src/libovr/ovr.c

   1 /* OVR handling
   2  *
   3  * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
   4  * All Rights Reserved
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  * Based on example code:
  20  * Filename    :   main.cpp
  21  * Content     :   Simple minimal VR demo
  22  * Created     :   December 1, 2014
  23  * Author      :   Tom Heath
  24  * Copyright   :   Copyright 2012 Oculus, Inc. All Rights reserved.
  25  *
  26  * Licensed under the Apache License, Version 2.0 (the "License");
  27  * you may not use this file except in compliance with the License.
  28  * You may obtain a copy of the License at
  29  *
  30  * http://www.apache.org/licenses/LICENSE-2.0
  31  *
  32  * Unless required by applicable law or agreed to in writing, software
  33  * distributed under the License is distributed on an "AS IS" BASIS,
  34  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  35  * See the License for the specific language governing permissions and
  36  * limitations under the License.
  37  */
  38
  39 #include <stdio.h>
  40 #include <stdint.h>
  41 #include <string.h>
  42 #include <math.h>
  43 #include <errno.h>
  44 #include "../libsdl/print.h"
  45 #include "ovr.h"
  46
  47 #include <OVR_CAPI.h>
  48 #include <OVR_CAPI_GL.h>
  49 #include "helper.h"
  50
  51 #define GL3_PROTOTYPES 1
  52 #include <GL/glew.h>
  53
  54 #if 0
  55 #if defined(_WIN32)
  56     #include <dxgi.h> // for GetDefaultAdapterLuid
  57     #pragma comment(lib, "dxgi.lib")
  58 #endif
  59
  60 static ovrGraphicsLuid GetDefaultAdapterLuid()
  61 {
  62         ovrGraphicsLuid luid = ovrGraphicsLuid();
  63
  64 #if defined(_WIN32)
  65         IDXGIFactory* factory = nullptr;
  66
  67         if (SUCCEEDED(CreateDXGIFactory(IID_PPV_ARGS(&factory)))) {
  68                 IDXGIAdapter* adapter = nullptr;
  69
  70                 if (SUCCEEDED(factory->EnumAdapters(0, &adapter))) {
  71                         DXGI_ADAPTER_DESC desc;
  72
  73                         adapter->GetDesc(&desc);
  74                         memcpy(&luid, &desc.AdapterLuid, sizeof(luid));
  75                         adapter->Release();
  76                 }
  77
  78                 factory->Release();
  79         }
  80 #endif
  81
  82         return luid;
  83 }
  84
  85 static int Compare(const ovrGraphicsLuid lhs, const ovrGraphicsLuid rhs)
  86 {
  87     return memcmp(&lhs, &rhs, sizeof(ovrGraphicsLuid));
  88 }
  89 #endif
  90
  91 static int ovr_initialized = 0;
  92 static ovrSession session = NULL;
  93 static ovrGraphicsLuid luid;
  94 static ovrHmdDesc hmdDesc;
  95 static ovrSizei TextureSize[2];
  96 static ovrTextureSwapChain textureSwapChain[2] = { NULL, NULL };
  97 static GLuint fboId[2] = { 0, 0 };
  98 static GLuint mirrorFBO = 0;
  99 static int mirror_width;
 100 static int mirror_height;
 101 static ovrEyeRenderDesc eyeRenderDesc[2];
 102 static ovrPosef hmdToEyeViewPose[2];
 103 static ovrPosef headPose;
 104 static ovrPosef handPose;
 105 static ovrInputState inputState;
 106 static ovrLayerEyeFov layer;
 107 static int multisampling;
 108 static long long frameIndex = 0;
 109 static double observer_x = 0.0;
 110 static double observer_x_reset = 0.0;
 111 static double hand_x_reset = 0.0;
 112 static double observer_y = 0.0;
 113 static double observer_y_reset = 0.0;
 114 static double hand_y_reset = 0.0;
 115 static double observer_z = 0.0;
 116 static double observer_z_reset = 0.0;
 117 static double hand_z_reset = 0.0;
 118
 119 int init_ovr(int _multisampling)
 120 {
 121         ovrResult result;
 122         int eye;
 123
 124         multisampling = _multisampling;
 125
 126         glewExperimental = GL_TRUE;
 127         if (glewInit() != GLEW_OK) {
 128                 print_error("Failed to init GLEW\n");
 129                 goto error;
 130         }
 131
 132         result = ovr_Initialize(NULL);
 133         if (OVR_FAILURE(result)) {
 134                 print_error("Failed to init OVR (is Oculus Rift service running?)\n");
 135                 goto error;
 136         }
 137         ovr_initialized = 1;
 138
 139         result = ovr_Create(&session, &luid);
 140         if (OVR_FAILURE(result)) {
 141                 print_error("Failed to create OVR session (is the HMD connected?)\n");
 142                 goto error;
 143         }
 144
 145 #if 0
 146         if (Compare(luid, GetDefaultAdapterLuid())) { // If luid that the Rift is on is not the default adapter LUID...
