libgoatvr: 5136dfcea7b1 src/vr

libgoatvr

view src/vr_libovr.c @ 28:5136dfcea7b1

ported to OVR 0.5.0.1

author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 06 Apr 2015 05:17:11 +0300
parents	d659cbedde1d
children	ddaa9c764030

line source

1 #ifdef WIN32

2 #define OVR_OS_WIN32

3 #elif defined(__APPLE__)

4 #define OVR_OS_MAC

5 #else

6 #define OVR_OS_LINUX

7 #endif

9 #include "vr_impl.h"

11 #ifdef USE_LIBOVR

12 #include <stdio.h>

13 #include <stdlib.h>

14 #include <string.h>

15 #include <assert.h>

16 #include "opt.h"

18 #include <OVR_CAPI.h>

19 #include <OVR_CAPI_GL.h>

21 #ifdef OVR_OS_LINUX

22 #include <GL/glx.h>

23 #endif

25 /* undef this if you want the retarded health and safety warning screen */

26 #undef DISABLE_RETARDED_HEALTH_WARNING

28 /* just dropping the prototype here to avoid including CAPI_HSWDisplay.h */

29 OVR_EXPORT void ovrhmd_EnableHSWDisplaySDKRender(ovrHmd hmd, ovrBool enabled);

31 static ovrHmd hmd;

32 static void *optdb;

33 static ovrEyeRenderDesc eye_render_desc[2];

34 static ovrSizei eye_res[2];

35 static ovrGLTexture eye_tex[2];

36 static ovrFovPort eye_fov[2];

37 static ovrPosef pose[2] = {

38 { {0, 0, 0, 1}, {0, 0, 0} },

39 { {0, 0, 0, 1}, {0, 0, 0} }

40 };

41 static int deferred_init_done;

43 static int inside_begin_end;

45 static int init(void)

46 {

47 int i, num_hmds;

48 int use_fake = 0;

49 ovrTrackingCaps tracking;

51 if(!ovr_Initialize(0)) {

52 return -1;

53 }

54 printf("initialized LibOVR %s\n", ovr_GetVersionString());

56 if(!(num_hmds = ovrHmd_Detect())) {

57 if(getenv("VR_LIBOVR_FAKE")) {

58 use_fake = 1;

59 num_hmds = 1;

60 } else {

61 ovr_Shutdown();

62 return -1;

63 }

64 }

65 printf("%d Oculus HMD(s) found\n", num_hmds);

67 hmd = 0;

68 for(i=0; i<num_hmds; i++) {

69 ovrHmd h = use_fake ? ovrHmd_CreateDebug(ovrHmd_DK2) : ovrHmd_Create(i);

70 if(!h) {

71 break;

72 }

73 printf(" [%d]: %s - %s\n", i, h->Manufacturer, h->ProductName);

75 if(!hmd) {

76 hmd = h;

77 } else {

78 ovrHmd_Destroy(h);

79 }

80 }

82 if(!hmd) {

83 fprintf(stderr, "failed to initialize any Oculus HMDs\n");

84 return -1;

85 }

87 tracking = ovrTrackingCap_Orientation | ovrTrackingCap_Position |

88 ovrTrackingCap_MagYawCorrection;

89 ovrHmd_ConfigureTracking(hmd, tracking, 0);

91 eye_fov[0] = hmd->DefaultEyeFov[0];

92 eye_fov[1] = hmd->DefaultEyeFov[1];

94 eye_res[0] = ovrHmd_GetFovTextureSize(hmd, ovrEye_Left, eye_fov[0], 1.0);

95 eye_res[1] = ovrHmd_GetFovTextureSize(hmd, ovrEye_Right, eye_fov[1], 1.0);

97 /* create the options database */

98 if((optdb = create_options())) {

99 set_option_int(optdb, VR_DISPLAY_WIDTH, hmd->Resolution.w);

100 set_option_int(optdb, VR_DISPLAY_HEIGHT, hmd->Resolution.h);

101 set_option_int(optdb, VR_LEYE_XRES, eye_res[0].w);

102 set_option_int(optdb, VR_LEYE_YRES, eye_res[0].h);

103 set_option_int(optdb, VR_REYE_XRES, eye_res[1].w);

104 set_option_int(optdb, VR_REYE_YRES, eye_res[1].h);

105 set_option_float(optdb, VR_RENDER_RES_SCALE, 1.0);

106 set_option_float(optdb, VR_EYE_HEIGHT, ovrHmd_GetFloat(hmd, OVR_KEY_EYE_HEIGHT, OVR_DEFAULT_EYE_HEIGHT));

107 set_option_float(optdb, VR_IPD, ovrHmd_GetFloat(hmd, OVR_KEY_IPD, OVR_DEFAULT_IPD));

108 set_option_int(optdb, VR_WIN_XOFFS, hmd->WindowsPos.x);

109 set_option_int(optdb, VR_WIN_YOFFS, hmd->WindowsPos.y);

110 }

111

112 deferred_init_done = 0;

113 return 0;

114 }

115

116 static void deferred_init(void)

