libgoatvr: ec6edfe7774c src/vr

libgoatvr

view src/vr_libovr.c @ 31:ec6edfe7774c

forgot to add the glext.h file

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sun, 12 Apr 2015 02:02:04 +0300
parents	ddaa9c764030
children

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 "opengl.h"

17 #include "opt.h"

19 #include <OVR_CAPI.h>

20 #include <OVR_CAPI_GL.h>

22 static PFNGLUSEPROGRAMPROC gl_use_program;

24 static ovrHmd hmd;

25 static void *optdb;

26 static ovrEyeRenderDesc eye_render_desc[2];

27 static ovrSizei eye_res[2];

28 static ovrGLTexture eye_tex[2];

29 static ovrFovPort eye_fov[2];

30 static ovrPosef pose[2] = {

31 { {0, 0, 0, 1}, {0, 0, 0} },

32 { {0, 0, 0, 1}, {0, 0, 0} }

33 };

34 static int deferred_init_done;

36 static int inside_begin_end;

38 static int init(void)

39 {

40 int i, num_hmds;

41 int use_fake = 0;

42 ovrTrackingCaps tracking;

44 if(!ovr_Initialize(0)) {

45 return -1;

46 }

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

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

50 if(getenv("VR_LIBOVR_FAKE")) {

51 use_fake = 1;

52 num_hmds = 1;

53 } else {

54 ovr_Shutdown();

55 return -1;

56 }

57 }

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

60 hmd = 0;

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

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

63 if(!h) {

64 break;

65 }

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

68 if(!hmd) {

69 hmd = h;

70 } else {

71 ovrHmd_Destroy(h);

72 }

73 }

75 if(!hmd) {

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

77 return -1;

78 }

80 tracking = ovrTrackingCap_Orientation | ovrTrackingCap_Position |

81 ovrTrackingCap_MagYawCorrection;

82 ovrHmd_ConfigureTracking(hmd, tracking, 0);

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

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

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

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

90 /* create the options database */

91 if((optdb = create_options())) {

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

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

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

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

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

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

98 set_option_int(optdb, VR_RENDER_XRES, eye_res[0].w + eye_res[1].w);

99 set_option_int(optdb, VR_RENDER_YRES, eye_res[0].h > eye_res[1].h ? eye_res[0].h : eye_res[1].h);

100 set_option_float(optdb, VR_RENDER_RES_SCALE, 1.0);

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

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

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

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

105 }

106

107 if(!(gl_use_program = (PFNGLUSEPROGRAMPROC)vrimp_glfunc("glUseProgram"))) {

108 gl_use_program = (PFNGLUSEPROGRAMPROC)vrimp_glfunc("glUseProgramObjectARB");

109 }

110

111 deferred_init_done = 0;

112 return 0;

113 }

114

115 static void deferred_init(void)

116 {

117 union ovrGLConfig glcfg;

118 unsigned int dcaps;

119 void *win = 0;

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

121

122 deferred_init_done = 1;

123

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

125 glcfg.OGL.Header.API = ovrRenderAPI_OpenGL;

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

127 glcfg.OGL.Header.Multisample = 1;

128 #ifdef WIN32

129 win = GetActiveWindow();

130 glcfg.OGL.Window = win;

131 glcfg.OGL.DC = wglGetCurrentDC();

132 #else

133 glcfg.OGL.Disp = glXGetCurrentDisplay();

134 win = (void*)glXGetCurrentDrawable();

135

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

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

138 */

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

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

141 #endif

142

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

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

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

146 } else {

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

148 }

149 ovrHmd_SetEnabledCaps(hmd, ovrHmdCap_LowPersistence | ovrHmdCap_DynamicPrediction);

150

151 dcaps = ovrDistortionCap_TimeWarp | ovrDistortionCap_Overdrive;

152 #ifdef OVR_OS_LINUX

153 dcaps |= ovrDistortionCap_LinuxDevFullscreen;

154 #endif

155

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

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

158 }

159

160 /* set the eye offset options */

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

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

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

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

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

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

167

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

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

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

171 set_option_vec(optdb, VR_LEYE_OFFSET, reye_offs);