 147                 print_error("OpenGL supports only the default graphics adapter.\n");
 148                 goto error;
 149         }
 150 #endif
 151
 152         hmdDesc = ovr_GetHmdDesc(session);
 153
 154         memset(&layer, 0, sizeof(layer));
 155         layer.Header.Type      = ovrLayerType_EyeFov;
 156         layer.Header.Flags     = 0;
 157
 158         /* do we need this??? seems to work without */
 159         if (multisampling > 1)
 160                 glEnable(GL_MULTISAMPLE);
 161
 162         /* create render buffers */
 163         for (eye = 0; eye < 2; eye++) {
 164                 TextureSize[eye] = ovr_GetFovTextureSize(session, (eye == 0) ? ovrEye_Left : ovrEye_Right, hmdDesc.DefaultEyeFov[eye], 1.0);
 165                 ovrTextureSwapChainDesc desc;
 166                 int length, i;
 167                 GLuint chainTexId;
 168
 169                 memset(&desc, 0, sizeof(desc));
 170                 desc.Type = ovrTexture_2D;
 171                 desc.ArraySize = 1;
 172                 desc.Format = OVR_FORMAT_R8G8B8A8_UNORM_SRGB;
 173                 desc.Width = TextureSize[eye].w;
 174                 desc.Height = TextureSize[eye].h;
 175                 desc.MipLevels = 1;
 176                 desc.SampleCount = (multisampling > 1) ? multisampling : 1;
 177                 desc.StaticImage = ovrFalse;
 178
 179                 result = ovr_CreateTextureSwapChainGL(session, &desc, &textureSwapChain[eye]);
 180                 if (OVR_FAILURE(result)) {
 181                         print_error("ovr_CreateTextureSwapChainGL() failed! (error %d)\n", result);
 182                         goto error;
 183                 }
 184
 185                 ovr_GetTextureSwapChainLength(session, textureSwapChain[eye], &length);
 186                 for (i = 0; i < length; i++) {
 187                         ovr_GetTextureSwapChainBufferGL(session, textureSwapChain[eye], i, &chainTexId);
 188                         glBindTexture((multisampling > 1) ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D, chainTexId);
 189                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 190                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 191                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 192                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 193                 }
 194
 195                 glGenFramebuffers(1, &(fboId[eye]));
 196
 197                 eyeRenderDesc[eye] = ovr_GetRenderDesc(session, (eye == 0) ? ovrEye_Left : ovrEye_Right, hmdDesc.DefaultEyeFov[eye]);
 198                 hmdToEyeViewPose[eye] = eyeRenderDesc[eye].HmdToEyePose;
 199
 200                 layer.ColorTexture[eye]  = textureSwapChain[eye];
 201                 layer.Fov[eye]           = eyeRenderDesc[eye].Fov;
 202                 layer.Viewport[eye].Pos.x = 0;
 203                 layer.Viewport[eye].Pos.y = 0;
 204                 layer.Viewport[eye].Size.w = TextureSize[eye].w;
 205                 layer.Viewport[eye].Size.h = TextureSize[eye].h;
 206         }
 207
 208         ovrMirrorTexture mirrorTexture = NULL;
 209         ovrMirrorTextureDesc desc;
 210         memset(&desc, 0, sizeof(desc));
 211         desc.Width = mirror_width = TextureSize[0].w;
 212         desc.Height = mirror_height = TextureSize[0].h;
 213         desc.Format = OVR_FORMAT_R8G8B8A8_UNORM_SRGB;
 214         desc.MirrorOptions =
 215 //              ovrMirrorOption_PostDistortion |
 216                 ovrMirrorOption_LeftEyeOnly |
 217                 ovrMirrorOption_IncludeGuardian |
 218                 ovrMirrorOption_IncludeNotifications |
 219                 ovrMirrorOption_IncludeSystemGui;
 220
 221         /* Create mirror texture and an FBO used to copy mirror texture to back buffer */
 222         result = ovr_CreateMirrorTextureWithOptionsGL(session, &desc, &mirrorTexture);
 223         if (!OVR_SUCCESS(result)) {
 224                 print_error("ovr_CreateMirrorTextureWithOptionsGL() failed! (error %d)\n", result);
 225                 goto error;
 226         }
