rayfract: bf1d56975cc9 src/rayfract.cc

rayfract

view src/rayfract.cc @ 3:bf1d56975cc9

- added visual studio project - removed vmath dependency

author	John Tsiombikas <nuclear@member.fsf.org>
date	Tue, 26 Oct 2010 09:52:57 +0300
parents	03022062c464
children	e4349f5804b9

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <math.h>

4 #include <assert.h>

5 #include <GL/glew.h>

6 #include <GL/glut.h>

7 #include "sdr.h"

8 #include "gui.h"

9 #include "vmath.h"

11 void disp();

12 void reshape(int x, int y);

13 void keyb(unsigned char key, int x, int y);

14 void keyb_up(unsigned char key, int x, int y);

15 void mouse(int bn, int state, int x, int y);

16 void motion(int x, int y);

17 void passive_motion(int x, int y);

19 int load_shader();

20 unsigned int create_ray_texture(int xsz, int ysz, float vfov, Vector2 *tex_scale = 0);

21 static Vector3 get_primary_ray_dir(int x, int y, int w, int h, float vfov_deg);

22 static int round_pow2(int x);

24 float cam_theta = 0, cam_phi = 0, cam_dist = 4.0;

25 float cam_y = 0;

27 unsigned int sdr;

28 unsigned int ray_tex;

29 Vector2 tex_scale;

30 Vector4 seed;

31 float err_thres = 0.0075;

32 int iter = 10;

33 float reflectivity = 0.2;

34 Vector3 color(0.9, 0.95, 1.0);

36 int main(int argc, char **argv)

37 {

38 int xsz, ysz;

40 seed = Vector4(0.4, 0.0, 0.0, -0.8);

42 glutInitWindowSize(640, 480);

43 glutInit(&argc, argv);

44 glutInitDisplayMode(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE);

45 glutCreateWindow("Raytraced Fractals");

46 xsz = glutGet(GLUT_WINDOW_WIDTH);

47 ysz = glutGet(GLUT_WINDOW_HEIGHT);

49 glutDisplayFunc(disp);

50 glutReshapeFunc(reshape);

51 glutKeyboardFunc(keyb);

52 glutKeyboardUpFunc(keyb_up);

53 glutMouseFunc(mouse);

54 glutMotionFunc(motion);

55 glutPassiveMotionFunc(passive_motion);

57 glEnable(GL_DEPTH_TEST);

58 glEnable(GL_LIGHTING);

59 glEnable(GL_LIGHT0);

60 glEnable(GL_CULL_FACE);

62 glewInit();

64 if(load_shader() == -1) {

65 return 1;

66 }

68 if(gui_init(xsz, ysz) == -1) {

69 return 1;

70 }

72 glutMainLoop();

73 return 0;

74 }

76 int load_shader()

77 {

78 if(sdr) {

79 free_program(sdr);

80 }

82 if(!(sdr = create_program_load("sdr/sdr.v.glsl", "sdr/julia.p.glsl"))) {

83 return -1;

84 }

85 set_uniform_float4(sdr, "seed", seed.x, seed.y, seed.z, seed.w);

86 set_uniform_float(sdr, "err_thres", err_thres);

87 set_uniform_int(sdr, "iter", iter);

88 set_uniform_float(sdr, "reflectivity", reflectivity);

89 set_uniform_float3(sdr, "diffuse_color", color.x, color.y, color.z);

91 return 0;

92 }

94 void disp()

95 {

96 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

98 glMatrixMode(GL_MODELVIEW);

99 glLoadIdentity();

100 glRotatef(cam_theta, 0, 1, 0);

101 glRotatef(cam_phi, 1, 0, 0);

102 glTranslatef(0, 0, -cam_dist);

103

104 float lpos[] = {-1, 1, 3, 0};

105 glLightfv(GL_LIGHT0, GL_POSITION, lpos);

106

107

108 glMatrixMode(GL_TEXTURE);

109 glPushMatrix();

110 glScalef(tex_scale.x, tex_scale.y, 1.0);

111

112 glBindTexture(GL_TEXTURE_2D, ray_tex);

113 glEnable(GL_TEXTURE_2D);

114 bind_program(sdr);

115

116 glBegin(GL_QUADS);

117 glColor3f(1, 1, 1);

118 glTexCoord2f(0, 1); glVertex2f(-1, -1);

119 glTexCoord2f(1, 1); glVertex2f(1, -1);

120 glTexCoord2f(1, 0); glVertex2f(1, 1);

121 glTexCoord2f(0, 0); glVertex2f(-1, 1);

122 glEnd();

123

124 bind_program(0);

125 glDisable(GL_TEXTURE_2D);

126

127 glMatrixMode(GL_TEXTURE);

128 glPopMatrix();

129

130 gui_draw();

131

132 glutSwapBuffers();

133 assert(glGetError() == GL_NO_ERROR);

134 }

135

136 void reshape(int x, int y)

137 {

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

139 glMatrixMode(GL_PROJECTION);

140 glLoadIdentity();

141 gluPerspective(45.0, (float)x / (float)y, 1.0, 1000.0);

142

143 if(ray_tex) {

144 glDeleteTextures(1, &ray_tex);

145 }

146 ray_tex = create_ray_texture(x, y, 50.0, &tex_scale);

147 }

148

149

150 void keyb(unsigned char key, int x, int y)

151 {

152 switch(key) {

153 case 27:

154 exit(0);

155

156 case '-':

157 if(iter > 1) {

158 iter--;

159 set_uniform_int(sdr, "iter", iter);

160 printf("iter: %d\n", iter);

161 glutPostRedisplay();

162 }

163 break;

164

165 case '=':

166 iter++;

167 set_uniform_int(sdr, "iter", iter);

168 printf("iter: %d\n", iter);

