istereo: 8dd271942543 src/istereo.c

istereo

view src/istereo.c @ 30:8dd271942543

fixed everything

author	John Tsiombikas <nuclear@mutantstargoat.com>
date	Thu, 08 Sep 2011 14:52:13 +0300
parents	fd39c0198935
children	bc6db80aaa58

line source

1 #include <stdio.h>

2 #include <math.h>

3 #include <assert.h>

4 #include <unistd.h>

5 #include "opengl.h"

6 #include "istereo.h"

7 #include "sanegl.h"

8 #include "sdr.h"

9 #include "respath.h"

10 #include "tex.h"

11 #include "cam.h"

12 #include "vmath.h"

13 #include "config.h"

15 static void render(float t);

16 static void draw_tunnel(float t);

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

18 static vec3_t calc_text_pos(float sec);

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

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

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

22 static float get_sec(void);

24 unsigned int prog, prog_simple, prog_tunnel, prog_text;

25 unsigned int tex, tex_stones, tex_normal, tex_text;

27 int view_xsz, view_ysz;

29 #ifdef IPHONE

30 int stereo = 1;

31 #else

32 int stereo = 0;

33 #endif

34 int use_bump = 0;

36 /* construction parameters */

37 int sides = 24;

38 int segm = 20;

39 float tunnel_speed = 0.75;

40 float ring_height = 0.5;

41 float text_period = 13.0;

42 float text_speed = 2.2;

44 float split = 0.5275;

46 int init(void)

47 {

48 add_resource_path("sdr");

49 add_resource_path("data");

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

52 return -1;

53 }

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

55 return -1;

56 }

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

58 return -1;

59 }

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

62 return -1;

63 }

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

65 return -1;

66 }

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

68 return -1;

69 }

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

71 return -1;

72 }

74 glEnable(GL_DEPTH_TEST);

75 glEnable(GL_CULL_FACE);

77 cam_fov(42.5);

78 cam_clip(0.5, 250.0);

80 return 0;

81 }

83 void cleanup(void)

84 {

85 free_program(prog);

86 }

88 void redraw(void)

89 {

90 float pan_x, pan_y, z;

91 float tsec = get_sec();

93 z = ring_height * segm;

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

96 if(use_bump) {

97 glClearColor(0.01, 0.01, 0.01, 1.0);

98 tunnel_speed = 0.5;

99 } else {

100 glClearColor(0.6, 0.6, 0.6, 1.0);

101 tunnel_speed = 0.75;

102 }

103 glClearDepthf(1.0);

104 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

105

106 if(stereo) {

107 int split_pt = (int)((float)view_ysz * split);

108

109 /* right eye */

110 glViewport(0, 0, view_xsz, split_pt);

111 cam_aspect((float)split_pt / (float)view_xsz);

112

113 gl_matrix_mode(GL_PROJECTION);

114 gl_load_identity();

115 cam_stereo_proj_matrix(CAM_RIGHT);

116 gl_rotatef(-90, 0, 0, 1);

117

118 gl_matrix_mode(GL_MODELVIEW);

119 gl_load_identity();

120 cam_stereo_view_matrix(CAM_RIGHT);

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

122 /*gl_rotatef(-90, 0, 0, 1);*/

123

124 render(tsec);

125

126 /* left eye */

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

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

129

130 gl_matrix_mode(GL_PROJECTION);

131 gl_load_identity();

132 cam_stereo_proj_matrix(CAM_LEFT);

133 gl_rotatef(-90, 0, 0, 1);

134

135 gl_matrix_mode(GL_MODELVIEW);

136 gl_load_identity();

137 cam_stereo_view_matrix(CAM_LEFT);

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

139 /*gl_rotatef(-90, 0, 0, 1);*/

140

141 render(tsec);

142 } else {

143 gl_matrix_mode(GL_MODELVIEW);

144 gl_load_identity();

145 cam_view_matrix();

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

147

148 render(tsec);

149 }

150

151 assert(glGetError() == GL_NO_ERROR);

152 }

153

154 static void render(float t)

155 {

156 int i;

157 float text_line;

158

159 draw_tunnel(t);

160

161 if(use_bump) {

162 glDepthMask(0);

