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maszyna/world/Road.cpp

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/*
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
*/
#include "stdafx.h"
#include "world/Road.h"
#include "world/Track.h"
#include "simulation/simulation.h"
#include "scene/scene.h"
#include "rendering/renderer.h"
#include "utilities/Globals.h"
#include "utilities/Logs.h"
#include "utilities/parser.h"
#include "utilities/utilities.h"
namespace
{
// dimensions of the markings, in metres
// NOTE: these give a layout resembling an ordinary polish road, they weren't taken from the regulations
constexpr double line_width{0.12};
constexpr double line_spacing{0.12}; // gap between two lines painted side by side
constexpr double line_lift{0.02}; // the markings are raised over the surface, so the two don't fight for depth
constexpr double edge_inset{0.15}; // distance between the edge of the surface and the line running along it
constexpr double dash_period{12.0}; // a third of it is painted, the rest is the gap
constexpr double dash_step{2.0}; // longest straight piece of a painted line
// speed and reach of the paths made to turn the vehicles back at a loose end of the road
constexpr float turn_velocity{10.f};
constexpr double turn_reach{6.0};
glm::dvec3 const up{0.0, 1.0, 0.0};
// placement of a cross-section of the road
struct axis_frame
{
glm::dvec3 position;
glm::dvec3 tangent; // direction of the axis
glm::dvec3 left; // direction across the road, tilted by the roll
double roll{0.0};
};
// the axis of a road piece; a cubic bezier curve, the same thing the paths of the tracks are made of
class road_axis
{
public:
explicit road_axis(segment_data const &Path)
{
auto const &start{Path.points[segment_data::point::start]};
auto const &end{Path.points[segment_data::point::end]};
auto const &control1{Path.points[segment_data::point::control1]};
auto const &control2{Path.points[segment_data::point::control2]};
m_curved = (control1 != glm::dvec3{0.0}) || (control2 != glm::dvec3{0.0});
m_points[0] = start;
m_points[3] = end;
if (m_curved)
{
m_points[1] = start + control1;
m_points[2] = end + control2;
}
else
{
// a straight gets its control points in thirds of the length, the way the tracks do it
m_points[1] = start + (end - start) / 3.0;
m_points[2] = end - (end - start) / 3.0;
}
m_rolls = {glm::radians(static_cast<double>(Path.rolls[0])), glm::radians(static_cast<double>(Path.rolls[1]))};
m_radius = std::abs(Path.radius);
// distances along the curve for evenly spaced values of its parameter, to convert the former into the latter
m_stations.resize(samples + 1);
m_stations[0] = 0.0;
auto previous{m_points[0]};
for (int idx = 1; idx <= samples; ++idx)
{
auto const current{point(static_cast<double>(idx) / samples)};
m_stations[idx] = m_stations[idx - 1] + glm::distance(previous, current);
previous = current;
}
}
bool curved() const
{
return m_curved;
}
double length() const
{
return m_stations.back();
}
// control vector of specified end of the curve, relative to that end
glm::dvec3 control(int const End) const
{
return End == 0 ? m_points[1] - m_points[0] : m_points[2] - m_points[3];
}
glm::dvec3 point(double const T) const
{
auto const u{1.0 - T};
return u * u * u * m_points[0] + 3.0 * u * u * T * m_points[1] + 3.0 * u * T * T * m_points[2] + T * T * T * m_points[3];
}
// curvature of the axis seen from above, positive when it bends to the left
double curvature(double const T) const
{
auto const first{derivative(T)};
auto const second{6.0 * (1.0 - T) * (m_points[2] - 2.0 * m_points[1] + m_points[0]) + 6.0 * T * (m_points[3] - 2.0 * m_points[2] + m_points[1])};
auto const speedsquared{first.x * first.x + first.z * first.z};
if (speedsquared < 1e-9)
{
return 0.0;
}
return (second.x * first.z - second.z * first.x) / (speedsquared * std::sqrt(speedsquared));
}
// cross-section at specified value of the curve parameter
axis_frame frame(double const T) const
{
axis_frame frame;
frame.position = point(T);
auto direction{derivative(T)};
if (glm::length2(direction) < 1e-9)
{
// a control point placed right at the end of the curve
direction = derivative(std::clamp(T, 0.01, 0.99));
}
if (glm::length2(direction) < 1e-9)
{
direction = m_points[3] - m_points[0];
}
if (glm::length2(direction) < 1e-9)
{
direction = glm::dvec3{0.0, 0.0, 1.0};
}
frame.tangent = glm::normalize(direction);
// with the y axis up and the vehicle facing along z its left side is at positive x
glm::dvec3 across{frame.tangent.z, 0.0, -frame.tangent.x};
across = (glm::length2(across) < 1e-9 ? glm::dvec3{1.0, 0.0, 0.0} : glm::normalize(across));
// positive roll lowers the right side of the road, same as it does for the tracks
frame.roll = glm::mix(m_rolls[0], m_rolls[1], T);
frame.left = across * std::cos(frame.roll) + up * std::sin(frame.roll);
