istereo2: 900651a2f401 src/istereo.c

istereo2

view src/istereo.c @ 30:900651a2f401

foo

author	John Tsiombikas <nuclear@member.fsf.org>
date	Thu, 08 Oct 2015 06:54:18 +0300
parents	c6971ff4795e
children	33ba8618972c

line source

1 /*

2 Stereoscopic tunnel for iOS.

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU General Public License as published by

7 the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU General Public License for more details.

15 You should have received a copy of the GNU General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

20 #include <stdio.h>

21 #include <math.h>

22 #include <assert.h>

23 #include <unistd.h>

24 #include "opengl.h"

25 #include "istereo.h"

26 #include "sanegl.h"

27 #include "sdr.h"

28 #include "respath.h"

29 #include "tex.h"

30 #include "cam.h"

31 #include "vmath.h"

32 #include "config.h"

33 #include "ui.h"

34 #include "drawtext.h"

35 #include "timer.h"

37 #undef STEREO_GUI

39 static void render(float t);

40 static void draw_tunnel(float t);

41 static void tunnel_vertex(float u, float v, float du, float dv, int tang_loc, float t);

42 static vec3_t calc_text_pos(float sec);

43 static void draw_text(float idx, vec3_t tpos, float alpha);

44 static void worm(float t, float z, float *tx, float *ty);

45 static unsigned int get_shader_program(const char *vfile, const char *pfile);

47 unsigned int prog, prog_simple, prog_tunnel, prog_text, prog_color, prog_ui, prog_font;

48 unsigned int tex, tex_stones, tex_normal, tex_text;

49 struct dtx_font *font;

51 int view_xsz, view_ysz;

52 float view_aspect;

54 static int paused;

55 static long sys_msec, time_offset, time_msec, last_pause;

57 int stereo = 0;

58 int use_bump = 0;

59 int show_opt = 1;

61 /* construction parameters */

62 int sides = 24;

63 int segm = 20;

64 float tunnel_speed = 0.75;

65 float ring_height = 0.5;

66 float text_period = 13.0;

67 float text_speed = 2.2;

69 float split = 0.4725;

71 int init(void)

72 {

73 add_resource_path("sdr");

74 add_resource_path("data");

76 if(!(prog_simple = get_shader_program("test.v.glsl", "test.p.glsl"))) {

77 return -1;

78 }

79 if(!(prog_tunnel = get_shader_program("tunnel.v.glsl", "tunnel.p.glsl"))) {

80 return -1;

81 }

82 if(!(prog_text = get_shader_program("text.v.glsl", "text.p.glsl"))) {

83 return -1;

84 }

85 if(!(prog_color = get_shader_program("color.v.glsl", "color.p.glsl"))) {

86 return -1;

87 }

88 if(!(prog_ui = get_shader_program("ui.v.glsl", "ui.p.glsl"))) {

89 return -1;

90 }

91 if(!(prog_font = get_shader_program("ui.v.glsl", "font.p.glsl"))) {

92 return -1;

93 }

95 if(!(tex = load_texture(find_resource("tiles.jpg", 0, 0)))) {

96 return -1;

97 }

98 if(!(tex_stones = load_texture(find_resource("stonewall.jpg", 0, 0)))) {

99 return -1;

100 }

101 if(!(tex_normal = load_texture(find_resource("stonewall_normal.jpg", 0, 0)))) {

102 return -1;

103 }

104 if(!(tex_text = load_texture(find_resource("text.png", 0, 0)))) {

105 return -1;

106 }

107

108 if(!(font = dtx_open_font_glyphmap(find_resource("droidsans_s24.glyphmap", 0, 0)))) {

109 fprintf(stderr, "failed to load font\n");

110 return -1;

111 }

112 dtx_vertex_attribs(get_attrib_loc(prog_ui, "attr_vertex"), get_attrib_loc(prog_ui, "attr_texcoord"));

113

114 glEnable(GL_DEPTH_TEST);

115 glEnable(GL_CULL_FACE);

