istereo2: a3c4fcc9f8f3 src/istereo.c

istereo2

view src/istereo.c @ 7:a3c4fcc9f8f3

- started a goatkit UI theme - font rendering with drawtext and shaders - asset manager (only used by drawtext for now, will replace respath eventually)

author	John Tsiombikas <nuclear@member.fsf.org>
date	Thu, 24 Sep 2015 06:49:25 +0300
parents	3bccfc7d10fe
children	661bf09db398

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"

36 static void render(float t);

37 static void draw_tunnel(float t);

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

39 static vec3_t calc_text_pos(float sec);

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

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

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

43 static float get_sec(void);

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

46 unsigned int tex, tex_stones, tex_normal, tex_text;

47 struct dtx_font *font;

49 int view_xsz, view_ysz;

51 int stereo = 0;

52 int use_bump = 0;

53 int show_opt = 1;

55 /* construction parameters */

56 int sides = 24;

57 int segm = 20;

58 float tunnel_speed = 0.75;

59 float ring_height = 0.5;

60 float text_period = 13.0;

61 float text_speed = 2.2;

63 float split = 0.5275;

65 int init(void)

66 {

67 add_resource_path("sdr");

68 add_resource_path("data");

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

71 return -1;

72 }

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

74 return -1;

75 }

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

77 return -1;

78 }

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

80 return -1;

81 }

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

83 return -1;

84 }

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

86 return -1;

87 }

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

90 return -1;

91 }

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

93 return -1;

94 }

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

96 return -1;

97 }

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

99 return -1;

100 }

101

102 if(!(font = dtx_open_font_glyphmap(find_resource("linux-libertine_s24.glyphmap", 0, 0)))) {

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

104 return -1;

105 }

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

107 dtx_use_font(font, 24);

108

109 glEnable(GL_DEPTH_TEST);

110 glEnable(GL_CULL_FACE);

111

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

113 return -1;

114 }

115

116 cam_fov(42.5);

117 cam_clip(0.5, 250.0);

118

119 return 0;

120 }

121

122 void cleanup(void)

123 {

124 ui_shutdown();

125 free_program(prog_simple);

126 free_program(prog_tunnel);

127 free_program(prog_color);

128 free_program(prog_ui);

129 free_program(prog_font);

130 dtx_close_font(font);

131 }

132

133 void redraw(void)

134 {

135 float pan_x, pan_y, z;

136 float tsec = get_sec();

137

138 z = ring_height * segm;

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

140

141 if(use_bump) {

142 glClearColor(0.01, 0.01, 0.01, 1.0);

143 tunnel_speed = 0.5;

144 } else {

145 glClearColor(0.6, 0.6, 0.6, 1.0);

146 tunnel_speed = 0.75;

147 }

148 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

149

150 if(stereo) {

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

152

153 /* right eye */

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

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

156

157 gl_matrix_mode(GL_PROJECTION);

158 gl_load_identity();

159 cam_stereo_proj_matrix(CAM_RIGHT);

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

161

162 gl_matrix_mode(GL_MODELVIEW);

163 gl_load_identity();

164 cam_stereo_view_matrix(CAM_RIGHT);

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

166

167 render(tsec);

168

169 /* left eye */

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

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

172

173 gl_matrix_mode(GL_PROJECTION);

174 gl_load_identity();

175 cam_stereo_proj_matrix(CAM_LEFT);

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

177

178 gl_matrix_mode(GL_MODELVIEW);

179 gl_load_identity();

180 cam_stereo_view_matrix(CAM_LEFT);

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

182

183 render(tsec);

184 } else {

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

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

187

188 gl_matrix_mode(GL_PROJECTION);

189 gl_load_identity();

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

191 cam_proj_matrix();

192

193 gl_matrix_mode(GL_MODELVIEW);

194 gl_load_identity();

195 cam_view_matrix();

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

197

198 render(tsec);

199 }

200

201 /* TEST */

202 /*bind_program(prog_ui);

203

204 gl_matrix_mode(GL_PROJECTION);

205 gl_load_identity();

206 gl_ortho(0, view_xsz, 0, view_ysz, -1, 1);

207 gl_matrix_mode(GL_MODELVIEW);

208 gl_load_identity();

209 gl_apply_xform(prog_ui);

210

211 glDisable(GL_DEPTH_TEST);

212 dtx_printf("hello world\n");

213 glEnable(GL_DEPTH_TEST);*/

214

215 assert(glGetError() == GL_NO_ERROR);

216 }

217

218 static void render(float t)