return frame;
}
// cross-section at specified distance from the start of the axis
axis_frame at(double const Station) const
{
return frame(parameter(Station));
}
// length of pieces the road is cut into along the axis; follows the rules the tracks use
double step() const
{
if (false == m_curved)
{
return 10.0;
}
auto const fidelity{std::max(1.0, static_cast<double>(Global.SplineFidelity))};
return std::clamp(m_radius != 0.0 ? m_radius * 0.02 / fidelity : length() * 0.1, 2.0 / fidelity, 10.0 / fidelity);
}
private:
static constexpr int samples{64};
glm::dvec3 derivative(double const T) const
{
auto const u{1.0 - T};
return 3.0 * u * u * (m_points[1] - m_points[0]) + 6.0 * u * T * (m_points[2] - m_points[1]) + 3.0 * T * T * (m_points[3] - m_points[2]);
}
double parameter(double const Station) const
{
if (Station <= 0.0)
{
return 0.0;
}
if (Station >= length())
{
return 1.0;
}
// first of the sampled distances past the requested one; it's never the very first sample
auto const idx{std::distance(m_stations.begin(), std::upper_bound(m_stations.begin(), m_stations.end(), Station))};
auto const span{m_stations[idx] - m_stations[idx - 1]};
auto const fraction{span > 0.0 ? (Station - m_stations[idx - 1]) / span : 0.0};
return (static_cast<double>(idx - 1) + fraction) / samples;
}
std::array<glm::dvec3, 4> m_points;
std::array<double, 2> m_rolls{};
double m_radius{0.0};
bool m_curved{false};
std::vector<double> m_stations;
};
// corner of the cross-section of something laid along the road
struct profile_point
{
double offset; // distance from the axis, positive to the left
double height; // above the surface
float texture; // texture coordinate across the road
};
// stretches provided profile along a part of the axis. the profile points go left to right, each two neighbours make a band of triangles.
void loft(std::vector<world_vertex> &Output, road_axis const &Axis, std::vector<profile_point> const &Profile, double const From, double const To, double const Step, double const Texturelength)
{
if (Profile.size() < 2 || To <= From || Step <= 0.0)
{
return;
}
auto const count{std::max(1, static_cast<int>(std::ceil((To - From) / Step - 0.001)))};
auto const pointcount{Profile.size()};
// each band is flat across the road, and follows its bends along it
auto const normal = [](glm::dvec3 const &Tangent, glm::dvec3 const &Across) {
auto const result{glm::cross(Tangent, Across)};
return glm::vec3{glm::length2(result) < 1e-12 ? up : glm::normalize(result)};
};
std::vector<glm::dvec3> previous(pointcount), current(pointcount);
axis_frame previousframe;
double previousstation{From};
for (int section = 0; section <= count; ++section)
{
auto const station{From + (To - From) * section / count};
auto const frame{Axis.at(station)};
for (std::size_t idx = 0; idx < pointcount; ++idx)
{
current[idx] = frame.position + frame.left * Profile[idx].offset + up * Profile[idx].height;
}
if (section > 0)
{
auto const texturestart{static_cast<float>(previousstation / Texturelength)};
auto const textureend{static_cast<float>(station / Texturelength)};
for (std::size_t idx = 0; idx + 1 < pointcount; ++idx)
{
auto const normalstart{normal(previousframe.tangent, previous[idx] - previous[idx + 1])};
auto const normalend{normal(frame.tangent, current[idx] - current[idx + 1])};
world_vertex const leftstart{previous[idx], normalstart, {Profile[idx].texture, texturestart}};
world_vertex const rightstart{previous[idx + 1], normalstart, {Profile[idx + 1].texture, texturestart}};
world_vertex const leftend{current[idx], normalend, {Profile[idx].texture, textureend}};
world_vertex const rightend{current[idx + 1], normalend, {Profile[idx + 1].texture, textureend}};
Output.push_back(leftstart);
Output.push_back(rightstart);
Output.push_back(leftend);
Output.push_back(rightstart);
Output.push_back(rightend);
Output.push_back(leftend);
}
}
previous.swap(current);
previousframe = frame;
previousstation = station;
}
}
// proportions of the image specified material is painted with
float texture_ratio(std::string const &Material)
{
auto const material{GfxRenderer->Fetch_Material(Material)};
if (material == null_handle)
{
return 1.f;
}
auto const texture{GfxRenderer->Material(material)->GetTexture(0)};
if (texture == null_handle)
{
return 1.f;
}
auto const &image{GfxRenderer->Texture(texture)};
return image.get_height() > 0 ? static_cast<float>(image.get_width()) / static_cast<float>(image.get_height()) : 1.f;
}
} // namespace
// brings the content to a usable form: values within their limits, an entry for each lane and for each pair of neighbours
void road_node::state::normalize()
{
forward = std::clamp(forward, 0, 8);
backward = std::clamp(backward, 0, 8);
if (forward + backward == 0)
{
forward = 1;
}
lanewidth = std::max(1.f, lanewidth);
