istereo: fd39c0198935 src/istereo.c

istereo

view src/istereo.c @ 27:fd39c0198935

normal mapped tunnel

author	John Tsiombikas <nuclear@mutantstargoat.com>
date	Thu, 08 Sep 2011 08:30:00 +0300
parents	862a3329a8f0
children	8dd271942543

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 = 1;

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 = 0.53;

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(45.0);

79 return 0;

80 }

82 void cleanup(void)

83 {

84 free_program(prog);

85 }

87 void redraw(void)

88 {

89 float pan_x, pan_y, z;

90 float tsec = get_sec();

92 z = ring_height * segm;

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

95 if(use_bump) {

96 glClearColor(0.01, 0.01, 0.01, 1.0);

97 tunnel_speed = 0.5;

98 } else {

99 glClearColor(0.6, 0.6, 0.6, 1.0);

100 tunnel_speed = 0.75;

101 }

102 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

103

104 if(stereo) {

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

106

107 /* right eye */

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

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

110

111 gl_matrix_mode(GL_PROJECTION);

112 gl_load_identity();

113 cam_stereo_proj_matrix(CAM_RIGHT);

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

115

116 gl_matrix_mode(GL_MODELVIEW);

117 gl_load_identity();

118 cam_stereo_view_matrix(CAM_RIGHT);

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

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

121

122 render(tsec);

123

124 /* left eye */

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

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

127

128 gl_matrix_mode(GL_PROJECTION);

129 gl_load_identity();

130 cam_stereo_proj_matrix(CAM_LEFT);

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

132

133 gl_matrix_mode(GL_MODELVIEW);

134 gl_load_identity();

135 cam_stereo_view_matrix(CAM_LEFT);

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

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

138

139 render(tsec);

140 } else {

141 gl_matrix_mode(GL_MODELVIEW);

142 gl_load_identity();

143 cam_view_matrix();

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

145

146 render(tsec);

147 }

148

149 assert(glGetError() == GL_NO_ERROR);

150 }

151

152 static void render(float t)

153 {

154 int i;

155 float text_line;

156

157 draw_tunnel(t);

158

159 glDepthMask(0);

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

161 for(i=0; i<15; i++) {

162 vec3_t tpos = calc_text_pos(t - (float)i * 0.01);

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

164 }

165 glDepthMask(1);

166 }

167

168 static void draw_tunnel(float t)

169 {

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

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

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

173 float du, dv;

174

175 prog = use_bump ? prog_tunnel : prog_simple;

176

177 bind_program(prog);

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

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

180

181 if(use_bump) {

182 vec3_t ltpos = calc_text_pos(t);

183

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

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

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

187 bind_texture(tex_normal, 1);

188 }

189

190 bind_texture(tex, 0);

191

192 gl_matrix_mode(GL_TEXTURE);

193 gl_load_identity();

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

195

196 gl_begin(GL_QUADS);

197 gl_color3f(1.0, 1.0, 1.0);

198

199 du = 1.0 / sides;

200 dv = 1.0 / segm;

201

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

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

204

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

206 float z0 = ring_height * i;

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

208

209 float v0 = (float)i / (float)segm;

210 float v1 = (float)(i + 1) / (float)segm;

211

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

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

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

215

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

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

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

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

220

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

222 }

223 }

224 }

225 gl_end();

226

227 bind_texture(0, 1);

228 bind_texture(0, 0);

229 }

230

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

232 {

233 vec3_t pos, norm;

234 vec3_t dfdu, dfdv, pos_du, pos_dv;

235

236 float theta = 2.0 * M_PI * u;

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

238

239 float x = cos(theta);

240 float y = sin(theta);

241 float x1 = cos(theta1);

242 float y1 = sin(theta1);

243 float z = v / dv * ring_height;

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

245

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

247

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

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

250

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

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

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

254

255 dfdu = v3_sub(pos_du, pos);

256 dfdv = v3_sub(pos_dv, pos);

257 norm = v3_cross(dfdv, dfdu);

258

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

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

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

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

263 }

264

265 static vec3_t calc_text_pos(float sec)

266 {

267 float t = text_speed * sec;

268 float z = fmod(t, text_period);

269 float pan[2];

270

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

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

273 }

274

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

276 {

277 gl_matrix_mode(GL_MODELVIEW);

278 gl_push_matrix();

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

280

281 glEnable(GL_BLEND);

282 glBlendFunc(GL_SRC_ALPHA, GL_ONE);

283

284 bind_program(prog_text);

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

286

287 bind_texture(tex_text, 0);

288

289 gl_begin(GL_QUADS);

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

291

292 gl_texcoord2f(0, 1);

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

294

295 gl_texcoord2f(1, 1);

296 gl_vertex3f(1, -0.2, 0);

297

298 gl_texcoord2f(1, 0);

299 gl_vertex3f(1, 0.2, 0);

300

301 gl_texcoord2f(0, 0);

302 gl_vertex3f(-1, 0.2, 0);

303 gl_end();

304

305 bind_texture(0, 0);

306 glDisable(GL_BLEND);

307

308 gl_pop_matrix();

309 }

310

311

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

313 {

314 float x, y;

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

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

317

318 *tx = x * 0.5;

319 *ty = y * 0.5;

320 }

321

322

323 void reshape(int x, int y)

324 {

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

326

327 gl_matrix_mode(GL_PROJECTION);

328 gl_load_identity();

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

330

331 view_xsz = x;

332 view_ysz = y;

333 }

334

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

336 {

337 unsigned int prog, vs, ps;

338

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

340 return 0;

341 }

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

343 return 0;

344 }

345

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

347 return 0;

348 }

349 return prog;

350 }

351

352

353 #ifdef IPHONE

354 #include <QuartzCore/QuartzCore.h>

355

356 static float get_sec(void)

357 {

358 static float first;

359 static int init;

360

361 if(!init) {

362 init = 1;

363 first = CACurrentMediaTime();

364 return 0.0f;

365 }

366 return CACurrentMediaTime() - first;

367 }

368

369 #else

370

371 static float get_sec(void)

372 {

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

374 }

375 #endif