 227
 228         /* Configure the mirror read buffer */
 229         GLuint texId;
 230         ovr_GetMirrorTextureBufferGL(session, mirrorTexture, &texId);
 231
 232         glGenFramebuffers(1, &mirrorFBO);
 233         glBindFramebuffer(GL_READ_FRAMEBUFFER, mirrorFBO);
 234         glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texId, 0);
 235         glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, 0);
 236
 237         return 0;
 238
 239 error:
 240         exit_ovr();
 241         return -EINVAL;
 242 }
 243
 244 void get_poses_ovr(int *button_a, int *button_b, int *button_x, int *button_y, int *button_menu, int *button_left_trigger, int *button_right_trigger, int *button_left_thumb, int *button_right_thumb, double *hand_right_x, double *hand_right_y, double *hand_right_z, double *hand_right_yaw, double *hand_right_pitch, double *hand_right_roll, double *stick_left_x, double *stick_left_y, double *stick_right_x, double *stick_right_y, double *head_yaw, double *head_pitch, double *head_roll)
 245 {
 246         ovrResult result;
 247         float yaw, pitch, roll;
 248         double x, y, z;
 249         unsigned int hand_mask = (ovrStatus_OrientationTracked | ovrStatus_PositionTracked);
 250         unsigned int hand_flags = (ovrStatus_OrientationTracked | ovrStatus_PositionTracked);
 251
 252         /* Get both eye poses simultaneously, with IPD offset already included. */
 253         double displayMidpointSeconds = ovr_GetPredictedDisplayTime(session, frameIndex);
 254         ovrTrackingState hmdState = ovr_GetTrackingState(session, displayMidpointSeconds, ovrTrue);
 255         ovr_CalcEyePoses(hmdState.HeadPose.ThePose, hmdToEyeViewPose, layer.RenderPose);
 256         /* Grab hand poses useful for rendering head/hand or controller representation */
 257         headPose = hmdState.HeadPose.ThePose;
 258         handPose = headPose;
 259 //      if ((hmdState.HandStatusFlags[ovrHand_Left] & hand_mask) == hand_flags)
 260 //              handPose = hmdState.HandPoses[ovrHand_Left].ThePose;
 261         if ((hmdState.HandStatusFlags[ovrHand_Right] & hand_mask) == hand_flags)
 262                 handPose = hmdState.HandPoses[ovrHand_Right].ThePose;
 263         x = handPose.Position.x;
 264         y = handPose.Position.y;
 265         z = handPose.Position.z;
 266         x += hand_x_reset;
 267         y += hand_y_reset;
 268         z += hand_z_reset;
 269         *hand_right_x = x / 0.0254;
 270         *hand_right_y = y / 0.0254;
 271         *hand_right_z = z / 0.0254;
 272         ovrOrientation2yawpitchroll(headPose.Orientation, &yaw, &pitch, &roll);
 273         *head_yaw = yaw;
 274         *head_pitch = pitch;
 275         *head_roll = roll;
 276         ovrOrientation2yawpitchroll(handPose.Orientation, &yaw, &pitch, &roll);
 277         *hand_right_yaw = yaw;
 278         *hand_right_pitch = pitch;
 279         *hand_right_roll = roll;
 280
 281         result = ovr_GetInputState(session, ovrControllerType_Active, &inputState);
 282         if (OVR_SUCCESS(result)) {
 283                 if (inputState.Buttons & ovrButton_A)
 284                         *button_a = 1;
 285                 else
 286                         *button_a = 0;
 287                 if (inputState.Buttons & ovrButton_B)
 288                         *button_b = 1;
 289                 else
 290                         *button_b = 0;
 291                 if (inputState.Buttons & ovrButton_X)
 292                         *button_x = 1;
 293                 else
 294                         *button_x = 0;
 295                 if (inputState.Buttons & ovrButton_Y)
 296                         *button_y = 1;
 297                 else
 298                         *button_y = 0;
 299                 if (inputState.Buttons & ovrButton_Enter)
 300                         *button_menu = 1;
 301                 else
 302                         *button_menu = 0;
 303                 if (inputState.Buttons & ovrButton_LThumb)
 304                         *button_left_thumb = 1;
 305                 else