if (texturelength < 0.01f)
{
texturelength = 4.f;
}
if (surface.empty())
{
surface = "none";
}
// the paths of the lanes are loaded from text, so what goes into it has to be something they understand
static std::array<std::string, 7> const environments{"flat", "mountains", "mountain", "canyon", "tunnel", "bridge", "bank"};
if (std::find(environments.begin(), environments.end(), environment) == environments.end())
{
environment = "flat";
}
auto const count{static_cast<std::size_t>(forward + backward)};
if (lanes.size() != count)
{
lane_data fresh;
fresh.width = lanewidth;
fresh.velocity = velocity;
lanes.assign(count, fresh);
}
for (auto &lane : lanes)
{
lane.width = std::max(1.f, lane.width);
}
if (changes.size() != count - 1)
{
changes.resize(count - 1);
for (std::size_t boundary = 0; boundary < changes.size(); ++boundary)
{
changes[boundary] = default_change(boundary);
}
}
for (auto &change : changes)
{
change = std::clamp(change, static_cast<int>(change_none), static_cast<int>(change_both));
}
}
// identifier of a lane: f1..fn go along the axis and b1..bn against it, both counted outwards from where the directions meet
std::string road_node::state::lane_id(std::size_t const Lane) const
{
auto const against{static_cast<std::size_t>(backward)};
return Lane < against ? "b" + std::to_string(against - Lane) : "f" + std::to_string(Lane - against + 1);
}
// number of a lane in the left to right order, -1 if there's no lane with such identifier
int road_node::state::lane_index(std::string const &Id) const
{
if (Id.size() < 2 || Id.size() > 3 || (Id[0] != 'f' && Id[0] != 'b'))
{
return -1;
}
int number{0};
for (std::size_t idx = 1; idx < Id.size(); ++idx)
{
if (Id[idx] < '0' || Id[idx] > '9')
{
return -1;
}
number = number * 10 + (Id[idx] - '0');
}
if (number < 1 || number > (Id[0] == 'f' ? forward : backward))
{
return -1;
}
return Id[0] == 'f' ? backward + number - 1 : backward - number;
}
// permission to change the lane a pair of neighbouring lanes gets if the scenery doesn't say otherwise
int road_node::state::default_change(std::size_t const Boundary) const
{
auto const opposite{backward > 0 && forward > 0 && Boundary + 1 == static_cast<std::size_t>(backward)};
if (false == opposite)
{
return change_both;
}
// overtaking across the oncoming lane is left for the simple two lane roads
return (forward == 1 && backward == 1) ? change_both : change_none;
}
// distance of the middle of a lane from the axis, positive to the left when facing along the axis
double road_node::state::lane_offset(std::size_t const Lane) const
{
auto offset{0.5 * width()};
for (std::size_t idx = 0; idx < Lane && idx < lanes.size(); ++idx)
{
offset -= lanes[idx].width;
}
return Lane < lanes.size() ? offset - 0.5 * lanes[Lane].width : offset;
}
// combined width of the lanes
double road_node::state::width() const
{
double total{0.0};
for (auto const &lane : lanes)
{
total += lane.width;
}
return total;
}
// shape of the middle of a lane, laid out in the direction of travel
segment_data road_node::state::lane_path(std::size_t const Lane) const
{
road_axis const centre{axis};
auto const offset{lane_offset(Lane)};
auto const begin{centre.frame(0.0)};
auto const end{centre.frame(1.0)};
segment_data path;
path.points[segment_data::point::start] = begin.position + begin.left * offset;
path.points[segment_data::point::end] = end.position + end.left * offset;
if (centre.curved())
{
// a line running beside a bend is shorter or longer than the bend itself, and so are its control vectors
path.points[segment_data::point::control1] = centre.control(0) * std::max(0.05, 1.0 - offset * std::cos(begin.roll) * centre.curvature(0.0));
path.points[segment_data::point::control2] = centre.control(1) * std::max(0.05, 1.0 - offset * std::cos(end.roll) * centre.curvature(1.0));
// if the roll changes along the road its sides rise or fall relative to the axis
auto const climb{offset * (std::sin(end.roll) - std::sin(begin.roll)) / 3.0};
path.points[segment_data::point::control1].y += climb;
path.points[segment_data::point::control2].y -= climb;
}
path.rolls = axis.rolls;
if (axis.radius != 0.f)
{
// the lanes on the inner side of the bend have it tighter
auto const turn{centre.curvature(0.5) >= 0.0 ? 1.0 : -1.0};
path.radius = static_cast<float>(std::max(1.0, std::abs(axis.radius) - turn * offset));
}
if (Lane < static_cast<std::size_t>(backward))
{
// the lane goes against the axis
std::swap(path.points[segment_data::point::start], path.points[segment_data::point::end]);
std::swap(path.points[segment_data::point::control1], path.points[segment_data::point::control2]);
path.rolls = {-axis.rolls[1], -axis.rolls[0]};
}
if (Global.bRollFix)
{
// with this setting on a rolled path gets raised when it's set up, by an amount fit for a railway track.