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

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

165 vec3_t tpos = calc_text_pos(t - (float)i * 0.015);

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

167 }

168 glDepthMask(1);

169 }

170 }

171

172 static void draw_tunnel(float t)

173 {

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

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

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

177 float du, dv;

178

179 prog = use_bump ? prog_tunnel : prog_simple;

180

181 bind_program(prog);

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

183

184 if(use_bump) {

185 vec3_t ltpos = calc_text_pos(t);

186

187 bind_texture(tex_normal, 1);

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

189 bind_texture(tex_stones, 0);

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

191

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

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

194 } else {

195 bind_texture(tex, 0);

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

197 }

198

199 gl_matrix_mode(GL_TEXTURE);

200 gl_load_identity();

201 gl_translatef(0, -t * tunnel_speed, 0);

202

203 gl_begin(GL_QUADS);

204 gl_color3f(1.0, 1.0, 1.0);

205

206 du = 1.0 / sides;

207 dv = 1.0 / segm;

208

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

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

211

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

213 float z0 = ring_height * i;

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

215

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

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

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

219

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

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

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

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

224

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

226 }

227 }

228 }

229 gl_end();

230

231 bind_texture(0, 1);

232 bind_texture(0, 0);

233 }

234

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

236 {

237 vec3_t pos, norm;

238 vec3_t dfdu, dfdv, pos_du, pos_dv;

239

240 float theta = 2.0 * M_PI * u;

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

242

243 float x = cos(theta);

244 float y = sin(theta);

245 float x1 = cos(theta1);

246 float y1 = sin(theta1);

247 float z = v / dv * ring_height;

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

249

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

251

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

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

254

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

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

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

258

259 dfdu = v3_sub(pos_du, pos);

260 dfdv = v3_sub(pos_dv, pos);

261 norm = v3_cross(dfdv, dfdu);

262

263 gl_vertex_attrib3f(tang_loc, dfdu.x, dfdu.y, dfdu.z);

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

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

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

267 }

268

269 static vec3_t calc_text_pos(float sec)

270 {

271 float t = text_speed * sec;

272 float z = fmod(t, text_period);

273 float pan[2];

274

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

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

277 }

278

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

280 {

281 gl_matrix_mode(GL_MODELVIEW);

282 gl_push_matrix();

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

284

285 glEnable(GL_BLEND);

286 glBlendFunc(GL_SRC_ALPHA, GL_ONE);

287

288 bind_program(prog_text);

289 set_uniform_float(prog, "idx", idx);

290

291 bind_texture(tex_text, 0);

292

293 gl_begin(GL_QUADS);

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

295

296 gl_texcoord2f(0, 1);

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

298

299 gl_texcoord2f(1, 1);

300 gl_vertex3f(1, -0.2, 0);

301

302 gl_texcoord2f(1, 0);

303 gl_vertex3f(1, 0.2, 0);

304

305 gl_texcoord2f(0, 0);

306 gl_vertex3f(-1, 0.2, 0);

307 gl_end();

308

309 bind_texture(0, 0);

310 glDisable(GL_BLEND);

311

312 gl_pop_matrix();

313 }

314

315

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

317 {

318 float x, y;

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

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

321

322 *tx = x * 0.5;

323 *ty = y * 0.5;

324 }

325

326

327 void reshape(int x, int y)

328 {

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

330

331 gl_matrix_mode(GL_PROJECTION);

332 gl_load_identity();

333 glu_perspective(40.0, (float)x / (float)y, 0.5, 500.0);

334

335 view_xsz = x;

336 view_ysz = y;

337 }

338

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

340 {

341 unsigned int prog, vs, ps;

342

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

344 return 0;

345 }

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

347 return 0;

348 }

349

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

351 return 0;

352 }

353 return prog;

354 }

355

356

357 #ifdef IPHONE

358 #include <QuartzCore/QuartzCore.h>

359

360 static float get_sec(void)

361 {

362 static float first;

363 static int init;

364

365 if(!init) {

366 init = 1;

367 first = CACurrentMediaTime();

368 return 0.0f;

369 }

370 return CACurrentMediaTime() - first;

371 }

372

373 #else

374

375 static float get_sec(void)

376 {

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

378 }

379 #endif