116

117 if(ui_init() == -1) {

118 return -1;

119 }

120 if(show_opt) {

121 ui_show();

122 }

123

124 cam_fov(42.5);

125 cam_clip(0.5, 250.0);

126

127 return 0;

128 }

129

130 void cleanup(void)

131 {

132 ui_shutdown();

133 free_program(prog_simple);

134 free_program(prog_tunnel);

135 free_program(prog_color);

136 free_program(prog_ui);

137 free_program(prog_font);

138 dtx_close_font(font);

139 }

140

141 static int time_print_pending;

142

143 void redraw(void)

144 {

145 float pan_x, pan_y, z;

146 sys_msec = get_time_msec();

147 time_msec = (paused ? last_pause : sys_msec) + time_offset;

148 double tsec = time_msec / 1000.0;

149

150 z = ring_height * segm;

151 worm(tsec, z, &pan_x, &pan_y);

152

153 if(use_bump) {

154 glClearColor(0.01, 0.01, 0.01, 1.0);

155 tunnel_speed = 0.5;

156 } else {

157 glClearColor(0.6, 0.6, 0.6, 1.0);

158 tunnel_speed = 0.75;

159 }

160 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

161

162 if(stereo) {

163 int split_pt = (int)((float)view_xsz * split);

164

165 /* left eye */

166 glViewport(0, 0, split_pt, view_ysz);

167 cam_aspect((float)split_pt / (float)view_ysz);

168

169 gl_matrix_mode(GL_PROJECTION);

170 gl_load_identity();

171 cam_stereo_proj_matrix(CAM_LEFT);

172 //gl_rotatef(-90, 0, 0, 1);

173

174 gl_matrix_mode(GL_MODELVIEW);

175 gl_load_identity();

176 cam_stereo_view_matrix(CAM_LEFT);

177 gl_translatef(-pan_x, -pan_y, -1.1 * ring_height * segm);

178

179 render(tsec);

180

181 /* right eye */

182 glViewport(split_pt, 0, view_xsz - split_pt, view_ysz);

183 cam_aspect((float)(view_xsz - split_pt) / (float)view_ysz);

184

185 gl_matrix_mode(GL_PROJECTION);

186 gl_load_identity();

187 cam_stereo_proj_matrix(CAM_RIGHT);

188 //gl_rotatef(-90, 0, 0, 1);

189

190 gl_matrix_mode(GL_MODELVIEW);

191 gl_load_identity();

192 cam_stereo_view_matrix(CAM_RIGHT);

193 gl_translatef(-pan_x, -pan_y, -1.1 * ring_height * segm);

194

195 render(tsec);

196 } else {

197 glViewport(0, 0, view_xsz, view_ysz);

198 cam_aspect((float)view_xsz / (float)view_ysz);

199

200 gl_matrix_mode(GL_PROJECTION);

201 gl_load_identity();

202 //gl_rotatef(-90, 0, 0, 1);

203 cam_proj_matrix();

204

205 gl_matrix_mode(GL_MODELVIEW);

206 gl_load_identity();

207 cam_view_matrix();

208 gl_translatef(-pan_x, -pan_y, -1.1 * ring_height * segm);

209

210 render(tsec);

211 }

212

213 #ifndef STEREO_GUI

214 if(ui_visible()) {

215 glViewport(0, 0, view_xsz, view_ysz);

216 ui_draw();

217 }

218 #endif

219

220 assert(glGetError() == GL_NO_ERROR);

221

222 if(time_print_pending) {

223 printf("t: %lds %ldms\n", time_msec / 1000, time_msec % 1000);

224 time_print_pending = 0;

225 }

226 }

227

228 static void render(float t)

229 {

230 int i;

231 float text_line;

232

233 draw_tunnel(t);

234

235 if(use_bump) {

236 glDepthMask(0);

237 text_line = floor((text_speed * t) / text_period);

238 for(i=0; i<8; i++) {

239 vec3_t tpos = calc_text_pos(t - (float)i * 0.011);

