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 handPoses[2];
 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 / 2;
 213         desc.Format = OVR_FORMAT_R8G8B8A8_UNORM_SRGB;
 214         desc.MirrorOptions =
 215                 ovrMirrorOption_PostDistortion |
 216                 ovrMirrorOption_IncludeGuardian |
 217                 ovrMirrorOption_IncludeNotifications |
 218                 ovrMirrorOption_IncludeSystemGui;
 219
 220         /* Create mirror texture and an FBO used to copy mirror texture to back buffer */
 221         result = ovr_CreateMirrorTextureWithOptionsGL(session, &desc, &mirrorTexture);
 222         if (!OVR_SUCCESS(result)) {
 223                 print_error("ovr_CreateMirrorTextureWithOptionsGL() failed! (error %d)\n", result);
 224                 goto error;
 225         }
 226
 227         /* Configure the mirror read buffer */
 228         GLuint texId;
 229         ovr_GetMirrorTextureBufferGL(session, mirrorTexture, &texId);
 230
 231         glGenFramebuffers(1, &mirrorFBO);
 232         glBindFramebuffer(GL_READ_FRAMEBUFFER, mirrorFBO);
 233         glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texId, 0);
 234         glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, 0);
 235
 236         return 0;
 237
 238 error:
 239         exit_ovr();
 240         return -EINVAL;
 241 }
 242
 243 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)
 244 {
 245         ovrResult result;
 246         float yaw, pitch, roll;
 247         double x, y, z;
 248
 249         /* Get both eye poses simultaneously, with IPD offset already included. */
 250         double displayMidpointSeconds = ovr_GetPredictedDisplayTime(session, frameIndex);
 251         ovrTrackingState hmdState = ovr_GetTrackingState(session, displayMidpointSeconds, ovrTrue);
 252         ovr_CalcEyePoses(hmdState.HeadPose.ThePose, hmdToEyeViewPose, layer.RenderPose);
 253         /* Grab hand poses useful for rendering head/hand or controller representation */
 254         headPose = hmdState.HeadPose.ThePose;
 255         if (hmdState.HandStatusFlags[ovrHand_Left] == (ovrStatus_OrientationTracked | ovrStatus_PositionTracked))
 256                 handPoses[ovrHand_Left]  = hmdState.HandPoses[ovrHand_Left].ThePose;
 257         else
 258                 handPoses[ovrHand_Left] = headPose;
 259         if (hmdState.HandStatusFlags[ovrHand_Right] == (ovrStatus_OrientationTracked | ovrStatus_PositionTracked))
 260                 handPoses[ovrHand_Right] = hmdState.HandPoses[ovrHand_Right].ThePose;
 261         else
 262                 handPoses[ovrHand_Right] = headPose;
 263         x = handPoses[ovrHand_Right].Position.x;
 264         y = handPoses[ovrHand_Right].Position.y;
 265         z = handPoses[ovrHand_Right].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(handPoses[ovrHand_Right].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 void begin_render_ovr_eye(int eye, double *camera_x, double *camera_y, double *camera_z)
 339 {
 340         int curIndex;
 341         GLuint chainTexId;
 342         float yaw, pitch, roll;
 343         double x, y, z;
 344
 345         /* set render surface */
 346         ovr_GetTextureSwapChainCurrentIndex(session, textureSwapChain[eye], &curIndex);
 347         ovr_GetTextureSwapChainBufferGL(session, textureSwapChain[eye], curIndex, &chainTexId);
 348         glBindFramebuffer(GL_FRAMEBUFFER, fboId[eye]);
 349         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, (multisampling > 1) ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D, chainTexId, 0);
 350
 351         glViewport(0, 0, TextureSize[eye].w, TextureSize[eye].h);
 352         glMatrixMode(GL_PROJECTION);
 353         glLoadIdentity();
 354         glFrustum(
 355                 -layer.Fov[eye].LeftTan,
 356                 layer.Fov[eye].RightTan,
 357                 layer.Fov[eye].UpTan,
 358                 -layer.Fov[eye].DownTan,
 359                 1.0, 5000000000.0);
 360
 361         ovrOrientation2yawpitchroll(layer.RenderPose[eye].Orientation, &yaw, &pitch, &roll);
 362         x = layer.RenderPose[eye].Position.x;
 363         y = layer.RenderPose[eye].Position.y;
 364         z = layer.RenderPose[eye].Position.z;
 365
 366         /* reset to game's observer, if requrested by user */
 367         observer_x = x;
 368         x += observer_x_reset;
 369         observer_y = y;
 370         y += observer_y_reset;
 371         observer_z = z;
 372         z += observer_z_reset;
 373
 374         glRotatef(-roll / M_PI * 180.0,0,0,1);