// the surface of the road stays where it is, so the lane is lowered beforehand to make up for it
path.points[segment_data::point::start].y -= std::abs(std::sin(glm::radians(static_cast<double>(path.rolls[0])))) * 0.75;
path.points[segment_data::point::end].y -= std::abs(std::sin(glm::radians(static_cast<double>(path.rolls[1])))) * 0.75;
}
return path;
}
// length of the axis
double road_node::state::length() const
{
return road_axis{axis}.length();
}
// position on the axis and direction of the axis, for specified value of the curve parameter
glm::dvec3 road_node::state::point(double const T) const
{
return road_axis{axis}.point(T);
}
glm::dvec3 road_node::state::tangent(double const T) const
{
return road_axis{axis}.frame(T).tangent;
}
road_node::road_node(scene::node_data const &Nodedata) : basic_node(Nodedata) {}
// restores content of the node from provided input stream; reads up to and including the closing 'endroad'
void road_node::import(cParser &Input, glm::dvec3 const &Offset)
{
auto const label{m_name.empty() ? std::string{"unnamed road"} : "road \"" + m_name + "\""};
m_state = state{};
m_state.axis.deserialize(Input, Offset);
// properties of the lanes can precede the statement which sets how many of them there are, so they wait until everything is read
struct lane_property
{
std::string lane;
std::string property;
float value;
};
struct change_property
{
std::string first;
std::string second;
std::string mode;
};
std::vector<lane_property> laneproperties;
std::vector<change_property> changeproperties;
auto token{Input.getToken<std::string>()};
while (false == token.empty() && token != "endroad")
{
if (token == "lanes")
{
// lanes <along the axis> <against the axis>
Input.getTokens(2);
Input >> m_state.forward >> m_state.backward;
}
else if (token == "width")
{
Input.getTokens();
Input >> m_state.lanewidth;
}
else if (token == "velocity")
{
Input.getTokens();
Input >> m_state.velocity;
}
else if (token == "lane")
{
// lane <lane> <width|velocity> <value>
lane_property property;
property.lane = Input.getToken<std::string>();
property.property = Input.getToken<std::string>();
property.value = 0.f;
Input.getTokens();
Input >> property.value;
laneproperties.emplace_back(property);
}
else if (token == "change")
{
// change <lane> <neighbouring lane> <both|none|ab|ba>
change_property property;
property.first = Input.getToken<std::string>();
property.second = Input.getToken<std::string>();
property.mode = Input.getToken<std::string>();
changeproperties.emplace_back(property);
}
else if (token == "surface")
{
m_state.surface = Input.getToken<std::string>();
replace_slashes(m_state.surface);
}
else if (token == "texlength")
{
Input.getTokens();
Input >> m_state.texturelength;
}
else if (token == "side")
{
// side <left|right|both> <none|shoulder|sidewalk> <width> <material>
auto const where{Input.getToken<std::string>()};
auto const type{Input.getToken<std::string>()};
side_data side;
Input.getTokens();
Input >> side.width;
side.material = Input.getToken<std::string>();
replace_slashes(side.material);
side.type = (type == "shoulder" ? side_type::shoulder : type == "sidewalk" ? side_type::sidewalk : side_type::none);
if (type != "shoulder" && type != "sidewalk" && type != "none")
{
ErrorLog("Bad road: unknown kind of side \"" + type + "\" defined for " + label);
}
if (where == "left" || where == "both")
{
m_state.sides[0] = side;
}
if (where == "right" || where == "both")
{
m_state.sides[1] = side;
}
if (where != "left" && where != "right" && where != "both")
{
ErrorLog("Bad road: unknown side \"" + where + "\" defined for " + label);
}
}
else if (token == "kerb")
{
Input.getTokens();
Input >> m_state.kerbheight;
}
else if (token == "slope")
{
// slope <width> <drop>
Input.getTokens(2);
Input >> m_state.slope.x >> m_state.slope.y;
}
else if (token == "markings")
{
auto const colour{Input.getToken<std::string>()};
m_state.markings = (colour == "white" ? marking_colour::white : colour == "orange" ? marking_colour::orange : marking_colour::none);
if (colour != "white" && colour != "orange" && colour != "none")
{
ErrorLog("Bad road: unknown colour of markings \"" + colour + "\" defined for " + label);
}
}
else if (token == "friction")
{
Input.getTokens();
Input >> m_state.friction;
}
else if (token == "environment")
{
m_state.environment = Input.getToken<std::string>();
}
else
{
ErrorLog("Bad road: unknown property: \"" + token + "\" defined for " + label);
}
token = Input.getToken<std::string>();
}
if (m_state.forward + m_state.backward <= 0)
{
ErrorLog("Bad road: " + label + " has no lanes, a single one is used instead");
