1/*
2
3Copyright (c) 2002, Calum Robinson
4All rights reserved.
5
6Redistribution and use in source and binary forms, with or without
7modification, are permitted provided that the following conditions are met:
8
9* Redistributions of source code must retain the above copyright notice, this
10  list of conditions and the following disclaimer.
11
12* Redistributions in binary form must reproduce the above copyright notice,
13  this list of conditions and the following disclaimer in the documentation
14  and/or other materials provided with the distribution.
15
16* Neither the name of the author nor the names of its contributors may be used
17  to endorse or promote products derived from this software without specific
18  prior written permission.
19
20THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
21ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
22WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
23DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
24ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
27ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31*/
32
33
34#include "Star.h"
35#include "Shared.h"
36
37
38#define BIGMYSTERY 1800.0
39#define MAXANGLES 16384
40
41
42// Construction/Destruction
43void
44InitStar(Star* s)
45{
46	for (int i=0; i < 3; i++)
47		s->position[i] = RandFlt(-10000.0, 10000.0);
48
49	s->rotSpeed = RandFlt(0.4, 0.9);
50	s->mystery = RandFlt(0.0, 10.0);
51}
52
53
54void
55UpdateStar(flurry_info_t* info, Star* s)
56{
57	 /* speed control */
58	float rotationsPerSecond = (float)(2.0 * M_PI * 12.0 / MAXANGLES)
59		* s->rotSpeed;
60	double thisPointInRadians;
61	double thisAngle = info->fTime * rotationsPerSecond;
62	float cf;
63	double tmpX1;
64	double tmpY1;
65	double tmpZ1;
66	double tmpX2;
67	double tmpY2;
68	double tmpZ2;
69	double tmpX3;
70	double tmpY3;
71	double tmpZ3;
72	double tmpX4;
73	double tmpY4;
74	double tmpZ4;
75	double rotation;
76	double cr;
77	double sr;
78
79	s->ate = 0;
80
81	cf = ((float)(cos(7.0 * ((info->fTime) * rotationsPerSecond))
82		+ cos(3.0 * ((info->fTime) * rotationsPerSecond))
83		+ cos(13.0 * ((info->fTime) * rotationsPerSecond))));
84	cf /= 6.0f;
85	cf += 0.75f;
86	thisPointInRadians = 2.0 * M_PI * (double) s->mystery / (double) BIGMYSTERY;
87
88	s->position[0] = 250.0f * cf * (float)cos(11.0 * (thisPointInRadians
89		+ (3.0 * thisAngle)));
90	s->position[1] = 250.0f * cf * (float)sin(12.0 * (thisPointInRadians
91		+ (4.0 * thisAngle)));
92	s->position[2] = 250.0f * (float)cos((23.0 * (thisPointInRadians
93		+ (12.0 * thisAngle))));
94
95	rotation = thisAngle * 0.501 + 5.01 * (double)s->mystery
96		/ (double)BIGMYSTERY;
97	cr = cos(rotation);
98	sr = sin(rotation);
99	tmpX1 = s->position[0] * cr - s->position[1] * sr;
100	tmpY1 = s->position[1] * cr + s->position[0] * sr;
101	tmpZ1 = s->position[2];
102
103	tmpX2 = tmpX1 * cr - tmpZ1 * sr;
104	tmpY2 = tmpY1;
105	tmpZ2 = tmpZ1 * cr + tmpX1 * sr;
106
107	tmpX3 = tmpX2;
108	tmpY3 = tmpY2 * cr - tmpZ2 * sr;
109	tmpZ3 = tmpZ2 * cr + tmpY2 * sr + seraphDistance;
110
111	rotation = thisAngle * 2.501 + 85.01 * (double)s->mystery
112		/ (double) BIGMYSTERY;
113	cr = cos(rotation);
114	sr = sin(rotation);
115	tmpX4 = tmpX3 * cr - tmpY3 * sr;
116	tmpY4 = tmpY3 * cr + tmpX3 * sr;
117	tmpZ4 = tmpZ3;
118
119	s->position[0] = (float)tmpX4;
120	s->position[1] = (float)tmpY4;
121	s->position[2] = (float)tmpZ4;
122}
123