1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
#include "rail.h"
#include "game/network/link.h"
#include <GL/glew.h>
#include <array>
#include <cache.h>
#include <cassert>
#include <gfx/gl/shader.h>
#include <gfx/models/texture.h>
#include <gfx/models/vertex.hpp>
#include <glm/gtx/transform.hpp>
#include <initializer_list>
#include <location.hpp>
#include <maths.h>
#include <stdexcept>
#include <utility>
constexpr auto RAIL_CROSSSECTION_VERTICES {5U};
constexpr glm::vec3 RAIL_HEIGHT {0, .25F, 0};
RailLinks::RailLinks() : texture {Texture::cachedTexture.get("rails.jpg")} { }
void RailLinks::tick(TickDuration) { }
void
RailLinks::joinLinks(const LinkPtr & l) const
{
for (const auto & ol : links.objects) {
if (l != ol) {
for (const auto oe : {0, 1}) {
for (const auto te : {0, 1}) {
if (l->ends[te].node == ol->ends[oe].node) {
l->ends[te].nexts.emplace_back(ol, oe);
ol->ends[oe].nexts.emplace_back(l, te);
}
}
}
}
}
}
std::shared_ptr<RailLink>
RailLinks::addLinksBetween(glm::vec3 start, glm::vec3 end)
{
auto node1ins = nodes.insert(std::make_shared<Node>(start));
auto node2ins = nodes.insert(std::make_shared<Node>(end));
if (node1ins.second && node2ins.second) {
// Both nodes are new, direct link, easy
return addLink<RailLinkStraight>(start, end);
}
if (node1ins.second && !node2ins.second) {
// node1 is new, node2 exists, but we build from existing outwards
std::swap(node1ins, node2ins);
std::swap(start, end);
}
// Find start link/end - opposite entry dir to existing link; so pi +...
const auto findDir = [this](const auto & n) {
for (const auto & l : links.objects) {
for (const auto & e : l->ends) {
// cppcheck-suppress useStlAlgorithm
if (e.node == n) {
return e.dir;
}
}
}
throw std::runtime_error("Node exists but couldn't find it");
};
float dir = pi + findDir(*node1ins.first);
const glm::vec2 flatStart {!start}, flatEnd {!end};
if (!node2ins.second) {
auto midheight = [&](auto mid) {
const auto sm = glm::distance(flatStart, mid), em = glm::distance(flatEnd, mid);
return start.y + ((end.y - start.y) * (sm / (sm + em)));
};
float dir2 = pi + findDir(*node2ins.first);
if (const auto radii = find_arcs_radius(flatStart, dir, flatEnd, dir2); radii.first < radii.second) {
const auto radius {radii.first};
const auto c1 = flatStart + sincosf(dir + half_pi) * radius;
const auto c2 = flatEnd + sincosf(dir2 + half_pi) * radius;
const auto mid = (c1 + c2) / 2.F;
const auto midh = mid ^ midheight(mid);
addLink<RailLinkCurve>(start, midh, c1);
return addLink<RailLinkCurve>(end, midh, c2);
}
else {
const auto radius {radii.second};
const auto c1 = flatStart + sincosf(dir - half_pi) * radius;
const auto c2 = flatEnd + sincosf(dir2 - half_pi) * radius;
const auto mid = (c1 + c2) / 2.F;
const auto midh = mid ^ midheight(mid);
addLink<RailLinkCurve>(midh, start, c1);
return addLink<RailLinkCurve>(midh, end, c2);
}
}
const auto diff {end - start};
const auto vy {vector_yaw(diff)};
const auto n2ed {(vy * 2) - dir - pi};
const auto centre {find_arc_centre(flatStart, dir, flatEnd, n2ed)};
if (centre.second) { // right hand arc
std::swap(start, end);
}
return addLink<RailLinkCurve>(start, end, centre.first);
}
void
RailLinks::render(const Shader & shader) const
{
shader.setModel(Location {}, Shader::Program::StaticPos);
texture->Bind();
links.apply(&RailLink::render, shader);
}
void
RailLink::defaultMesh()
{
for (auto n = RAIL_CROSSSECTION_VERTICES; n < vertices.size(); n += 1) {
indices.push_back(n - RAIL_CROSSSECTION_VERTICES);
indices.push_back(n);
}
assert(vertices.capacity() == vertices.size());
assert(indices.capacity() == indices.size());
meshes.create<Mesh>(vertices, indices, GL_TRIANGLE_STRIP);
}
void
RailLink::render(const Shader &) const