219 {

220 int i;

221 float text_line;

222

223 draw_tunnel(t);

224

225 if(use_bump) {

226 glDepthMask(0);

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

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

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

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

231 }

232 glDepthMask(1);

233 }

234

235 if(show_opt) {

236 ui_draw();

237 }

238 }

239

240 static void draw_tunnel(float t)

241 {

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

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

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

245 float du, dv;

246

247 prog = use_bump ? prog_tunnel : prog_simple;

248

249 bind_program(prog);

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

251

252 if(use_bump) {

253 vec3_t ltpos = calc_text_pos(t);

254

255 bind_texture(tex_normal, 1);

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

257 bind_texture(tex_stones, 0);

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

259

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

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

262 } else {

263 bind_texture(tex, 0);

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

265 }

266

267 gl_matrix_mode(GL_TEXTURE);

268 gl_load_identity();

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

270

271 gl_begin(GL_QUADS);

272 gl_color3f(1.0, 1.0, 1.0);

273

274 du = 1.0 / sides;

275 dv = 1.0 / segm;

276

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

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

279

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

281 float z0 = ring_height * i;

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

283

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

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

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

287

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

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

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

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

292

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

294 }

295 }

296 }

297 gl_end();

298

299 bind_texture(0, 1);

300 bind_texture(0, 0);

301 }

302

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

304 {

305 vec3_t pos, norm;

306 vec3_t dfdu, dfdv, pos_du, pos_dv;

307

308 float theta = 2.0 * M_PI * u;

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

310

311 float x = cos(theta);

312 float y = sin(theta);

313 float x1 = cos(theta1);

314 float y1 = sin(theta1);

315 float z = v / dv * ring_height;

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

317

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

319

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

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

322

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

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

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

326

327 dfdu = v3_sub(pos_du, pos);

328 dfdv = v3_sub(pos_dv, pos);

329 norm = v3_cross(dfdv, dfdu);

330

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

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

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

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

335 }

336

337 static vec3_t calc_text_pos(float sec)

338 {

339 float t = text_speed * sec;

340 float z = fmod(t, text_period);

341 float pan[2];

342

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

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

345 }

346

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

348 {

349 gl_matrix_mode(GL_MODELVIEW);

350 gl_push_matrix();

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

352

353 glEnable(GL_BLEND);

354 glBlendFunc(GL_SRC_ALPHA, GL_ONE);

355

356 bind_program(prog_text);

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

358

359 bind_texture(tex_text, 0);

360

361 gl_begin(GL_QUADS);

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

363

364 gl_texcoord2f(0, 1);

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

366

367 gl_texcoord2f(1, 1);

368 gl_vertex3f(1, -0.2, 0);

369

370 gl_texcoord2f(1, 0);

371 gl_vertex3f(1, 0.2, 0);

372

373 gl_texcoord2f(0, 0);

374 gl_vertex3f(-1, 0.2, 0);

375 gl_end();

376

377 bind_texture(0, 0);

378 glDisable(GL_BLEND);

379

380 gl_pop_matrix();

381 }

382

383

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

385 {

386 float x, y;

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

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

389

390 *tx = x * 0.5;

391 *ty = y * 0.5;

392 }

393

394

395 void reshape(int x, int y)

396 {

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

398

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

400 float maxfov = 40.0;

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

402

403 cam_fov(vfov);

404

405 gl_matrix_mode(GL_PROJECTION);

406 gl_load_identity();

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

408

409 view_xsz = x;

410 view_ysz = y;

411

412 ui_reshape(x, y);

413 }

414

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

416 {

417 if(show_opt) {

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

419 }

420 }

421

422 void mouse_motion(int x, int y)

423 {

424 if(show_opt) {

425 ui_motion(x, y);

426 }

427 }

428

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

430 {

431 unsigned int prog, vs, ps;

432

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

434 return 0;

435 }

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

437 return 0;

438 }

439

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

441 return 0;

442 }

443 return prog;

444 }

445

446

447 #ifdef IPHONE

448 #include <QuartzCore/QuartzCore.h>

449

450 static float get_sec(void)

451 {

452 static float first;

453 static int init;

454

455 if(!init) {

456 init = 1;

457 first = CACurrentMediaTime();

458 return 0.0f;

459 }

460 return CACurrentMediaTime() - first;

461 }

462

463 #else

464

465 static float get_sec(void)

466 {

467 return (float)glutGet(GLUT_ELAPSED_TIME) / 1000.0f;

468 }

469 #endif