 306                         *button_left_thumb = 0;
 307                 if (inputState.Buttons & ovrButton_RThumb)
 308                         *button_right_thumb = 1;
 309                 else
 310                         *button_right_thumb = 0;
 311                 if (inputState.IndexTrigger[ovrHand_Left] >= 0.8)
 312                         *button_left_trigger = 1;
 313                 else
 314                         *button_left_trigger = 0;
 315                 if (inputState.IndexTrigger[ovrHand_Right] >= 0.8)
 316                         *button_right_trigger = 1;
 317                 else
 318                         *button_right_trigger = 0;
 319                 *stick_left_x = inputState.ThumbstickNoDeadzone[ovrHand_Left].x;
 320                 *stick_left_y = inputState.ThumbstickNoDeadzone[ovrHand_Left].y;
 321                 *stick_right_x = inputState.ThumbstickNoDeadzone[ovrHand_Right].x;
 322                 *stick_right_y = inputState.ThumbstickNoDeadzone[ovrHand_Right].y;
 323         }
 324 }
 325
 326 void begin_render_ovr(void)
 327 {
 328         ovrResult result;
 329
 330         result = ovr_WaitToBeginFrame(session, frameIndex);
 331         if (!OVR_SUCCESS(result))
 332                 print_info("Failed to wait to begin frame (error %d)\n", result);
 333         result = ovr_BeginFrame(session, frameIndex);
 334         if (!OVR_SUCCESS(result))
 335                 print_info("Failed to begin frame (error %d)\n", result);
 336 }
 337
 338 static int initial_observer_reset = 1;
 339
 340 void begin_render_ovr_eye(int eye, double *camera_x, double *camera_y, double *camera_z)
 341 {
 342         int curIndex;
 343         GLuint chainTexId;
 344         float yaw, pitch, roll;
 345         double x, y, z;
 346
 347         /* set render surface */
 348         ovr_GetTextureSwapChainCurrentIndex(session, textureSwapChain[eye], &curIndex);
 349         ovr_GetTextureSwapChainBufferGL(session, textureSwapChain[eye], curIndex, &chainTexId);
 350         glBindFramebuffer(GL_FRAMEBUFFER, fboId[eye]);
 351         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, (multisampling > 1) ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D, chainTexId, 0);
 352
 353         glViewport(0, 0, TextureSize[eye].w, TextureSize[eye].h);
 354         glMatrixMode(GL_PROJECTION);
 355         glLoadIdentity();
 356         glFrustum(
 357                 -layer.Fov[eye].LeftTan,
 358                 layer.Fov[eye].RightTan,
 359                 layer.Fov[eye].UpTan,
 360                 -layer.Fov[eye].DownTan,
 361                 1.0, 5000000000.0);
 362
 363         ovrOrientation2yawpitchroll(layer.RenderPose[eye].Orientation, &yaw, &pitch, &roll);
 364         x = layer.RenderPose[eye].Position.x;
 365         y = layer.RenderPose[eye].Position.y;
 366         z = layer.RenderPose[eye].Position.z;
 367
 368         /* reset to game's observer, if requrested by user */
 369         observer_x = x;
 370         observer_y = y;
 371         observer_z = z;
 372         if (initial_observer_reset) {
 373                 initial_observer_reset = 0;
 374                 reset_observer_ovr();
 375         }
 376         x += observer_x_reset;
 377         y += observer_y_reset;
 378         z += observer_z_reset;
 379
 380         glRotatef(-roll / M_PI * 180.0,0,0,1);
 381         glRotatef(-pitch / M_PI * 180.0,1,0,0);
 382         glRotatef(-yaw / M_PI * 180.0,0,1,0);
 383
 384         *camera_x = x / 0.0254;
 385         *camera_y = y / 0.0254;
 386         *camera_z = z / 0.0254;
 387         glTranslated(-(*camera_x), -(*camera_y), -(*camera_z)); /* convert to inch */
 388
 389         glMatrixMode(GL_MODELVIEW);
 390
 391         /* DO NOT ENABLE, since our mercenary-textures are not SRGB */
 392         //glEnable(GL_FRAMEBUFFER_SRGB);
 393
 394 }
 395
 396 void end_render_ovr_eye(int eye)
 397 {
 398         // unset render surface
 399         glBindFramebuffer(GL_FRAMEBUFFER, fboId[eye]);
 400         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, (multisampling > 1) ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D, 0, 0);
