erebus

annotate liberebus/src/erebus.cc @ 32:b1fc96c71bcc

find changesets by author, revision, files, or words in the commit message
- lambert BRDF importance sampling - UI + commandline arguments - font rendering for showing status/progress
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 07 Jun 2014 13:36:36 +0300
parents 53a98c148bf8
children d15ee526daa6
rev   line source
nuclear@2 1 #include <string.h>
nuclear@2 2 #include <limits.h>
nuclear@27 3 #include <algorithm>
nuclear@2 4 #include <chrono>
nuclear@2 5 #include <random>
nuclear@2 6 #include "erebus.h"
nuclear@17 7 #include "erebus_impl.h"
nuclear@4 8 #include "scene.h"
nuclear@4 9 #include "geomobj.h"
nuclear@5 10 #include "rt.h"
nuclear@2 11
nuclear@8 12 #define INF_SAMPLES (INT_MAX / 2)
nuclear@8 13
nuclear@2 14 using namespace std::chrono;
nuclear@2 15
nuclear@26 16 static void render_block(struct erebus *ctx, Block blk);
nuclear@8 17 static void render_pixel(struct erebus *ctx, int x, int y, int sample);
nuclear@2 18
nuclear@2 19 static std::mt19937 rnd_gen;
nuclear@2 20
nuclear@2 21 extern "C" {
nuclear@2 22
nuclear@2 23 struct erebus *erb_init(void)
nuclear@2 24 {
nuclear@31 25 struct erebus *ctx = 0;
nuclear@2 26 try {
nuclear@2 27 ctx = new struct erebus;
nuclear@2 28 }
nuclear@2 29 catch(...) {
nuclear@2 30 return 0;
nuclear@2 31 }
nuclear@2 32
nuclear@10 33 rnd_gen.seed(time(0));
nuclear@10 34
nuclear@4 35 ctx->scn = 0;
nuclear@2 36 ctx->cur_time = 0;
nuclear@26 37 ctx->cur_frame = 0;
nuclear@32 38 ctx->tpool = 0;
nuclear@8 39
nuclear@17 40 erb_setoptf(ctx, ERB_OPT_GAMMA, 2.2);
nuclear@17 41 erb_setopti(ctx, ERB_OPT_MAX_ITER, 6);
nuclear@17 42 erb_setopti(ctx, ERB_OPT_MAX_SAMPLES, INF_SAMPLES);
nuclear@17 43 erb_setopti(ctx, ERB_OPT_NUM_THREADS, -1);
nuclear@15 44
nuclear@15 45 ctx->dbg_nodesel = -1;
nuclear@2 46 return ctx;
nuclear@2 47 }
nuclear@2 48
nuclear@2 49 void erb_destroy(struct erebus *ctx)
nuclear@2 50 {
nuclear@31 51 if(ctx) {
nuclear@31 52 // make sure the threadpool stops BEFORE destroying the framebuffers etc in ctx
nuclear@31 53 delete ctx->tpool;
nuclear@31 54 delete ctx;
nuclear@31 55 }
nuclear@2 56 }
nuclear@2 57
nuclear@2 58 void erb_setopti(struct erebus *ctx, enum erb_option opt, int val)
nuclear@2 59 {
nuclear@17 60 ctx->options[opt].ival = val;
nuclear@17 61 ctx->options[opt].type = Option::Type::INT;
nuclear@2 62 }
nuclear@17 63
nuclear@2 64 void erb_setoptf(struct erebus *ctx, enum erb_option opt, float val)
nuclear@2 65 {
nuclear@17 66 ctx->options[opt].fval = val;
nuclear@17 67 ctx->options[opt].type = Option::Type::FLOAT;
nuclear@2 68 }
nuclear@17 69
nuclear@2 70 void erb_setoptfv(struct erebus *ctx, enum erb_option opt, float *vec)
nuclear@2 71 {
nuclear@2 72 for(int i=0; i<4; i++) {
nuclear@17 73 ctx->options[opt].vval[i] = vec[i];
nuclear@2 74 }
nuclear@17 75 ctx->options[opt].type = Option::Type::VEC;
nuclear@2 76 }
nuclear@2 77
nuclear@2 78 int erb_getopti(struct erebus *ctx, enum erb_option opt)
nuclear@2 79 {
