mv=hgl::graph::LookAt(cam->eye,cam->center,cam->up_vector);
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}
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}//namespace graph
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}//namespace hgl
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