/* There is a coarse and a fine-grained. The coarse gets flood-filled but the fine grained is only outlines. */ class Photon { Photon *next, *last; CD3 p, v, n, p_normal_inhibit; } p_root[mp_count]; I64 p_root_locks; #define ANIMATE_JIFFIES (JIFFY_FREQ * 0.01) I64 master_sleep_jiffy; CTask *animate_tasks[mp_count]; #define LENS_COLOR WHITE #define MIRROR_COLOR DKGRAY CDC *map; I64 photon_count, mirror_count, snell_count, normal_inhibit, zero_normal; Bool full_speed, show_normals; U8 *bmp_refract, *bmp_reflect; F64 bmp_scale, find_normal_dist_sqr; I64 bmp_mem, bmp_width, bmp_height, bmp_norm_radius; #define BORDER 10 I64 BmpPeek(U8 *bmp, I64 x, I64 y) { return Bt(bmp, y * bmp_width + x); } U0 BmpPlot(U8 *bmp, I64 x, I64 y, I64) { if (0 <= x < bmp_width && 0 <= y < bmp_height) Bts(bmp, y * bmp_width + x); } U0 BmpLine(U8 *bmp, F64 x1, F64 y1, F64 x2, F64 y2) { Line(bmp, x1 * bmp_scale, y1 * bmp_scale, 0, x2 * bmp_scale, y2 * bmp_scale, 0, &BmpPlot); } Photon *PhotonNew() { I64 num = photon_count++ % mp_count; Photon *res = CAlloc(sizeof(Photon)); while (LBts(&p_root_locks, num)) Yield; QueueInsert(res, p_root[num].last); LBtr(&p_root_locks, num); return res; } #define VECTOR 20 U0 DrawIt(CTask *, CDC *dc) { I64 i; Photon *tmpp; GrBlot(dc, 0, 0, map); dc->color = WHITE; GrPrint(dc, 0, 0, "Mem:0x%X %,dMeg Scale:%0.3f (%d,%d)-->(%d,%d)", bmp_mem, bmp_mem / 1024 / 1024, bmp_scale, map->width, map->height, bmp_width, bmp_height); GrPrint(dc, 0, FONT_HEIGHT, "PhotonCount:%d MirrorCount:%d SnellCount:%d SnellInhibit:%d ZeroNormal:%d", photon_count, mirror_count, snell_count, normal_inhibit, zero_normal); for (i = 0; i < mp_count; i++) { while (LBts(&p_root_locks, i)) Yield; tmpp = p_root[i].next; while (tmpp != &p_root[i]) { dc->color = LTRED; GrLine(dc, tmpp->p.x - VECTOR * tmpp->v.x, tmpp->p.y - VECTOR * tmpp->v.y, tmpp->p.x, tmpp->p.y); if (show_normals) { dc->color = LTGREEN; GrLine(dc, tmpp->p.x, tmpp->p.y, tmpp->p.x + VECTOR * tmpp->n.x, tmpp->p.y + VECTOR * tmpp->n.y); } tmpp = tmpp->next; } LBtr(&p_root_locks, i); } } #define WING 9 U0 RayBurst(I64 x1, I64 y1, I64 x2, I64 y2) { CD3 p, v, n, n2; I64 i; Photon *tmpp; if ((x1 != x2 || y1 != y2) && BORDER + WING < x2 < map->width - BORDER - WING && BORDER + WING < y2 < map->height - BORDER-WING) { D3Equ(&p, x2, y2); D3Equ(&v, x2 - x1, y2 - y1); D3Unit(&v); D3Equ(&n, v.y, -v.x); tmpp = PhotonNew; D3Copy(&tmpp->p, &p); D3Copy(&tmpp->v, &v); for (i = 2; i <= WING; i += 3) { D3Mul(&n2, i, &n); tmpp = PhotonNew; D3Add(&tmpp->p, &p, &n2); D3Copy(&tmpp->v, &v); tmpp = PhotonNew; D3Sub(&tmpp->p, &p, &n2); D3Copy(&tmpp->v, &v); } } } U0 RandomBurst() { I64 i; F64 theta; Photon *tmpp; for (i = 0; i < 256; i++) { tmpp = PhotonNew; D3Equ(&tmpp->p, (Fs->pix_width - BORDER * 2) * Rand + BORDER, (Fs->pix_height - BORDER * 2) * Rand + BORDER); theta = 2 * pi * Rand; D3Equ(&tmpp->v, Cos(theta), Sin(theta)); } } U0 FindNormal(U8 *bmp, Photon *tmpp) { CD3 p, p1, p2; F64 