nuclear@17 80 switch(ctx->options[opt].type) {
nuclear@17 81 case Option::Type::INT:
nuclear@17 82 return ctx->options[opt].ival;
nuclear@17 83 case Option::Type::FLOAT:
nuclear@17 84 return (int)ctx->options[opt].fval;
nuclear@17 85 case Option::Type::VEC:
nuclear@17 86 return (int)ctx->options[opt].vval.x;
nuclear@17 87 }
nuclear@17 88 return 0; // can't happen
nuclear@2 89 }
nuclear@17 90
nuclear@2 91 float erb_getoptf(struct erebus *ctx, enum erb_option opt)
nuclear@2 92 {
nuclear@17 93 switch(ctx->options[opt].type) {
nuclear@17 94 case Option::Type::INT:
nuclear@17 95 return (float)ctx->options[opt].ival;
nuclear@17 96 case Option::Type::FLOAT:
nuclear@17 97 return ctx->options[opt].fval;
nuclear@17 98 case Option::Type::VEC:
nuclear@17 99 return ctx->options[opt].vval.x;
nuclear@17 100 }
nuclear@17 101 return 0.0f; // can't happen
nuclear@2 102 }
nuclear@17 103
nuclear@2 104 float *erb_getoptfv(struct erebus *ctx, enum erb_option opt)
nuclear@2 105 {
nuclear@17 106 switch(ctx->options[opt].type) {
nuclear@17 107 case Option::Type::INT:
nuclear@17 108 {
nuclear@17 109 int ival = ctx->options[opt].ival;
nuclear@17 110 ctx->options[opt].vval = Vector4(ival, ival, ival, ival);
nuclear@17 111 }
nuclear@17 112 break;
nuclear@17 113 case Option::Type::FLOAT:
nuclear@17 114 {
nuclear@17 115 float fval = ctx->options[opt].fval;
nuclear@17 116 ctx->options[opt].vval = Vector4(fval, fval, fval, fval);
nuclear@17 117 }
nuclear@17 118 default:
nuclear@17 119 break;
nuclear@17 120 }
nuclear@17 121
nuclear@17 122 return &ctx->options[opt].vval.x;
nuclear@2 123 }
nuclear@2 124
nuclear@2 125 float *erb_get_framebuffer(struct erebus *ctx)
nuclear@2 126 {
nuclear@2 127 return ctx->fbimg.get_pixels();
nuclear@2 128 }
nuclear@2 129
nuclear@2 130 void erb_begin_frame(struct erebus *ctx, long ms)
nuclear@2 131 {
nuclear@32 132 if(!ctx->tpool) {
nuclear@32 133 int num_threads = erb_getopti(ctx, ERB_OPT_NUM_THREADS);
nuclear@32 134 ctx->tpool = new ThreadPool(num_threads);
nuclear@32 135 }
nuclear@32 136
nuclear@26 137 ++ctx->cur_frame;
nuclear@26 138 ctx->cur_sample = 0;
nuclear@2 139 ctx->cur_time = ms;
nuclear@4 140
nuclear@17 141 int xsz = erb_getopti(ctx, ERB_OPT_WIDTH);
nuclear@17 142 int ysz = erb_getopti(ctx, ERB_OPT_HEIGHT);
nuclear@4 143
nuclear@26 144 if(!ctx->fbimg.get_pixels() || ctx->fbimg.get_width() != xsz || ctx->fbimg.get_height() < ysz) {
nuclear@26 145 ctx->fbimg.create(xsz, ysz);
nuclear@26 146 ctx->accum.create(xsz, ysz);
nuclear@26 147 } else {
nuclear@26 148 ctx->fbimg.clear();
nuclear@26 149 ctx->accum.clear();
nuclear@26 150 }
nuclear@15 151
nuclear@17 152 ctx->inv_gamma = 1.0f / erb_getoptf(ctx, ERB_OPT_GAMMA);
nuclear@26 153
nuclear@26 154 ctx->scn->update(ctx->cur_time);
nuclear@2 155 }
nuclear@2 156
nuclear@2 157 int erb_render(struct erebus *ctx, long timeout)
nuclear@2 158 {
nuclear@2 159 return erb_render_rect(ctx, 0, 0, ctx->fbimg.get_width(), ctx->fbimg.get_height(), timeout);
nuclear@2 160 }
nuclear@2 161
nuclear@26 162 #define BLKSZ 32