117 {

118 union ovrGLConfig glcfg;

119 unsigned int dcaps;

120 void *win = 0;

121 float leye_offs[3], reye_offs[3];

122

123 deferred_init_done = 1;

124

125 memset(&glcfg, 0, sizeof glcfg);

126 glcfg.OGL.Header.API = ovrRenderAPI_OpenGL;

127 glcfg.OGL.Header.BackBufferSize = hmd->Resolution;

128 glcfg.OGL.Header.Multisample = 1;

129 #ifdef WIN32

130 win = GetActiveWindow();

131 glcfg.OGL.Window = win;

132 glcfg.OGL.DC = wglGetCurrentDC();

133 #else

134 glcfg.OGL.Disp = glXGetCurrentDisplay();

135 win = (void*)glXGetCurrentDrawable();

136

137 /* on linux the Oculus SDK docs are instructing users to leave the DK2 screen in

138 * portrait mode. So we'll have to flip width and height

139 */

140 glcfg.OGL.Header.BackBufferSize.w = hmd->Resolution.h;

141 glcfg.OGL.Header.BackBufferSize.h = hmd->Resolution.w;

142 #endif

143

144 if(!(hmd->HmdCaps & ovrHmdCap_ExtendDesktop)) {

145 ovrHmd_AttachToWindow(hmd, win, 0, 0);

146 printf("running in \"direct-to-rift\" mode\n");

147 } else {

148 printf("running in \"extended desktop\" mode\n");

149 }

150 ovrHmd_SetEnabledCaps(hmd, ovrHmdCap_LowPersistence | ovrHmdCap_DynamicPrediction);

151

152 dcaps = ovrDistortionCap_TimeWarp | ovrDistortionCap_Overdrive;

153 #ifdef OVR_OS_LINUX

154 dcaps |= ovrDistortionCap_LinuxDevFullscreen;

155 #endif

156

157 if(!ovrHmd_ConfigureRendering(hmd, &glcfg.Config, dcaps, eye_fov, eye_render_desc)) {

158 fprintf(stderr, "failed to configure LibOVR distortion renderer\n");

159 }

160

161 /* set the eye offset options */

162 leye_offs[0] = eye_render_desc[ovrEye_Left].HmdToEyeViewOffset.x;

163 leye_offs[1] = eye_render_desc[ovrEye_Left].HmdToEyeViewOffset.y;

164 leye_offs[2] = eye_render_desc[ovrEye_Left].HmdToEyeViewOffset.z;

165 reye_offs[0] = eye_render_desc[ovrEye_Right].HmdToEyeViewOffset.x;

166 reye_offs[1] = eye_render_desc[ovrEye_Right].HmdToEyeViewOffset.y;

167 reye_offs[2] = eye_render_desc[ovrEye_Right].HmdToEyeViewOffset.z;

168

169 /* sanity check ... on linux it seems I'm getting the eye offsets reversed for some reason */

170 if(leye_offs[0] > reye_offs[0]) {

171 fprintf(stderr, "BUG %s:%d: eye offset reversed?! fixing but wtf...\n", __FILE__, __LINE__);

172 set_option_vec(optdb, VR_LEYE_OFFSET, reye_offs);

173 set_option_vec(optdb, VR_REYE_OFFSET, leye_offs);

174 } else {

175 set_option_vec(optdb, VR_LEYE_OFFSET, leye_offs);

176 set_option_vec(optdb, VR_REYE_OFFSET, reye_offs);

177 }

178

179

180 #ifdef DISABLE_RETARDED_HEALTH_WARNING

181 ovrhmd_EnableHSWDisplaySDKRender(hmd, 0);

182 #endif

183 }

184

185 static void cleanup(void)

186 {

187 if(hmd) {

188 ovrHmd_Destroy(hmd);

189 ovr_Shutdown();

190 }

191 destroy_options(optdb);

192 }

193

194 static int set_option(const char *opt, enum opt_type type, void *valp)

195 {

196 float fval;

197

198 switch(type) {

199 case OTYPE_INT:

200 fval = (float)*(int*)valp;

201 set_option_int(optdb, opt, *(int*)valp);

202 break;

203

204 case OTYPE_FLOAT:

205 fval = *(float*)valp;

206 set_option_float(optdb, opt, fval);

207 break;

208

209 case OTYPE_VEC:

210 set_option_vec(optdb, opt, valp);

211 break;

212 }

213

214 if(hmd && strcmp(opt, VR_RENDER_RES_SCALE) == 0) {

215 eye_res[0] = ovrHmd_GetFovTextureSize(hmd, ovrEye_Left, eye_fov[0], fval);

216 eye_res[1] = ovrHmd_GetFovTextureSize(hmd, ovrEye_Right, eye_fov[1], fval);

217

218 set_option_int(optdb, VR_LEYE_XRES, eye_res[0].w);

219 set_option_int(optdb, VR_LEYE_YRES, eye_res[0].h);

220 set_option_int(optdb, VR_REYE_XRES, eye_res[1].w);

221 set_option_int(optdb, VR_REYE_YRES, eye_res[1].h);