}
auto const environment{m_state.environment};
m_state.normalize();
if (environment != m_state.environment)
{
ErrorLog("Bad road: unknown environment \"" + environment + "\" defined for " + label);
}
for (auto const &property : laneproperties)
{
auto const lane{m_state.lane_index(property.lane)};
if (lane < 0)
{
ErrorLog("Bad road: " + label + " has no lane \"" + property.lane + "\"");
continue;
}
if (property.property == "width")
{
m_state.lanes[lane].width = std::max(1.f, property.value);
}
else if (property.property == "velocity")
{
m_state.lanes[lane].velocity = property.value;
}
else
{
ErrorLog("Bad road: unknown lane property: \"" + property.property + "\" defined for " + label);
}
}
for (auto const &property : changeproperties)
{
auto const first{m_state.lane_index(property.first)};
auto const second{m_state.lane_index(property.second)};
if (first < 0 || second < 0 || std::abs(first - second) != 1)
{
ErrorLog("Bad road: lanes \"" + property.first + "\" and \"" + property.second + "\" aren't neighbours on " + label);
continue;
}
// the permissions are stored for the pair taken left to right
auto const firstonleft{first < second};
auto &change{m_state.changes[std::min(first, second)]};
if (property.mode == "both")
{
change = change_both;
}
else if (property.mode == "none")
{
change = change_none;
}
else if (property.mode == "ab")
{
change = (firstonleft ? change_toright : change_toleft);
}
else if (property.mode == "ba")
{
change = (firstonleft ? change_toleft : change_toright);
}
else
{
ErrorLog("Bad road: unknown lane change mode: \"" + property.mode + "\" defined for " + label);
}
}
location(m_state.point(0.5));
}
// replaces what the node knows about the road
void road_node::define(state const &State)
{
m_state = State;
m_state.normalize();
location(m_state.point(0.5));
m_area.radius = -1.f;
}
// creates paths of the lanes and hands them over to the simulation
void road_node::create_lanes()
{
m_tracks.assign(m_state.lanes.size(), nullptr);
for (std::size_t lane = 0; lane < m_state.lanes.size(); ++lane)
{
m_tracks[lane] = create_track(m_name.empty() ? std::string{} : m_name + ":" + m_state.lane_id(lane), m_state.lane_path(lane), m_state.lanes[lane].width, m_state.lanes[lane].velocity);
}
}
// links lanes of opposite directions at an end of the road which leads nowhere, so the vehicles can turn back
void road_node::close_ends()
{
// NOTE: without the link a vehicle reaching the end would be sent back on the lane it came by, against its direction
if (m_tracks.size() != m_state.lanes.size())
{
return;
}
road_axis const axis{m_state.axis};
for (int end = 0; end < 2; ++end)
{
// the lanes going along the axis leave the road at its end, the ones going against it leave at its start
auto const outwards{end == 1 ? axis.frame(1.0).tangent : -axis.frame(0.0).tangent};
for (int pair = 1; pair <= std::min(m_state.forward, m_state.backward); ++pair)
{
auto const forward{static_cast<std::size_t>(m_state.backward + pair - 1)};
auto const backward{static_cast<std::size_t>(m_state.backward - pair)};
auto *exit{m_tracks[end == 1 ? forward : backward]};
auto *entry{m_tracks[end == 1 ? backward : forward]};
if (exit == nullptr || entry == nullptr || exit->trNext != nullptr || entry->trPrev != nullptr)
{
continue;
}
segment_data path;
path.points[segment_data::point::start] = exit->CurrentSegment()->FastGetPoint_1();
path.points[segment_data::point::end] = entry->CurrentSegment()->FastGetPoint_0();
auto const span{glm::distance(path.points[segment_data::point::start], path.points[segment_data::point::end])};
path.points[segment_data::point::control1] = outwards * std::max(turn_reach, 1.5 * span);
path.points[segment_data::point::control2] = outwards * std::max(turn_reach, 1.5 * span);
path.radius = static_cast<float>(std::max(2.0, 0.5 * span));
auto *turn{create_track(m_name.empty() ? std::string{} : m_name + ":" + (end == 1 ? "endturn" : "startturn") + std::to_string(pair), path, m_state.lanes[forward].width, turn_velocity)};
exit->ConnectNextPrev(turn, 0);
turn->ConnectNextPrev(entry, 0);
m_turns.emplace_back(turn);
}
}
}
// gives up the paths of the lanes
std::vector<TTrack *> road_node::release_lanes()
{
std::vector<TTrack *> released;
released.swap(m_tracks);
released.erase(std::remove(released.begin(), released.end(), nullptr), released.end());
return released;
}
// gives up the paths made to close the loose ends
std::vector<TTrack *> road_node::release_turns()
{
std::vector<TTrack *> released;
released.swap(m_turns);
return released;
}
// true if there's a vehicle on any path of the road
