symmetry: a90a71a74f0b src/vr/vr.cc

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view src/vr/vr.cc @ 0:a90a71a74f0b

initial commit

author	John Tsiombikas <nuclear@member.fsf.org>
date	Tue, 25 Feb 2014 19:53:34 +0200
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line source

1 #include <stdio.h>

2 #include <GL/glew.h>

3 #include "vr.h"

4 #include "vr_impl.h"

5 #include "vr_sdr.h"

7 #ifndef WIN32

8 #include <alloca.h>

9 #else

10 #include <malloc.h>

11 #endif

13 static void init_ctx();

14 static bool init_ovr();

15 static bool init_sdr();

17 VRContext vr_ctx;

18 static unsigned int sdrprog;

20 extern "C" int vr_init(enum vr_init_mode mode)

21 {

22 init_ctx();

24 if(!init_ovr()) {

25 return -1;

26 }

28 if(!init_sdr()) {

29 return -1;

30 }

32 return 0;

33 }

35 extern "C" void vr_shutdown(void)

36 {

37 delete [] vr_ctx.info.display;

38 delete vr_ctx.ovr_sfusion;

39 //System::Destroy();

41 memset(&vr_ctx, 0, sizeof vr_ctx);

42 }

44 static void init_ctx()

45 {

46 vr_ctx.info.width = 1280;

47 vr_ctx.info.height = 800;

48 vr_ctx.info.fov = M_PI / 2.0;

49 vr_ctx.info.aspect = (float)vr_ctx.info.width / (float)vr_ctx.info.height;

50 vr_ctx.info.ipd = 0.035;

51 vr_ctx.info.scale = 1.0;

52 }

54 static bool init_ovr()

55 {

56 LogMaskConstants log_level = LogMask_All;

57 // initialize Oculus SDK

58 const char *logenv = getenv("VR_LOGLEVEL");

59 if(logenv) {

60 switch(atoi(logenv)) {

61 case 0:

62 log_level = LogMask_None;

63 break;

64 case 1:

65 log_level = LogMask_Regular;

66 break;

67 case 2:

68 default:

69 log_level = LogMask_All;

70 break;

71 }

72 }

74 System::Init(Log::ConfigureDefaultLog(log_level));

75 if(!(vr_ctx.ovr_devman = DeviceManager::Create())) {

76 fprintf(stderr, "failed to create OVR device manager\n");

77 return false;

78 }

80 // create the display device

81 HMDInfo info;

82 if(!(vr_ctx.ovr_hmd_dev = vr_ctx.ovr_devman->EnumerateDevices<HMDDevice>().CreateDevice())) {

83 fprintf(stderr, "no oculus rift devices found\n");

84 } else {

85 if(vr_ctx.ovr_hmd_dev->GetDeviceInfo(&info)) {

86 printf("oculus device info:\n");

87 printf(" name: %s\n", info.DisplayDeviceName);

88 printf(" ipd: %f\n", info.InterpupillaryDistance);

89 printf(" distortion: %f %f %f %f\n", info.DistortionK[0],

90 info.DistortionK[1], info.DistortionK[2], info.DistortionK[3]);

91 }

93 // calculate and store viewing parameters

94 vr_ctx.info.width = info.HResolution;

95 vr_ctx.info.height = info.VResolution;

96 vr_ctx.info.aspect = (float)vr_ctx.info.width / (float)vr_ctx.info.height;

98 vr_ctx.info.ipd = info.InterpupillaryDistance;

99 for(int i=0; i<4; i++) {

100 vr_ctx.info.distort[i] = info.DistortionK[i];

101 }

102

103 Util::Render::StereoConfig stereohelp;

104 stereohelp.SetFullViewport(Util::Render::Viewport(0, 0, vr_ctx.info.width, vr_ctx.info.height));

105 stereohelp.SetStereoMode(Util::Render::Stereo_LeftRight_Multipass);

106 stereohelp.SetHMDInfo(info);

107 stereohelp.SetDistortionFitPointVP(-1.0, 0.0);

108

109 vr_ctx.info.scale = stereohelp.GetDistortionScale();

110

111 float vhalfsz = vr_ctx.info.scale * info.VScreenSize * 0.5;

112 vr_ctx.info.fov = 2.0 * atan(vhalfsz / info.EyeToScreenDistance);

113

114 vr_ctx.info.lens_center_offset = 0.5 - info.LensSeparationDistance / info.HScreenSize;

115

116 // calculate center of projection shift to match the lens positions

117 float center_dist_meters = info.HScreenSize * 0.25;

118 float proj_shift = center_dist_meters - info.LensSeparationDistance * 0.5;

119 vr_ctx.info.proj_center_offset = 4.0 * proj_shift / info.HScreenSize;

120

121 // grab the display info

122 vr_ctx.info.display = new char[strlen(info.DisplayDeviceName) + 1];

123 strcpy(vr_ctx.info.display, info.DisplayDeviceName);