222 }

223

224 return 0;

225 }

226

227 static int get_option(const char *opt, enum opt_type type, void *valp)

228 {

229 switch(type) {

230 case OTYPE_INT:

231 return get_option_int(optdb, opt, valp);

232 case OTYPE_FLOAT:

233 return get_option_float(optdb, opt, valp);

234 case OTYPE_VEC:

235 return get_option_vec(optdb, opt, valp);

236 }

237 return -1;

238 }

239

240 static void translation(int eye, float *vec)

241 {

242 if(!hmd) {

243 vec[0] = vec[1] = vec[2] = 0;

244 return;

245 }

246

247 /* if we're inside the begin-end block we can get a fresh pose, otherwise we'll just

248 * reuse the one we got last frame.

249 */

250 if(inside_begin_end) {

251 pose[eye] = ovrHmd_GetHmdPosePerEye(hmd, eye == VR_EYE_LEFT ? ovrEye_Left : ovrEye_Right);

252 }

253

254 vec[0] = pose[eye].Position.x;

255 vec[1] = pose[eye].Position.y;

256 vec[2] = pose[eye].Position.z;

257 }

258

259 static void rotation(int eye, float *quat)

260 {

261 if(!hmd) {

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

263 quat[3] = 1.0f;

264 return;

265 }

266

267 /* same as above (translation) */

268 if(inside_begin_end) {

269 pose[eye] = ovrHmd_GetHmdPosePerEye(hmd, eye == VR_EYE_LEFT ? ovrEye_Left : ovrEye_Right);

270 }

271

272 quat[0] = pose[eye].Orientation.x;

273 quat[1] = pose[eye].Orientation.y;

274 quat[2] = pose[eye].Orientation.z;

275 quat[3] = pose[eye].Orientation.w;

276 }

277

278 static const float idmat[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};

279

280 static void proj_matrix(int eye, float znear, float zfar, float *mat)

281 {

282 int i, j;

283 ovrMatrix4f vmat;

284

285 if(!hmd) {

286 memcpy(mat, idmat, sizeof idmat);

287 return;

288 }

289

290 vmat = ovrMatrix4f_Projection(eye_render_desc[eye].Fov, znear, zfar, 1);

291

292 for(i=0; i<4; i++) {

293 for(j=0; j<4; j++) {

294 *mat++ = vmat.M[j][i];

295 }

296 }

297 }

298

299 static void begin(int eye)

300 {

301 if(!hmd) return;

302

303 if(!deferred_init_done) {

304 deferred_init();

305 }

306

307 if(!inside_begin_end) {

308 ovrHmd_BeginFrame(hmd, 0);

309 inside_begin_end = 1;

310 }

311 }

312

313 static int present(void)

314 {

315 int cur_prog;

316

317 if(!hmd) return 0;

318

319 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_prog);

320

321 ovrHmd_EndFrame(hmd, pose, &eye_tex[0].Texture);

322 inside_begin_end = 0;

323

324 if(cur_prog) {

325 /*glUseProgram(0);*/

326 }

327

328 return 1;

329 }

330

331 static void set_eye_texture(int eye, unsigned int tex, float umin, float vmin, float umax, float vmax)

332 {

333 ovrSizei texsz;

334 ovrRecti rect;

335

336 glBindTexture(GL_TEXTURE_2D, tex);

337 glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &texsz.w);

338 glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &texsz.h);

339

340 rect.Pos.x = (int)(umin * texsz.w);

341 rect.Pos.y = (int)(vmin * texsz.h);

342 rect.Size.w = (int)((umax - umin) * texsz.w);

343 rect.Size.h = (int)((vmax - vmin) * texsz.h);

344

345 eye_tex[eye].OGL.Header.API = ovrRenderAPI_OpenGL;

346 eye_tex[eye].OGL.Header.TextureSize = texsz;

347 eye_tex[eye].OGL.Header.RenderViewport = rect;

348 eye_tex[eye].OGL.TexId = tex;

349 }

350

351 static void recenter(void)

352 {

353 if(hmd) {

354 ovrHmd_RecenterPose(hmd);

355 }

356 }

357

358 struct vr_module *vr_module_libovr(void)

359 {

360 static struct vr_module m;

361

362 if(!m.init) {

363 m.name = "libovr";

364 m.init = init;

365 m.cleanup = cleanup;

366 m.set_option = set_option;

367 m.get_option = get_option;

368 m.translation = translation;

369 m.rotation = rotation;

370 m.proj_matrix = proj_matrix;

371 m.begin = begin;

372 m.present = present;

373 m.set_eye_texture = set_eye_texture;

374 m.recenter = recenter;

375 }

376 return &m;

377 }

378

379 #else /* no libovr */

380

381 static int init(void)

382 {

383 return -1;

384 }

385

386 struct vr_module *vr_module_libovr(void)

387 {

388 static struct vr_module m;

389

390 if(!m.init) {

391 m.name = "libovr";

392 m.init = init;

393 }

394 return &m;

395 }

396

397 #endif /* USE_LIBOVR */