istereo2: 2b85d05df3f2 src/istereo.c

istereo2

view src/istereo.c @ 20:2b85d05df3f2

animation controls for easier screenshot grabbing

author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 02 Oct 2015 04:54:55 +0300
parents	25d821ab1ca2
children	c6971ff4795e

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 void redraw(void)

142 {

143 float pan_x, pan_y, z;

144 sys_msec = get_time_msec();

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

146 double tsec = time_msec / 1000.0;

147

148 z = ring_height * segm;

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

150

151 if(use_bump) {

152 glClearColor(0.01, 0.01, 0.01, 1.0);

153 tunnel_speed = 0.5;

154 } else {

155 glClearColor(0.6, 0.6, 0.6, 1.0);

156 tunnel_speed = 0.75;

157 }

158 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

159

160 if(stereo) {

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

162

163 /* left eye */

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

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

166

167 gl_matrix_mode(GL_PROJECTION);

168 gl_load_identity();

169 cam_stereo_proj_matrix(CAM_LEFT);

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

171

172 gl_matrix_mode(GL_MODELVIEW);

173 gl_load_identity();

174 cam_stereo_view_matrix(CAM_LEFT);

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

176

177 render(tsec);

178

179 /* right eye */

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

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

182

183 gl_matrix_mode(GL_PROJECTION);

184 gl_load_identity();

185 cam_stereo_proj_matrix(CAM_RIGHT);

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

187

188 gl_matrix_mode(GL_MODELVIEW);

189 gl_load_identity();

190 cam_stereo_view_matrix(CAM_RIGHT);

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

192

193 render(tsec);

194 } else {

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

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

197

198 gl_matrix_mode(GL_PROJECTION);

199 gl_load_identity();

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

201 cam_proj_matrix();

202

203 gl_matrix_mode(GL_MODELVIEW);

204 gl_load_identity();

205 cam_view_matrix();

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

207

208 render(tsec);

209 }

210

211 #ifndef STEREO_GUI

212 if(ui_visible()) {

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

214 ui_draw();

215 }

216 #endif

217

218 assert(glGetError() == GL_NO_ERROR);

219 }

220

221 static void render(float t)

222 {

223 int i;

224 float text_line;

225

226 draw_tunnel(t);

227

228 if(use_bump) {

229 glDepthMask(0);

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

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

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

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

234 }

235 glDepthMask(1);

236 }

237

238 #ifdef STEREO_GUI

239 if(ui_visible()) {

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

241 ui_draw();

242 }

243 #endif

244 }

245

246 static void draw_tunnel(float t)

247 {

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

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

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

251 float du, dv;

252

253 prog = use_bump ? prog_tunnel : prog_simple;

254

255 bind_program(prog);

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

257

258 if(use_bump) {

259 vec3_t ltpos = calc_text_pos(t);

260

261 bind_texture(tex_normal, 1);

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

263 bind_texture(tex_stones, 0);

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

265

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

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

268 } else {

269 bind_texture(tex, 0);

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

271 }

272

273 gl_matrix_mode(GL_TEXTURE);

274 gl_load_identity();

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

276

277 gl_begin(GL_QUADS);

278 gl_color3f(1.0, 1.0, 1.0);

279

280 du = 1.0 / sides;

281 dv = 1.0 / segm;

282

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

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

285

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

287 float z0 = ring_height * i;

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

289

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

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

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

293

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

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

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

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

298

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

300 }

301 }

302 }

303 gl_end();

304

305 bind_texture(0, 1);

306 bind_texture(0, 0);

307 }

308

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

310 {

311 vec3_t pos, norm;

312 vec3_t dfdu, dfdv, pos_du, pos_dv;

313

314 float theta = 2.0 * M_PI * u;

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

316

317 float x = cos(theta);

318 float y = sin(theta);

319 float x1 = cos(theta1);

320 float y1 = sin(theta1);

321 float z = v / dv * ring_height;

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

323

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

325

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

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

328

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

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

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

332

333 dfdu = v3_sub(pos_du, pos);

334 dfdv = v3_sub(pos_dv, pos);

335 norm = v3_cross(dfdv, dfdu);

336

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

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

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

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

341 }

342

343 static vec3_t calc_text_pos(float sec)

344 {

345 float t = text_speed * sec;

346 float z = fmod(t, text_period);

347 float pan[2];

348

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

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

351 }

352

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

354 {

355 gl_matrix_mode(GL_MODELVIEW);

356 gl_push_matrix();

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

358

359 glEnable(GL_BLEND);

360 glBlendFunc(GL_SRC_ALPHA, GL_ONE);

361

362 bind_program(prog_text);

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

364

365 bind_texture(tex_text, 0);

366

367 gl_begin(GL_QUADS);

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

369

370 gl_texcoord2f(0, 1);

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

372

373 gl_texcoord2f(1, 1);

374 gl_vertex3f(1, -0.2, 0);

375

376 gl_texcoord2f(1, 0);

377 gl_vertex3f(1, 0.2, 0);

378

379 gl_texcoord2f(0, 0);

380 gl_vertex3f(-1, 0.2, 0);

381 gl_end();

382

383 bind_texture(0, 0);

384 glDisable(GL_BLEND);

385

386 gl_pop_matrix();

387 }

388

389

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

391 {

392 float x, y;

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

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

395

396 *tx = x * 0.5;

397 *ty = y * 0.5;

398 }

399

400

401 void reshape(int x, int y)

402 {

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

404

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

406 float maxfov = 40.0;

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

408

409 cam_fov(vfov);

410

411 gl_matrix_mode(GL_PROJECTION);

412 gl_load_identity();

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

414

415 view_xsz = x;

416 view_ysz = y;

417 view_aspect = aspect;

418

419 ui_reshape(x, y);

420 }

421

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

423 {

424 if(show_opt) {

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

426 } else {

427 if(press) {

428 show_opt = 1;

429 ui_show();

430 }

431 }

432 }

433

434 void mouse_motion(int x, int y)

435 {

436 if(show_opt) {

437 ui_motion(x, y);

438 }

439 }

440

441 void playpause(void)

442 {

443 paused = !paused;

444 if(paused) {

445 last_pause = sys_msec;

446 } else {

447 time_offset -= sys_msec - last_pause;

448 }

449 }

450

451 void seektime(long msec)

452 {

453 time_offset -= msec;

454 }

455

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

457 {

458 unsigned int prog, vs, ps;

459

460 if(!(vs = get_vertex_shader(find_resource(vfile, 0, 0)))) {

461 return 0;

462 }

463 if(!(ps = get_pixel_shader(find_resource(pfile, 0, 0)))) {

464 return 0;

465 }

466

467 if(!(prog = create_program_link(vs, ps))) {

468 return 0;

469 }

470 return prog;

471 }