libgoatvr: 27fcd4c2969d src/vr.c

libgoatvr

view src/vr.c @ 15:27fcd4c2969d

added VR_EYE_RES_SCALE option

author	John Tsiombikas <nuclear@member.fsf.org>
date	Thu, 25 Sep 2014 08:50:50 +0300
parents	b536bd21b37f
children	b2d902fff68d

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_RES_SCALE, 1.0);

40 set_option_float(defopt, VR_EYE_HEIGHT, 1.675);

41 set_option_float(defopt, VR_IPD, 0.064);

42 }

44 if(vrm) {

45 vr_shutdown();

46 }

48 vr_init_modules();

50 nmodules = vr_get_num_modules();

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

52 struct vr_module *m = vr_get_module(i);

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

54 /* add to the active modules array */

55 vr_activate_module(i);

56 }

57 }

59 if(!vr_get_num_active_modules()) {

60 return -1;

61 }

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

64 vr_use_module_named(vrmod_env);

65 } else {

66 vr_use_module(0);

67 }

68 return 0;

69 }

71 void vr_shutdown(void)

72 {

73 vr_clear_modules();

74 vrm = 0;

75 fbtex_rect[0] = fbtex_rect[1] = 0;

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

77 }

79 int vr_module_count(void)

80 {

81 return vr_get_num_active_modules();

82 }

84 const char *vr_module_name(int idx)

85 {

86 struct vr_module *m = vr_get_active_module(idx);

87 if(!m) {

88 return 0;

89 }

90 return m->name;

91 }

93 int vr_use_module(int idx)

94 {

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

96 struct vr_module *m = vr_get_active_module(idx);

97 if(m != vrm) {

98 vrm = m;

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

100 }

101 return 0;

102 }

103 return -1;

104 }

105

106 int vr_use_module_named(const char *name)

107 {

108 int i, count = vr_get_num_active_modules();

109

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

111 struct vr_module *m = vr_get_active_module(i);

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

113 return vr_use_module(i);

114 }

115 }

116 return -1;

117 }

118

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

120 {

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

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

123 } else {

124 set_option_int(defopt, optname, val);

125 }

126 }

127

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

129 {

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

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

132 } else {

133 set_option_float(defopt, optname, val);

134 }

135 }

136

137 int vr_geti(const char *optname)

138 {

139 int res = 0;

140

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

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

143 }

144 return res;

145 }

146

147 float vr_getf(const char *optname)

148 {

149 float res = 0.0f;

150

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

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

153 }

154 return res;

155 }

156

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

158 {

159 int res = 0;

160

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

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

163 return def_val;

164 }

165 }

166 return res;

167 }

168

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

170 {

171 float res = 0.0f;

172

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

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

175 return def_val;

176 }

177 }

178 return res;

179 }

180

181 int vr_view_translation(int eye, float *vec)

182 {

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

184 vrm->translation(eye, vec);

185 return 1;

186 }

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

188 return 0;

189 }

190

191 int vr_view_rotation(int eye, float *quat)

192 {

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

194 vrm->rotation(eye, quat);

195 return 1;

196 }

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

198 quat[3] = 1.0f;

199 return 0;

200 }

201

202 int vr_view_matrix(int eye, float *mat)

203 {

204 int have_trans, have_rot;

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

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

207

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

209 vrm->view_matrix(eye, mat);

210 return 1;

211 }

212

213 have_trans = vr_view_translation(eye, offs);

214 have_rot = vr_view_rotation(eye, quat);

215

216 if(!have_trans && !have_rot) {

217 memcpy(mat, idmat, sizeof idmat);

218 return 0;

219 }

220

221 offs[0] = -offs[0];

222 offs[1] = -offs[1];

223 offs[2] = -offs[2];

224

225 vrimp_translation_matrix(offs, tmat);

226 vrimp_rotation_matrix(quat, rmat);

227 vrimp_mult_matrix(mat, tmat, rmat);

228 return 1;

229 }

230

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

232 {

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

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

235 return 1;

236 }

237 memcpy(mat, idmat, sizeof idmat);

238 return 0;

239 }

240

241 void vr_begin(int eye)

242 {

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

244 vrm->begin(eye);

245 }

246 }

247

248 void vr_end(void)

249 {

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

251 vrm->end();

252 }

253 }

254

255 int vr_swap_buffers(void)

256 {

257 int res = 0;

258

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

260 res = vrm->present();

261 }

262

263 if(!res) {

264 fallback_present();

265 vrimp_swap_buffers();

266 }

267 return 0;

268 }

269

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

271 {

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

273

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

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

276 }

277

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

279 {

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

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

282 } else {

283 rtarg[eye].tex = tex;

284 rtarg[eye].umin = umin;

285 rtarg[eye].umax = umax;

286 rtarg[eye].vmin = vmin;

287 rtarg[eye].vmax = vmax;

288 }

289 }

290

291 void vr_recenter(void)

292 {

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

294 vrm->recenter();

295 }

296 }

297

298 static void fallback_present(void)

299 {

300 int i;

301

302 glPushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT);

303

304 glDisable(GL_LIGHTING);

305 glDisable(GL_DEPTH_TEST);

306 glDisable(GL_ALPHA_TEST);

307 glDisable(GL_STENCIL_TEST);

308 glDisable(GL_FOG);

309

310 glEnable(GL_TEXTURE_2D);

311

312 glMatrixMode(GL_MODELVIEW);

313 glPushMatrix();

314 glLoadIdentity();

315 glMatrixMode(GL_PROJECTION);

316 glPushMatrix();

317 glLoadIdentity();

318

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

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

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

322

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

324

325 glBegin(GL_QUADS);

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

327 glVertex2f(x0, -1);

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

329 glVertex2f(x1, -1);

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

331 glVertex2f(x1, 1);

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

333 glVertex2f(x0, 1);

334 glEnd();

335 }

336

337 glPopMatrix();

338 glMatrixMode(GL_MODELVIEW);

339 glPopMatrix();

340

341 glPopAttrib();

342 }