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
|
/*************************************************************************/
/* gradient.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef GRADIENT_H
#define GRADIENT_H
#include "core/io/resource.h"
class Gradient : public Resource {
GDCLASS(Gradient, Resource);
OBJ_SAVE_TYPE(Gradient);
public:
enum InterpolationMode {
GRADIENT_INTERPOLATE_LINEAR,
GRADIENT_INTERPOLATE_CONSTANT,
GRADIENT_INTERPOLATE_CUBIC,
};
struct Point {
float offset = 0.0;
Color color;
bool operator<(const Point &p_ponit) const {
return offset < p_ponit.offset;
}
};
private:
Vector<Point> points;
bool is_sorted = true;
InterpolationMode interpolation_mode = GRADIENT_INTERPOLATE_LINEAR;
_FORCE_INLINE_ void _update_sorting() {
if (!is_sorted) {
points.sort();
is_sorted = true;
}
}
protected:
static void _bind_methods();
public:
Gradient();
virtual ~Gradient();
void add_point(float p_offset, const Color &p_color);
void remove_point(int p_index);
void set_points(const Vector<Point> &p_points);
Vector<Point> &get_points();
void reverse();
void set_offset(int pos, const float offset);
float get_offset(int pos);
void set_color(int pos, const Color &color);
Color get_color(int pos);
void set_offsets(const Vector<float> &p_offsets);
Vector<float> get_offsets() const;
void set_colors(const Vector<Color> &p_colors);
Vector<Color> get_colors() const;
void set_interpolation_mode(InterpolationMode p_interp_mode);
InterpolationMode get_interpolation_mode();
_FORCE_INLINE_ Color get_color_at_offset(float p_offset) {
if (points.is_empty()) {
return Color(0, 0, 0, 1);
}
_update_sorting();
// Binary search.
int low = 0;
int high = points.size() - 1;
int middle = 0;
#ifdef DEBUG_ENABLED
if (low > high) {
ERR_PRINT("low > high, this may be a bug");
}
#endif
while (low <= high) {
middle = (low + high) / 2;
const Point &point = points[middle];
if (point.offset > p_offset) {
high = middle - 1; //search low end of array
} else if (point.offset < p_offset) {
low = middle + 1; //search high end of array
} else {
return point.color;
}
}
// Return interpolated value.
if (points[middle].offset > p_offset) {
middle--;
}
int first = middle;
int second = middle + 1;
if (second >= points.size()) {
return points[points.size() - 1].color;
}
if (first < 0) {
return points[0].color;
}
const Point &pointFirst = points[first];
const Point &pointSecond = points[second];
switch (interpolation_mode) {
case GRADIENT_INTERPOLATE_LINEAR: {
return pointFirst.color.lerp(pointSecond.color, (p_offset - pointFirst.offset) / (pointSecond.offset - pointFirst.offset));
} break;
case GRADIENT_INTERPOLATE_CONSTANT: {
return pointFirst.color;
} break;
case GRADIENT_INTERPOLATE_CUBIC: {
int p0 = first - 1;
int p3 = second + 1;
if (p3 >= points.size()) {
p3 = second;
}
if (p0 < 0) {
p0 = first;
}
const Point &pointP0 = points[p0];
const Point &pointP3 = points[p3];
float x = (p_offset - pointFirst.offset) / (pointSecond.offset - pointFirst.offset);
float r = Math::cubic_interpolate(pointP0.color.r, pointFirst.color.r, pointSecond.color.r, pointP3.color.r, x);
float g = Math::cubic_interpolate(pointP0.color.g, pointFirst.color.g, pointSecond.color.g, pointP3.color.g, x);
float b = Math::cubic_interpolate(pointP0.color.b, pointFirst.color.b, pointSecond.color.b, pointP3.color.b, x);
float a = Math::cubic_interpolate(pointP0.color.a, pointFirst.color.a, pointSecond.color.a, pointP3.color.a, x);
return Color(r, g, b, a);
} break;
default: {
// Fallback to linear interpolation.
return pointFirst.color.lerp(pointSecond.color, (p_offset - pointFirst.offset) / (pointSecond.offset - pointFirst.offset));
}
}
}
int get_points_count() const;
};
VARIANT_ENUM_CAST(Gradient::InterpolationMode);
#endif // GRADIENT_H
|