nuclear@26 163
nuclear@2 164 int erb_render_rect(struct erebus *ctx, int x, int y, int width, int height, long timeout)
nuclear@2 165 {
nuclear@31 166 while(ctx->tpool->pending()) {
nuclear@26 167 if(timeout > 0) {
nuclear@31 168 long wait_interval = ctx->tpool->wait(timeout);
nuclear@26 169 timeout -= wait_interval;
nuclear@26 170 } else {
nuclear@26 171 return 1;
nuclear@26 172 }
nuclear@26 173 }
nuclear@26 174
nuclear@2 175 if(!width || !height) return -1;
nuclear@2 176
nuclear@26 177 int startx = x;
nuclear@26 178 int endx = x + width;
nuclear@26 179 int endy = y + height;
nuclear@26 180
nuclear@26 181 while(y < endy) {
nuclear@26 182 x = startx;
nuclear@26 183 while(x < endx) {
nuclear@26 184 Block blk;
nuclear@26 185 blk.x = x;
nuclear@26 186 blk.y = y;
nuclear@26 187 blk.width = std::min(BLKSZ, endx - x);
nuclear@26 188 blk.height = std::min(BLKSZ, endy - y);
nuclear@26 189 blk.sample = ctx->cur_sample;
nuclear@26 190 blk.frame = ctx->cur_frame;
nuclear@26 191
nuclear@31 192 ctx->tpool->add_work(std::bind(render_block, ctx, blk));
nuclear@26 193
nuclear@26 194 x += BLKSZ;
nuclear@26 195 }
nuclear@26 196 y += BLKSZ;
nuclear@2 197 }
nuclear@2 198
nuclear@26 199 ++ctx->cur_sample;
nuclear@31 200 ctx->tpool->wait(timeout); // wait for completion
nuclear@26 201 return ctx->cur_sample > erb_getopti(ctx, ERB_OPT_MAX_SAMPLES) ? 0 : 1;
nuclear@26 202 }
nuclear@4 203
nuclear@2 204
nuclear@2 205 int erb_get_progress(struct erebus *ctx)
nuclear@2 206 {
nuclear@32 207 struct erb_render_status st;
nuclear@32 208 if(erb_get_status(ctx, &st) == -1) {
nuclear@32 209 return 0;
nuclear@32 210 }
nuclear@32 211 return st.progress_percent;
nuclear@32 212 }
nuclear@32 213
nuclear@32 214 int erb_get_status(struct erebus *ctx, struct erb_render_status *stat)
nuclear@32 215 {
nuclear@32 216 long pending = ctx->tpool->pending();
nuclear@32 217 if(!pending) {
nuclear@32 218 return -1;
nuclear@32 219 }
nuclear@32 220 int xsz = ctx->fbimg.get_width();
nuclear@32 221 int ysz = ctx->fbimg.get_height();
nuclear@32 222 int xblocks = (xsz + BLKSZ - 1) / BLKSZ;
nuclear@32 223 int yblocks = (ysz + BLKSZ - 1) / BLKSZ;
nuclear@32 224 long num_blocks = xblocks * yblocks;
nuclear@32 225
nuclear@32 226 stat->frames = stat->max_frames = 0; // TODO
nuclear@32 227
nuclear@32 228 stat->blocks = num_blocks - pending;
nuclear@32 229 stat->max_blocks = num_blocks;
nuclear@32 230
nuclear@32 231 stat->samples = ctx->cur_sample ? ctx->cur_sample - 1 : 0;
nuclear@32 232 if((stat->max_samples = erb_getopti(ctx, ERB_OPT_MAX_SAMPLES)) == INF_SAMPLES) {
nuclear@32 233 stat->max_samples = stat->samples;
nuclear@32 234
nuclear@32 235 stat->progress_percent = 100 * stat->blocks / stat->max_blocks;
nuclear@32 236 } else {
nuclear@32 237 stat->progress_percent = 100 * stat->samples / stat->max_samples;
nuclear@32 238 }
nuclear@32 239 return 0;
nuclear@2 240 }
nuclear@2 241
nuclear@2 242 int erb_load_scene(struct erebus *ctx, const char *fname)
nuclear@2 243 {
nuclear@4 244 delete ctx->scn;