bool road_node::occupied() const
{
for (auto const *tracks : {&m_tracks, &m_turns})
{
for (auto const *track : *tracks)
{
if (track != nullptr && false == track->Dynamics.empty())
{
return true;
}
}
}
return false;
}
// generates geometry of the surface, the sides and the markings
std::vector<scene::shape_node> road_node::create_shapes() const
{
// triangles are gathered separately for each look, so the lot can be drawn with as few shapes as possible
struct batch
{
std::string material;
lighting_data lighting;
std::vector<world_vertex> vertices;
};
std::vector<batch> batches;
auto const vertices = [&batches](std::string const &Material, lighting_data const &Lighting) -> std::vector<world_vertex> & {
for (auto &entry : batches)
{
if (entry.material == Material && entry.lighting == Lighting)
{
return entry.vertices;
}
}
batches.emplace_back();
batches.back().material = Material;
batches.back().lighting = Lighting;
return batches.back().vertices;
};
auto const &road{m_state};
road_axis const axis{road.axis};
auto const length{axis.length()};
auto const step{axis.step()};
auto const halfwidth{0.5 * road.width()};
double const texturelength{road.texturelength};
// surface. the image is centered on the axis, and repeated if the road is wider
if (road.surface != "none")
{
auto const tile{static_cast<double>(texture_ratio(road.surface)) * texturelength};
loft(vertices(road.surface, lighting_data{}), axis, {{halfwidth, 0.0, static_cast<float>(0.5 + halfwidth / tile)}, {-halfwidth, 0.0, static_cast<float>(0.5 - halfwidth / tile)}}, 0.0, length, step, texturelength);
}
// sides
for (int side = 0; side < 2; ++side)
{
auto const &data{road.sides[side]};
if (data.type == side_type::none || data.width <= 0.f || data.material.empty() || data.material == "none")
{
continue;
}
auto const direction{side == 0 ? 1.0 : -1.0};
// corners of the profile, from the edge of the surface outwards
std::vector<profile_point> profile;
if (data.type == side_type::shoulder)
{
// the image is laid out like the one of the legacy roads: the edge of the surface on its right, the bank on its left half
profile.push_back({direction * halfwidth, 0.0, 1.f});
profile.push_back({direction * (halfwidth + data.width), 0.0, 0.5f});
if (road.slope.x > 0.f)
{
profile.push_back({direction * (halfwidth + data.width + road.slope.x), -road.slope.y, 0.f});
}
}
else
{
// the image starts at the foot of the kerb, and is laid out in its own proportions
auto const tile{static_cast<double>(texture_ratio(data.material)) * texturelength};
profile.push_back({direction * halfwidth, 0.0, 0.f});
profile.push_back({direction * halfwidth, road.kerbheight, static_cast<float>(road.kerbheight / tile)});
profile.push_back({direction * (halfwidth + data.width), road.kerbheight, static_cast<float>((road.kerbheight + data.width) / tile)});
}
if (side == 0)
{
// the loft takes the corners left to right
std::reverse(profile.begin(), profile.end());
}
loft(vertices(data.material, lighting_data{}), axis, profile, 0.0, length, step, texturelength);
}
// markings. these are painted with plain colour instead of an image
if (road.markings != marking_colour::none)
{
lighting_data paint;
paint.diffuse = (road.markings == marking_colour::white ? glm::vec4{0.92f, 0.92f, 0.92f, 1.f} : glm::vec4{0.95f, 0.5f, 0.08f, 1.f});
paint.ambient = paint.diffuse;
auto &lines{vertices("colored", paint)};
auto const solid = [&](double const Offset) {
loft(lines, axis, {{Offset + 0.5 * line_width, line_lift, 0.f}, {Offset - 0.5 * line_width, line_lift, 1.f}}, 0.0, length, std::min(step, dash_step), texturelength);
};
// the dashes are fitted so the gaps at both ends of the road are a half of the regular one, which makes them match the next piece
auto const dashed = [&](double const Offset) {
auto const count{std::max(1, static_cast<int>(std::lround(length / dash_period)))};
auto const period{length / count};
for (int dash = 0; dash < count; ++dash)
{
auto const from{(dash + 1.0 / 3.0) * period};
loft(lines, axis, {{Offset + 0.5 * line_width, line_lift, 0.f}, {Offset - 0.5 * line_width, line_lift, 1.f}}, from, from + period / 3.0, dash_step, texturelength);
}
};
// edges of the surface
auto const edge{halfwidth - edge_inset - 0.5 * line_width};
if (edge > 0.5)
{
solid(edge);
solid(-edge);
}
// lines between the lanes. a lane can be left across a dashed line, or across a pair of lines if the dashed one is on its side
auto offset{halfwidth};
for (std::size_t boundary = 0; boundary < road.changes.size() && boundary < road.lanes.size(); ++boundary)
{
offset -= road.lanes[boundary].width;
