libpsys: 0a53b22f7caf src/pattr.c

libpsys

view src/pattr.c @ 20:0a53b22f7caf

the billboarding was wrong ...

author	John Tsiombikas <nuclear@member.fsf.org>
date	Tue, 18 Sep 2012 09:38:48 +0300
parents	7fbed016e739
children

line source

1 #define _GNU_SOURCE

2 #include <stdio.h>

3 #include <stdlib.h>

4 #include <string.h>

5 #include <errno.h>

6 #include <ctype.h>

8 #ifdef _MSC_VER

9 #include <malloc.h>

10 #else

11 #include <alloca.h>

12 #endif

14 #include "pattr.h"

15 #include "psys_gl.h"

17 enum {

18 OPT_STR,

19 OPT_NUM,

20 OPT_NUM_RANGE,

21 OPT_VEC,

22 OPT_VEC_RANGE

23 };

25 struct cfgopt {

26 char *name;

27 int type;

28 long tm;

29 char *valstr;

30 vec3_t val, valrng;

31 };

33 static int init_particle_attr(struct psys_particle_attributes *pattr);

34 static void destroy_particle_attr(struct psys_particle_attributes *pattr);

35 static struct cfgopt *get_cfg_opt(const char *line);

36 static void release_cfg_opt(struct cfgopt *opt);

37 static char *stripspace(char *str);

39 static void *tex_cls;

40 static unsigned int (*load_texture)(const char*, void*) = psys_gl_load_texture;

41 static void (*unload_texture)(unsigned int, void*) = psys_gl_unload_texture;

44 void psys_texture_loader(unsigned int (*load)(const char*, void*), void (*unload)(unsigned int, void*), void *cls)

45 {

46 load_texture = load;

47 unload_texture = unload;

48 tex_cls = cls;

49 }

51 struct psys_attributes *psys_create_attr(void)

52 {

53 struct psys_attributes *attr = malloc(sizeof *attr);

54 if(attr) {

55 if(psys_init_attr(attr) == -1) {

56 free(attr);

57 attr = 0;

58 }

59 }

60 return attr;

61 }

63 void psys_free_attr(struct psys_attributes *attr)

64 {

65 psys_destroy_attr(attr);

66 free(attr);

67 }

69 int psys_init_attr(struct psys_attributes *attr)

70 {

71 memset(attr, 0, sizeof *attr);

73 if(psys_init_track3(&attr->spawn_range) == -1)

74 goto err;

75 if(psys_init_track(&attr->rate) == -1)

76 goto err;

77 if(psys_init_anm_rnd(&attr->life) == -1)

78 goto err;

79 if(psys_init_anm_rnd(&attr->size) == -1)

80 goto err;

81 if(psys_init_anm_rnd3(&attr->dir) == -1)

82 goto err;

83 if(psys_init_track3(&attr->grav) == -1)

84 goto err;

86 if(init_particle_attr(&attr->part_attr) == -1)

87 goto err;

89 attr->max_particles = -1;

91 anm_set_track_default(&attr->size.value.trk, 1.0);

92 anm_set_track_default(&attr->life.value.trk, 1.0);

94 return 0;

96 err:

97 psys_destroy_attr(attr);

98 return -1;

99 }

100

101

102 static int init_particle_attr(struct psys_particle_attributes *pattr)

103 {

104 if(psys_init_track3(&pattr->color) == -1) {

105 return -1;

106 }

107 if(psys_init_track(&pattr->alpha) == -1) {

108 psys_destroy_track3(&pattr->color);

109 return -1;

110 }

111 if(psys_init_track(&pattr->size) == -1) {

112 psys_destroy_track3(&pattr->color);

113 psys_destroy_track(&pattr->alpha);

114 return -1;

115 }

116

117 anm_set_track_default(&pattr->color.x, 1.0);

118 anm_set_track_default(&pattr->color.y, 1.0);

119 anm_set_track_default(&pattr->color.z, 1.0);

120 anm_set_track_default(&pattr->alpha.trk, 1.0);

121 anm_set_track_default(&pattr->size.trk, 1.0);

122 return 0;

123 }

124

125

126 void psys_destroy_attr(struct psys_attributes *attr)

127 {

128 psys_destroy_track3(&attr->spawn_range);

129 psys_destroy_track(&attr->rate);

130 psys_destroy_anm_rnd(&attr->life);

