istereo: bc6db80aaa58 src/istereo.c

istereo

view src/istereo.c @ 32:bc6db80aaa58

stop the texture coordinates from growing to rediculous proportions

author	John Tsiombikas <nuclear@mutantstargoat.com>
date	Thu, 08 Sep 2011 21:22:44 +0300
parents	8dd271942543
children	33e9eedad390

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 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

104

105 if(stereo) {

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

107

108 /* right eye */

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

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

111

112 gl_matrix_mode(GL_PROJECTION);

113 gl_load_identity();

114 cam_stereo_proj_matrix(CAM_RIGHT);

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

116

117 gl_matrix_mode(GL_MODELVIEW);

118 gl_load_identity();

119 cam_stereo_view_matrix(CAM_RIGHT);

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

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

122

123 render(tsec);

124

125 /* left eye */

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

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

128

129 gl_matrix_mode(GL_PROJECTION);

130 gl_load_identity();

131 cam_stereo_proj_matrix(CAM_LEFT);

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

133

134 gl_matrix_mode(GL_MODELVIEW);

135 gl_load_identity();

136 cam_stereo_view_matrix(CAM_LEFT);

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

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

139

140 render(tsec);

141 } else {

142 gl_matrix_mode(GL_MODELVIEW);

143 gl_load_identity();

144 cam_view_matrix();

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

146

147 render(tsec);

148 }

149

150 assert(glGetError() == GL_NO_ERROR);

151 }

152

153 static void render(float t)

154 {

155 int i;

156 float text_line;

157

158 draw_tunnel(t);

159

160 if(use_bump) {

161 glDepthMask(0);

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

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

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

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

166 }

167 glDepthMask(1);

168 }

169 }

170

171 static void draw_tunnel(float t)

172 {

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

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

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

176 float du, dv;

177

178 prog = use_bump ? prog_tunnel : prog_simple;

179

180 bind_program(prog);

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

182

183 if(use_bump) {

184 vec3_t ltpos = calc_text_pos(t);

185

186 bind_texture(tex_normal, 1);

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

188 bind_texture(tex_stones, 0);

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

190

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

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

193 } else {

194 bind_texture(tex, 0);

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

196 }

197

198 gl_matrix_mode(GL_TEXTURE);

199 gl_load_identity();

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

201

202 gl_begin(GL_QUADS);

203 gl_color3f(1.0, 1.0, 1.0);

204

205 du = 1.0 / sides;

206 dv = 1.0 / segm;

207

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

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

210

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

212 float z0 = ring_height * i;

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

214

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

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

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

218

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

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

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

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

223

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

225 }

226 }

227 }

228 gl_end();

229

230 bind_texture(0, 1);

231 bind_texture(0, 0);

232 }

233

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

235 {

236 vec3_t pos, norm;

237 vec3_t dfdu, dfdv, pos_du, pos_dv;

238

239 float theta = 2.0 * M_PI * u;

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

241

242 float x = cos(theta);

243 float y = sin(theta);

244 float x1 = cos(theta1);

245 float y1 = sin(theta1);

246 float z = v / dv * ring_height;

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

248

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

250

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

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

253

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

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

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

257

258 dfdu = v3_sub(pos_du, pos);

259 dfdv = v3_sub(pos_dv, pos);

260 norm = v3_cross(dfdv, dfdu);

261

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

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

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

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

266 }

267

268 static vec3_t calc_text_pos(float sec)

269 {

270 float t = text_speed * sec;

271 float z = fmod(t, text_period);

272 float pan[2];

273

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

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

276 }

277

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

279 {

280 gl_matrix_mode(GL_MODELVIEW);

281 gl_push_matrix();

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

283

284 glEnable(GL_BLEND);

285 glBlendFunc(GL_SRC_ALPHA, GL_ONE);

286

287 bind_program(prog_text);

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

289

290 bind_texture(tex_text, 0);

291

292 gl_begin(GL_QUADS);

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

294

295 gl_texcoord2f(0, 1);

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

297

298 gl_texcoord2f(1, 1);

299 gl_vertex3f(1, -0.2, 0);

300

301 gl_texcoord2f(1, 0);

302 gl_vertex3f(1, 0.2, 0);

303

304 gl_texcoord2f(0, 0);

305 gl_vertex3f(-1, 0.2, 0);

306 gl_end();

307

308 bind_texture(0, 0);

309 glDisable(GL_BLEND);

310

311 gl_pop_matrix();

312 }

313

314

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

316 {

317 float x, y;

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

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

320

321 *tx = x * 0.5;

322 *ty = y * 0.5;

323 }

324

325

326 void reshape(int x, int y)

327 {

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

329

330 gl_matrix_mode(GL_PROJECTION);

331 gl_load_identity();

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

333

334 view_xsz = x;

335 view_ysz = y;

336 }

337

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

339 {

340 unsigned int prog, vs, ps;

341

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

343 return 0;

344 }

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

346 return 0;

347 }

348

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

350 return 0;

351 }

352 return prog;

353 }

354

355

356 #ifdef IPHONE

357 #include <QuartzCore/QuartzCore.h>

358

359 static float get_sec(void)

360 {

361 static float first;

362 static int init;

363

364 if(!init) {

365 init = 1;

366 first = CACurrentMediaTime();

367 return 0.0f;

368 }

369 return CACurrentMediaTime() - first;

370 }

371

372 #else

373

374 static float get_sec(void)

375 {

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

377 }

378 #endif