{
meshes.apply(&Mesh::Draw);
}
constexpr const std::array<std::pair<glm::vec3, float>, RAIL_CROSSSECTION_VERTICES> railCrossSection {{
// ___________
// _/ \_
// left to right
{{-1.9F, 0.F, 0.F}, 0.F},
{{-.608F, RAIL_HEIGHT.y, 0.F}, 0.34F},
{{0, RAIL_HEIGHT.y * .7F, 0.F}, 0.5F},
{{.608F, RAIL_HEIGHT.y, 0.F}, 0.66F},
{{1.9F, 0.F, 0.F}, 1.F},
}};
constexpr auto sleepers {5.F}; // There are 5 repetitions of sleepers in the texture
inline auto
round_sleepers(const float v)
{
return round_frac(v, sleepers);
}
RailLinkStraight::RailLinkStraight(const NodePtr & a, const NodePtr & b) : RailLinkStraight(a, b, b->pos - a->pos) { }
RailLinkStraight::RailLinkStraight(NodePtr a, NodePtr b, const glm::vec3 & diff) :
RailLink({std::move(a), vector_yaw(diff)}, {std::move(b), vector_yaw(-diff)}, glm::length(diff))
{
vertices.reserve(2 * railCrossSection.size());
indices.reserve(2 * railCrossSection.size());
const auto len = round_sleepers(length / 2.F);
const auto e {flat_orientation(diff)};
for (int ei = 0; ei < 2; ei++) {
const auto trans {glm::translate(ends[ei].node->pos) * e};
for (const auto & rcs : railCrossSection) {
const glm::vec3 m {(trans * glm::vec4 {rcs.first, 1})};
vertices.emplace_back(m, glm::vec2 {rcs.second, ei ? len : 0.F}, up);
}
}
defaultMesh();
}
Location
RailLinkStraight::positionAt(float dist, unsigned char start) const
{
const auto es {std::make_pair(ends[start].node.get(), ends[1 - start].node.get())};
const auto diff {es.second->pos - es.first->pos};
const auto dir {glm::normalize(diff)};
return Location {es.first->pos + RAIL_HEIGHT + dir * dist, {-vector_pitch(dir), vector_yaw(dir), 0}};
}
RailLinkCurve::RailLinkCurve(const NodePtr & a, const NodePtr & b, glm::vec2 c) :
RailLinkCurve(a, b, {c.x, a->pos.y, c.y}, {!c, a->pos, b->pos})
{
}
RailLinkCurve::RailLinkCurve(const NodePtr & a, const NodePtr & b, glm::vec3 c, const Arc arc) :
RailLink({a, normalize(arc.first + half_pi)}, {b, normalize(arc.second - half_pi)},
(glm::length(a->pos - c)) * arc_length(arc)),
centreBase(c), radius {glm::length(ends[0].node->pos - centreBase)}, arc {arc}
{
const auto & e0p {ends[0].node->pos};
const auto & e1p {ends[1].node->pos};
const auto slength = round_sleepers(length / 2.F);
const auto segs = std::round(5.F * slength / std::pow(radius, 0.7F));
const auto step {glm::vec3 {-arc_length(arc), e0p.y - e1p.y, slength} / segs};
const auto trans {glm::translate(centreBase)};
int segCount = segs;
vertices.reserve((segCount + 1) * railCrossSection.size());
indices.reserve(segCount * 2 * railCrossSection.size());
for (glm::vec3 swing = {arc.second, e1p.y - centreBase.y, 0.F}; segCount >= 0; swing += step, --segCount) {
const auto t {trans * glm::rotate(swing.x - half_pi, up) * glm::translate(glm::vec3 {radius, swing.y, 0.F})};
for (const auto & rcs : railCrossSection) {
const glm::vec3 m {(t * glm::vec4 {rcs.first, 1})};
vertices.emplace_back(m, glm::vec2 {rcs.second, swing.z}, up);
}
}
defaultMesh();
}
Location
RailLinkCurve::positionAt(float dist, unsigned char start) const
{
static constexpr std::array<float, 2> dirOffset {half_pi, -half_pi};
const auto frac {dist / length};
const auto es {std::make_pair(ends[start].node.get(), ends[1 - start].node.get())};
const auto as {std::make_pair(arc[start], arc[1 - start])};
const auto ang {as.first + ((as.second - as.first) * frac)};
const auto relPos {!sincosf(ang) * radius};
const auto relClimb {RAIL_HEIGHT
+ glm::vec3 {0, -centreBase.y + es.first->pos.y + ((es.second->pos.y - es.first->pos.y) * frac), 0}};
const auto pitch {vector_pitch({0, (es.first->pos.y - es.second->pos.y) / length, 0})};
return Location {relPos + relClimb + centreBase, {pitch, normalize(ang + dirOffset[start]), 0}};
}
|