 375         glRotatef(-pitch / M_PI * 180.0,1,0,0);
 376         glRotatef(-yaw / M_PI * 180.0,0,1,0);
 377
 378         *camera_x = x / 0.0254;
 379         *camera_y = y / 0.0254;
 380         *camera_z = z / 0.0254;
 381         glTranslated(-(*camera_x), -(*camera_y), -(*camera_z)); /* convert to inch */
 382
 383         glMatrixMode(GL_MODELVIEW);
 384
 385         /* DO NOT ENABLE, since our mercenary-textures are not SRGB */
 386         //glEnable(GL_FRAMEBUFFER_SRGB);
 387
 388 }
 389
 390 void end_render_ovr_eye(int eye)
 391 {
 392         // unset render surface
 393         glBindFramebuffer(GL_FRAMEBUFFER, fboId[eye]);
 394         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, (multisampling > 1) ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D, 0, 0);
 395         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, (multisampling > 1) ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D, 0, 0);
 396         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 397
 398         // Commit the changes to the texture swap chain
 399         ovr_CommitTextureSwapChain(session, textureSwapChain[eye]);
 400 }
 401
 402 void end_render_ovr(void)
 403 {
 404         ovrResult result;
 405
 406         const ovrLayerHeader *layers[] = { &layer.Header };
 407         result = ovr_EndFrame(session, frameIndex, NULL, layers, 1);
 408         if (!OVR_SUCCESS(result))
 409                 print_info("Failed to submit frame (error %d)\n", result);
 410         frameIndex++;
 411 }
 412
 413 void render_mirror_ovr(int view_width, int view_height)
 414 {
 415         int view_x = 0, view_y = 0;
 416         int new_width, new_height;
 417
 418         /* avoid division by zero, if one dimension is too small */
 419         if (view_width < 1 || view_height < 1)
 420                 return;
 421
 422         /* calculate a viewport that has apect of TextureSize */
 423         if (view_height * mirror_width > view_width * mirror_height) {
 424                 new_height = view_width * mirror_height / mirror_width;
 425                 view_y = view_y + view_height / 2 - new_height / 2;
 426                 view_height = new_height;
 427         } else if (view_height * mirror_width < view_width * mirror_height) {
 428                 new_width = view_height * mirror_width / mirror_height;
 429                 view_x = view_x + view_width / 2 - new_width / 2;
 430                 view_width = new_width;
 431         }
 432
 433         /* avoid views that are too small */
 434         if (view_width < 1 || view_height < 1)
 435                 return;
 436
 437         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 438
 439         glClearColor(0.0, 0.0, 0.0, 1.0);
 440         glClear(GL_COLOR_BUFFER_BIT);
 441
 442         /* Blit mirror texture to back buffer */
 443         glBindFramebuffer(GL_READ_FRAMEBUFFER, mirrorFBO);
 444         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 445         glBlitFramebuffer(0, mirror_height, mirror_width, 0,
 446                 view_x, view_y, view_x + view_width, view_y + view_height,
 447                 GL_COLOR_BUFFER_BIT, GL_NEAREST);
 448         glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
 449 }
 450
 451 void reset_observer_ovr(void)
 452 {
 453         observer_x_reset = -observer_x;
 454         observer_y_reset = -observer_y;
 455         observer_z_reset = -observer_z;
 456         hand_x_reset = -observer_x;
 457         hand_y_reset = -observer_y;
 458         hand_z_reset = -observer_z;
 459 }
 460
 461 void exit_ovr(void)
 462 {
 463         int eye;
 464
 465         /* destroy render buffers */
 466         for (eye = 0; eye < 2; eye++) {
 467                 if (textureSwapChain[eye]) {
 468                         ovr_DestroyTextureSwapChain(session, textureSwapChain[eye]);
 469                         textureSwapChain[eye] = NULL;
 470                 }
 471                 if (fboId[eye]) {
 472                         glDeleteFramebuffers(1, &fboId[eye]);
 473                         fboId[eye] = 0;
 474                 }
 475         }
 476         if (mirrorFBO) {
 477                 glDeleteFramebuffers(1, &mirrorFBO);
 478                 mirrorFBO = 0;
 479         }
 480
 481         if (session) {
 482                 ovr_Destroy(session);
 483                 session = NULL;
 484         }
 485         if (ovr_initialized) {
 486                 ovr_Shutdown();
 487                 ovr_initialized = 0;
 488         }
 489 }
 490