169 glutPostRedisplay();

170 break;

171

172 case ',':

173 err_thres -= 0.001;

174 set_uniform_float(sdr, "err_thres", err_thres);

175 printf("maximum error: %f\n", err_thres);

176 glutPostRedisplay();

177 break;

178

179 case '.':

180 err_thres += 0.001;

181 set_uniform_float(sdr, "err_thres", err_thres);

182 printf("maximum error: %f\n", err_thres);

183 glutPostRedisplay();

184 break;

185

186 case 's':

187 load_shader();

188 glutPostRedisplay();

189 break;

190

191 case 'r':

192 reflectivity = reflectivity > 0.0 ? 0.0 : 0.6;

193 set_uniform_float(sdr, "reflectivity", reflectivity);

194 glutPostRedisplay();

195 break;

196

197 case '`':

198 {

199 static bool vis = true;

200 vis = !vis;

201 gui_set_visible(vis);

202 glutPostRedisplay();

203 }

204 break;

205 }

206

207 utk::KeyboardEvent ev(key);

208 ev.pressed = true;

209 utk::event(&ev);

210 glutPostRedisplay();

211 }

212

213 void keyb_up(unsigned char key, int x, int y)

214 {

215 utk::KeyboardEvent ev(key);

216 ev.pressed = false;

217 utk::event(&ev);

218 glutPostRedisplay();

219 }

220

221 int bnstate[16];

222

223 int prev_x = -1, prev_y;

224 void mouse(int bn, int state, int x, int y)

225 {

226 utk::Container *utkroot = utk::get_root_widget();

227

228 if(utkroot->get_child_at(x, y) == utkroot) {

229 bnstate[bn] = state == GLUT_DOWN ? 1 : 0;

230 if(state == GLUT_DOWN) {

231 if(bn == 3) {

232 cam_dist -= 0.1;

233 glutPostRedisplay();

234 if(cam_dist < 0) cam_dist = 0;

235 } else if(bn == 4) {

236 cam_dist += 0.1;

237 glutPostRedisplay();

238 } else {

239 prev_x = x;

240 prev_y = y;

241 }

242 } else {

243 prev_x = -1;

244 }

245 }

246

247 utk::MButtonEvent ev(bn, x, y);

248 ev.pressed = state == GLUT_DOWN;

249 utk::event(&ev);

250 glutPostRedisplay();

251 }

252

253 void motion(int x, int y)

254 {

255 if(bnstate[0]) {

256 cam_theta += (x - prev_x) * 0.5;

257 cam_phi += (y - prev_y) * 0.5;

258

259 if(cam_phi < -90) cam_phi = -90;

260 if(cam_phi > 90) cam_phi = 90;

261

262 glutPostRedisplay();

263 }

264

265 if(bnstate[1]) {

266 cam_y += (y - prev_y) * 0.1;

267 glutPostRedisplay();

268 }

269

270 if(bnstate[2]) {

271 cam_dist += (y - prev_y) * 0.1;

272 glutPostRedisplay();

273 }

274

275 prev_x = x;

276 prev_y = y;

277

278 utk::MMotionEvent ev(x, y);

279 utk::event(&ev);

280 glutPostRedisplay();

281 }

282

283 void passive_motion(int x, int y)

284 {

285 utk::MMotionEvent ev(x, y);

286 utk::event(&ev);

287 //glutPostRedisplay();

288 }

289

290 unsigned int create_ray_texture(int xsz, int ysz, float vfov, Vector2 *tex_scale)

291 {

292 unsigned int tex;

293 int tex_xsz = round_pow2(xsz);

294 int tex_ysz = round_pow2(ysz);

295 float *teximg, *dir;

296

297 teximg = new float[3 * tex_xsz * tex_ysz];

298 dir = teximg;

299

300 for(int i=0; i<tex_ysz; i++) {

301 for(int j=0; j<tex_xsz; j++) {

302 if(j < xsz && i < ysz) {

303 Vector3 rdir = get_primary_ray_dir(j, i, xsz, ysz, vfov);

304 dir[0] = rdir.x;

305 dir[1] = rdir.y;

306 dir[2] = rdir.z;

307 } else {

308 dir[0] = dir[1] = 0.0f;

309 dir[2] = 1.0f;

310 }

311

312 dir += 3;

313 }

314 }

315

316 glGenTextures(1, &tex);

317 glBindTexture(GL_TEXTURE_2D, tex);

318 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

319 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

320 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);

321 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);

322 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32F_ARB, tex_xsz, tex_ysz, 0, GL_RGB, GL_FLOAT, teximg);

323 delete [] teximg;

324

325 if(tex_scale) {

326 tex_scale->x = (float)xsz / (float)tex_xsz;

327 tex_scale->y = (float)ysz / (float)tex_ysz;

328 }

329 return tex;

330 }

331

332 static Vector3 get_primary_ray_dir(int x, int y, int w, int h, float vfov_deg)

333 {

334 float vfov = M_PI * vfov_deg / 180.0;

335 float aspect = (float)w / (float)h;

336

337 float ysz = 2.0;

338 float xsz = aspect * ysz;

339

340 float px = ((float)x / (float)w) * xsz - xsz / 2.0;

341 float py = 1.0 - ((float)y / (float)h) * ysz;

342 float pz = 1.0 / tan(0.5 * vfov);

343

344 float mag = sqrt(px * px + py * py + pz * pz);

345

346 return Vector3(px / mag, py / mag, pz / mag);

347 }

348

349 static int round_pow2(int x)

350 {

351 x--;

352 x = (x >> 1) | x;

353 x = (x >> 2) | x;

354 x = (x >> 4) | x;

355 x = (x >> 8) | x;

356 x = (x >> 16) | x;

357 return x + 1;

358 }