240 draw_text(text_line, tpos, 1.5 / (float)i);

241 }

242 glDepthMask(1);

243 }

244

245 #ifdef STEREO_GUI

246 if(ui_visible()) {

247 ui_reshape(stereo ? view_xsz / 2.0 : view_xsz, view_ysz);

248 ui_draw();

249 }

250 #endif

251 }

252

253 static void draw_tunnel(float t)

254 {

255 static const float uoffs[] = {0.0, 0.0, 1.0, 1.0};

256 static const float voffs[] = {0.0, 1.0, 1.0, 0.0};

257 int i, j, k, tang_loc = -1;

258 float du, dv;

259

260 prog = use_bump ? prog_tunnel : prog_simple;

261

262 bind_program(prog);

263 set_uniform_float(prog, "t", t);

264

265 if(use_bump) {

266 vec3_t ltpos = calc_text_pos(t);

267

268 bind_texture(tex_normal, 1);

269 set_uniform_int(prog, "tex_norm", 1);

270 bind_texture(tex_stones, 0);

271 set_uniform_int(prog, "tex", 0);

272

273 set_uniform_float4(prog, "light_pos", ltpos.x, ltpos.y, ltpos.z, 1.0);

274 tang_loc = get_attrib_loc(prog, "attr_tangent");

275 } else {

276 bind_texture(tex, 0);

277 set_uniform_int(prog, "tex", 0);

278 }

279

280 gl_matrix_mode(GL_TEXTURE);

281 gl_load_identity();

282 gl_translatef(0, -fmod(t * tunnel_speed, 1.0), 0);

283

284 gl_begin(GL_QUADS);

285 gl_color3f(1.0, 1.0, 1.0);

286

287 du = 1.0 / sides;

288 dv = 1.0 / segm;

289

290 for(i=0; i<segm; i++) {

291 float trans_zp[2], trans_z0[2], trans_z1[2];

292

293 float zp = ring_height * (i - 1);

294 float z0 = ring_height * i;

295 float z1 = ring_height * (i + 1);

296

297 worm(t, zp, trans_zp, trans_zp + 1);

298 worm(t, z0, trans_z0, trans_z0 + 1);

299 worm(t, z1, trans_z1, trans_z1 + 1);

300

301 for(j=0; j<sides; j++) {

302 for(k=0; k<4; k++) {

303 float u = (j + uoffs[k]) * du;

304 float v = (i + voffs[k]) * dv;

305

306 tunnel_vertex(u, v, du, dv, tang_loc, t);

307 }

308 }

309 }

310 gl_end();

311

312 bind_texture(0, 1);

313 bind_texture(0, 0);

314 }

315

316 static void tunnel_vertex(float u, float v, float du, float dv, int tang_loc, float t)

317 {

318 vec3_t pos, norm;

319 vec3_t dfdu, dfdv, pos_du, pos_dv;

320

321 float theta = 2.0 * M_PI * u;

322 float theta1 = 2.0 * M_PI * (u + du);

323

324 float x = cos(theta);

325 float y = sin(theta);

326 float x1 = cos(theta1);

327 float y1 = sin(theta1);

328 float z = v / dv * ring_height;

329 float z1 = (v + dv) / dv * ring_height;

330

331 float trans_z[2], trans_z1[2];

332

333 worm(t, z, trans_z, trans_z + 1);

334 worm(t, z1, trans_z1, trans_z1 + 1);

335

336 pos = v3_cons(x + trans_z[0], y + trans_z[1], z);

337 pos_du = v3_cons(x1 + trans_z[0], y1 + trans_z[1], z);

338 pos_dv = v3_cons(x + trans_z1[0], y + trans_z1[1], z1);

339

340 dfdu = v3_sub(pos_du, pos);

341 dfdv = v3_sub(pos_dv, pos);

342 norm = v3_cross(dfdv, dfdu);

343

344 gl_vertex_attrib3f(tang_loc, dfdu.x, -dfdu.y, dfdu.z);