auto const opposite{road.backward > 0 && boundary + 1 == static_cast<std::size_t>(road.backward)};
auto const pair{0.5 * (line_width + line_spacing)};
switch (road.changes[boundary])
{
case change_both:
{
dashed(offset);
break;
}
case change_toright:
{
dashed(offset + pair);
solid(offset - pair);
break;
}
case change_toleft:
{
solid(offset + pair);
dashed(offset - pair);
break;
}
default:
{
if (opposite)
{
// traffic going opposite ways is kept apart with a double line
solid(offset + pair);
solid(offset - pair);
}
else
{
solid(offset);
}
break;
}
}
}
}
std::vector<scene::shape_node> shapes;
for (auto &entry : batches)
{
if (entry.vertices.empty())
{
continue;
}
scene::shape_node shape;
shape.make_terrain(GfxRenderer->Fetch_Material(entry.material), std::move(entry.vertices), glm::dvec3{0.0});
shape.lighting(entry.lighting);
shapes.emplace_back(std::move(shape));
}
return shapes;
}
// puts geometry of the road in the scene as shapes of its own, which can be taken back
void road_node::show()
{
if (m_section != nullptr || m_merged || simulation::Region == nullptr || false == simulation::Region->point_inside(location()))
{
return;
}
auto shapes{create_shapes()};
if (shapes.empty())
{
return;
}
auto &section{simulation::Region->section(location())};
// the rest of the section has to be built by now, or it'd count our shapes as waiting for it too
section.create_geometry();
if (m_bank.bank == 0 && m_bank.chunk == 0)
{
m_bank = GfxRenderer->Create_Bank();
}
for (auto &shape : shapes)
{
// shapes held by a section are drawn relative to its centre
shape.origin(section.m_area.center);
auto const centre{shape.data().area.center};
auto const radius{shape.radius()};
shape.create_geometry(m_bank);
m_geometry.emplace_back(shape.data().geometry);
section.m_shapes.emplace_back(std::move(shape));
// the section may need to reach further to keep the road from being culled at its edges
section.m_area.radius = std::max(section.m_area.radius, static_cast<float>(glm::length(section.m_area.center - centre) + radius));
}
m_section = &section;
}
// takes back geometry put in the scene by show()
void road_node::hide()
{
if (m_section == nullptr)
{
return;
}
// our shapes are told from the others by their geometry. the renderer reclaims the chunks once they're no longer drawn
auto &shapes{m_section->m_shapes};
shapes.erase(std::remove_if(shapes.begin(), shapes.end(),
[this](scene::shape_node const &Shape) {
auto const handle{Shape.data().geometry};
return std::any_of(m_geometry.begin(), m_geometry.end(), [&handle](gfx::geometry_handle const &Own) { return Own.bank == handle.bank && Own.chunk == handle.chunk; });
}),
shapes.end());
m_geometry.clear();
m_section = nullptr;
}
// creates a path for the vehicles and registers it with the simulation
TTrack *road_node::create_track(std::string const &Name, segment_data const &Path, float const Width, float const Velocity)
{
auto const &start{Path.points[segment_data::point::start]};
auto const &control1{Path.points[segment_data::point::control1]};
auto const &control2{Path.points[segment_data::point::control2]};
auto const &end{Path.points[segment_data::point::end]};
// the path is put together the way the scenery defines an invisible road, to have it set up by the code which loads these
std::ostringstream text;
text.precision(std::numeric_limits<double>::digits10);
text << "road " << glm::distance(start, end) << ' ' << Width << ' ' << m_state.friction << ' ' << m_state.sounddistance << ' ' << m_state.quality << " 0 " << m_state.environment << " unvis " << start.x << ' ' << start.y << ' ' << start.z << ' ' << Path.rolls[0] << ' '
<< control1.x << ' ' << control1.y << ' ' << control1.z << ' ' << control2.x << ' ' << control2.y << ' ' << control2.z << ' ' << end.x << ' ' << end.y << ' ' << end.z << ' ' << Path.rolls[1] << ' ' << Path.radius << ' ';
if (Velocity > 0.f)
{
text << "velocity " << Velocity << ' ';
}
text << "endtrack";
cParser parser(text.str(), cParser::buffer_TEXT);
scene::node_data nodedata;
nodedata.range_max = -1.0;
nodedata.name = Name;
nodedata.type = "track";
auto *track{new TTrack(nodedata)};
track->Load(&parser, glm::dvec3{0.0});
track->m_road = this;
if (false == simulation::Paths.insert(track))
{
// NOTE: the table points the name at the newest path, which is what a road made anew in the editor needs
if (false == m_editorremoved && false == dirty())
{
ErrorLog("Bad scenario: duplicate track name \"" + track->name() + "\" generated for a road");
}
}
simulation::Region->insert_and_register(track);
return track;
}
// radius() subclass details, calculates node's bounding radius
float road_node::radius_()
