libgoatvr: 3de7339841d0 src/vr.c

libgoatvr

view src/vr.c @ 17:3de7339841d0

option for the null module fallback presentation to show one or both eye views

author	John Tsiombikas <nuclear@member.fsf.org>
date	Thu, 25 Sep 2014 17:14:04 +0300
parents	b2d902fff68d
children	1067274dc780

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <string.h>

4 #include "opengl.h"

5 #include "vr.h"

6 #include "vr_impl.h"

7 #include "mathutil.h"

10 static void fallback_present(void);

13 static struct vr_module *vrm;

14 static float idmat[] = {

15 1, 0, 0, 0,

16 0, 1, 0, 0,

17 0, 0, 1, 0,

18 0, 0, 0, 1

19 };

20 static float fbtex_rect[] = {

21 0, 0, 1, 1

22 };

24 static void *defopt; /* default options db */

26 static struct {

27 float umin, umax, vmin, vmax;

28 int tex;

29 } rtarg[2];

32 int vr_init(void)

33 {

34 int i, nmodules;

35 char *vrmod_env;

37 /* create the default options database */

38 if(!defopt && (defopt = create_options())) {

39 set_option_float(defopt, VR_RENDER_RES_SCALE, 1.0);

40 set_option_float(defopt, VR_EYE_HEIGHT, 1.675);

41 set_option_float(defopt, VR_IPD, 0.064);

42 set_option_int(defopt, VR_NULL_STEREO, 0);

43 }

45 if(vrm) {

46 vr_shutdown();

47 }

49 vr_init_modules();

51 nmodules = vr_get_num_modules();

52 for(i=0; i<nmodules; i++) {

53 struct vr_module *m = vr_get_module(i);

54 if(m->init() != -1) {

55 /* add to the active modules array */

56 vr_activate_module(i);

57 }

58 }

60 if(!vr_get_num_active_modules()) {

61 return -1;

62 }

64 if((vrmod_env = getenv("VR_MODULE"))) {

65 vr_use_module_named(vrmod_env);

66 } else {

67 vr_use_module(0);

68 }

69 return 0;

70 }

72 void vr_shutdown(void)

73 {

74 vr_clear_modules();

75 vrm = 0;

76 fbtex_rect[0] = fbtex_rect[1] = 0;

77 fbtex_rect[2] = fbtex_rect[3] = 1;

78 }

80 int vr_module_count(void)

81 {

82 return vr_get_num_active_modules();

83 }

85 const char *vr_module_name(int idx)

86 {

87 struct vr_module *m = vr_get_active_module(idx);

88 if(!m) {

89 return 0;

90 }

91 return m->name;

92 }

94 int vr_use_module(int idx)

95 {

96 if(idx >= 0 && idx < vr_get_num_active_modules()) {

97 struct vr_module *m = vr_get_active_module(idx);

98 if(m != vrm) {

99 vrm = m;

100 printf("using vr module: %s\n", vrm->name);

101 }

102 return 0;

103 }

104 return -1;

105 }

106

107 int vr_use_module_named(const char *name)

108 {

109 int i, count = vr_get_num_active_modules();

110

111 for(i=0; i<count; i++) {

112 struct vr_module *m = vr_get_active_module(i);

113 if(strcmp(m->name, name) == 0) {

114 return vr_use_module(i);

115 }

116 }

117 return -1;

118 }

119

120 void vr_seti(const char *optname, int val)

121 {

122 if(vrm && vrm->set_option) {

123 vrm->set_option(optname, OTYPE_INT, &val);

124 } else {

125 set_option_int(defopt, optname, val);

126 }

127 }

128

129 void vr_setf(const char *optname, float val)

130 {

131 if(vrm && vrm->set_option) {

132 vrm->set_option(optname, OTYPE_FLOAT, &val);

133 } else {

134 set_option_float(defopt, optname, val);

135 }

136 }

137

138 static int def_option_int(const char *optname)

139 {

140 int res = 0;

141 int left, right;

142

143 if(strcmp(optname, VR_RENDER_XRES) == 0) {

144 if(vrm && vrm->get_option && vrm->get_option(optname, OTYPE_INT, &left) != -1 &&

145 vrm->get_option(optname, OTYPE_INT, &right) != -1) {

146 return left + right;

147 }

148 } else if(strcmp(optname, VR_RENDER_YRES) == 0) {

149 if(vrm && vrm->get_option && vrm->get_option(optname, OTYPE_INT, &left) != -1 &&

150 vrm->get_option(optname, OTYPE_INT, &right) != -1) {

151 return left > right ? left : right;

152 }

153 }

154

155 get_option_int(defopt, optname, &res);

156 return res;

157 }

158

159 static float def_option_float(const char *optname)

160 {

161 int res = 0;

162

163 if(strcmp(optname, VR_RENDER_XRES) == 0 || strcmp(optname, VR_RENDER_YRES) == 0) {

164 return (float)def_option_int(optname);

165 }

166

167 get_option_float(defopt, optname, &res);

168 return res;

169 }

170

171 int vr_geti(const char *optname)

172 {

173 int res = 0;

174

175 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_INT, &res) == -1) {

176 res = def_option_int(optname);

177 }

178 return res;

179 }

180

181 float vr_getf(const char *optname)

182 {

183 float res = 0.0f;

184

185 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_FLOAT, &res) == -1) {

186 res = def_option_float(optname);

187 }

188 return res;

189 }

190

191 int vr_geti_def(const char *optname, int def_val)

192 {

193 int res = 0;

194

195 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_INT, &res) == -1) {

196 if(get_option_int(defopt, optname, &res) == -1) { /* fallback */

197 return def_val;