172 set_option_vec(optdb, VR_REYE_OFFSET, leye_offs);

173 } else {

174 set_option_vec(optdb, VR_LEYE_OFFSET, leye_offs);

175 set_option_vec(optdb, VR_REYE_OFFSET, reye_offs);

176 }

177 }

178

179 static void cleanup(void)

180 {

181 if(hmd) {

182 ovrHmd_Destroy(hmd);

183 ovr_Shutdown();

184 }

185 destroy_options(optdb);

186 }

187

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

189 {

190 float fval;

191

192 switch(type) {

193 case OTYPE_INT:

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

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

196 break;

197

198 case OTYPE_FLOAT:

199 fval = *(float*)valp;

200 set_option_float(optdb, opt, fval);

201 break;

202

203 case OTYPE_VEC:

204 set_option_vec(optdb, opt, valp);

205 break;

206 }

207

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

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

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

211

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

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

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

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

216 }

217

218 return 0;

219 }

220

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

222 {

223 switch(type) {

224 case OTYPE_INT:

225 return get_option_int(optdb, opt, valp);

226 case OTYPE_FLOAT:

227 return get_option_float(optdb, opt, valp);

228 case OTYPE_VEC:

229 return get_option_vec(optdb, opt, valp);

230 }

231 return -1;

232 }

233

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

235 {

236 if(!hmd) {

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

238 return;

239 }

240

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

242 * reuse the one we got last frame.

243 */

244 if(inside_begin_end) {

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

246 }

247

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

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

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

251 }

252

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

254 {

255 if(!hmd) {

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

257 quat[3] = 1.0f;

258 return;

259 }

260

261 /* same as above (translation) */

262 if(inside_begin_end) {

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

264 }

265

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

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

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

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

270 }

271

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

273

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

275 {

276 int i, j;

277 ovrMatrix4f vmat;

278

279 if(!hmd) {

280 memcpy(mat, idmat, sizeof idmat);

281 return;

282 }

283

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

285

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

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

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

289 }

290 }

291 }

292

293 static void begin(int eye)

294 {

295 if(!hmd) return;

296

297 if(!deferred_init_done) {

298 deferred_init();

299 }

300

301 if(!inside_begin_end) {

302 ovrHmd_BeginFrame(hmd, 0);

303 inside_begin_end = 1;

304 }

305 }

306

307 static int present(void)

308 {

309 int cur_prog = 0;

310

311 if(!hmd) return 0;

312

313 if(gl_use_program) {

314 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_prog);

315 }

316

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

318 inside_begin_end = 0;

319

320 if(gl_use_program) {

321 gl_use_program(cur_prog);

322 }

323

324 return 1;

325 }

326

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

328 {

329 ovrSizei texsz;

330 ovrRecti rect;

331

332 glBindTexture(GL_TEXTURE_2D, tex);

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

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

335

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

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

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

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

340

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

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

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

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

345 }

346

347 static void recenter(void)

348 {

349 if(hmd) {

350 ovrHmd_RecenterPose(hmd);

351 }

352 }

353

354 struct vr_module *vr_module_libovr(void)

355 {

356 static struct vr_module m;

357

358 if(!m.init) {

359 m.name = "libovr";

360 m.init = init;

361 m.cleanup = cleanup;

362 m.set_option = set_option;

363 m.get_option = get_option;

364 m.translation = translation;

365 m.rotation = rotation;

366 m.proj_matrix = proj_matrix;

367 m.begin = begin;

368 m.present = present;

369 m.set_eye_texture = set_eye_texture;

370 m.recenter = recenter;

371 }

372 return &m;

373 }

374

375 #else /* no libovr */

376

377 static int init(void)

378 {

379 return -1;

380 }

381

382 struct vr_module *vr_module_libovr(void)

383 {

384 static struct vr_module m;

385

386 if(!m.init) {

387 m.name = "libovr";

388 m.init = init;

389 }

390 return &m;

391 }

392

393 #endif /* USE_LIBOVR */