forked from bartvdbraak/blender
776 lines
25 KiB
C++
776 lines
25 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "render/camera.h"
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#include "render/mesh.h"
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#include "render/object.h"
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#include "render/scene.h"
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#include "render/tables.h"
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#include "device/device.h"
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#include "util/util_foreach.h"
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#include "util/util_function.h"
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#include "util/util_logging.h"
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#include "util/util_math_cdf.h"
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#include "util/util_vector.h"
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/* needed for calculating differentials */
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#include "kernel/kernel_compat_cpu.h"
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#include "kernel/split/kernel_split_data.h"
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#include "kernel/kernel_globals.h"
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#include "kernel/kernel_projection.h"
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#include "kernel/kernel_differential.h"
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#include "kernel/kernel_montecarlo.h"
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#include "kernel/kernel_camera.h"
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CCL_NAMESPACE_BEGIN
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static float shutter_curve_eval(float x, array<float> &shutter_curve)
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{
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if (shutter_curve.size() == 0) {
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return 1.0f;
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}
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x *= shutter_curve.size();
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int index = (int)x;
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float frac = x - index;
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if (index < shutter_curve.size() - 1) {
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return lerp(shutter_curve[index], shutter_curve[index + 1], frac);
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}
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else {
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return shutter_curve[shutter_curve.size() - 1];
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}
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}
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NODE_DEFINE(Camera)
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{
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NodeType *type = NodeType::add("camera", create);
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SOCKET_FLOAT(shuttertime, "Shutter Time", 1.0f);
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static NodeEnum motion_position_enum;
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motion_position_enum.insert("start", MOTION_POSITION_START);
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motion_position_enum.insert("center", MOTION_POSITION_CENTER);
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motion_position_enum.insert("end", MOTION_POSITION_END);
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SOCKET_ENUM(motion_position, "Motion Position", motion_position_enum, MOTION_POSITION_CENTER);
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static NodeEnum rolling_shutter_type_enum;
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rolling_shutter_type_enum.insert("none", ROLLING_SHUTTER_NONE);
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rolling_shutter_type_enum.insert("top", ROLLING_SHUTTER_TOP);
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SOCKET_ENUM(rolling_shutter_type,
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"Rolling Shutter Type",
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rolling_shutter_type_enum,
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ROLLING_SHUTTER_NONE);
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SOCKET_FLOAT(rolling_shutter_duration, "Rolling Shutter Duration", 0.1f);
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SOCKET_FLOAT_ARRAY(shutter_curve, "Shutter Curve", array<float>());
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SOCKET_FLOAT(aperturesize, "Aperture Size", 0.0f);
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SOCKET_FLOAT(focaldistance, "Focal Distance", 10.0f);
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SOCKET_UINT(blades, "Blades", 0);
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SOCKET_FLOAT(bladesrotation, "Blades Rotation", 0.0f);
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SOCKET_TRANSFORM(matrix, "Matrix", transform_identity());
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SOCKET_TRANSFORM_ARRAY(motion, "Motion", array<Transform>());
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SOCKET_FLOAT(aperture_ratio, "Aperture Ratio", 1.0f);
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static NodeEnum type_enum;
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type_enum.insert("perspective", CAMERA_PERSPECTIVE);
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type_enum.insert("orthograph", CAMERA_ORTHOGRAPHIC);
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type_enum.insert("panorama", CAMERA_PANORAMA);
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SOCKET_ENUM(type, "Type", type_enum, CAMERA_PERSPECTIVE);
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static NodeEnum panorama_type_enum;
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panorama_type_enum.insert("equirectangular", PANORAMA_EQUIRECTANGULAR);
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panorama_type_enum.insert("mirrorball", PANORAMA_MIRRORBALL);
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panorama_type_enum.insert("fisheye_equidistant", PANORAMA_FISHEYE_EQUIDISTANT);
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panorama_type_enum.insert("fisheye_equisolid", PANORAMA_FISHEYE_EQUISOLID);
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SOCKET_ENUM(panorama_type, "Panorama Type", panorama_type_enum, PANORAMA_EQUIRECTANGULAR);