124

125 vr_ctx.info.display_xoffs = info.DesktopX;

126 vr_ctx.info.display_yoffs = info.DesktopY;

127

128 printf("display: \"%s\" offset: %+d %+d\n", vr_ctx.info.display,

129 vr_ctx.info.display_xoffs, vr_ctx.info.display_yoffs);

130 }

131

132 // get the sensor device

133 if(vr_ctx.ovr_hmd_dev) {

134 if(!(vr_ctx.ovr_sensor_dev = vr_ctx.ovr_hmd_dev->GetSensor())) {

135 fprintf(stderr, "failed to get oculus sensor device\n");

136 }

137 } else {

138 if(!(vr_ctx.ovr_sensor_dev = vr_ctx.ovr_devman->EnumerateDevices<SensorDevice>().CreateDevice())) {

139 fprintf(stderr, "failed to get oculus sensor device\n");

140 }

141 }

142

143 if(vr_ctx.ovr_sensor_dev) {

144 SensorInfo sinfo;

145 if(vr_ctx.ovr_sensor_dev->GetDeviceInfo(&sinfo)) {

146 printf("oculus sensor device info:\n");

147 printf(" name: %s\n", sinfo.ProductName);

148 }

149

150 vr_ctx.ovr_sfusion = new SensorFusion;

151 vr_ctx.ovr_sfusion->AttachToSensor(vr_ctx.ovr_sensor_dev);

152 }

153 return true;

154 }

155

156 #undef EXTERNAL_SHADER

157

158 static bool init_sdr()

159 {

160 int status;

161

162 #ifdef EXTERNAL_SHADER

163 FILE *fp = fopen("sdr/sdr.glsl", "rb");

164 if(!fp) {

165 perror("failed to load sdr.glsl");

166 return false;

167 }

168 fseek(fp, 0, SEEK_END);

169 long sz = ftell(fp);

170 rewind(fp);

171

172 char *buf = (char*)alloca(sz + 1);

173 fread(buf, 1, sz, fp);

174 buf[sz] = 0;

175 sdr_src = buf;

176

177 fclose(fp);

178 #endif

179

180 unsigned int sdr = glCreateShader(GL_FRAGMENT_SHADER);

181 glShaderSource(sdr, 1, &sdr_src, 0);

182 glCompileShader(sdr);

183 glGetShaderiv(sdr, GL_COMPILE_STATUS, &status);

184 if(!status) {

185 fprintf(stderr, "failed to compile distortion shader\n");

186

187 int loglen;

188 glGetShaderiv(sdr, GL_INFO_LOG_LENGTH, &loglen);

189

190 if(loglen > 0) {

191 char *log = (char*)alloca(loglen);

192 glGetShaderInfoLog(sdr, loglen, &loglen, log);

193 fprintf(stderr, "%s\n", log);

194 }

195

196 return false;

197 }

198

199 sdrprog = glCreateProgram();

200 glAttachShader(sdrprog, sdr);

201 glLinkProgram(sdrprog);

202 if(!status) {

203 fprintf(stderr, "failed to link distortion shader program\n");

204 glDeleteShader(sdr);

205 return false;

206 }

207

208 int loc;

209

210 glUseProgram(sdrprog);

211

212 if((loc = glGetUniformLocation(sdrprog, "tex")) != -1) {

213 glUniform1i(loc, 0);

214 }

215 if((loc = glGetUniformLocation(sdrprog, "lens_center_offset")) != -1) {

216 glUniform1f(loc, 0);

217 }

218 if((loc = glGetUniformLocation(sdrprog, "scr_center")) != -1) {

219 glUniform2f(loc, 0, 0);

220 }

221 if((loc = glGetUniformLocation(sdrprog, "scale")) != -1) {

222 glUniform1f(loc, vr_ctx.info.scale);

223 }

224 if((loc = glGetUniformLocation(sdrprog, "aspect")) != -1) {

225 printf("setting aspect: %f\n", vr_ctx.info.aspect / 2.0);

226 glUniform1f(loc, vr_ctx.info.aspect / 2.0);

227 }

228 if((loc = glGetUniformLocation(sdrprog, "scale_in")) != -1) {

229 glUniform2f(loc, 1, 1);

230 }

231 if((loc = glGetUniformLocation(sdrprog, "dist_factors")) != -1) {

232 glUniform4f(loc, vr_ctx.info.distort[0], vr_ctx.info.distort[1],

233 vr_ctx.info.distort[2], vr_ctx.info.distort[3]);

234 }

235

236 return true;

237 }

238

239 extern "C" const char *vr_get_display_name(void)

240 {

241 return vr_ctx.info.display;

242 }

243

244 extern "C" void vr_get_display_pos(int *xptr, int *yptr)

245 {

246 *xptr = vr_ctx.info.display_xoffs;

247 *yptr = vr_ctx.info.display_yoffs;

248 }

249

250 extern "C" int vr_get_width(void)

