oculus2: 0984fa94b490 src/main.c

oculus2

view src/main.c @ 2:0984fa94b490

rendering almost works

author	John Tsiombikas <nuclear@member.fsf.org>
date	Tue, 26 Aug 2014 08:14:09 +0300
parents	0a4d62469381
children	096b18432ba7

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <assert.h>

4 #include <SDL2/SDL.h>

5 #include <GL/glew.h>

7 #ifdef WIN32

8 #define OVR_OS_WIN32

9 #endif

10 #ifdef __APPLE__

11 #define OVR_OS_MAC

12 #endif

14 #include <OVR_CAPI.h>

15 #include <OVR_CAPI_GL.h>

17 int init(void);

18 void cleanup(void);

19 void display(void);

20 void draw_scene(void);

21 void draw_box(float xsz, float ysz, float zsz, float norm_sign);

22 void update_rtarg(int width, int height);

23 int handle_event(SDL_Event *ev);

24 int key_event(int key, int state);

25 void reshape(int x, int y);

26 unsigned int next_pow2(unsigned int x);

28 OVR_EXPORT void ovrhmd_EnableHSWDisplaySDKRender(ovrHmd hmd, ovrBool enable);

30 static SDL_Window *win;

31 static SDL_GLContext ctx;

32 static int win_width, win_height;

34 static unsigned int fbo, fb_tex, fb_depth;

35 static int fb_width, fb_height;

36 static int fb_tex_width, fb_tex_height;

38 static ovrHmd hmd;

39 static ovrSizei eyeres[2];

40 static ovrEyeRenderDesc eye_rdesc[2];

41 static ovrGLTexture fb_ovr_tex[2];

44 int main(void)

45 {

46 if(init() == -1) {

47 return 1;

48 }

50 for(;;) {

51 SDL_Event ev;

53 while(SDL_PollEvent(&ev)) {

54 if(handle_event(&ev) == -1) {

55 goto done;

56 }

57 }

59 display();

60 }

62 done:

63 cleanup();

64 return 0;

65 }

68 int init(void)

69 {

70 int i, x, y;

71 unsigned int flags, dcaps;

72 union ovrGLConfig glcfg;

74 // this must be called before any OpenGL init according to the docs

75 ovr_Initialize();

77 SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER);

79 x = y = SDL_WINDOWPOS_UNDEFINED;

80 flags = SDL_WINDOW_OPENGL;

81 if(!(win = SDL_CreateWindow("simple oculus example", x, y, 1280, 800, flags))) {

82 fprintf(stderr, "failed to create window\n");

83 return -1;

84 }

85 if(!(ctx = SDL_GL_CreateContext(win))) {

86 fprintf(stderr, "failed to create OpenGL context\n");

87 return -1;

88 }

90 glewInit();

92 if(!(hmd = ovrHmd_Create(0))) {

93 fprintf(stderr, "failed to open Oculus HMD, falling back to virtual debug HMD\n");

94 if(!(hmd = ovrHmd_CreateDebug(ovrHmd_DK2))) {

95 fprintf(stderr, "failed to create virtual debug HMD\n");

96 return -1;

97 }

98 }

99 printf("initialized HMD: %s - %s\n", hmd->Manufacturer, hmd->ProductName);

100

101 SDL_SetWindowSize(win, hmd->Resolution.w, hmd->Resolution.h);

102

103 ovrHmd_ConfigureTracking(hmd, 0xffffffff, 0);

104 eyeres[0] = ovrHmd_GetFovTextureSize(hmd, ovrEye_Left, hmd->DefaultEyeFov[0], 1.0);

105 eyeres[1] = ovrHmd_GetFovTextureSize(hmd, ovrEye_Right, hmd->DefaultEyeFov[1], 1.0);

106

107 SDL_GetWindowSize(win, &win_width, &win_height);

108

109 fb_width = eyeres[0].w + eyeres[1].w;

110 fb_height = eyeres[0].h > eyeres[1].h ? eyeres[0].h : eyeres[1].h;

111 update_rtarg(fb_width, fb_height);

112

113 for(i=0; i<2; i++) {

114 fb_ovr_tex[i].OGL.Header.API = ovrRenderAPI_OpenGL;

115 fb_ovr_tex[i].OGL.Header.TextureSize.w = fb_tex_width;

116 fb_ovr_tex[i].OGL.Header.TextureSize.h = fb_tex_height;

117 fb_ovr_tex[i].OGL.Header.RenderViewport.Pos.y = 0;

118 fb_ovr_tex[i].OGL.Header.RenderViewport.Size.w = fb_width / 2.0;

