istereo2: 25d821ab1ca2 src/istereo.c

istereo2

view src/istereo.c @ 18:25d821ab1ca2

fixed ios bugs

author	John Tsiombikas <nuclear@member.fsf.org>
date	Thu, 01 Oct 2015 08:36:55 +0300
parents	f4dd01c36b0c
children	2b85d05df3f2

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 int stereo = 0;

55 int use_bump = 0;

56 int show_opt = 1;

58 /* construction parameters */

59 int sides = 24;

60 int segm = 20;

61 float tunnel_speed = 0.75;

62 float ring_height = 0.5;

63 float text_period = 13.0;

64 float text_speed = 2.2;

66 float split = 0.4725;

68 int init(void)

69 {

70 add_resource_path("sdr");

71 add_resource_path("data");

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

74 return -1;

75 }

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

77 return -1;

78 }

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

80 return -1;

81 }

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

83 return -1;

84 }

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

86 return -1;

87 }

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

89 return -1;

90 }

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

93 return -1;

94 }

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

96 return -1;

97 }

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

99 return -1;

100 }

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

102 return -1;

103 }

104

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

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

107 return -1;

108 }

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

110

111 glEnable(GL_DEPTH_TEST);

112 glEnable(GL_CULL_FACE);

113

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

115 return -1;

116 }

117 if(show_opt) {

118 ui_show();

119 }

120

121 cam_fov(42.5);

122 cam_clip(0.5, 250.0);

123

124 return 0;

125 }

126

127 void cleanup(void)

128 {

129 ui_shutdown();

130 free_program(prog_simple);

131 free_program(prog_tunnel);

132 free_program(prog_color);

133 free_program(prog_ui);

134 free_program(prog_font);

135 dtx_close_font(font);

136 }

137

138 void redraw(void)

139 {

140 float pan_x, pan_y, z;

141 float tsec = get_time_sec();

142

143 z = ring_height * segm;

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

145

146 if(use_bump) {

147 glClearColor(0.01, 0.01, 0.01, 1.0);

148 tunnel_speed = 0.5;

149 } else {

150 glClearColor(0.6, 0.6, 0.6, 1.0);

151 tunnel_speed = 0.75;

152 }

153 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

154

155 if(stereo) {

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

157

158 /* left eye */

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

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

161

162 gl_matrix_mode(GL_PROJECTION);

163 gl_load_identity();

164 cam_stereo_proj_matrix(CAM_LEFT);

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

166

167 gl_matrix_mode(GL_MODELVIEW);

168 gl_load_identity();

169 cam_stereo_view_matrix(CAM_LEFT);

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

171

172 render(tsec);

173

174 /* right eye */

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

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

177

178 gl_matrix_mode(GL_PROJECTION);

179 gl_load_identity();

180 cam_stereo_proj_matrix(CAM_RIGHT);

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

182

183 gl_matrix_mode(GL_MODELVIEW);

184 gl_load_identity();

185 cam_stereo_view_matrix(CAM_RIGHT);

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

187

188 render(tsec);

189 } else {

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

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

192

193 gl_matrix_mode(GL_PROJECTION);

194 gl_load_identity();

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

196 cam_proj_matrix();

197

198 gl_matrix_mode(GL_MODELVIEW);

199 gl_load_identity();

200 cam_view_matrix();

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

202

203 render(tsec);

204 }

205

206 #ifndef STEREO_GUI

207 if(ui_visible()) {

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

209 ui_draw();

210 }

211 #endif

212

213 assert(glGetError() == GL_NO_ERROR);

214 }

215

216 static void render(float t)

217 {

218 int i;

219 float text_line;

220

221 draw_tunnel(t);

222

223 if(use_bump) {

224 glDepthMask(0);

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

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

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

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

229 }

230 glDepthMask(1);

231 }

232

233 #ifdef STEREO_GUI

234 if(ui_visible()) {

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

236 ui_draw();

237 }

238 #endif

239 }

240

241 static void draw_tunnel(float t)

242 {

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

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

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

246 float du, dv;

247

248 prog = use_bump ? prog_tunnel : prog_simple;

249

250 bind_program(prog);

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

252

253 if(use_bump) {

254 vec3_t ltpos = calc_text_pos(t);

255

256 bind_texture(tex_normal, 1);

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

258 bind_texture(tex_stones, 0);

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

260

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

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

263 } else {

264 bind_texture(tex, 0);

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

266 }

267

268 gl_matrix_mode(GL_TEXTURE);

269 gl_load_identity();

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

271

272 gl_begin(GL_QUADS);

273 gl_color3f(1.0, 1.0, 1.0);

274

275 du = 1.0 / sides;

276 dv = 1.0 / segm;

277

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

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

280

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

282 float z0 = ring_height * i;

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

284

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

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

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

288

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

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

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

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

293

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

295 }

296 }

297 }

298 gl_end();

299

300 bind_texture(0, 1);

301 bind_texture(0, 0);

302 }

303

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

305 {

306 vec3_t pos, norm;

307 vec3_t dfdu, dfdv, pos_du, pos_dv;

308

309 float theta = 2.0 * M_PI * u;

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

311

312 float x = cos(theta);

313 float y = sin(theta);

314 float x1 = cos(theta1);

315 float y1 = sin(theta1);

316 float z = v / dv * ring_height;

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

318

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

320

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

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

323

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

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

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

327

328 dfdu = v3_sub(pos_du, pos);

329 dfdv = v3_sub(pos_dv, pos);

330 norm = v3_cross(dfdv, dfdu);

331

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

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

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

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

336 }

337

338 static vec3_t calc_text_pos(float sec)

339 {

340 float t = text_speed * sec;

341 float z = fmod(t, text_period);

342 float pan[2];

343

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

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

346 }

347

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

349 {

350 gl_matrix_mode(GL_MODELVIEW);

351 gl_push_matrix();

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

353

354 glEnable(GL_BLEND);

355 glBlendFunc(GL_SRC_ALPHA, GL_ONE);

356

357 bind_program(prog_text);

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

359

360 bind_texture(tex_text, 0);

361

362 gl_begin(GL_QUADS);

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

364

365 gl_texcoord2f(0, 1);

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

367

368 gl_texcoord2f(1, 1);

369 gl_vertex3f(1, -0.2, 0);

370

371 gl_texcoord2f(1, 0);

372 gl_vertex3f(1, 0.2, 0);

373

374 gl_texcoord2f(0, 0);

375 gl_vertex3f(-1, 0.2, 0);

376 gl_end();

377

378 bind_texture(0, 0);

379 glDisable(GL_BLEND);

380

381 gl_pop_matrix();

382 }

383

384

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

386 {

387 float x, y;

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

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

390

391 *tx = x * 0.5;

392 *ty = y * 0.5;

393 }

394

395

396 void reshape(int x, int y)

397 {

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

399

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

401 float maxfov = 40.0;

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

403

404 cam_fov(vfov);

405

406 gl_matrix_mode(GL_PROJECTION);

407 gl_load_identity();

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

409

410 view_xsz = x;

411 view_ysz = y;

412 view_aspect = aspect;

413

414 ui_reshape(x, y);

415 }

416

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

418 {

419 if(show_opt) {

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

421 } else {

422 if(press) {

423 show_opt = 1;

424 ui_show();

425 }

426 }

427 }

428

429 void mouse_motion(int x, int y)

430 {

431 if(show_opt) {

432 ui_motion(x, y);

433 }

434 }

435

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

437 {

438 unsigned int prog, vs, ps;

439

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

441 return 0;

442 }

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

444 return 0;

445 }

446

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

448 return 0;

449 }

450 return prog;

451 }