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1 #include <stdio.h>
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2 #include <math.h>
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3 #include <stdlib.h>
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4 #include <string.h>
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5 #include <errno.h>
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6 #include "dsys2.h"
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7 #include "dsys_impl.h"
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8
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9 static float eval_step(struct dsys_event *ev, demotime_t t);
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10 static float eval_lerp(struct dsys_event *ev, demotime_t t);
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11 static float eval_sigmoid(struct dsys_event *ev, demotime_t t);
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12
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13 static void free_event(struct dsys_event *ev);
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14
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15
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16
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17 struct dsys_demo *dsys_open(const char *fname)
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18 {
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19 FILE *fp;
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20 struct dsys_demo *res;
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21
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22 if(!(fp = fopen(fname, "r"))) {
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23 fprintf(stderr, "failed to open demoscript: %s: %s\n", fname, strerror(errno));
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24 return 0;
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25 }
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26
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27 res = dsys_open_stream(fp);
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28 fclose(fp);
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29 return res;
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30 }
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31
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32 struct dsys_demo *dsys_open_stream(FILE *fp)
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33 {
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34 struct dsys_demo *demo;
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35
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36 if(!(demo = malloc(sizeof *demo))) {
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37 perror("failed to allocate memory");
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38 return 0;
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39 }
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40 memset(demo, 0, sizeof *demo);
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41
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42 demo->src_tm = demo->start_tm = -1;
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43
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44 /* TODO */
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45 return demo;
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46 }
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47
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48 void dsys_close(struct dsys_demo *demo)
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49 {
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50 while(demo->ev) {
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51 struct dsys_event *ev = demo->ev;
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52 demo->ev = demo->ev->next;
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53 free_event(ev);
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54 }
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55
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56 free(demo);
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57 }
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58
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59
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60 void dsys_update(struct dsys_demo *demo, demotime_t tm)
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61 {
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62 demo->src_tm = tm;
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63
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64 if(demo->start_tm == -1) {
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65 dsys_start(demo);
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66 }
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67
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68 if(demo->running) {
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69 demo->tm = tm - demo->start_tm - demo->stoppage_tm;
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70 }
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71
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72 /* TODO check the events list etc etc */
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73 }
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74
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75 void dsys_start(struct dsys_demo *demo)
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76 {
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77 if(demo->running) {
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78 return;
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79 }
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80
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81 if(demo->start_tm == -1) {
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82 demo->start_tm = demo->src_tm;
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83 } else {
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84 demo->stoppage_tm += demo->src_tm - demo->stop_tm;
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85 }
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86
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87 demo->running = 1;
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88 }
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89
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90 void dsys_stop(struct dsys_demo *demo)
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91 {
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92 if(!demo->running) {
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93 return;
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94 }
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95
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96 demo->stop_tm = demo->src_tm;
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97 demo->running = 0;
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98 }
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99
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100 int dsys_is_running(struct dsys_demo *demo)
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101 {
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102 return demo->running;
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103 }
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104
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105
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106 demotime_t dsys_duration(struct dsys_demo *demo)
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107 {
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108 return demo->duration;
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109 }
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110
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111 demotime_t dsys_time(struct dsys_demo *demo)
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112 {
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113 return demo->tm;
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114 }
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115
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116 float dsys_progress(struct dsys_demo *demo)
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117 {
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118 return demo->tm / demo->duration;
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119 }
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120
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121 /* seek without continuity */
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122 void dsys_seek(struct dsys_demo *demo, demotime_t tm)
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123 {
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124 /* TODO */
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125 }
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126
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127 void dsys_seek_norm(struct dsys_demo *demo, float t)
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128 {
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129 dsys_seek(demo, t * demo->duration);
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130 }
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131
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132 /* seek by accelerating time */
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133 void dsys_warp(struct dsys_demo *demo, demotime_t tm);
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134 void dsys_warp_norm(struct dsys_demo *demo, float t);
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135
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136
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137 /* events */
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138 struct dsys_event *dsys_event(struct dsys_demo *demo, const char *name);
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139
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140 enum dsys_evtype dsys_event_type(struct dsys_event *ev);
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141 float dsys_event_value(struct dsys_event *ev);
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142
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143 void dsys_event_callback(struct dsys_event *ev, void (*func)(void*), void *cls);
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144 void dsys_event_link(struct dsys_event *ev, float *link);
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145
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146
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147 /* time conversion */
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148 demotime_t dsys_sec_to_dtime(float sec)
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149 {
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150 return sec;
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151 }
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152
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153 demotime_t dsys_msec_to_dtime(unsigned long msec)
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154 {
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155 return (demotime_t)msec / 1000.0;
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156 }
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157
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158 float dsys_dtime_to_sec(demotime_t tm)
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159 {
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160 return tm;
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161 }
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162
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163 unsigned long dsys_dtime_to_msec(demotime_t tm)
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164 {
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165 return (unsigned long)(tm * 1000.0);
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166 }
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167
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168
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169 static float eval_step(struct dsys_event *ev, demotime_t t)
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170 {
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171 return t >= ev->t1 ? 1.0 : 0.0;
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172 }
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173
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174 static float eval_lerp(struct dsys_event *ev, demotime_t t)
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175 {
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176 return (t - ev->t0) / (ev->t1 - ev->t0);
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177 }
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178
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179 static float eval_sigmoid(struct dsys_event *ev, demotime_t t)
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180 {
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181 t = eval_lerp(ev, t);
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182 return 1.0 - (cos(t * M_PI) * 0.5 + 0.5);
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183 }
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184
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185 static void free_event(struct dsys_event *ev)
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186 {
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187 while(ev->cblist) {
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188 struct callback *cb = ev->cblist;
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189 ev->cblist = ev->cblist->next;
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190 free(cb);
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191 }
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192 }
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