251 {

252 return vr_ctx.info.width;

253 }

254

255 extern "C" int vr_get_height(void)

256 {

257 return vr_ctx.info.height;

258 }

259

260 extern "C" float vr_get_fov(void)

261 {

262 return vr_ctx.info.fov;

263 }

264

265 extern "C" float vr_get_aspect(void)

266 {

267 return vr_ctx.info.aspect;

268 }

269

270 extern "C" void vr_set_eyedist(float ipd)

271 {

272 vr_ctx.info.ipd = ipd;

273 }

274

275 extern "C" float vr_get_eyedist(void)

276 {

277 return vr_ctx.info.ipd;

278 }

279

280 extern "C" void vr_set_distort(const float *coef)

281 {

282 memcpy(vr_ctx.info.distort, coef, sizeof vr_ctx.info.distort);

283 }

284

285 extern "C" void vr_get_distort(float *coef)

286 {

287 memcpy(coef, vr_ctx.info.distort, sizeof vr_ctx.info.distort);

288 }

289

290 extern "C" void vr_set_prediction_sec(float dt)

291 {

292 vr_ctx.ovr_sfusion->SetPrediction(dt);

293 }

294

295 extern "C" float vr_get_prediction_sec(void)

296 {

297 return vr_ctx.ovr_sfusion->GetPredictionDelta();

298 }

299

300 extern "C" void vr_get_view_matrix(float *res, int eye)

301 {

302 // TODO

303 }

304

305 extern "C" void vr_get_proj_matrix(float *res, int eye)

306 {

307 static float eye_scale[] = {0.0, 1.0, -1.0};

308

309 Matrix4f proj = Matrix4f::PerspectiveRH(vr_ctx.info.fov, vr_ctx.info.aspect / 2.0, 0.3, 1000.0);

310 proj = Matrix4f::Translation(vr_ctx.info.proj_center_offset * eye_scale[eye], 0, 0) * proj;

311

312 memcpy(res, proj.M[0], 16 * sizeof(float));

313 }

314

315 extern "C" void vr_get_translation(float *offs)

316 {

317 // current oculus devkit doesn't do translation

318 offs[0] = offs[1] = offs[2] = 0.0f;

319 }

320

321 extern "C" void vr_get_rotation(float *quat)

322 {

323 Quatf oq = vr_ctx.ovr_sfusion->GetPredictedOrientation();

324 quat[0] = oq.x;

325 quat[1] = oq.y;

326 quat[2] = oq.z;

327 quat[3] = oq.w;

328 }

329

330 extern "C" void vr_get_rotation_euler(float *euler)

331 {

332 Quatf oq = vr_ctx.ovr_sfusion->GetPredictedOrientation();

333 oq.GetEulerAngles<Axis_Y, Axis_X, Axis_Z>(euler + 1, euler, euler + 2);

334 }

335

336 extern "C" void vr_draw_eye(int eye, unsigned int tex, float tex_scale_x, float tex_scale_y)

337 {

338 static const float rects[3][4] = {

339 {-1, -1, 1, 1},

340 {-1, -1, 0, 1},

341 {0, -1, 1, 1}

342 };

343 static const float offs_scale[3] = {0.0, -1.0, 1.0};

344

345 glPushAttrib(GL_ENABLE_BIT);

346 glDisable(GL_DEPTH_TEST);

347 glDisable(GL_LIGHTING);

348 glEnable(GL_TEXTURE_2D);

349

350 glMatrixMode(GL_MODELVIEW);

351 glPushMatrix();

352 glLoadIdentity();

353

354 glMatrixMode(GL_PROJECTION);

355 glPushMatrix();

356 glLoadIdentity();

357

358 glUseProgram(sdrprog);

359

360 if(sdrprog) {

361 int loc;

362 if((loc = glGetUniformLocation(sdrprog, "lens_center_offset")) != -1) {

363 float offset = vr_ctx.info.lens_center_offset * offs_scale[eye];

364 glUniform1f(loc, offset);

365 }

366

367 if((loc = glGetUniformLocation(sdrprog, "tex_scale")) != -1) {

368 glUniform2f(loc, tex_scale_x, tex_scale_y);

369 }

370 }

371

372 glBindTexture(GL_TEXTURE_2D, tex);

373 glBegin(GL_QUADS);

374 glColor4f(1, 1, 1, 1);

375 glTexCoord2f(0, 0); glVertex2f(rects[eye][0], rects[eye][1]);

376 glTexCoord2f(1, 0); glVertex2f(rects[eye][2], rects[eye][1]);

377 glTexCoord2f(1, 1); glVertex2f(rects[eye][2], rects[eye][3]);

378 glTexCoord2f(0, 1); glVertex2f(rects[eye][0], rects[eye][3]);

379 glEnd();

380

381 glUseProgram(0);

382

383 glPopMatrix();

384 glMatrixMode(GL_MODELVIEW);

385 glPopMatrix();

386

387 glPopAttrib();

388 }