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SOCKET_FLOAT(fisheye_fov, "Fisheye FOV", M_PI_F);
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SOCKET_FLOAT(fisheye_lens, "Fisheye Lens", 10.5f);
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SOCKET_FLOAT(latitude_min, "Latitude Min", -M_PI_2_F);
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SOCKET_FLOAT(latitude_max, "Latitude Max", M_PI_2_F);
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SOCKET_FLOAT(longitude_min, "Longitude Min", -M_PI_F);
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SOCKET_FLOAT(longitude_max, "Longitude Max", M_PI_F);
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SOCKET_FLOAT(fov, "FOV", M_PI_4_F);
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SOCKET_FLOAT(fov_pre, "FOV Pre", M_PI_4_F);
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SOCKET_FLOAT(fov_post, "FOV Post", M_PI_4_F);
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static NodeEnum stereo_eye_enum;
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stereo_eye_enum.insert("none", STEREO_NONE);
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stereo_eye_enum.insert("left", STEREO_LEFT);
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stereo_eye_enum.insert("right", STEREO_RIGHT);
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SOCKET_ENUM(stereo_eye, "Stereo Eye", stereo_eye_enum, STEREO_NONE);
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SOCKET_BOOLEAN(use_spherical_stereo, "Use Spherical Stereo", false);
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SOCKET_FLOAT(interocular_distance, "Interocular Distance", 0.065f);
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SOCKET_FLOAT(convergence_distance, "Convergence Distance", 30.0f * 0.065f);
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SOCKET_BOOLEAN(use_pole_merge, "Use Pole Merge", false);
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SOCKET_FLOAT(pole_merge_angle_from, "Pole Merge Angle From", 60.0f * M_PI_F / 180.0f);
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SOCKET_FLOAT(pole_merge_angle_to, "Pole Merge Angle To", 75.0f * M_PI_F / 180.0f);
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SOCKET_FLOAT(sensorwidth, "Sensor Width", 0.036f);
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SOCKET_FLOAT(sensorheight, "Sensor Height", 0.024f);
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SOCKET_FLOAT(nearclip, "Near Clip", 1e-5f);
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SOCKET_FLOAT(farclip, "Far Clip", 1e5f);
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SOCKET_FLOAT(viewplane.left, "Viewplane Left", 0);
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SOCKET_FLOAT(viewplane.right, "Viewplane Right", 0);
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SOCKET_FLOAT(viewplane.bottom, "Viewplane Bottom", 0);
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SOCKET_FLOAT(viewplane.top, "Viewplane Top", 0);
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SOCKET_FLOAT(border.left, "Border Left", 0);
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SOCKET_FLOAT(border.right, "Border Right", 0);
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SOCKET_FLOAT(border.bottom, "Border Bottom", 0);
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SOCKET_FLOAT(border.top, "Border Top", 0);
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SOCKET_FLOAT(offscreen_dicing_scale, "Offscreen Dicing Scale", 1.0f);
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return type;
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}
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Camera::Camera() : Node(node_type)
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{
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shutter_table_offset = TABLE_OFFSET_INVALID;
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width = 1024;
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height = 512;
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resolution = 1;
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use_perspective_motion = false;
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shutter_curve.resize(RAMP_TABLE_SIZE);
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for (int i = 0; i < shutter_curve.size(); ++i) {
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shutter_curve[i] = 1.0f;
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}
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compute_auto_viewplane();
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screentoworld = projection_identity();
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rastertoworld = projection_identity();
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ndctoworld = projection_identity();
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rastertocamera = projection_identity();
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cameratoworld = transform_identity();
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worldtoraster = projection_identity();
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full_rastertocamera = projection_identity();
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dx = make_float3(0.0f, 0.0f, 0.0f);
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dy = make_float3(0.0f, 0.0f, 0.0f);
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need_update = true;
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need_device_update = true;
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need_flags_update = true;
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previous_need_motion = -1;
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memset((void *)&kernel_camera, 0, sizeof(kernel_camera));
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}
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Camera::~Camera()
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{
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}
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void Camera::compute_auto_viewplane()
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{
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if (type == CAMERA_PANORAMA) {
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viewplane.left = 0.0f;
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viewplane.right = 1.0f;
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viewplane.bottom = 0.0f;
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viewplane.top = 1.0f;
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}
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else {
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float aspect = (float)width / (float)height;
