libgoatvr: b536bd21b37f src/vr.c

libgoatvr

view src/vr.c @ 12:b536bd21b37f

added vr_get_def functions

author	John Tsiombikas <nuclear@member.fsf.org>
date	Wed, 24 Sep 2014 23:50:40 +0300
parents	34d4643d61f9
children	27fcd4c2969d

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_EYE_HEIGHT, 1.675);

40 set_option_float(defopt, VR_IPD, 0.064);

41 }

43 if(vrm) {

44 vr_shutdown();

45 }

47 vr_init_modules();

49 nmodules = vr_get_num_modules();

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

51 struct vr_module *m = vr_get_module(i);

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

53 /* add to the active modules array */

54 vr_activate_module(i);

55 }

56 }

58 if(!vr_get_num_active_modules()) {

59 return -1;

60 }

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

63 vr_use_module_named(vrmod_env);

64 } else {

65 vr_use_module(0);

66 }

67 return 0;

68 }

70 void vr_shutdown(void)

71 {

72 vr_clear_modules();

73 vrm = 0;

74 fbtex_rect[0] = fbtex_rect[1] = 0;

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

76 }

78 int vr_module_count(void)

79 {

80 return vr_get_num_active_modules();

81 }

83 const char *vr_module_name(int idx)

84 {

85 struct vr_module *m = vr_get_active_module(idx);

86 if(!m) {

87 return 0;

88 }

89 return m->name;

90 }

92 int vr_use_module(int idx)

93 {

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

95 struct vr_module *m = vr_get_active_module(idx);

96 if(m != vrm) {

97 vrm = m;

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

99 }

100 return 0;

101 }

102 return -1;

103 }

104

105 int vr_use_module_named(const char *name)

106 {

107 int i, count = vr_get_num_active_modules();

108

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

110 struct vr_module *m = vr_get_active_module(i);

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

112 return vr_use_module(i);

113 }

114 }

115 return -1;

116 }

117

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

119 {

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

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

122 } else {

123 set_option_int(defopt, optname, val);

124 }

125 }

126

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

128 {

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

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

131 } else {

132 set_option_float(defopt, optname, val);

133 }

134 }

135

136 int vr_geti(const char *optname)

137 {

138 int res = 0;

139

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

141 get_option_int(defopt, optname, &res); /* fallback */

142 }

143 return res;

144 }

145

146 float vr_getf(const char *optname)

147 {

148 float res = 0.0f;

149

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

151 get_option_float(defopt, optname, &res); /* fallback */

152 }

153 return res;

154 }

155

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

157 {

158 int res = 0;

159

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

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

162 return def_val;

163 }

164 }

165 return res;

166 }

167

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

169 {

170 float res = 0.0f;

171

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

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

174 return def_val;

175 }

176 }

177 return res;

178 }

179

180 int vr_view_translation(int eye, float *vec)

181 {

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

183 vrm->translation(eye, vec);

184 return 1;

185 }

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

187 return 0;

188 }

189

190 int vr_view_rotation(int eye, float *quat)

191 {

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

193 vrm->rotation(eye, quat);

194 return 1;

195 }

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

197 quat[3] = 1.0f;

198 return 0;

199 }

200

201 int vr_view_matrix(int eye, float *mat)

202 {

203 int have_trans, have_rot;

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

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

206

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

208 vrm->view_matrix(eye, mat);

209 return 1;

210 }

211

212 have_trans = vr_view_translation(eye, offs);

213 have_rot = vr_view_rotation(eye, quat);

214

215 if(!have_trans && !have_rot) {

216 memcpy(mat, idmat, sizeof idmat);

217 return 0;

218 }

219

220 offs[0] = -offs[0];

221 offs[1] = -offs[1];

222 offs[2] = -offs[2];

223

224 vrimp_translation_matrix(offs, tmat);

225 vrimp_rotation_matrix(quat, rmat);

226 vrimp_mult_matrix(mat, tmat, rmat);

227 return 1;

228 }

229

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

231 {

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

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

234 return 1;

235 }

236 memcpy(mat, idmat, sizeof idmat);

237 return 0;

238 }

239

240 void vr_begin(int eye)

241 {

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

243 vrm->begin(eye);

244 }

245 }

246

247 void vr_end(void)

248 {

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

250 vrm->end();

251 }

252 }

253

254 int vr_swap_buffers(void)

255 {

256 int res = 0;

257

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

259 res = vrm->present();

260 }

261

262 if(!res) {

263 fallback_present();

264 vrimp_swap_buffers();

265 }

266 return 0;

267 }

268

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

270 {

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

272

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

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

275 }

276

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

278 {

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

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

281 } else {

282 rtarg[eye].tex = tex;

283 rtarg[eye].umin = umin;

284 rtarg[eye].umax = umax;

285 rtarg[eye].vmin = vmin;

286 rtarg[eye].vmax = vmax;

287 }

288 }

289

290 void vr_recenter(void)

291 {

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

293 vrm->recenter();

294 }

295 }

296

297 static void fallback_present(void)

298 {

299 int i;

300

301 glPushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT);

302

303 glDisable(GL_LIGHTING);

304 glDisable(GL_DEPTH_TEST);

305 glDisable(GL_ALPHA_TEST);

306 glDisable(GL_STENCIL_TEST);

307 glDisable(GL_FOG);

308

309 glEnable(GL_TEXTURE_2D);

310

311 glMatrixMode(GL_MODELVIEW);

312 glPushMatrix();

313 glLoadIdentity();

314 glMatrixMode(GL_PROJECTION);

315 glPushMatrix();

316 glLoadIdentity();

317

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

319 float x0 = i == 0 ? -1 : 0;

320 float x1 = i == 0 ? 0 : 1;

321

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

323

324 glBegin(GL_QUADS);

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

326 glVertex2f(x0, -1);

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

328 glVertex2f(x1, -1);

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

330 glVertex2f(x1, 1);

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

332 glVertex2f(x0, 1);

333 glEnd();

334 }

335

336 glPopMatrix();

337 glMatrixMode(GL_MODELVIEW);

338 glPopMatrix();

339

340 glPopAttrib();

341 }