step, x, y, theta = Arg(tmpp->v.x, tmpp->v.y), phi; I64 state; D3Copy(&tmpp->p_normal_inhibit, &tmpp->p); //Coarse grains has black and white filled-in BSplines. //Fine grained has only white outline without being filled-in. //Back-up a step and move forward to get a fined-grained value //for the point of contact. D3SubEqu(&tmpp->p, &tmpp->v); D3Mul(&p, bmp_scale, &tmpp->p); D3Copy(&p1, &p); while (BmpPeek(bmp, p1.x, p1.y) == BLACK && D3DistSqr(&p, &p1) < find_normal_dist_sqr) D3AddEqu(&p1, &tmpp->v); D3Copy(&p, &p1); D3Div(&tmpp->p, &p, bmp_scale); //Draw an arc one direction, finding point of contact. for (step = 1.0; step >= 0.01; step /= 4) { for (phi = 0; phi <= pi / 4; phi += step * pi / bmp_norm_radius) { x = p.x + bmp_norm_radius * Cos(theta + pi - pi / 4 - phi); y = p.y + bmp_norm_radius * Sin(theta + pi - pi / 4 - phi); if (state = BmpPeek(bmp, x, y)) goto fn_p1; x = p.x + bmp_norm_radius * Cos(theta + pi - pi / 4 + phi); y = p.y + bmp_norm_radius * Sin(theta + pi - pi / 4 + phi); if (state = BmpPeek(bmp, x, y)) goto fn_p1; } for (; phi <= 3 * pi / 4; phi += step * pi / bmp_norm_radius) { x = p.x + bmp_norm_radius * Cos(theta + pi - pi / 4 - phi); y = p.y + bmp_norm_radius * Sin(theta + pi - pi / 4 - phi); if (state = BmpPeek(bmp, x, y)) goto fn_p1; } } fn_p1: if (state) D3Equ(&p1, x, y); else D3Copy(&p1, &tmpp->p); //Draw an arc other direction, finding point of contact. for (step = 1.0; step >= 0.01; step /= 4) { for (phi = 0; phi <= pi / 4; phi += step * pi / bmp_norm_radius) { x = p.x + bmp_norm_radius * Cos(theta + pi + pi / 4 + phi); y = p.y + bmp_norm_radius * Sin(theta + pi + pi / 4 + phi); if (state = BmpPeek(bmp, x, y)) goto fn_p2; x = p.x + bmp_norm_radius * Cos(theta + pi + pi / 4 - phi); y = p.y + bmp_norm_radius * Sin(theta + pi + pi / 4 - phi) ; if (state = BmpPeek(bmp, x, y)) goto fn_p2; } for (; phi <= 3 * pi / 4; phi += step * pi / bmp_norm_radius) { x = p.x + bmp_norm_radius * Cos(theta + pi + pi / 4 + phi); y = p.y + bmp_norm_radius * Sin(theta + pi + pi / 4 + phi); if (state = BmpPeek(bmp, x, y)) goto fn_p2; } } fn_p2: if (state) D3Equ(&p2, x, y); else D3Copy(&p2, &tmpp->p); D3Sub(&p, &p1, &p2); if (D3NormSqr(&p) < 0.01) { D3Equ(&tmpp->n, Cos(theta), Sin(theta)); lock {zero_normal++;} } else { D3Equ(&tmpp->n, p.y, -p.x); if (D3Dot(&tmpp->n, &tmpp->v) < 0) D3Equ(&tmpp->n, -p.y, p.x); D3Unit(&tmpp->n); } } U0 Mirror(Photon *tmpp) {/*<1>/* Graphics Not Rendered in HTML */ thetaout = pi+thetan - (thetain-thetan) */ F64 theta = Arg(tmpp->v.x, tmpp->v.y), thetan; FindNormal(bmp_reflect, tmpp); thetan = Arg(tmpp->n.x, tmpp->n.y); D3Equ(&tmpp->v, Cos(2 * thetan + pi - theta), Sin(2 * thetan + pi - theta)); lock {mirror_count++;} } U0 SnellsLaw(Photon *tmpp, I64 last, I64 next) { //n1 and n2 are refraction index. //n1 Sin(theta1) == n2 Sin(theta2) F64 theta = Arg(tmpp->v.x, tmpp->v.y), thetan, n1, n2, theta1, theta2; if (last == LENS_COLOR) n1 = 1.5; else n1 = 1.0; if (next == LENS_COLOR) n2 = 1.5; else n2 = 1.0; FindNormal(bmp_refract, tmpp); thetan = Arg(tmpp->n.x, tmpp->n.y); //Dot=m1m2Cos(theta); theta1 = ACos(D3Dot(&tmpp->n, &tmpp->v)); theta2 = ASin(n1 * Sin(theta1) / n2); if (Wrap(theta - thetan) >= 0) theta = thetan + theta2; else theta = thetan - theta2; D3Equ(&tmpp->v, Cos(theta), Sin(theta)); lock {snell_count++;} } U0 AnimateTask(I64) { while (TRUE) { master_sleep_jiffy += ANIMATE_JIFFIES; if (counts.jiffies >= master_sleep_jiffy) master_sleep_jiffy = counts.jiffies + ANIMATE_JIFFIES; SleepUntil(master_sleep_jiffy); } } #define BABY_STEPS 4 U0 MPAnimateTask(I64) { I64 i, last_master_jiffy = 0, timeout_jiffy = master_sleep_jiffy + ANIMATE_JIFFIES, last, next; Bool inhibit; CD3 step; Photon *tmpp, *root = &p_root[Gs->num]; while (TRUE) { while (LBts(&p_root_locks, Gs->num)) Yield; tmpp = root->next; while (tmpp != root) { for (i = 0; i < BABY_STEPS; i++) { last = GrPeek(map, tmpp->p.x, tmpp->p.y); D3Div(&step, &tmpp->v, BABY_STEPS); D3AddEqu(&tmpp->p, &step); if (tmpp->p.x < BORDER) { tmpp->p.x = 2 * BORDER - tmpp->p.x; tmpp->v.x = -tmpp->v.x; } if (tmpp->p.x >= map->width-BORDER) { tmpp->p.x -= tmpp->p.x - map->width + BORDER; tmpp->v.x = -tmpp->v.x; } if (tmpp->p.y < BORDER) { tmpp->p.y = 2 * BORDER - tmpp->p.y; tmpp->v.y = -tmpp->v.y; } if (tmpp->p.y >= map->height - BORDER) { tmpp->p.y -= tmpp->p.y - map->height + BORDER; tmpp->v.y = -tmpp->v.y; } next = GrPeek(map, tmpp->p.x, tmpp->p.y); if (D3DistSqr(&tmpp->p_normal_inhibit, &tmpp->p) < 4.0) inhibit = TRUE; else inhibit = FALSE; if (last != next) { if ((last == BLACK && next == LENS_COLOR) || (last == LENS_COLOR && next == BLACK)) { if (inhibit) lock {normal_inhibit++;} else SnellsLaw(tmpp, last, next); } else if (last == BLACK && next == MIRROR_COLOR) { if (inhibit) lock {normal_inhibit++;} else Mirror(tmpp); } else if (!inhibit) D3Zero(&tmpp->p_normal_inhibit); } else if (!inhibit) D3Zero(&tmpp->p_normal_inhibit); } tmpp = tmpp->next; if (counts.jiffies >= timeout_jiffy) break; } LBtr(&p_root_locks, Gs->num); if (counts.jiffies >= timeout_jiffy) { Sleep(1); timeout_jiffy = master_sleep_jiffy + ANIMATE_JIFFIES; } if (!full_speed) { while (master_sleep_jiffy == last_master_jiffy) Sleep(1); last_master_jiffy = master_sleep_jiffy; SleepUntil(master_sleep_jiffy); timeout_jiffy = master_sleep_jiffy + ANIMATE_JIFFIES; } } } U0 Init() { I64 i; master_sleep_jiffy = counts.jiffies; full_speed = show_normals = FALSE; photon_count = mirror_count = snell_count = normal_inhibit = zero_normal = 0; map = DCNew(Fs->pix_width, Fs->pix_height); for (i = 0; i < mp_count; i++) { while (LBts(&p_root_locks, i)) Yield; QueueInit(&p_root[i]); LBtr(&p_root_locks, i); } //x*y=bmp_mem*8 //x/y=640/480 //x=640/480*y //640/480*y^2=bmp_mem*8 //y=Sqrt(bmp_mem*8*480/640) //bmp_scale=Sqrt(bmp_mem*8*480/640)/480 bmp_scale = Sqrt(bmp_mem / 2 * 8 * Fs->pix_height / Fs->pix_width) / Fs->pix_height; find_normal_dist_sqr = 2 * Sqr(bmp_scale); #assert Sqrt(2) <= BORDER