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 / 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         unsigned int hand_mask = (ovrStatus_OrientationTracked | ovrStatus_PositionTracked);
 249         unsigned int hand_flags = (ovrStatus_OrientationTracked | ovrStatus_PositionTracked);
 250
 251         /* Get both eye poses simultaneously, with IPD offset already included. */
 252         double displayMidpointSeconds = ovr_GetPredictedDisplayTime(session, frameIndex);
 253         ovrTrackingState hmdState = ovr_GetTrackingState(session, displayMidpointSeconds, ovrTrue);
 254         ovr_CalcEyePoses(hmdState.HeadPose.ThePose, hmdToEyeViewPose, layer.RenderPose);
 255         /* Grab hand poses useful for rendering head/hand or controller representation */
 256         headPose = hmdState.HeadPose.ThePose;
 257         handPose = headPose;
 258 //      if ((hmdState.HandStatusFlags[ovrHand_Left] & hand_mask) == hand_flags)
 259 //              handPose = hmdState.HandPoses[ovrHand_Left].ThePose;
 260         if ((hmdState.HandStatusFlags[ovrHand_Right] & hand_mask) == hand_flags)
 261                 handPose = hmdState.HandPoses[ovrHand_Right].ThePose;
 262         x = handPose.Position.x;
 263         y = handPose.Position.y;
 264         z = handPose.Position.z;
 265         x += hand_x_reset;
 266         y += hand_y_reset;
 267         z += hand_z_reset;
 268         *hand_right_x = x / 0.0254;
 269         *hand_right_y = y / 0.0254;
 270         *hand_right_z = z / 0.0254;
 271         ovrOrientation2yawpitchroll(headPose.Orientation, &yaw, &pitch, &roll);
 272         *head_yaw = yaw;
 273         *head_pitch = pitch;
 274         *head_roll = roll;
 275         ovrOrientation2yawpitchroll(handPose.Orientation, &yaw, &pitch, &roll);
 276         *hand_right_yaw = yaw;
 277         *hand_right_pitch = pitch;
 278         *hand_right_roll = roll;
 279
 280         result = ovr_GetInputState(session, ovrControllerType_Active, &inputState);
 281         if (OVR_SUCCESS(result)) {
 282                 if (inputState.Buttons & ovrButton_A)
 283                         *button_a = 1;
 284                 else
 285                         *button_a = 0;
 286                 if (inputState.Buttons & ovrButton_B)
 287                         *button_b = 1;
 288                 else
 289                         *button_b = 0;
 290                 if (inputState.Buttons & ovrButton_X)
 291                         *button_x = 1;
 292                 else
 293                         *button_x = 0;
 294                 if (inputState.Buttons & ovrButton_Y)
 295                         *button_y = 1;
 296                 else
 297                         *button_y = 0;
 298                 if (inputState.Buttons & ovrButton_Enter)
 299                         *button_menu = 1;
 300                 else
 301                         *button_menu = 0;
 302                 if (inputState.Buttons & ovrButton_LThumb)
 303                         *button_left_thumb = 1;
 304                 else
 305                         *button_left_thumb = 0;
 306                 if (inputState.Buttons & ovrButton_RThumb)
 307                         *button_right_thumb = 1;
 308                 else
 309                         *button_right_thumb = 0;
 310                 if (inputState.IndexTrigger[ovrHand_Left] >= 0.8)
 311                         *button_left_trigger = 1;
 312                 else
 313                         *button_left_trigger = 0;
 314                 if (inputState.IndexTrigger[ovrHand_Right] >= 0.8)
 315                         *button_right_trigger = 1;
 316                 else
 317                         *button_right_trigger = 0;
 318                 *stick_left_x = inputState.ThumbstickNoDeadzone[ovrHand_Left].x;
 319                 *stick_left_y = inputState.ThumbstickNoDeadzone[ovrHand_Left].y;
 320                 *stick_right_x = inputState.ThumbstickNoDeadzone[ovrHand_Right].x;
 321                 *stick_right_y = inputState.ThumbstickNoDeadzone[ovrHand_Right].y;
 322         }
 323 }
 324
 325 void begin_render_ovr(void)
 326 {
 327         ovrResult result;
 328
 329         result = ovr_WaitToBeginFrame(session, frameIndex);
 330         if (!OVR_SUCCESS(result))
 331                 print_info("Failed to wait to begin frame (error %d)\n", result);
 332         result = ovr_BeginFrame(session, frameIndex);
 333         if (!OVR_SUCCESS(result))
 334                 print_info("Failed to begin frame (error %d)\n", result);
 335 }
 336
 337 static int initial_observer_reset = 1;
 338
 339 void begin_render_ovr_eye(int eye, double *camera_x, double *camera_y, double *camera_z)
 340 {
 341         int curIndex;
 342         GLuint chainTexId;
 343         float yaw, pitch, roll;
 344         double x, y, z;
 345
 346         /* set render surface */
 347         ovr_GetTextureSwapChainCurrentIndex(session, textureSwapChain[eye], &curIndex);
 348         ovr_GetTextureSwapChainBufferGL(session, textureSwapChain[eye], curIndex, &chainTexId);
 349         glBindFramebuffer(GL_FRAMEBUFFER, fboId[eye]);
 350         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, (multisampling > 1) ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D, chainTexId, 0);
 351
 352         glViewport(0, 0, TextureSize[eye].w, TextureSize[eye].h);
 353         glMatrixMode(GL_PROJECTION);
 354         glLoadIdentity();
 355         glFrustum(