 401         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, (multisampling > 1) ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D, 0, 0);
 402         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 403
 404         // Commit the changes to the texture swap chain
 405         ovr_CommitTextureSwapChain(session, textureSwapChain[eye]);
 406 }
 407
 408 void end_render_ovr(void)
 409 {
 410         ovrResult result;
 411
 412         const ovrLayerHeader *layers[] = { &layer.Header };
 413         result = ovr_EndFrame(session, frameIndex, NULL, layers, 1);
 414         if (!OVR_SUCCESS(result))
 415                 print_info("Failed to submit frame (error %d)\n", result);
 416         frameIndex++;
 417 }
 418
 419 void render_mirror_ovr(int view_width, int view_height)
 420 {
 421         int view_x = 0, view_y = 0;
 422         int new_height; //, new_width;
 423
 424         /* avoid division by zero, if one dimension is too small */
 425         if (view_width < 1 || view_height < 1)
 426                 return;
 427
 428         /* calculate a viewport that has apect of TextureSize */
 429 //      if (view_height * mirror_width > view_width * mirror_height) {
 430                 new_height = view_width * mirror_height / mirror_width;
 431                 view_y = view_y + view_height / 2 - new_height / 2;
 432                 view_height = new_height;
 433 //      } else if (view_height * mirror_width < view_width * mirror_height) {
 434 //              new_width = view_height * mirror_width / mirror_height;
 435 //              view_x = view_x + view_width / 2 - new_width / 2;
 436 //              view_width = new_width;
 437 //      }
 438
 439         /* avoid views that are too small */
 440         if (view_width < 1 || view_height < 1)
 441                 return;
 442
 443         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 444
 445         glClearColor(0.0, 0.0, 0.0, 1.0);
 446         glClear(GL_COLOR_BUFFER_BIT);
 447
 448         /* Blit mirror texture to back buffer */
 449         glBindFramebuffer(GL_READ_FRAMEBUFFER, mirrorFBO);
 450         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 451         glBlitFramebuffer(0, mirror_height, mirror_width, 0,
 452                 view_x, view_y, view_x + view_width, view_y + view_height,
 453                 GL_COLOR_BUFFER_BIT, GL_LINEAR);
 454         glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
 455 }
 456
 457 void reset_observer_ovr(void)
 458 {
 459         observer_x_reset = -observer_x;
 460         observer_y_reset = -observer_y;
 461         observer_z_reset = -observer_z;
 462         hand_x_reset = -observer_x;
 463         hand_y_reset = -observer_y;
 464         hand_z_reset = -observer_z;
 465 }
 466
 467 int should_quit_ovr(void)
 468 {
 469         ovrSessionStatus sessionStatus;
 470         ovrResult result;
 471
 472         result = ovr_GetSessionStatus(session, &sessionStatus);
 473
 474         if (OVR_SUCCESS(result))
 475                 return sessionStatus.ShouldQuit;
 476         return 0;
 477 }
 478
 479 void exit_ovr(void)
 480 {
 481         int eye;
 482
 483         /* destroy render buffers */
 484         for (eye = 0; eye < 2; eye++) {
 485                 if (textureSwapChain[eye]) {
 486                         ovr_DestroyTextureSwapChain(session, textureSwapChain[eye]);
 487                         textureSwapChain[eye] = NULL;
 488                 }
 489                 if (fboId[eye]) {
 490                         glDeleteFramebuffers(1, &fboId[eye]);
 491                         fboId[eye] = 0;
 492                 }
 493         }
 494         if (mirrorFBO) {
 495                 glDeleteFramebuffers(1, &mirrorFBO);
 496                 mirrorFBO = 0;
 497         }
 498
 499         if (session) {
 500                 ovr_Destroy(session);
 501                 session = NULL;
 502         }
 503         if (ovr_initialized) {
 504                 ovr_Shutdown();
 505                 ovr_initialized = 0;
 506         }
 507 }
 508