119 fb_ovr_tex[i].OGL.Header.RenderViewport.Size.h = fb_height;

120 fb_ovr_tex[i].OGL.TexId = fb_tex;

121 }

122 fb_ovr_tex[0].OGL.Header.RenderViewport.Pos.x = 0;

123 fb_ovr_tex[1].OGL.Header.RenderViewport.Pos.x = fb_width / 2.0;

124

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

126 glcfg.OGL.Header.API = ovrRenderAPI_OpenGL;

127 glcfg.OGL.Header.RTSize = hmd->Resolution;

128 glcfg.OGL.Header.Multisample = 1;

129

130 if(hmd->HmdCaps & ovrHmdCap_ExtendDesktop) {

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

132 } else {

133 #ifdef WIN32

134 void *sys_win = GetActiveWindow();

135 glcfg.OGL.Window = sys_win;

136 glcfg.OGL.DC = wglGetCurrentDC();

137 ovrHmd_AttachToWindow(hmd, sys_win, 0, 0);

138 #endif

139 printf("running in \"direct-hmd\" mode\n");

140 }

141 ovrHmd_SetEnabledCaps(hmd, ovrHmdCap_LowPersistence | ovrHmdCap_DynamicPrediction);

142

143 dcaps = ovrDistortionCap_Chromatic | ovrDistortionCap_Vignette | ovrDistortionCap_TimeWarp;

144 if(!ovrHmd_ConfigureRendering(hmd, &glcfg.Config, dcaps, hmd->DefaultEyeFov, eye_rdesc)) {

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

146 }

147

148 /* ovrhmd_EnableHSWDisplaySDKRender(hmd, 0); */

149

150

151 glEnable(GL_DEPTH_TEST);

152 glEnable(GL_CULL_FACE);

153 glEnable(GL_LIGHTING);

154 glEnable(GL_LIGHT0);

155

156 glClearColor(0.5, 0.05, 0.05, 1);

157

158 return 0;

159 }

160

161 void cleanup(void)

162 {

163 if(hmd) {

164 ovrHmd_Destroy(hmd);

165 }

166 ovr_Shutdown();

167

168 SDL_Quit();

169 }

170

171 void display(void)

172 {

173 int i;

174 ovrMatrix4f proj;

175 ovrPosef pose[2];

176

177 ovrHmd_BeginFrame(hmd, 0);

178

179 glBindFramebuffer(GL_FRAMEBUFFER, fbo);

180 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

181

182 /* for each eye ... */

183 for(i=0; i<2; i++) {

184 int eye = hmd->EyeRenderOrder[i];

185

186 /* vport0(0, 0, width/2, height), vport1(width/2, 0, width/2, height) */

187 glViewport(eye == 0 ? 0 : fb_width / 2, 0, fb_width / 2, fb_height);

188

189 proj = ovrMatrix4f_Projection(hmd->DefaultEyeFov[eye], 0.5, 500.0, 1);

190 glMatrixMode(GL_PROJECTION);

191 glLoadMatrixf(proj.M[0]);

192

193 pose[eye] = ovrHmd_GetEyePose(hmd, eye);

194 glMatrixMode(GL_MODELVIEW);

195 /* TODO: get HMD orientation data and use them */

196 glTranslatef(0, -ovrHmd_GetFloat(hmd, OVR_KEY_EYE_HEIGHT, 1.65), 0);

197

198 draw_scene();

199 }

200

201 glBindFramebuffer(GL_FRAMEBUFFER, 0);

202 glViewport(0, 0, win_width, win_height);

203

204 ovrHmd_EndFrame(hmd, pose, &fb_ovr_tex[0].Texture);

205

206 assert(glGetError() == GL_NO_ERROR);

207 }

208

209 void draw_scene(void)

210 {

211 int i;

212 float lpos[] = {0, 5, 0, 1};

213 glLightfv(GL_LIGHT0, GL_POSITION, lpos);

214

215 glTranslatef(0, 5, 0);

216 draw_box(20, 10, 20, -1.0);

217

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

219 glPushMatrix();

220 if(i & 1) {

221 glTranslatef(0, 0, i & 2 ? 7.5 : -7.5);

222 } else {

223 glTranslatef(i & 2 ? 7.5 : -7.5, 0, 0);

224 }

225 draw_box(3, 0, 3, 1.0);

226 glPopMatrix();

227 }

228 }

229

230 void draw_box(float xsz, float ysz, float zsz, float norm_sign)

231 {

232 glMatrixMode(GL_MODELVIEW);

233 glScalef(xsz * 0.5, ysz * 0.5, zsz * 0.5);

234

235 if(norm_sign < 0.0) {

236 glFrontFace(GL_CW);