131 psys_destroy_anm_rnd(&attr->size);

132 psys_destroy_anm_rnd3(&attr->dir);

133 psys_destroy_track3(&attr->grav);

134

135 destroy_particle_attr(&attr->part_attr);

136

137 if(attr->tex && unload_texture) {

138 unload_texture(attr->tex, tex_cls);

139 }

140 }

141

142 static void destroy_particle_attr(struct psys_particle_attributes *pattr)

143 {

144 psys_destroy_track3(&pattr->color);

145 psys_destroy_track(&pattr->alpha);

146 psys_destroy_track(&pattr->size);

147 }

148

149 void psys_eval_attr(struct psys_attributes *attr, anm_time_t tm)

150 {

151 psys_eval_track3(&attr->spawn_range, tm);

152 psys_eval_track(&attr->rate, tm);

153 psys_eval_anm_rnd(&attr->life, tm);

154 psys_eval_anm_rnd(&attr->size, tm);

155 psys_eval_anm_rnd3(&attr->dir, tm);

156 psys_eval_track3(&attr->grav, tm);

157 }

158

159 int psys_load_attr(struct psys_attributes *attr, const char *fname)

160 {

161 FILE *fp;

162 int res;

163

164 if(!fname) {

165 return -1;

166 }

167

168 if(!(fp = fopen(fname, "r"))) {

169 fprintf(stderr, "%s: failed to read file: %s: %s\n", __func__, fname, strerror(errno));

170 return -1;

171 }

172 res = psys_load_attr_stream(attr, fp);

173 fclose(fp);

174 return res;

175 }

176

177 int psys_load_attr_stream(struct psys_attributes *attr, FILE *fp)

178 {

179 int lineno = 0;

180 char buf[512];

181 struct cfgopt *opt = 0;

182

183 psys_init_attr(attr);

184

185 while(fgets(buf, sizeof buf, fp)) {

186

187 lineno++;

188

189 if(!(opt = get_cfg_opt(buf))) {

190 continue;

191 }

192

193 if(strcmp(opt->name, "texture") == 0) {

194 if(opt->type != OPT_STR) {

195 goto err;

196 }

197 if(!(attr->tex = load_texture(opt->valstr, tex_cls))) {

198 fprintf(stderr, "failed to load texture: %s\n", opt->valstr);

199 goto err;

200 }

201

202 release_cfg_opt(opt);

203 continue;

204 } else if(opt->type == OPT_STR) {

205 fprintf(stderr, "invalid particle config: '%s'\n", opt->name);

206 goto err;

207 }

208

209 if(strcmp(opt->name, "spawn_range") == 0) {

210 psys_set_value3(&attr->spawn_range, opt->tm, opt->val);

211 } else if(strcmp(opt->name, "rate") == 0) {

212 psys_set_value(&attr->rate, opt->tm, opt->val.x);

213 } else if(strcmp(opt->name, "life") == 0) {

214 psys_set_anm_rnd(&attr->life, opt->tm, opt->val.x, opt->valrng.x);

215 } else if(strcmp(opt->name, "size") == 0) {

216 psys_set_anm_rnd(&attr->size, opt->tm, opt->val.x, opt->valrng.x);

217 } else if(strcmp(opt->name, "dir") == 0) {

218 psys_set_anm_rnd3(&attr->dir, opt->tm, opt->val, opt->valrng);

219 } else if(strcmp(opt->name, "grav") == 0) {

220 psys_set_value3(&attr->grav, opt->tm, opt->val);

221 } else if(strcmp(opt->name, "drag") == 0) {

222 attr->drag = opt->val.x;

223 } else if(strcmp(opt->name, "pcolor") == 0) {

224 psys_set_value3(&attr->part_attr.color, opt->tm, opt->val);

225 } else if(strcmp(opt->name, "palpha") == 0) {

226 psys_set_value(&attr->part_attr.alpha, opt->tm, opt->val.x);

227 } else if(strcmp(opt->name, "psize") == 0) {

228 psys_set_value(&attr->part_attr.size, opt->tm, opt->val.x);

229 } else {

230 fprintf(stderr, "unrecognized particle config option: %s\n", opt->name);

231 goto err;

232 }

233

234 release_cfg_opt(opt);

235 }

236

237 return 0;

238

239 err:

240 fprintf(stderr, "Line %d: error parsing particle definition\n", lineno);