345 gl_normal3f(norm.x, norm.y, norm.z);

346 gl_texcoord2f(u * 2.0, v * 4.0);

347 gl_vertex3f(pos.x, pos.y, pos.z);

348 }

349

350 static vec3_t calc_text_pos(float sec)

351 {

352 float t = text_speed * sec;

353 float z = fmod(t, text_period);

354 float pan[2];

355

356 worm(sec, z, pan, pan + 1);

357 return v3_cons(pan[0], pan[1], z + ring_height);

358 }

359

360 static void draw_text(float idx, vec3_t tpos, float alpha)

361 {

362 gl_matrix_mode(GL_MODELVIEW);

363 gl_push_matrix();

364 gl_translatef(tpos.x, tpos.y, tpos.z);

365

366 glEnable(GL_BLEND);

367 glBlendFunc(GL_SRC_ALPHA, GL_ONE);

368

369 bind_program(prog_text);

370 set_uniform_float(prog_text, "idx", idx);

371

372 bind_texture(tex_text, 0);

373

374 gl_begin(GL_QUADS);

375 gl_color4f(1.0, 1.0, 1.0, alpha > 1.0 ? 1.0 : alpha);

376

377 gl_texcoord2f(0, 1);

378 gl_vertex3f(-1, -0.2, 0);

379

380 gl_texcoord2f(1, 1);

381 gl_vertex3f(1, -0.2, 0);

382

383 gl_texcoord2f(1, 0);

384 gl_vertex3f(1, 0.2, 0);

385

386 gl_texcoord2f(0, 0);

387 gl_vertex3f(-1, 0.2, 0);

388 gl_end();

389

390 bind_texture(0, 0);

391 glDisable(GL_BLEND);

392

393 gl_pop_matrix();

394 }

395

396

397 static void worm(float t, float z, float *tx, float *ty)

398 {

399 float x, y;

400 x = sin(t) + cos(t + z) + sin(t * 2.0 + z) / 2.0;

401 y = cos(t) + sin(t + z) + cos(t * 2.0 + z) / 2.0;

402

403 *tx = x * 0.5;

404 *ty = y * 0.5;

405 }

406

407

408 void reshape(int x, int y)

409 {

410 glViewport(0, 0, x, y);

411

412 float aspect = (float)x / (float)y;

413 float maxfov = 42.0;

414 float vfov = aspect > 1.0 ? maxfov / aspect : maxfov;

415

416 cam_fov(vfov);

417

418 gl_matrix_mode(GL_PROJECTION);

419 gl_load_identity();

420 glu_perspective(vfov, aspect, 0.5, 500.0);

421

422 view_xsz = x;

423 view_ysz = y;

424 view_aspect = aspect;

425

426 ui_reshape(x, y);

427 }

428

429 void mouse_button(int bn, int press, int x, int y)

430 {

431 if(show_opt) {

432 ui_button(bn, press, x, y);

433 } else {

434 if(press) {

435 show_opt = 1;

436 ui_show();

437 }

438 }

439 }

440

441 void mouse_motion(int x, int y)

442 {

443 if(show_opt) {

444 ui_motion(x, y);

445 }

446 }

447

448 void playpause(void)

449 {

450 paused = !paused;

451 if(paused) {

452 last_pause = sys_msec;

453 time_print_pending = 1;

454 } else {

455 time_offset -= sys_msec - last_pause;

456 }

457 }

458

459 void seektime(long msec)

460 {

461 time_offset += msec;

462 time_print_pending = 1;

463 }

464

465 static unsigned int get_shader_program(const char *vfile, const char *pfile)

466 {

467 unsigned int prog, vs, ps;

468

469 if(!(vs = load_vertex_shader(find_resource(vfile, 0, 0)))) {

470 return 0;

471 }

472 if(!(ps = load_pixel_shader(find_resource(pfile, 0, 0)))) {

473 return 0;

474 }

475

476 if(!(prog = create_program_link(vs, ps, 0))) {

477 return 0;

478 }

479 return prog;

480 }