 356                 -layer.Fov[eye].LeftTan,
 357                 layer.Fov[eye].RightTan,
 358                 layer.Fov[eye].UpTan,
 359                 -layer.Fov[eye].DownTan,
 360                 1.0, 5000000000.0);
 361
 362         ovrOrientation2yawpitchroll(layer.RenderPose[eye].Orientation, &yaw, &pitch, &roll);
 363         x = layer.RenderPose[eye].Position.x;
 364         y = layer.RenderPose[eye].Position.y;
 365         z = layer.RenderPose[eye].Position.z;
 366
 367         /* reset to game's observer, if requrested by user */
 368         observer_x = x;
 369         observer_y = y;
 370         observer_z = z;
 371         if (initial_observer_reset) {
 372                 initial_observer_reset = 0;
 373                 reset_observer_ovr();
 374         }
 375         x += observer_x_reset;
 376         y += observer_y_reset;
 377         z += observer_z_reset;
 378
 379         glRotatef(-roll / M_PI * 180.0,0,0,1);
 380         glRotatef(-pitch / M_PI * 180.0,1,0,0);
 381         glRotatef(-yaw / M_PI * 180.0,0,1,0);
 382
 383         *camera_x = x / 0.0254;
 384         *camera_y = y / 0.0254;
 385         *camera_z = z / 0.0254;
 386         glTranslated(-(*camera_x), -(*camera_y), -(*camera_z)); /* convert to inch */
 387
 388         glMatrixMode(GL_MODELVIEW);
 389
 390         /* DO NOT ENABLE, since our mercenary-textures are not SRGB */
 391         //glEnable(GL_FRAMEBUFFER_SRGB);
 392
 393 }
 394
 395 void end_render_ovr_eye(int eye)
 396 {
 397         // unset render surface
 398         glBindFramebuffer(GL_FRAMEBUFFER, fboId[eye]);
 399         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, (multisampling > 1) ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D, 0, 0);
 400         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, (multisampling > 1) ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D, 0, 0);
 401         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 402
 403         // Commit the changes to the texture swap chain
 404         ovr_CommitTextureSwapChain(session, textureSwapChain[eye]);
 405 }
 406
 407 void end_render_ovr(void)
 408 {
 409         ovrResult result;
 410
 411         const ovrLayerHeader *layers[] = { &layer.Header };
 412         result = ovr_EndFrame(session, frameIndex, NULL, layers, 1);
 413         if (!OVR_SUCCESS(result))
 414                 print_info("Failed to submit frame (error %d)\n", result);
 415         frameIndex++;
 416 }
 417
 418 void render_mirror_ovr(int view_width, int view_height)
 419 {
 420         int view_x = 0, view_y = 0;
 421         int new_width, new_height;
 422
 423         /* avoid division by zero, if one dimension is too small */
 424         if (view_width < 1 || view_height < 1)
 425                 return;
 426
 427         /* calculate a viewport that has apect of TextureSize */
 428         if (view_height * mirror_width > view_width * mirror_height) {
 429                 new_height = view_width * mirror_height / mirror_width;
 430                 view_y = view_y + view_height / 2 - new_height / 2;
 431                 view_height = new_height;
 432         } else if (view_height * mirror_width < view_width * mirror_height) {
 433                 new_width = view_height * mirror_width / mirror_height;
 434                 view_x = view_x + view_width / 2 - new_width / 2;
 435                 view_width = new_width;
 436         }
 437
 438         /* avoid views that are too small */
 439         if (view_width < 1 || view_height < 1)
 440                 return;
 441
 442         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 443
 444         glClearColor(0.0, 0.0, 0.0, 1.0);
 445         glClear(GL_COLOR_BUFFER_BIT);
 446
 447         /* Blit mirror texture to back buffer */
 448         glBindFramebuffer(GL_READ_FRAMEBUFFER, mirrorFBO);
 449         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 450         glBlitFramebuffer(0, mirror_height, mirror_width, 0,
 451                 view_x, view_y, view_x + view_width, view_y + view_height,
 452                 GL_COLOR_BUFFER_BIT, GL_NEAREST);
 453         glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
 454 }
 455
 456 void reset_observer_ovr(void)
 457 {
 458         observer_x_reset = -observer_x;
 459         observer_y_reset = -observer_y;
 460         observer_z_reset = -observer_z;
 461         hand_x_reset = -observer_x;
 462         hand_y_reset = -observer_y;
 463         hand_z_reset = -observer_z;
 464 }
 465
 466 void exit_ovr(void)
 467 {
 468         int eye;
 469
 470         /* destroy render buffers */
 471         for (eye = 0; eye < 2; eye++) {
 472                 if (textureSwapChain[eye]) {
 473                         ovr_DestroyTextureSwapChain(session, textureSwapChain[eye]);
 474                         textureSwapChain[eye] = NULL;
 475                 }
 476                 if (fboId[eye]) {
 477                         glDeleteFramebuffers(1, &fboId[eye]);
 478                         fboId[eye] = 0;
 479                 }
 480         }
 481         if (mirrorFBO) {
 482                 glDeleteFramebuffers(1, &mirrorFBO);
 483                 mirrorFBO = 0;
 484         }
 485
 486         if (session) {
 487                 ovr_Destroy(session);
 488                 session = NULL;
 489         }
 490         if (ovr_initialized) {
 491                 ovr_Shutdown();
 492                 ovr_initialized = 0;
 493         }
 494 }
 495