nuclear@4 245 ctx->scn = new Scene;
nuclear@2 246
nuclear@19 247 if(!ctx->scn->load(fname)) {
nuclear@19 248 return -1;
nuclear@19 249 }
nuclear@4 250 return 0;
nuclear@2 251 }
nuclear@2 252
nuclear@9 253 bool erb_input_keyboard(struct erebus *ctx, int key, bool pressed)
nuclear@9 254 {
nuclear@9 255 if(!ctx) return false;
nuclear@15 256 if((int)ctx->keystate.size() <= key) {
nuclear@15 257 ctx->keystate.resize(key < 256 ? 256 : key + 1);
nuclear@15 258 }
nuclear@9 259
nuclear@9 260 ctx->keystate[key] = pressed;
nuclear@10 261
nuclear@10 262 if(pressed) {
nuclear@10 263 switch(key) {
nuclear@15 264 case '.':
nuclear@15 265 {
nuclear@15 266 int node_count = ctx->scn->get_node_count();
nuclear@15 267 if(node_count && ++ctx->dbg_nodesel >= node_count) {
nuclear@15 268 ctx->dbg_nodesel = 0;
nuclear@15 269 }
nuclear@15 270 printf("selected node: %d\n", ctx->dbg_nodesel);
nuclear@15 271 }
nuclear@15 272 break;
nuclear@15 273
nuclear@15 274 case ',':
nuclear@15 275 {
nuclear@15 276 int node_count = ctx->scn->get_node_count();
nuclear@15 277 if(node_count && --ctx->dbg_nodesel < 0) {
nuclear@15 278 ctx->dbg_nodesel = node_count - 1;
nuclear@15 279 }
nuclear@15 280 printf("selected node: %d\n", ctx->dbg_nodesel);
nuclear@15 281 }
nuclear@15 282 break;
nuclear@15 283
nuclear@10 284 case '=':
nuclear@10 285 case '-':
nuclear@15 286 case '0':
nuclear@15 287 if(ctx->dbg_nodesel != -1) {
nuclear@15 288 SceneNode *node = ctx->scn->get_node(ctx->dbg_nodesel);
nuclear@15 289 Vector3 s = node->get_scaling();
nuclear@15 290 switch(key) {
nuclear@15 291 case '=':
nuclear@15 292 node->set_scaling(s * 1.1);
nuclear@15 293 break;
nuclear@15 294 case '-':
nuclear@15 295 node->set_scaling(s * 0.9);
nuclear@15 296 break;
nuclear@15 297 case '0':
nuclear@15 298 node->set_scaling(Vector3(1, 1, 1));
nuclear@15 299 break;
nuclear@15 300 }
nuclear@15 301 }
nuclear@15 302 erb_begin_frame(ctx, 0);
nuclear@15 303 return true;
nuclear@10 304 }
nuclear@10 305 }
nuclear@9 306 return false;
nuclear@9 307 }
nuclear@9 308
nuclear@9 309 bool erb_input_mouse_button(struct erebus *ctx, int bn, bool pressed, int x, int y)
nuclear@9 310 {
nuclear@9 311 if(!ctx) return false;
nuclear@15 312 if((int)ctx->bnstate.size() <= bn) {
nuclear@15 313 ctx->bnstate.resize(bn < 32 ? 32 : bn + 1);
nuclear@15 314 }
nuclear@9 315
nuclear@9 316 ctx->bnstate[bn] = pressed;
nuclear@9 317 ctx->mouse_pos[0] = x;
nuclear@9 318 ctx->mouse_pos[1] = y;
nuclear@10 319 return false;
nuclear@9 320 }
nuclear@9 321
nuclear@10 322 bool erb_input_mouse_motion(struct erebus *ctx, int x, int y)
nuclear@10 323 {
nuclear@18 324 bool res = false;
nuclear@18 325
nuclear@18 326 if(!ctx) return res;
nuclear@18 327
nuclear@18 328 int dx = x - ctx->mouse_pos[0];
nuclear@18 329 int dy = y - ctx->mouse_pos[1];
nuclear@18 330
nuclear@18 331 if(dx || dy) {
nuclear@18 332 TargetCamera *cam = (TargetCamera*)ctx->scn->get_active_camera();
nuclear@18 333 if(cam && ctx->bnstate[0]) {
nuclear@18 334 Vector3 cpos = cam->get_position();