bmp_width = bmp_scale * Fs->pix_width; bmp_height = bmp_scale * Fs->pix_height; bmp_refract = CAlloc(bmp_width * bmp_height / 8); bmp_reflect = CAlloc(bmp_width * bmp_height / 8); bmp_norm_radius = Min(10 * bmp_scale, 250); #assert 10 <= BORDER } U0 CleanUp() { I64 i; for (i = 0; i < mp_count; i++) { while (LBts(&p_root_locks, i)) Yield; QueueDel(&p_root[i], TRUE); LBtr(&p_root_locks, i); } DCDel(map); Free(bmp_refract); Free(bmp_reflect); } #define LTM_REFLECT_LINE 0 #define LTM_REFLECT_SPLINE 1 #define LTM_REFRACT_LINE 2 #define LTM_REFRACT_SPLINE 3 #define LTM_REFRACT_FLOOD_FILL 4 #define LTM_TEST_RAY 5 U0 LTMenuSet(I64 mode) { CMenuEntry *entry = MenuEntryFind(Fs->cur_menu, "View/ToggleNormals"); if (show_normals) entry->checked = TRUE; else entry->checked = FALSE; entry = MenuEntryFind(Fs->cur_menu, "Mode/ReflectLine"); if (mode == LTM_REFLECT_LINE) entry->checked = TRUE; else entry->checked = FALSE; entry = MenuEntryFind(Fs->cur_menu, "Mode/ReflectSpline"); if (mode == LTM_REFLECT_SPLINE) entry->checked = TRUE; else entry->checked = FALSE; entry = MenuEntryFind(Fs->cur_menu, "Mode/RefractLine"); if (mode == LTM_REFRACT_LINE) entry->checked = TRUE; else entry->checked = FALSE; entry = MenuEntryFind(Fs->cur_menu, "Mode/RefractSpline"); if (mode == LTM_REFRACT_SPLINE) entry->checked = TRUE; else entry->checked = FALSE; entry = MenuEntryFind(Fs->cur_menu, "Mode/RefractFloodFill"); if (mode == LTM_REFRACT_FLOOD_FILL) entry->checked = TRUE; else entry->checked = FALSE; entry = MenuEntryFind(Fs->cur_menu, "Mode/TestRay"); if (mode == LTM_TEST_RAY) entry->checked = TRUE; else entry->checked = FALSE; } #define PTS_NUM 1024 U0 LightTable() { I64 message_code, mode = LTM_REFLECT_LINE, i, count, arg1, arg2, x1, y1, x2, y2; CD3I32 *c = MAlloc(PTS_NUM * sizeof(CD3I32)); p_root_locks = 0; MenuPush( "File {" " Restart(,'\n');" " Abort(,CH_SHIFT_ESC);" " Exit(,CH_ESC);" "}" "Mode {" " ReflectLine(,'0');" " ReflectSpline(,'1');" " RefractLine(,'2');" " RefractSpline(,'3');" " RefractFloodFill(,'4');" " TestRay(,'5');" "}" "Play {" " RandomBurst(,'r');" " ElapseTime(,'e');" "}" "View {" " ToggleNormals(,'n');" "}" ); LTMenuSet(mode); MemBIOSRep; bmp_mem = I64Get("\n\n\nHow much memory for the high resolution\n" "shadow bitmap that helps improve the\n" "accuracy of the normal vector estimate?\n" "You can choose up to the largest\n" "contiguous chunk of physical memory.\n\n" "Mem (0x%0X):", 1024 * 1024 * 16); SettingsPush; //See SettingsPush Fs->win_inhibit = WIG_TASK_DEFAULT - WIF_SELF_FOCUS - WIF_SELF_BORDER - WIF_FOCUS_TASK_MENU; Fs->text_attr = BLACK << 4 + WHITE; //Current CTask is Fs segment register. AutoComplete; WinBorder; WinMax; DocCursor; DocClear; Init; Fs->draw_it = &DrawIt; Fs->animate_task = Spawn(&AnimateTask, NULL, "Animate",, Fs); for (i = 0; i < mp_count; i++) animate_tasks[i] = Spawn(&MPAnimateTask, NULL, "MPAnimate", i); try { while (TRUE) { message_code = MessageGet(&arg1, &arg2, 1 << MESSAGE_KEY_DOWN + 1 << MESSAGE_MS_L_DOWN + 1 << MESSAGE_MS_L_UP + 1 << MESSAGE_MS_R_UP); lt_restart: switch (message_code) { case MESSAGE_MS_L_UP: Sweep(100, 90, 100); x2 = arg1; y2 = arg2; switch (mode) { case LTM_REFRACT_FLOOD_FILL: map->color = LENS_COLOR; GrFloodFill(map, x2, y2); mode = LTM_REFLECT_LINE; LTMenuSet(mode); break; case LTM_TEST_RAY: RayBurst(x1, y1, x2, y2); break; } break; case MESSAGE_MS_L_DOWN: x1 = arg1; y1 = arg2; switch (mode) { case LTM_REFLECT_LINE: case LTM_REFRACT_LINE: if (mode == LTM_REFLECT_LINE) map->color = ROP_XOR + MIRROR_COLOR; else map->color = ROP_XOR + LENS_COLOR; while (TRUE) { x2 = arg1; y2 = arg2; GrLine(map, x1, y1, x2, y2); message_code = MessageGet(&arg1, &arg2, 1 << MESSAGE_KEY_DOWN + 1 << MESSAGE_MS_L_UP + 1 << MESSAGE_MS_MOVE); GrLine(map, x1, y1, x2, y2); if (message_code == MESSAGE_KEY_DOWN) goto lt_restart; else if (message_code == MESSAGE_MS_L_UP) { Sweep(100, 90, 100); x2 = arg1; y2 = arg2; break; } } if (mode == LTM_REFLECT_LINE) map->color = MIRROR_COLOR; else map->color = LENS_COLOR; GrLine(map, x1, y1, x2, y2); if (mode == LTM_REFLECT_LINE) BmpLine(bmp_reflect, x1, y1, x2, y2); else BmpLine(bmp_refract, x1, y1, x2, y2); break; case LTM_REFLECT_SPLINE: case LTM_REFRACT_SPLINE: count = 0; if (mode == LTM_REFLECT_SPLINE) map->color = ROP_XOR + MIRROR_COLOR; else map->color = ROP_XOR + LENS_COLOR; do { c[count].x = arg1; c[count].y = arg2; c[count].z = 0; Gr2BSpline(map, c, count + 1); message_code = MessageGet(&arg1, &arg2, 1 << MESSAGE_KEY_DOWN + 1 << MESSAGE_MS_L_UP + 1 << MESSAGE_MS_MOVE + 1 << MESSAGE_MS_R_UP); Gr2BSpline(map, c, count + 1); if (message_code == MESSAGE_KEY_DOWN) goto lt_restart; else if (message_code == MESSAGE_MS_L_UP) { Sweep(100, 90, 100); count++; } } while (count < PTS_NUM - 1 && message_code != MESSAGE_MS_R_UP); if (mode == LTM_REFLECT_SPLINE) map->color = MIRROR_COLOR; else map->color = LENS_COLOR; Gr2BSpline3(map, c, count); for (i = 0; i < count; i++) { c[i].x *= bmp_scale; c[i].y *= bmp_scale; } if (mode == LTM_REFLECT_SPLINE) BSpline2(bmp_reflect, c, count, &BmpPlot); else BSpline2(bmp_refract, c, count, &BmpPlot); mode = LTM_REFLECT_LINE; LTMenuSet(mode); break; } break; case MESSAGE_MS_R_UP: i = PopUpPickList("Reflect Line\0Reflect Spline\0Refract Line\0" "Refract Spline\0Refract Flood Fill\0TestRay\0"); if (i >= 0) { mode = i; LTMenuSet(mode); } break; case MESSAGE_KEY_DOWN: switch (arg1) { case '\n': CleanUp; Init; mode = LTM_REFLECT_LINE; LTMenuSet(mode); break; case 'r': RandomBurst; break; case 'e': full_speed = TRUE; Sleep(1500); FlushMessages; full_speed = FALSE; break; case 'n': show_normals = !show_normals; LTMenuSet(mode); break; case '0'...'5': mode = arg1-'0'; LTMenuSet(mode); break; case CH_ESC: case CH_SHIFT_ESC: goto lt_done; } break; } } lt_done: MessageGet(,, 1 << MESSAGE_KEY_UP); } catch PutExcept; Free(c); SettingsPop; for (i = 0; i < mp_count; i++) Kill(animate_tasks[i]); CleanUp; MenuPop; } LightTable;