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if (width >= height) {
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viewplane.left = -aspect;
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viewplane.right = aspect;
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viewplane.bottom = -1.0f;
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viewplane.top = 1.0f;
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}
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else {
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viewplane.left = -1.0f;
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viewplane.right = 1.0f;
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viewplane.bottom = -1.0f / aspect;
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viewplane.top = 1.0f / aspect;
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}
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}
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}
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void Camera::update(Scene *scene)
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{
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Scene::MotionType need_motion = scene->need_motion();
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if (previous_need_motion != need_motion) {
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/* scene's motion model could have been changed since previous device
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* camera update this could happen for example in case when one render
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* layer has got motion pass and another not */
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need_device_update = true;
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}
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if (!need_update)
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return;
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/* Full viewport to camera border in the viewport. */
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Transform fulltoborder = transform_from_viewplane(viewport_camera_border);
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Transform bordertofull = transform_inverse(fulltoborder);
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/* ndc to raster */
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Transform ndctoraster = transform_scale(width, height, 1.0f) * bordertofull;
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Transform full_ndctoraster = transform_scale(full_width, full_height, 1.0f) * bordertofull;
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/* raster to screen */
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Transform screentondc = fulltoborder * transform_from_viewplane(viewplane);
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Transform screentoraster = ndctoraster * screentondc;
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Transform rastertoscreen = transform_inverse(screentoraster);
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Transform full_screentoraster = full_ndctoraster * screentondc;
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Transform full_rastertoscreen = transform_inverse(full_screentoraster);
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/* screen to camera */
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ProjectionTransform cameratoscreen;
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if (type == CAMERA_PERSPECTIVE)
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cameratoscreen = projection_perspective(fov, nearclip, farclip);
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else if (type == CAMERA_ORTHOGRAPHIC)
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cameratoscreen = projection_orthographic(nearclip, farclip);
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else
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cameratoscreen = projection_identity();
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ProjectionTransform screentocamera = projection_inverse(cameratoscreen);
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rastertocamera = screentocamera * rastertoscreen;
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full_rastertocamera = screentocamera * full_rastertoscreen;
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cameratoraster = screentoraster * cameratoscreen;
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cameratoworld = matrix;
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screentoworld = cameratoworld * screentocamera;
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rastertoworld = cameratoworld * rastertocamera;
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ndctoworld = rastertoworld * ndctoraster;
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/* note we recompose matrices instead of taking inverses of the above, this
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* is needed to avoid inverting near degenerate matrices that happen due to
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* precision issues with large scenes */
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worldtocamera = transform_inverse(matrix);
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worldtoscreen = cameratoscreen * worldtocamera;
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worldtondc = screentondc * worldtoscreen;
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worldtoraster = ndctoraster * worldtondc;
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/* differentials */
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if (type == CAMERA_ORTHOGRAPHIC) {
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dx = transform_perspective_direction(&rastertocamera, make_float3(1, 0, 0));
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dy = transform_perspective_direction(&rastertocamera, make_float3(0, 1, 0));
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full_dx = transform_perspective_direction(&full_rastertocamera, make_float3(1, 0, 0));
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full_dy = transform_perspective_direction(&full_rastertocamera, make_float3(0, 1, 0));
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}
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else if (type == CAMERA_PERSPECTIVE) {
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dx = transform_perspective(&rastertocamera, make_float3(1, 0, 0)) -
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transform_perspective(&rastertocamera, make_float3(0, 0, 0));
