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
|
/* ResidualVM - A 3D game interpreter
*
* ResidualVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the AUTHORS
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "engines/myst3/hotspot.h"
#include "engines/myst3/scene.h"
#include "engines/myst3/state.h"
#include "common/config-manager.h"
#include "common/math.h"
#include "math/ray.h"
namespace Myst3 {
static void polarRectTo3dRect(const PolarRect &polarRect,
Math::Vector3d &topLeft, Math::Vector3d &topRight,
Math::Vector3d &bottomLeft, Math::Vector3d &bottomRight) {
static const float scale = 50.0;
Math::Vector3d direction = Scene::directionToVector(polarRect.centerPitch, 90.0 - polarRect.centerHeading) * scale;
Math::Vector3d u = Math::Vector3d(direction.z(), 0.0, -direction.x());
u.normalize();
Math::Vector3d v = Math::Vector3d::crossProduct(direction, u);
v.normalize();
Math::Vector3d sizeU = u * polarRect.width / 90.0 * scale;
Math::Vector3d sizeV = v * polarRect.height / 90.0 * scale;
topRight = direction + sizeV + sizeU;
bottomRight = direction - sizeV + sizeU;
bottomLeft = direction - sizeV - sizeU;
topLeft = direction + sizeV - sizeU;
}
bool static rayIntersectsRect(const Math::Ray &ray, const Math::Vector3d &topLeft, const Math::Vector3d &topRight,
const Math::Vector3d &bottomLeft, const Math::Vector3d &bottomRight) {
// Orthogonal basis in rectangle coordinates
Math::Vector3d topRectDir = topRight - topLeft;
Math::Vector3d leftRectDir = bottomLeft - topLeft;
Math::Vector3d n = Math::Vector3d::crossProduct(topRectDir, leftRectDir);
float nDotDir = Math::Vector3d::dotProduct(n, ray.getDirection());
if (ABS(nDotDir) < 1e-6) {
// The ray is coplanar with the rectangle
return false;
}
// Solution to the system (intersection of line with plane):
// Line equation: V = ray.origin + t * ray.direction
// Plane equation: dot(n, V) = 0
float t = -Math::Vector3d::dotProduct(n, ray.getOrigin() - topLeft) / nDotDir;
if (t < 0.0) {
// The intersection is not in the ray direction
return false;
}
// Intersection point in world coordinates
Math::Vector3d intersection = ray.getOrigin() + ray.getDirection() * t;
// Intersection point in 2D rect coordinates
Math::Vector3d intersect2D = intersection - topLeft;
float u = Math::Vector3d::dotProduct(intersect2D, topRectDir);
float v = Math::Vector3d::dotProduct(intersect2D, leftRectDir);
// Intersection inside the rectangle
return (u >= 0.0 && u <= Math::Vector3d::dotProduct(topRectDir, topRectDir)
&& v >= 0.0 && v <= Math::Vector3d::dotProduct(leftRectDir, leftRectDir));
}
HotSpot::HotSpot() :
condition(0),
cursor(0) {
}
int32 HotSpot::isPointInRectsCube(float pitch, float heading) {
for (uint j = 0; j < rects.size(); j++) {
Math::Ray ray = Math::Ray(Math::Vector3d(), Scene::directionToVector(pitch, 90.0 - heading));
Math::Vector3d topLeft, topRight, bottomLeft, bottomRight;
polarRectTo3dRect(rects[j], topLeft, topRight, bottomLeft, bottomRight);
if (rayIntersectsRect(ray, topLeft, topRight, bottomLeft, bottomRight)) {
return j;
}
}
return -1;
}
int32 HotSpot::isPointInRectsFrame(GameState *state, const Common::Point &p) {
for (uint j = 0; j < rects.size(); j++) {
int16 x = rects[j].centerPitch;
int16 y = rects[j].centerHeading;
int16 w = rects[j].width;
int16 h = rects[j].height;
if (y < 0) {
x = state->getVar(x);
y = state->getVar(-y);
h = -h;
}
Common::Rect rect = Common::Rect(w, h);
rect.translate(x, y);
if (rect.contains(p))
return j;
}
return -1;
}
bool HotSpot::isEnabled(GameState *state, uint16 var) {
if (!state->evaluate(condition))
return false;
if (isZip()) {
if (!ConfMan.getBool("zip_mode") || !isZipDestinationAvailable(state)) {
return false;
}
}
if (var == 0)
return cursor <= 13;
else
return cursor == var;
}
int32 HotSpot::isZipDestinationAvailable(GameState *state) {
assert(isZip() && script.size() != 0);
uint16 node;
uint16 room = state->getLocationRoom();
uint32 age = state->getLocationAge();
// Get the zip destination from the script
Opcode op = script[0];
switch (op.op) {
case 140:
case 142:
node = op.args[0];
break;
case 141:
case 143:
node = op.args[1];
room = op.args[0];
break;
default:
error("Expected zip action");
}
return state->isZipDestinationAvailable(node, room, age);
}
} // End of namespace Myst3
|
