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// Copyright 2009-2020 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "../../../common/sys/platform.h"
#include "../../../common/sys/ref.h"
#include "../../../common/math/math.h"
#include "../../../common/math/vec3.h"
#include "../../../common/math/affinespace.h"
#include <sstream>
namespace embree
{
/* camera settings */
struct Camera
{
enum Handedness {
LEFT_HANDED,
RIGHT_HANDED
};
struct ISPCCamera
{
public:
ISPCCamera (const AffineSpace3fa& xfm)
: xfm(xfm) {}
public:
AffineSpace3fa xfm;
};
public:
Camera ()
: from(0.0001f,0.0001f,-3.0f), to(0,0,0), up(0,1,0), fov(90), handedness(RIGHT_HANDED) {}
Camera (Vec3fa& from, Vec3fa& to, Vec3fa& up, float fov, Handedness handedness)
: from(from), to(to), up(up), fov(fov), handedness(handedness) {}
std::string str() const
{
std::stringstream stream;
stream.precision(10);
stream << "--vp " << from.x << " " << from.y << " " << from.z << " "
<< "--vi " << to.x << " " << to.y << " " << to.z << " "
<< "--vu " << up.x << " " << up.y << " " << up.z << " "
<< "--fov " << fov << " "
<< (handedness == LEFT_HANDED ? "--lefthanded" : "--righthanded");
return stream.str();
}
AffineSpace3fa camera2world ()
{
AffineSpace3fa local2world = AffineSpace3fa::lookat(from, to, up);
if (!(local2world == local2world))
throw std::runtime_error("invalid camera specified");
if (handedness == RIGHT_HANDED)
local2world.l.vx = -local2world.l.vx;
return local2world;
}
AffineSpace3fa world2camera () { return rcp(camera2world()); }
Vec3fa world2camera(const Vec3fa& p) { return xfmPoint(world2camera(),p); }
Vec3fa camera2world(const Vec3fa& p) { return xfmPoint(camera2world(),p); }
ISPCCamera getISPCCamera (size_t width, size_t height, bool flip_y = false)
{
const float fovScale = 1.0f/tanf(deg2rad(0.5f*fov));
const AffineSpace3fa local2world = camera2world();
Vec3fa vx = local2world.l.vx;
Vec3fa vy = -local2world.l.vy;
Vec3fa vz = -0.5f*width*local2world.l.vx + 0.5f*height*local2world.l.vy + 0.5f*height*fovScale*local2world.l.vz;
Vec3fa p = local2world.p;
if (flip_y) {
vz = vz+float(height)*vy;
vy = -vy;
}
return ISPCCamera(AffineSpace3fa(vx,vy,vz,p));
}
void move (float dx, float dy, float dz)
{
AffineSpace3fa xfm = camera2world();
Vec3fa ds = xfmVector(xfm,Vec3fa(dx,dy,dz));
from += ds;
to += ds;
}
void rotate (float dtheta, float dphi)
{
if (handedness == RIGHT_HANDED) dtheta *= -1.0f;
const Vec3fa up1 = normalize(up);
Vec3fa view1 = normalize(to-from);
view1 = xfmVector(AffineSpace3fa::rotate(up1, dtheta), view1);
const float phi = acosf(dot(view1, up1));
const float dphi2 = phi - clamp(phi-dphi, 0.001f*float(pi), 0.999f*float(pi));
view1 = xfmVector(AffineSpace3fa::rotate(cross(view1, up1), dphi2), view1);
to = from + length(to-from) * view1;
}
void rotateOrbit (float dtheta, float dphi)
{
if (handedness == RIGHT_HANDED) dtheta *= -1.0f;
const Vec3fa up1 = normalize(up);
Vec3fa view1 = normalize(to-from);
view1 = xfmVector(AffineSpace3fa::rotate(up1, dtheta), view1);
const float phi = acosf(dot(view1, up1));
const float dphi2 = phi - clamp(phi-dphi, 0.001f*float(pi), 0.999f*float(pi));
view1 = xfmVector(AffineSpace3fa::rotate(cross(view1, up1), dphi2), view1);
from = to - length(to-from) * view1;
}
void dolly (float ds)
{
float dollySpeed = 0.01f;
float k = powf((1.0f-dollySpeed), ds);
from += length(to-from) * (1-k) * normalize(to-from);
}
public:
Vec3fa from; //!< position of camera
Vec3fa to; //!< look at point
Vec3fa up; //!< up vector
float fov; //!< field of view
Handedness handedness;
};
typedef Camera::ISPCCamera ISPCCamera;
}
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