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dy = transform_perspective(&rastertocamera, make_float3(0, 1, 0)) -
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transform_perspective(&rastertocamera, make_float3(0, 0, 0));
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full_dx = transform_perspective(&full_rastertocamera, make_float3(1, 0, 0)) -
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transform_perspective(&full_rastertocamera, make_float3(0, 0, 0));
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full_dy = transform_perspective(&full_rastertocamera, make_float3(0, 1, 0)) -
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transform_perspective(&full_rastertocamera, make_float3(0, 0, 0));
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}
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else {
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dx = make_float3(0.0f, 0.0f, 0.0f);
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dy = make_float3(0.0f, 0.0f, 0.0f);
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}
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dx = transform_direction(&cameratoworld, dx);
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dy = transform_direction(&cameratoworld, dy);
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full_dx = transform_direction(&cameratoworld, full_dx);
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full_dy = transform_direction(&cameratoworld, full_dy);
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if (type == CAMERA_PERSPECTIVE) {
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float3 v = transform_perspective(&full_rastertocamera,
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make_float3(full_width, full_height, 1.0f));
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frustum_right_normal = normalize(make_float3(v.z, 0.0f, -v.x));
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frustum_top_normal = normalize(make_float3(0.0f, v.z, -v.y));
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}
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/* Compute kernel camera data. */
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KernelCamera *kcam = &kernel_camera;
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/* store matrices */
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kcam->screentoworld = screentoworld;
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kcam->rastertoworld = rastertoworld;
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kcam->rastertocamera = rastertocamera;
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kcam->cameratoworld = cameratoworld;
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kcam->worldtocamera = worldtocamera;
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kcam->worldtoscreen = worldtoscreen;
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kcam->worldtoraster = worldtoraster;
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kcam->worldtondc = worldtondc;
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kcam->ndctoworld = ndctoworld;
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/* camera motion */
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kcam->num_motion_steps = 0;
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kcam->have_perspective_motion = 0;
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kernel_camera_motion.clear();
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/* Test if any of the transforms are actually different. */
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bool have_motion = false;
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for (size_t i = 0; i < motion.size(); i++) {
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have_motion = have_motion || motion[i] != matrix;
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}
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if (need_motion == Scene::MOTION_PASS) {
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/* TODO(sergey): Support perspective (zoom, fov) motion. */
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if (type == CAMERA_PANORAMA) {
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if (have_motion) {
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kcam->motion_pass_pre = transform_inverse(motion[0]);
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kcam->motion_pass_post = transform_inverse(motion[motion.size() - 1]);
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}
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else {
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kcam->motion_pass_pre = kcam->worldtocamera;
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kcam->motion_pass_post = kcam->worldtocamera;
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}
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}
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else {
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if (have_motion) {
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kcam->perspective_pre = cameratoraster * transform_inverse(motion[0]);
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kcam->perspective_post = cameratoraster * transform_inverse(motion[motion.size() - 1]);
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}
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else {
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kcam->perspective_pre = worldtoraster;
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kcam->perspective_post = worldtoraster;
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}
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}
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}
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else if (need_motion == Scene::MOTION_BLUR) {
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if (have_motion) {
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kernel_camera_motion.resize(motion.size());
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transform_motion_decompose(kernel_camera_motion.data(), motion.data(), motion.size());
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kcam->num_motion_steps = motion.size();
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}
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/* TODO(sergey): Support other types of camera. */
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if (use_perspective_motion && type == CAMERA_PERSPECTIVE) {
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/* TODO(sergey): Move to an utility function and de-duplicate with
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* calculation above.