241 release_cfg_opt(opt);

242 return -1;

243 }

244

245 static struct cfgopt *get_cfg_opt(const char *line)

246 {

247 char *buf, *tmp;

248 struct cfgopt *opt;

249

250 line = stripspace((char*)line);

251 if(line[0] == '#' || !line[0]) {

252 return 0; /* skip empty lines and comments */

253 }

254

255 if(!(opt = malloc(sizeof *opt))) {

256 return 0;

257 }

258

259 if(!(opt->valstr = strchr(line, '='))) {

260 release_cfg_opt(opt);

261 return 0;

262 }

263 *opt->valstr++ = 0;

264 opt->valstr = stripspace(opt->valstr);

265

266 /* allocate a working buffer on the stack that could fit the current line */

267 buf = alloca(strlen(line) + 1);

268 strcpy(buf, line);

269 buf = stripspace(buf);

270

271 /* parse the keyframe time specifier if it exists */

272 if((tmp = strchr(buf, '('))) {

273 char *endp;

274 float tval;

275

276 *tmp++ = 0;

277 opt->name = strdup(buf);

278

279 tval = strtod(tmp, &endp);

280 if(endp == tmp) { /* nada ... */

281 opt->tm = 0;

282 } else if(*endp == 's') { /* seconds suffix */

283 opt->tm = (long)(tval * 1000.0f);

284 } else {

285 opt->tm = (long)tval;

286 }

287 } else {

288 opt->name = strdup(buf);

289 opt->tm = 0;

290 }

291

292 if(sscanf(opt->valstr, "[%f %f %f] ~ [%f %f %f]", &opt->val.x, &opt->val.y, &opt->val.z,

293 &opt->valrng.x, &opt->valrng.y, &opt->valrng.z) == 6) {

294 /* value is a vector range */

295 opt->type = OPT_VEC_RANGE;

296

297 } else if(sscanf(opt->valstr, "%f ~ %f", &opt->val.x, &opt->valrng.x) == 2) {

298 /* value is a number range */

299 opt->type = OPT_NUM_RANGE;

300 opt->val.y = opt->val.z = opt->val.x;

301 opt->valrng.y = opt->valrng.z = opt->valrng.x;

302

303 } else if(sscanf(opt->valstr, "[%f %f %f]", &opt->val.x, &opt->val.y, &opt->val.z) == 3) {

304 /* value is a vector */

305 opt->type = OPT_VEC;

306 opt->valrng.x = opt->valrng.y = opt->valrng.z = 0.0f;

307

308 } else if(sscanf(opt->valstr, "%f", &opt->val.x) == 1) {

309 /* value is a number */

310 opt->type = OPT_NUM;

311 opt->val.y = opt->val.z = opt->val.x;

312 opt->valrng.x = opt->valrng.y = opt->valrng.z = 0.0f;

313

314 } else if(sscanf(opt->valstr, "\"%s\"", buf) == 1) {

315 /* just a string... strip the quotes */

316 if(buf[strlen(buf) - 1] == '\"') {

317 buf[strlen(buf) - 1] = 0;

318 }

319 opt->type = OPT_STR;

320 opt->valstr = strdup(buf);

321 } else {

322 /* fuck it ... */

323 release_cfg_opt(opt);

324 return 0;

325 }

326

327 return opt;

328 }

329

330 static void release_cfg_opt(struct cfgopt *opt)

331 {

332 if(opt) {

333 free(opt->name);

334 }

335 }

336

337

338 int psys_save_attr(struct psys_attributes *attr, const char *fname)

339 {

340 FILE *fp;

341 int res;

342

343 if(!(fp = fopen(fname, "w"))) {

344 fprintf(stderr, "%s: failed to write file: %s: %s\n", __func__, fname, strerror(errno));

345 return -1;

346 }

347 res = psys_save_attr_stream(attr, fp);

348 fclose(fp);

349 return res;

350 }

351

352 int psys_save_attr_stream(struct psys_attributes *attr, FILE *fp)

353 {

354 return -1; /* TODO */

355 }

356

357

358 static char *stripspace(char *str)

359 {

360 char *end;

361

362 while(*str && isspace(*str)) {

363 str++;

364 }

365

366 end = str + strlen(str) - 1;

367 while(end >= str && isspace(*end)) {

368 *end-- = 0;

369 }

370 return str;

371 }