{
return static_cast<float>(0.5 * m_state.length() + 0.5 * m_state.width() + std::max(m_state.sides[0].width, m_state.sides[1].width) + m_state.slope.x);
}
// serialize() subclass details, sends content of the subclass to provided stream
void road_node::serialize_(std::ostream &Output) const
{
// TODO: implement
}
// deserialize() subclass details, restores content of the subclass from provided stream
void road_node::deserialize_(std::istream &Input)
{
// TODO: implement
}
// export() subclass details, sends basic content of the class in legacy (text) format to provided stream
void road_node::export_as_text_(std::ostream &Output) const
{
auto const &road{m_state};
Output << "road ";
// axis
auto const precision{Output.precision(std::numeric_limits<double>::digits10)};
Output << road.axis.points[segment_data::point::start].x << ' ' << road.axis.points[segment_data::point::start].y << ' ' << road.axis.points[segment_data::point::start].z << ' ' << road.axis.rolls[0] << ' '
<< road.axis.points[segment_data::point::control1].x << ' ' << road.axis.points[segment_data::point::control1].y << ' ' << road.axis.points[segment_data::point::control1].z << ' '
<< road.axis.points[segment_data::point::control2].x << ' ' << road.axis.points[segment_data::point::control2].y << ' ' << road.axis.points[segment_data::point::control2].z << ' '
<< road.axis.points[segment_data::point::end].x << ' ' << road.axis.points[segment_data::point::end].y << ' ' << road.axis.points[segment_data::point::end].z << ' ' << road.axis.rolls[1] << ' '
<< road.axis.radius << ' ';
Output.precision(precision);
// lanes
Output << "lanes " << road.forward << ' ' << road.backward << ' ' << "width " << road.lanewidth << ' ';
if (road.velocity > 0.f)
{
Output << "velocity " << road.velocity << ' ';
}
for (std::size_t lane = 0; lane < road.lanes.size(); ++lane)
{
if (road.lanes[lane].width != road.lanewidth)
{
Output << "lane " << road.lane_id(lane) << " width " << road.lanes[lane].width << ' ';
}
if (road.lanes[lane].velocity != road.velocity)
{
Output << "lane " << road.lane_id(lane) << " velocity " << road.lanes[lane].velocity << ' ';
}
}
for (std::size_t boundary = 0; boundary < road.changes.size(); ++boundary)
{
if (road.changes[boundary] == road.default_change(boundary))
{
continue;
}
Output << "change " << road.lane_id(boundary) << ' ' << road.lane_id(boundary + 1) << ' ' << (road.changes[boundary] == change_both ? "both" : road.changes[boundary] == change_toright ? "ab" : road.changes[boundary] == change_toleft ? "ba" : "none") << ' ';
}
// appearance
Output << "surface " << road.surface << ' ' << "texlength " << road.texturelength << ' ';
char const *sidenames[]{"left", "right"};
for (int side = 0; side < 2; ++side)
{
auto const &data{road.sides[side]};
if (data.type == side_type::none)
{
continue;
}
Output << "side " << sidenames[side] << ' ' << (data.type == side_type::shoulder ? "shoulder" : "sidewalk") << ' ' << data.width << ' ' << (data.material.empty() ? "none" : data.material) << ' ';
}
Output << "kerb " << road.kerbheight << ' ' << "slope " << road.slope.x << ' ' << road.slope.y << ' ' << "markings " << (road.markings == marking_colour::white ? "white" : road.markings == marking_colour::orange ? "orange" : "none") << ' ';
// properties passed on to the lanes
Output << "friction " << road.friction << ' ' << "environment " << road.environment << ' ';
// footer
Output << "endroad"
<< "\n";
}
// legacy style initialization, to be performed when the tracks are already joined
void road_table::InitRoads()
{
for (auto *road : m_items)
{
if (road != nullptr)
{
road->close_ends();
}
}
}
// generates geometry of the roads and puts it in the scene
void road_table::create_geometry(scene::scratch_data &Scratchpad)
{
if (simulation::Region == nullptr)
{
return;
}
for (auto *road : m_items)
{
if (road == nullptr)
{
continue;
}
if (Global.editor_session && false == Global.NvRenderer)
{
// scenery opened for editing: the road keeps its geometry apart, so it can be changed later.
// NOTE: the experimental renderer draws only what the scenery had when it was loaded
road->show();
continue;
}
// otherwise the geometry joins the rest of the scenery, which lets it be drawn along with it at no extra cost
for (auto &shape : road->create_shapes())
{
// it's already where it belongs, so the placement set by the scenery isn't to be applied to it
simulation::Region->insert(shape, Scratchpad, false);
}
road->merged(true);
}
}
//---------------------------------------------------------------------------
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