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*/
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ProjectionTransform screentocamera_pre = projection_inverse(
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projection_perspective(fov_pre, nearclip, farclip));
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ProjectionTransform screentocamera_post = projection_inverse(
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projection_perspective(fov_post, nearclip, farclip));
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kcam->perspective_pre = screentocamera_pre * rastertoscreen;
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kcam->perspective_post = screentocamera_post * rastertoscreen;
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kcam->have_perspective_motion = 1;
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}
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}
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/* depth of field */
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kcam->aperturesize = aperturesize;
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kcam->focaldistance = focaldistance;
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kcam->blades = (blades < 3) ? 0.0f : blades;
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kcam->bladesrotation = bladesrotation;
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/* motion blur */
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kcam->shuttertime = (need_motion == Scene::MOTION_BLUR) ? shuttertime : -1.0f;
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/* type */
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kcam->type = type;
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/* anamorphic lens bokeh */
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kcam->inv_aperture_ratio = 1.0f / aperture_ratio;
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/* panorama */
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kcam->panorama_type = panorama_type;
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kcam->fisheye_fov = fisheye_fov;
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kcam->fisheye_lens = fisheye_lens;
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kcam->equirectangular_range = make_float4(longitude_min - longitude_max,
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-longitude_min,
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latitude_min - latitude_max,
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-latitude_min + M_PI_2_F);
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switch (stereo_eye) {
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case STEREO_LEFT:
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kcam->interocular_offset = -interocular_distance * 0.5f;
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break;
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case STEREO_RIGHT:
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kcam->interocular_offset = interocular_distance * 0.5f;
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break;
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case STEREO_NONE:
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default:
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kcam->interocular_offset = 0.0f;
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break;
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}
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kcam->convergence_distance = convergence_distance;
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if (use_pole_merge) {
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kcam->pole_merge_angle_from = pole_merge_angle_from;
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kcam->pole_merge_angle_to = pole_merge_angle_to;
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}
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else {