198 }

199 }

200 return res;

201 }

202

203 float vr_getf_def(const char *optname, float def_val)

204 {

205 float res = 0.0f;

206

207 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_FLOAT, &res) == -1) {

208 if(get_option_float(defopt, optname, &res) == -1) { /* fallback */

209 return def_val;

210 }

211 }

212 return res;

213 }

214

215 int vr_view_translation(int eye, float *vec)

216 {

217 if(vrm && vrm->translation) {

218 vrm->translation(eye, vec);

219 return 1;

220 }

221 vec[0] = vec[1] = vec[2] = 0.0f;

222 return 0;

223 }

224

225 int vr_view_rotation(int eye, float *quat)

226 {

227 if(vrm && vrm->rotation) {

228 vrm->rotation(eye, quat);

229 return 1;

230 }

231 quat[0] = quat[1] = quat[2] = 0.0f;

232 quat[3] = 1.0f;

233 return 0;

234 }

235

236 int vr_view_matrix(int eye, float *mat)

237 {

238 int have_trans, have_rot;

239 float offs[3], quat[4];

240 float rmat[16], tmat[16];

241

242 if(vrm && vrm->view_matrix) {

243 vrm->view_matrix(eye, mat);

244 return 1;

245 }

246

247 have_trans = vr_view_translation(eye, offs);

248 have_rot = vr_view_rotation(eye, quat);

249

250 if(!have_trans && !have_rot) {

251 memcpy(mat, idmat, sizeof idmat);

252 return 0;

253 }

254

255 offs[0] = -offs[0];

256 offs[1] = -offs[1];

257 offs[2] = -offs[2];

258

259 vrimp_translation_matrix(offs, tmat);

260 vrimp_rotation_matrix(quat, rmat);

261 vrimp_mult_matrix(mat, tmat, rmat);

262 return 1;

263 }

264

265 int vr_proj_matrix(int eye, float znear, float zfar, float *mat)

266 {

267 if(vrm && vrm->proj_matrix) {

268 vrm->proj_matrix(eye, znear, zfar, mat);

269 return 1;

270 }

271 memcpy(mat, idmat, sizeof idmat);

272 return 0;

273 }

274

275 void vr_begin(int eye)

276 {

277 if(vrm && vrm->begin) {

278 vrm->begin(eye);

279 }

280 }

281

282 void vr_end(void)

283 {

284 if(vrm && vrm->end) {

285 vrm->end();

286 }

287 }

288

289 int vr_swap_buffers(void)

290 {

291 int res = 0;

292

293 if(vrm && vrm->present) {

294 res = vrm->present();

295 }

296

297 if(!res) {

298 fallback_present();

299 vrimp_swap_buffers();

300 }

301 return 0;

302 }

303

304 void vr_output_texture(unsigned int tex, float umin, float vmin, float umax, float vmax)

305 {

306 float halfu = (umax + umin) * 0.5f;

307

308 vr_output_texture_eye(VR_EYE_LEFT, tex, umin, vmin, halfu, vmax);

309 vr_output_texture_eye(VR_EYE_RIGHT, tex, halfu, vmin, umax, vmax);

310 }

311

312 void vr_output_texture_eye(int eye, unsigned int tex, float umin, float vmin, float umax, float vmax)

313 {

314 if(vrm && vrm->set_eye_texture) {

315 vrm->set_eye_texture(eye, tex, umin, vmin, umax, vmax);

316 } else {

317 rtarg[eye].tex = tex;

318 rtarg[eye].umin = umin;

319 rtarg[eye].umax = umax;

320 rtarg[eye].vmin = vmin;

321 rtarg[eye].vmax = vmax;

322 }

323 }

324

325 void vr_recenter(void)

326 {

327 if(vrm && vrm->recenter) {

328 vrm->recenter();

329 }

330 }

331

332 static void fallback_present(void)

333 {

334 int i, show_both = vr_geti(VR_NULL_STEREO);

335

336 glPushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT);

337

338 glDisable(GL_LIGHTING);

339 glDisable(GL_DEPTH_TEST);

340 glDisable(GL_ALPHA_TEST);

341 glDisable(GL_STENCIL_TEST);

342 glDisable(GL_FOG);

343

344 glEnable(GL_TEXTURE_2D);

345

346 glMatrixMode(GL_MODELVIEW);

347 glPushMatrix();

348 glLoadIdentity();

349 glMatrixMode(GL_PROJECTION);

350 glPushMatrix();

351 glLoadIdentity();

352

353 for(i=0; i<2; i++) {

354 float x0, x1;

355

356 if(show_both) {

357 x0 = i == 0 ? -1 : 0;

358 x1 = i == 0 ? 0 : 1;

359 } else {

360 x0 = -1;

361 x1 = 1;

362 }

363

364 glBindTexture(GL_TEXTURE_2D, rtarg[i].tex);

365

366 glBegin(GL_QUADS);

367 glTexCoord2f(rtarg[i].umin, rtarg[i].vmin);

368 glVertex2f(x0, -1);

369 glTexCoord2f(rtarg[i].umax, rtarg[i].vmin);

370 glVertex2f(x1, -1);

371 glTexCoord2f(rtarg[i].umax, rtarg[i].vmax);

372 glVertex2f(x1, 1);

373 glTexCoord2f(rtarg[i].umin, rtarg[i].vmax);

374 glVertex2f(x0, 1);

375 glEnd();

376

377 if(!show_both) break;

378 }

379

380 glPopMatrix();

381 glMatrixMode(GL_MODELVIEW);

382 glPopMatrix();

383

384 glPopAttrib();

385 }