nuclear@18 335 float mag = cpos.length();
nuclear@18 336
nuclear@19 337 float theta = atan2(cpos.z / mag, cpos.x / mag) - DEG_TO_RAD(dx * 0.5);
nuclear@19 338 float phi = acos(cpos.y / mag) - DEG_TO_RAD(dy * 0.5);
nuclear@18 339
nuclear@18 340 if(phi < 0) phi = 0;
nuclear@18 341 if(phi > M_PI) phi = M_PI;
nuclear@18 342
nuclear@18 343 cpos.x = cos(theta) * sin(phi) * mag;
nuclear@18 344 cpos.y = cos(phi) * mag;
nuclear@18 345 cpos.z = sin(theta) * sin(phi) * mag;
nuclear@18 346 cam->set_position(cpos);
nuclear@18 347
nuclear@18 348 erb_begin_frame(ctx, 0);
nuclear@18 349 res = true;
nuclear@18 350 }
nuclear@18 351 }
nuclear@10 352
nuclear@10 353 ctx->mouse_pos[0] = x;
nuclear@10 354 ctx->mouse_pos[1] = y;
nuclear@18 355 return res;
nuclear@10 356 }
nuclear@10 357
nuclear@10 358 bool erb_input_6dof_button(struct erebus *ctx, int bn, bool pressed)
nuclear@10 359 {
nuclear@10 360 if(!ctx) return false;
nuclear@10 361 return false;
nuclear@10 362 }
nuclear@10 363
nuclear@10 364 bool erb_input_6dof_motion(struct erebus *ctx, float x, float y, float z)
nuclear@10 365 {
nuclear@10 366 if(!ctx) return false;
nuclear@10 367 return false;
nuclear@10 368 }
nuclear@9 369
nuclear@9 370
nuclear@2 371 } // extern "C"
nuclear@2 372
nuclear@2 373 float randf(float low, float high)
nuclear@2 374 {
nuclear@2 375 std::uniform_real_distribution<float> unirnd(low, high);
nuclear@2 376 return unirnd(rnd_gen);
nuclear@2 377 }
nuclear@2 378
nuclear@26 379 static void render_block(struct erebus *ctx, Block blk)
nuclear@26 380 {
nuclear@26 381 if(blk.frame < ctx->cur_frame) {
nuclear@26 382 return; // skip stale blocks
nuclear@26 383 }
nuclear@26 384
nuclear@26 385 for(int i=0; i<blk.height; i++) {
nuclear@26 386 for(int j=0; j<blk.width; j++) {
nuclear@26 387 render_pixel(ctx, blk.x + j, blk.y + i, blk.sample);
nuclear@26 388 }
nuclear@26 389 }
nuclear@26 390 }
nuclear@26 391
nuclear@8 392 static void render_pixel(struct erebus *ctx, int x, int y, int sample)
nuclear@2 393 {
nuclear@5 394 Camera *cam = ctx->scn->get_active_camera();
nuclear@5 395 if(!cam) return;
nuclear@5 396
nuclear@5 397 int xsz = ctx->fbimg.get_width();
nuclear@5 398 int ysz = ctx->fbimg.get_height();
nuclear@8 399 int offs = (y * xsz + x) * 4;
nuclear@5 400
nuclear@8 401 float *pix = ctx->fbimg.get_pixels() + offs;
nuclear@8 402 float *accum = ctx->accum.get_pixels() + offs;
nuclear@8 403
nuclear@8 404 Ray ray = cam->get_primary_ray(x, y, xsz, ysz, sample);
nuclear@17 405 Color c = ray_trace(ctx, ray, 0);
nuclear@8 406 accum[0] += c.x;
nuclear@8 407 accum[1] += c.y;
nuclear@8 408 accum[2] += c.z;
nuclear@8 409 accum[3] += c.w;
nuclear@8 410
nuclear@8 411 float inv_samples = 1.0f / (float)(sample + 1);
nuclear@17 412 pix[0] = pow(accum[0] * inv_samples, ctx->inv_gamma);
nuclear@17 413 pix[1] = pow(accum[1] * inv_samples, ctx->inv_gamma);
nuclear@17 414 pix[2] = pow(accum[2] * inv_samples, ctx->inv_gamma);
nuclear@8 415 pix[3] = accum[3] * inv_samples;
nuclear@2 416 }