istereo: e60f9d8af28d src/istereo.c

istereo

view src/istereo.c @ 37:e60f9d8af28d

fixed the orientation of the tunnel when in non-stereo mode

author	John Tsiombikas <nuclear@mutantstargoat.com>
date	Fri, 09 Sep 2011 23:37:38 +0300
parents	834503dcb486
children	ff055bff6a15

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 int stereo = 0;

30 int use_bump = 0;

32 /* construction parameters */

33 int sides = 24;

34 int segm = 20;

35 float tunnel_speed = 0.75;

36 float ring_height = 0.5;

37 float text_period = 13.0;

38 float text_speed = 2.2;

40 float split = 0.5275;

42 int init(void)

43 {

44 add_resource_path("sdr");

45 add_resource_path("data");

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

48 return -1;

49 }

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

51 return -1;

52 }

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

54 return -1;

55 }

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

58 return -1;

59 }

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

61 return -1;

62 }

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

64 return -1;

65 }

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

67 return -1;

68 }

70 glEnable(GL_DEPTH_TEST);

71 glEnable(GL_CULL_FACE);

73 cam_fov(42.5);

74 cam_clip(0.5, 250.0);

76 return 0;

77 }

79 void cleanup(void)

80 {

81 free_program(prog);

82 }

84 void redraw(void)

85 {

86 float pan_x, pan_y, z;

87 float tsec = get_sec();

89 z = ring_height * segm;

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

92 if(use_bump) {

93 glClearColor(0.01, 0.01, 0.01, 1.0);

94 tunnel_speed = 0.5;

95 } else {

96 glClearColor(0.6, 0.6, 0.6, 1.0);

97 tunnel_speed = 0.75;

98 }

99 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

100

101 if(stereo) {

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

103

104 /* right eye */

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

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

107

108 gl_matrix_mode(GL_PROJECTION);

109 gl_load_identity();

110 cam_stereo_proj_matrix(CAM_RIGHT);

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

112

113 gl_matrix_mode(GL_MODELVIEW);

114 gl_load_identity();

115 cam_stereo_view_matrix(CAM_RIGHT);

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

117

118 render(tsec);

119

120 /* left eye */

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

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

123

124 gl_matrix_mode(GL_PROJECTION);

125 gl_load_identity();

126 cam_stereo_proj_matrix(CAM_LEFT);

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

128

129 gl_matrix_mode(GL_MODELVIEW);

130 gl_load_identity();

131 cam_stereo_view_matrix(CAM_LEFT);

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

133

134 render(tsec);

135 } else {

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

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

138

139 gl_matrix_mode(GL_PROJECTION);

140 gl_load_identity();

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

142 cam_proj_matrix();

143

144 gl_matrix_mode(GL_MODELVIEW);

145 gl_load_identity();

146 cam_view_matrix();

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

148

149 render(tsec);

150 }

151

152 assert(glGetError() == GL_NO_ERROR);

153 }

154

155 static void render(float t)

156 {

157 int i;

158 float text_line;

159

160 draw_tunnel(t);

161

162 if(use_bump) {

163 glDepthMask(0);

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

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

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

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

168 }

169 glDepthMask(1);

170 }

171 }

172

173 static void draw_tunnel(float t)

174 {

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

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

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

178 float du, dv;

179

180 prog = use_bump ? prog_tunnel : prog_simple;

181

182 bind_program(prog);

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

184

185 if(use_bump) {

186 vec3_t ltpos = calc_text_pos(t);

187

188 bind_texture(tex_normal, 1);

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

190 bind_texture(tex_stones, 0);

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

192

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

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

195 } else {

196 bind_texture(tex, 0);

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

198 }

199

200 gl_matrix_mode(GL_TEXTURE);

201 gl_load_identity();

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

203

204 gl_begin(GL_QUADS);

205 gl_color3f(1.0, 1.0, 1.0);

206

207 du = 1.0 / sides;

208 dv = 1.0 / segm;

209

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

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

212

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

214 float z0 = ring_height * i;

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

216

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

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

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

220

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

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

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

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

225

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

227 }

228 }

229 }

230 gl_end();

231

232 bind_texture(0, 1);

233 bind_texture(0, 0);

234 }

235

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

237 {

238 vec3_t pos, norm;

239 vec3_t dfdu, dfdv, pos_du, pos_dv;

240

241 float theta = 2.0 * M_PI * u;

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

243

244 float x = cos(theta);

245 float y = sin(theta);

246 float x1 = cos(theta1);

247 float y1 = sin(theta1);

248 float z = v / dv * ring_height;

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

250

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

252

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

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

255

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

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

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

259

260 dfdu = v3_sub(pos_du, pos);

261 dfdv = v3_sub(pos_dv, pos);

262 norm = v3_cross(dfdv, dfdu);

263

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

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

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

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

268 }

269

270 static vec3_t calc_text_pos(float sec)

271 {

272 float t = text_speed * sec;

273 float z = fmod(t, text_period);

274 float pan[2];

275

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

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

278 }

279

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

281 {

282 gl_matrix_mode(GL_MODELVIEW);

283 gl_push_matrix();

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

285

286 glEnable(GL_BLEND);

287 glBlendFunc(GL_SRC_ALPHA, GL_ONE);

288

289 bind_program(prog_text);

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

291

292 bind_texture(tex_text, 0);

293

294 gl_begin(GL_QUADS);

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

296

297 gl_texcoord2f(0, 1);

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

299

300 gl_texcoord2f(1, 1);

301 gl_vertex3f(1, -0.2, 0);

302

303 gl_texcoord2f(1, 0);

304 gl_vertex3f(1, 0.2, 0);

305

306 gl_texcoord2f(0, 0);

307 gl_vertex3f(-1, 0.2, 0);

308 gl_end();

309

310 bind_texture(0, 0);

311 glDisable(GL_BLEND);

312

313 gl_pop_matrix();

314 }

315

316

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

318 {

319 float x, y;

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

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

322

323 *tx = x * 0.5;

324 *ty = y * 0.5;

325 }

326

327

328 void reshape(int x, int y)

329 {

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

331

332 gl_matrix_mode(GL_PROJECTION);

333 gl_load_identity();

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

335

336 view_xsz = x;

337 view_ysz = y;

338 }

339

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

341 {

342 unsigned int prog, vs, ps;

343

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

345 return 0;

346 }

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

348 return 0;

349 }

350

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

352 return 0;

353 }

354 return prog;

355 }

356

357

358 #ifdef IPHONE

359 #include <QuartzCore/QuartzCore.h>

360

361 static float get_sec(void)

362 {

363 static float first;

364 static int init;

365

366 if(!init) {

367 init = 1;

368 first = CACurrentMediaTime();

369 return 0.0f;

370 }

371 return CACurrentMediaTime() - first;

372 }

373

374 #else

375

376 static float get_sec(void)

377 {

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

379 }

380 #endif