libgoatvr: 23a654109494 src/vr

libgoatvr

view src/vr_libovr.c @ 26:23a654109494

Merge

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 14 Mar 2015 23:32:22 +0200
parents	7f9cc8a4d3a5
children	5136dfcea7b1

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 #define 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()) {

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_Chromatic | ovrDistortionCap_TimeWarp |

153 ovrDistortionCap_Overdrive | ovrDistortionCap_NoRestore;

154 #ifdef OVR_OS_LINUX

155 dcaps |= ovrDistortionCap_LinuxDevFullscreen;

156 #endif

157

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

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

160 }

161

162 /* set the eye offset options */

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

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

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

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

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

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

169

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

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

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

173 set_option_vec(optdb, VR_LEYE_OFFSET, reye_offs);

174 set_option_vec(optdb, VR_REYE_OFFSET, leye_offs);

175 } else {

176 set_option_vec(optdb, VR_LEYE_OFFSET, leye_offs);

177 set_option_vec(optdb, VR_REYE_OFFSET, reye_offs);

178 }

179

180

181 #ifdef DISABLE_RETARDED_HEALTH_WARNING

182 ovrhmd_EnableHSWDisplaySDKRender(hmd, 0);

183 #endif

184 }

185

186 static void cleanup(void)

187 {

188 if(hmd) {

189 ovrHmd_Destroy(hmd);

190 ovr_Shutdown();

191 }

192 destroy_options(optdb);

193 }

194

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

196 {

197 float fval;

198

199 switch(type) {

200 case OTYPE_INT:

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

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

203 break;

204

205 case OTYPE_FLOAT:

206 fval = *(float*)valp;

207 set_option_float(optdb, opt, fval);

208 break;

209

210 case OTYPE_VEC:

211 set_option_vec(optdb, opt, valp);

212 break;

213 }

214

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

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

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

218

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

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

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

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

223 }

224

225 return 0;

226 }

227

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

229 {

230 switch(type) {

231 case OTYPE_INT:

232 return get_option_int(optdb, opt, valp);

233 case OTYPE_FLOAT:

234 return get_option_float(optdb, opt, valp);

235 case OTYPE_VEC:

236 return get_option_vec(optdb, opt, valp);

237 }

238 return -1;

239 }

240

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

242 {

243 if(!hmd) {

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

245 return;

246 }

247

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

249 * reuse the one we got last frame.

250 */

251 if(inside_begin_end) {

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

253 }

254

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

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

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

258 }

259

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

261 {

262 if(!hmd) {

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

264 quat[3] = 1.0f;

265 return;

266 }

267

268 /* same as above (translation) */

269 if(inside_begin_end) {

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

271 }

272

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

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

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

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

277 }

278

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

280

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

282 {

283 int i, j;

284 ovrMatrix4f vmat;

285

286 if(!hmd) {

287 memcpy(mat, idmat, sizeof idmat);

288 return;

289 }

290

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

292

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

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

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

296 }

297 }

298 }

299

300 static void begin(int eye)

301 {

302 if(!hmd) return;

303

304 if(!deferred_init_done) {

305 deferred_init();

306 }

307

308 if(!inside_begin_end) {

309 ovrHmd_BeginFrame(hmd, 0);

310 inside_begin_end = 1;

311 }

312 }

313

314 static int present(void)

315 {

316 int cur_prog;

317

318 if(!hmd) return 0;

319

320 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_prog);

321

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

323 inside_begin_end = 0;

324

325 if(cur_prog) {

326 glUseProgram(0);

327 }

328

329 return 1;

330 }

331

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

333 {

334 ovrSizei texsz;

335 ovrRecti rect;

336

337 glBindTexture(GL_TEXTURE_2D, tex);

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

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

340

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

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

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

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

345

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

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

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

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

350 }

351

352 static void recenter(void)

353 {

354 if(hmd) {

355 ovrHmd_RecenterPose(hmd);

356 }

357 }

358

359 struct vr_module *vr_module_libovr(void)

360 {

361 static struct vr_module m;

362

363 if(!m.init) {

364 m.name = "libovr";

365 m.init = init;

366 m.cleanup = cleanup;

367 m.set_option = set_option;

368 m.get_option = get_option;

369 m.translation = translation;

370 m.rotation = rotation;

371 m.proj_matrix = proj_matrix;

372 m.begin = begin;

373 m.present = present;

374 m.set_eye_texture = set_eye_texture;

375 m.recenter = recenter;

376 }

377 return &m;

378 }

379

380 #else /* no libovr */

381

382 static int init(void)

383 {

384 return -1;

385 }

386

387 struct vr_module *vr_module_libovr(void)

388 {

389 static struct vr_module m;

390

391 if(!m.init) {

392 m.name = "libovr";

393 m.init = init;

394 }

395 return &m;

396 }

397

398 #endif /* USE_LIBOVR */