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kcam->pole_merge_angle_from = -1.0f;
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kcam->pole_merge_angle_to = -1.0f;
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}
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/* sensor size */
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kcam->sensorwidth = sensorwidth;
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kcam->sensorheight = sensorheight;
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/* render size */
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kcam->width = width;
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kcam->height = height;
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kcam->resolution = resolution;
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/* store differentials */
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kcam->dx = float3_to_float4(dx);
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kcam->dy = float3_to_float4(dy);
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/* clipping */
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kcam->nearclip = nearclip;
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kcam->cliplength = (farclip == FLT_MAX) ? FLT_MAX : farclip - nearclip;
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/* Camera in volume. */
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kcam->is_inside_volume = 0;
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/* Rolling shutter effect */
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kcam->rolling_shutter_type = rolling_shutter_type;
|
|
kcam->rolling_shutter_duration = rolling_shutter_duration;
|
|
|
|
/* Set further update flags */
|
|
need_update = false;
|
|
need_device_update = true;
|
|
need_flags_update = true;
|
|
previous_need_motion = need_motion;
|
|
}
|
|
|
|
void Camera::device_update(Device * /* device */, DeviceScene *dscene, Scene *scene)
|
|
{
|
|
update(scene);
|
|
|
|
if (!need_device_update)
|
|
return;
|
|
|
|
scene->lookup_tables->remove_table(&shutter_table_offset);
|
|
if (kernel_camera.shuttertime != -1.0f) {
|
|
vector<float> shutter_table;
|
|
util_cdf_inverted(SHUTTER_TABLE_SIZE,
|
|
0.0f,
|
|
1.0f,
|
|
function_bind(shutter_curve_eval, _1, shutter_curve),
|
|
false,
|
|
shutter_table);
|
|
shutter_table_offset = scene->lookup_tables->add_table(dscene, shutter_table);
|
|
kernel_camera.shutter_table_offset = (int)shutter_table_offset;
|
|
}
|
|
|
|
dscene->data.cam = kernel_camera;
|
|
|
|
size_t num_motion_steps = kernel_camera_motion.size();
|
|
if (num_motion_steps) {
|
|
DecomposedTransform *camera_motion = dscene->camera_motion.alloc(num_motion_steps);
|
|
memcpy(camera_motion, kernel_camera_motion.data(), sizeof(*camera_motion) * num_motion_steps);
|
|
dscene->camera_motion.copy_to_device();
|
|
}
|
|
else {
|
|
dscene->camera_motion.free();
|
|
}
|
|
}
|
|
|
|
void Camera::device_update_volume(Device * /*device*/, DeviceScene *dscene, Scene *scene)
|
|
{
|
|
if (!need_device_update && !need_flags_update) {
|
|
return;
|
|
}
|
|
KernelCamera *kcam = &dscene->data.cam;
|
|
BoundBox viewplane_boundbox = viewplane_bounds_get();
|
|
for (size_t i = 0; i < scene->objects.size(); ++i) {
|
|
Object *object = scene->objects[i];
|
|
if (object->mesh->has_volume && viewplane_boundbox.intersects(object->bounds)) {
|
|
/* TODO(sergey): Consider adding more grained check. */
|
|
VLOG(1) << "Detected camera inside volume.";
|
|
kcam->is_inside_volume = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!kcam->is_inside_volume) {
|
|
VLOG(1) << "Camera is outside of the volume.";
|
|
}
|
|
need_device_update = false;
|
|
need_flags_update = false;
|
|
}
|
|
|
|
void Camera::device_free(Device * /*device*/, DeviceScene *dscene, Scene *scene)
|
|
{
|
|
scene->lookup_tables->remove_table(&shutter_table_offset);
|
|
dscene->camera_motion.free();
|
|
}
|
|
|
|
bool Camera::modified(const Camera &cam)
|
|
{
|
|
