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// Copyright 2009 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "PerspectiveCamera.h"
#ifndef OSPRAY_TARGET_SYCL
// ispc exports
#include "camera/PerspectiveCamera_ispc.h"
#endif
namespace ospray {
PerspectiveCamera::PerspectiveCamera(api::ISPCDevice &device)
: AddStructShared(device.getDRTDevice(), device, FFO_CAMERA_PERSPECTIVE)
{
#ifndef OSPRAY_TARGET_SYCL
getSh()->super.initRay = reinterpret_cast<ispc::Camera_initRay>(
ispc::PerspectiveCamera_initRay_addr());
#endif
}
std::string PerspectiveCamera::toString() const
{
return "ospray::PerspectiveCamera";
}
void PerspectiveCamera::commit()
{
Camera::commit();
fovy = getParam<float>("fovy", 60.f);
aspect = getParam<float>("aspect", 1.f);
apertureRadius = getParam<float>("apertureRadius", 0.f);
focusDistance = getParam<float>("focusDistance", 1.f);
architectural = getParam<bool>("architectural", false);
stereoMode = (OSPStereoMode)getParam<uint32_t>("stereoMode", OSP_STEREO_NONE);
// the default 63.5mm represents the average human IPD
interpupillaryDistance = getParam<float>("interpupillaryDistance", 0.0635f);
switch (stereoMode) {
case OSP_STEREO_SIDE_BY_SIDE:
aspect *= 0.5f;
break;
case OSP_STEREO_TOP_BOTTOM:
aspect *= 2.f;
break;
default:
break;
}
vec2f imgPlaneSize;
imgPlaneSize.y = 2.f * tanf(deg2rad(0.5f * fovy));
imgPlaneSize.x = imgPlaneSize.y * aspect;
// Set shared structure members
{
getSh()->scaledAperture = apertureRadius
? apertureRadius / (imgPlaneSize.x * focusDistance)
: 0.0f;
getSh()->super.needLensSample = getSh()->scaledAperture;
getSh()->aspect = aspect;
getSh()->stereoMode = stereoMode;
getSh()->dir_00 = normalize(dir);
getSh()->org = pos;
getSh()->imgPlaneSize = imgPlaneSize;
if (getSh()->super.motionBlur) {
#ifndef OSPRAY_TARGET_SYCL
getSh()->super.initRay = reinterpret_cast<ispc::Camera_initRay>(
ispc::PerspectiveCamera_initRayMB_addr());
#endif
getSh()->du_size = vec3f(imgPlaneSize.x, imgPlaneSize.y, architectural);
getSh()->dv_up = up;
getSh()->ipd_offset =
vec3f(0.5f * interpupillaryDistance, focusDistance, 0.0f);
} else {
#ifndef OSPRAY_TARGET_SYCL
getSh()->super.initRay = reinterpret_cast<ispc::Camera_initRay>(
ispc::PerspectiveCamera_initRay_addr());
#endif
getSh()->du_size = normalize(cross(getSh()->dir_00, up));
if (architectural) // orient film to be parallel to 'up'
getSh()->dv_up = normalize(up);
else // rotate film to be perpendicular to 'dir'
getSh()->dv_up = cross(getSh()->du_size, getSh()->dir_00);
getSh()->ipd_offset = 0.5f * interpupillaryDistance * getSh()->du_size;
switch (stereoMode) {
case OSP_STEREO_LEFT:
getSh()->org = getSh()->org - getSh()->ipd_offset;
break;
case OSP_STEREO_RIGHT:
getSh()->org = getSh()->org + getSh()->ipd_offset;
break;
case OSP_STEREO_TOP_BOTTOM:
// flip offset to have left eye at top (image coord origin at lower
// left)
getSh()->ipd_offset = -getSh()->ipd_offset;
break;
default:
break;
}
getSh()->du_size = getSh()->du_size * imgPlaneSize.x;
getSh()->dv_up = getSh()->dv_up * imgPlaneSize.y;
getSh()->dir_00 =
getSh()->dir_00 - 0.5f * getSh()->du_size - 0.5f * getSh()->dv_up;
// prescale to focal plane
if (getSh()->scaledAperture > 0.f) {
getSh()->du_size = getSh()->du_size * focusDistance;
getSh()->dv_up = getSh()->dv_up * focusDistance;
getSh()->dir_00 = getSh()->dir_00 * focusDistance;
}
}
}
}
box3f PerspectiveCamera::projectBox(const box3f &b) const
{
if (stereoMode != OSP_STEREO_NONE) {
return box3f(vec3f(0.f), vec3f(1.f));
}
box3f projection;
const vec3f dir = normalize(
getSh()->dir_00 + 0.5f * getSh()->du_size + 0.5f * getSh()->dv_up);
const vec3f dun = normalize(getSh()->du_size) / getSh()->imgPlaneSize.x;
const vec3f dvn = normalize(getSh()->dv_up) / getSh()->imgPlaneSize.y;
vec3f projectedPt(-1.f, -1.f, 1e20f);
for (uint32_t i = 0; i < 8; ++i) {
// Get the point we should be projecting
vec3f p;
switch (i) {
case 0:
p = b.lower;
break;
case 1:
p.x = b.upper.x;
p.y = b.lower.y;
p.z = b.lower.z;
break;
case 2:
p.x = b.upper.x;
p.y = b.upper.y;
p.z = b.lower.z;
break;
case 3:
p.x = b.lower.x;
p.y = b.upper.y;
p.z = b.lower.z;
break;
case 4:
p.x = b.lower.x;
p.y = b.lower.y;
p.z = b.upper.z;
break;
case 5:
p.x = b.upper.x;
p.y = b.lower.y;
p.z = b.upper.z;
break;
case 6:
p = b.upper;
break;
case 7:
p.x = b.lower.x;
p.y = b.upper.y;
p.z = b.upper.z;
break;
}
// We find the intersection of the ray through the point with the virtual
// film plane, then find the vector to this point from the origin of the
// film plane (screenDir) and project this point onto the x/y axes of
// the plane.
const vec3f v = p - getSh()->org;
const vec3f r = normalize(v);
const float denom = dot(-r, -dir);
if (denom != 0.f) {
float t = 1.f / denom;
const vec3f screenDir = r * t - getSh()->dir_00;
projectedPt.x = dot(screenDir, dun);
projectedPt.y = dot(screenDir, dvn);
projectedPt.z = std::signbit(t) ? -length(v) : length(v);
projection.lower.x = min(projectedPt.x, projection.lower.x);
projection.lower.y = min(projectedPt.y, projection.lower.y);
projection.lower.z = min(projectedPt.z, projection.lower.z);
projection.upper.x = max(projectedPt.x, projection.upper.x);
projection.upper.y = max(projectedPt.y, projection.upper.y);
projection.upper.z = max(projectedPt.z, projection.upper.z);
}
}
// If some points are behind and some are in front mark the box
// as covering the full screen
if (projection.lower.z < 0.f && projection.upper.z > 0.f) {
projection.lower.x = 0.f;
projection.lower.y = 0.f;
projection.upper.x = 1.f;
projection.upper.y = 1.f;
}
return projection;
}
} // namespace ospray
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