237 }

238

239 glBegin(GL_QUADS);

240 glNormal3f(0, 0, 1 * norm_sign);

241 glTexCoord2f(0, 0); glVertex3f(-1, -1, 1);

242 glTexCoord2f(1, 0); glVertex3f(1, -1, 1);

243 glTexCoord2f(1, 1); glVertex3f(1, 1, 1);

244 glTexCoord2f(0, 1); glVertex3f(-1, 1, 1);

245 glNormal3f(1 * norm_sign, 0, 0);

246 glTexCoord2f(0, 0); glVertex3f(1, -1, 1);

247 glTexCoord2f(1, 0); glVertex3f(1, -1, -1);

248 glTexCoord2f(1, 1); glVertex3f(1, 1, -1);

249 glTexCoord2f(0, 1); glVertex3f(1, 1, 1);

250 glNormal3f(0, 0, -1 * norm_sign);

251 glTexCoord2f(0, 0); glVertex3f(1, -1, -1);

252 glTexCoord2f(1, 0); glVertex3f(-1, -1, -1);

253 glTexCoord2f(1, 1); glVertex3f(-1, 1, -1);

254 glTexCoord2f(0, 1); glVertex3f(1, 1, -1);

255 glNormal3f(-1 * norm_sign, 0, 0);

256 glTexCoord2f(0, 0); glVertex3f(-1, -1, -1);

257 glTexCoord2f(1, 0); glVertex3f(-1, -1, 1);

258 glTexCoord2f(1, 1); glVertex3f(-1, 1, 1);

259 glTexCoord2f(0, 1); glVertex3f(-1, 1, -1);

260 glNormal3f(0, 1 * norm_sign, 0);

261 glTexCoord2f(0, 0); glVertex3f(-1, 1, 1);

262 glTexCoord2f(1, 0); glVertex3f(1, 1, 1);

263 glTexCoord2f(1, 1); glVertex3f(1, 1, -1);

264 glTexCoord2f(0, 1); glVertex3f(-1, 1, -1);

265 glNormal3f(0, -1 * norm_sign, 0);

266 glTexCoord2f(0, 0); glVertex3f(-1, -1, -1);

267 glTexCoord2f(1, 0); glVertex3f(1, -1, -1);

268 glTexCoord2f(1, 1); glVertex3f(1, -1, 1);

269 glTexCoord2f(0, 1); glVertex3f(-1, -1, 1);

270 glEnd();

271

272 glFrontFace(GL_CCW);

273 }

274

275 void update_rtarg(int width, int height)

276 {

277 if(!fbo) {

278 glGenFramebuffers(1, &fbo);

279 glGenTextures(1, &fb_tex);

280 glGenRenderbuffers(1, &fb_depth);

281

282 glBindTexture(GL_TEXTURE_2D, fb_tex);

283 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

284 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

285 }

286

287 glBindFramebuffer(GL_FRAMEBUFFER, fbo);

288

289 fb_tex_width = next_pow2(width);

290 fb_tex_height = next_pow2(height);

291

292 glBindTexture(GL_TEXTURE_2D, fb_tex);

293 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, fb_tex_width, fb_tex_height, 0,

294 GL_RGBA, GL_UNSIGNED_BYTE, 0);

295 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb_tex, 0);

296

297 glBindRenderbuffer(GL_RENDERBUFFER, fb_depth);

298 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, fb_tex_width, fb_tex_height);

299 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fb_depth);

300

301 if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {

302 fprintf(stderr, "incomplete framebuffer!\n");

303 }

304

305 glBindFramebuffer(GL_FRAMEBUFFER, 0);

306 printf("created render target: %dx%d (texture size: %dx%d)\n", width, height, fb_tex_width, fb_tex_height);

307 }

308

309 int handle_event(SDL_Event *ev)

310 {

311 switch(ev->type) {

312 case SDL_KEYDOWN:

313 case SDL_KEYUP:

314 if(key_event(ev->key.keysym.sym, ev->key.state == SDL_PRESSED) == -1) {

315 return -1;

316 }

317 break;

318

319 default:

320 break;

321 }

322

323 return 0;

324 }

325

326 int key_event(int key, int state)

327 {

328 if(state) {

329 switch(key) {

330 case 27:

331 return -1;

332

333 default:

334 break;

335 }

336 }

337 return 0;

338 }

339

340 unsigned int next_pow2(unsigned int x)

341 {

342 x -= 1;

343 x |= x >> 1;

344 x |= x >> 2;

345 x |= x >> 4;

346 x |= x >> 8;

347 x |= x >> 16;

348 return x + 1;

349 }