return !Node::equals(cam);
|
|
}
|
|
|
|
bool Camera::motion_modified(const Camera &cam)
|
|
{
|
|
return !((motion == cam.motion) && (use_perspective_motion == cam.use_perspective_motion));
|
|
}
|
|
|
|
void Camera::tag_update()
|
|
{
|
|
need_update = true;
|
|
}
|
|
|
|
float3 Camera::transform_raster_to_world(float raster_x, float raster_y)
|
|
{
|
|
float3 D, P;
|
|
if (type == CAMERA_PERSPECTIVE) {
|
|
D = transform_perspective(&rastertocamera, make_float3(raster_x, raster_y, 0.0f));
|
|
float3 Pclip = normalize(D);
|
|
P = make_float3(0.0f, 0.0f, 0.0f);
|
|
/* TODO(sergey): Aperture support? */
|
|
P = transform_point(&cameratoworld, P);
|
|
D = normalize(transform_direction(&cameratoworld, D));
|
|
/* TODO(sergey): Clipping is conditional in kernel, and hence it could
|
|
* be mistakes in here, currently leading to wrong camera-in-volume
|
|
* detection.
|
|
*/
|
|
P += nearclip * D / Pclip.z;
|
|
}
|
|
else if (type == CAMERA_ORTHOGRAPHIC) {
|
|
D = make_float3(0.0f, 0.0f, 1.0f);
|
|
/* TODO(sergey): Aperture support? */
|
|
P = transform_perspective(&rastertocamera, make_float3(raster_x, raster_y, 0.0f));
|
|
P = transform_point(&cameratoworld, P);
|
|
D = normalize(transform_direction(&cameratoworld, D));
|
|
}
|
|
else {
|
|
assert(!"unsupported camera type");
|
|
}
|
|
return P;
|
|
}
|
|
|
|
BoundBox Camera::viewplane_bounds_get()
|
|
{
|
|
/* TODO(sergey): This is all rather stupid, but is there a way to perform
|
|
* checks we need in a more clear and smart fashion? */
|
|
BoundBox bounds = BoundBox::empty;
|
|
|
|
if (type == CAMERA_PANORAMA) {
|
|
if (use_spherical_stereo == false) {
|
|
bounds.grow(make_float3(cameratoworld.x.w, cameratoworld.y.w, cameratoworld.z.w));
|
|
}
|
|
else {
|
|
float half_eye_distance = interocular_distance * 0.5f;
|
|
|
|
bounds.grow(make_float3(
|
|
cameratoworld.x.w + half_eye_distance, cameratoworld.y.w, cameratoworld.z.w));
|
|
|
|
bounds.grow(make_float3(
|
|
cameratoworld.z.w, cameratoworld.y.w + half_eye_distance, cameratoworld.z.w));
|
|
|
|
bounds.grow(make_float3(
|
|
cameratoworld.x.w - half_eye_distance, cameratoworld.y.w, cameratoworld.z.w));
|
|
|
|
bounds.grow(make_float3(
|
|
cameratoworld.x.w, cameratoworld.y.w - half_eye_distance, cameratoworld.z.w));
|
|
}
|
|
}
|
|
else {
|
|
bounds.grow(transform_raster_to_world(0.0f, 0.0f));
|
|
bounds.grow(transform_raster_to_world(0.0f, (float)height));
|
|
bounds.grow(transform_raster_to_world((float)width, (float)height));
|
|
bounds.grow(transform_raster_to_world((float)width, 0.0f));
|
|
if (type == CAMERA_PERSPECTIVE) {
|
|
/* Center point has the most distance in local Z axis,
|
|
* use it to construct bounding box/
|
|
*/
|
|
bounds.grow(transform_raster_to_world(0.5f * width, 0.5f * height));
|
|
}
|
|
}
|
|
return bounds;
|
|
}
|
|
|
|
float Camera::world_to_raster_size(float3 P)
|
|
{
|
|
float res = 1.0f;
|
|
|
|
if (type == CAMERA_ORTHOGRAPHIC) {
|
|
res = min(len(full_dx), len(full_dy));
|
|
|
|
if (offscreen_dicing_scale > 1.0f) {
|
|
float3 p = transform_point(&worldtocamera, P);
|
|
float3 v = transform_perspective(&full_rastertocamera,
|
|
make_float3(full_width, full_height, 0.0f));
|
|
|
|
/* Create point clamped to frustum */
|
|
float3 c;
|
|
c.x = max(-v.x, min(v.x, p.x));
|
|
c.y = max(-v.y, min(v.y, p.y));
|
|
c.z = max(0.0f, p.z);
|
|
|
|
float f_dist = len(p - c) / sqrtf((v.x * v.x + v.y * v.y) * 0.5f);
|
|
|
|
if (f_dist > 0.0f) {
|
|
res += res * f_dist * (offscreen_dicing_scale - 1.0f);
|
|
}
|
|
}
|
|
}
|
|
else if (type == CAMERA_PERSPECTIVE) {
|
|
/* Calculate as if point is directly ahead of the camera. */
|
|
float3 raster = make_float3(0.5f * full_width, 0.5f * full_height, 0.0f);
|
|
float3 Pcamera = transform_perspective(&full_rastertocamera, raster);
|
|
|
|
/* dDdx */
|
|
float3 Ddiff = transform_direction(&cameratoworld, Pcamera);
|
|
float3 dx = len_squared(full_dx) < len_squared(full_dy) ? full_dx : full_dy;
|
|
float3 dDdx = normalize(Ddiff + dx) - normalize(Ddiff);
|
|
|
|
/* dPdx */
|
|
float dist = len(transform_point(&worldtocamera, P));
|
|
float3 D = normalize(Ddiff);
|
|
res = len(dist * dDdx - dot(dist * dDdx, D) * D);
|
|
|
|
/* Decent approx distance to frustum
|
|
* (doesn't handle corners correctly, but not that big of a deal) */
|
|
float f_dist = 0.0f;
|
|
|
|
if (offscreen_dicing_scale > 1.0f) {
|
|
float3 p = transform_point(&worldtocamera, P);
|
|
|
|
/* Distance from the four planes */
|
|
float r = dot(p, frustum_right_normal);
|
|
float t = dot(p, frustum_top_normal);
|
|
p = make_float3(-p.x, -p.y, p.z);
|
|
float l = dot(p, frustum_right_normal);
|
|
float b = dot(p, frustum_top_normal);
|
|
p = make_float3(-p.x, -p.y, p.z);
|
|
|
|
if (r <= 0.0f && l <= 0.0f && t <= 0.0f && b <= 0.0f) {
|
|
/* Point is inside frustum */
|
|
f_dist = 0.0f;
|
|
}
|
|
else if (r > 0.0f && l > 0.0f && t > 0.0f && b > 0.0f) {
|
|
/* Point is behind frustum */
|
|
f_dist = len(p);
|
|
}
|
|
else {
|
|
/* Point may be behind or off to the side, need to check */
|
|
float3 along_right = make_float3(-frustum_right_normal.z, 0.0f, frustum_right_normal.x);
|
|
float3 along_left = make_float3(frustum_right_normal.z, 0.0f, frustum_right_normal.x);
|
|
float3 along_top = make_float3(0.0f, -frustum_top_normal.z, frustum_top_normal.y);
|
|
float3 along_bottom = make_float3(0.0f, frustum_top_normal.z, frustum_top_normal.y);
|
|
|
|
float dist[] = {r, l, t, b};
|
|
float3 along[] = {along_right, along_left, along_top, along_bottom};
|
|
|
|
bool test_o = false;
|
|
|
|
float *d = dist;
|
|
float3 *a = along;
|
|
for (int i = 0; i < 4; i++, d++, a++) {
|
|
/* Test if we should check this side at all */
|
|
if (*d > 0.0f) {
|
|
if (dot(p, *a) >= 0.0f) {
|
|
/* We are in front of the back edge of this side of the frustum */
|
|
f_dist = max(f_dist, *d);
|
|
}
|
|
else {
|
|
/* Possibly far enough behind the frustum to use distance to origin instead of edge
|
|
*/
|
|
test_o = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (test_o) {
|
|
f_dist = (f_dist > 0) ? min(f_dist, len(p)) : len(p);
|
|
}
|
|
}
|
|
|
|
if (f_dist > 0.0f) {
|
|
res += len(dDdx - dot(dDdx, D) * D) * f_dist * (offscreen_dicing_scale - 1.0f);
|
|
}
|
|
}
|
|
}
|
|
else if (type == CAMERA_PANORAMA) {
|
|
float3 D = transform_point(&worldtocamera, P);
|
|
float dist = len(D);
|
|
|
|
Ray ray = {{0}};
|
|
|
|
/* Distortion can become so great that the results become meaningless, there
|
|
* may be a better way to do this, but calculating differentials from the
|
|
* point directly ahead seems to produce good enough results. */
|
|
#if 0
|
|
float2 dir = direction_to_panorama(&kernel_camera, kernel_camera_motion.data(), normalize(D));
|
|
float3 raster = transform_perspective(&full_cameratoraster, make_float3(dir.x, dir.y, 0.0f));
|
|
|
|
ray.t = 1.0f;
|
|
camera_sample_panorama(
|
|
&kernel_camera, kernel_camera_motion.data(), raster.x, raster.y, 0.0f, 0.0f, &ray);
|
|
if (ray.t == 0.0f) {
|
|
/* No differentials, just use from directly ahead. */
|
|
camera_sample_panorama(&kernel_camera,
|
|
kernel_camera_motion.data(),
|
|
0.5f * full_width,
|
|
0.5f * full_height,
|
|
0.0f,
|
|
0.0f,
|
|
&ray);
|
|
}
|
|
#else
|
|
camera_sample_panorama(&kernel_camera,
|
|
kernel_camera_motion.data(),
|
|
0.5f * full_width,
|
|
0.5f * full_height,
|
|
0.0f,
|
|
0.0f,
|
|
&ray);
|
|
#endif
|
|
|
|
differential_transfer(&ray.dP, ray.dP, ray.D, ray.dD, ray.D, dist);
|
|
|
|
return max(len(ray.dP.dx), len(ray.dP.dy));
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
bool Camera::use_motion() const
|
|
{
|
|
return motion.size() > 1;
|
|
}
|
|
|
|
float Camera::motion_time(int step) const
|
|
{
|
|
return (use_motion()) ? 2.0f * step / (motion.size() - 1) - 1.0f : 0.0f;
|
|
}
|
|
|
|
int Camera::motion_step(float time) const
|
|
{
|
|
if (use_motion()) {
|
|
for (int step = 0; step < motion.size(); step++) {
|
|
if (time == motion_time(step)) {
|
|
return step;
|
|
}
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|