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| 610 | } |
610 | } |
| 611 | |
611 | |
| 612 | template class frac_gen<vec2d>; |
612 | template class frac_gen<vec2d>; |
| 613 | template class frac_gen<vec3d>; |
613 | template class frac_gen<vec3d>; |
| 614 | |
614 | |
| 615 | ///////////////////////////////////////////////////////////////////////////// |
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| 616 | |
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| 617 | template<typename T, typename U> |
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| 618 | T |
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| 619 | inline border_blend (T a, T b, vec2d P, U N, U W) |
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| 620 | { |
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| 621 | U border = W; // within n places of the border |
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| 622 | |
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| 623 | min_it (border, P [0]); |
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| 624 | min_it (border, N - P [0]); |
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| 625 | min_it (border, P [1]); |
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| 626 | min_it (border, N - P [1]); |
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| 627 | |
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| 628 | return blend (a, b,border, U(0), W); |
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| 629 | } |
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| 630 | |
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| 631 | // highest mountains, deepest sea == 200 .. -200 |
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| 632 | |
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| 633 | static void |
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| 634 | gen_height (int x, int y) |
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| 635 | { |
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| 636 | vec2d P = vec2d (x, y); |
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| 637 | |
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| 638 | const int deep_sea_z = -200; |
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| 639 | const int mountain_z = 200; |
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| 640 | |
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| 641 | static frac2d gen(13); |
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| 642 | |
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| 643 | static frac2d vec_gen1 (6, 2, 0.5, 1); |
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| 644 | static frac2d vec_gen2 (6, 2, 0.5, 2); |
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| 645 | |
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| 646 | const float continent_scale = 0.00008; |
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| 647 | |
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| 648 | vec2d perturb_pos = pow (P, 1.4) * 1e-5; |
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| 649 | |
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| 650 | vec2d perturb ( |
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| 651 | vec_gen1.fBm (perturb_pos), |
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| 652 | vec_gen2.fBm (perturb_pos) |
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| 653 | ); |
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| 654 | |
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| 655 | float perturb_perturb = 1 - (P[1] - P[0]) * (1. / 25000 / 2); |
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| 656 | perturb_perturb = perturb_perturb * perturb_perturb * 0.4; |
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| 657 | perturb *= perturb_perturb; |
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| 658 | |
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| 659 | vec2d P_continent = P * continent_scale + perturb; |
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| 660 | |
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| 661 | static frac2d continent_gen (13, 2.13, 0.5); |
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| 662 | float continent = continent_gen.fBm (P_continent) + 0.05f; |
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| 663 | |
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| 664 | float x_gradient = P[0] * (1. / 25000); |
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| 665 | float y_gradient = P[1] * (1. / 25000); |
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| 666 | float xy_gradient = (P[0] + P[1]) * (0.5 / 25000); |
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| 667 | |
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| 668 | const float N = (25000 - 1) * continent_scale; |
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| 669 | |
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| 670 | // we clip a large border on the perturbed shape, to get irregular coastline |
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| 671 | // and then clip a smaller border around the real shape |
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| 672 | continent = border_blend (-1.f, continent, P_continent , N, 400 * continent_scale); |
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| 673 | continent = border_blend (-1.f, continent, P * continent_scale + perturb * 0.1, N, 100 * continent_scale); |
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| 674 | |
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| 675 | enum { |
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| 676 | T_NONE, |
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| 677 | T_OCEAN, |
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| 678 | T_RIVER, |
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| 679 | T_VALLEY, |
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| 680 | T_MOUNTAIN, |
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| 681 | } t = T_NONE; |
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| 682 | |
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| 683 | vec3d c; |
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| 684 | int z = 1000000; |
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| 685 | |
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| 686 | // the continent increases in height from 0 to ~700 levels in the absence of anything else |
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| 687 | // thats about one step every 7 maps. |
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| 688 | int base_height = blend (0, 300, xy_gradient, 0.2f, 0.9f); |
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| 689 | int river_height = base_height * 9 / 10; |
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| 690 | |
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| 691 | // add this to rivers to "dry them out" |
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| 692 | float dry_out = max (0.f, lerp (xy_gradient, 0.7f, 1.f, 0.f, 0.3f)); |
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| 693 | |
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| 694 | static frac2d river_gen (2); |
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| 695 | float river1 = abs (river_gen.fBm (P * 0.001 + perturb * 4)) + dry_out; |
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| 696 | float river2 = river_gen.ridgedmultifractal (P * 0.04, 0.8, 10) - y_gradient * 0.2 - 0.16 - dry_out; |
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| 697 | |
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| 698 | float valley = river1 - 0.2f; |
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| 699 | |
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| 700 | static frac2d mountain_gen (8, 2.14, 0.5); |
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| 701 | float mountain = mountain_gen.ridgedmultifractal (P * 0.004); |
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| 702 | |
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| 703 | t = valley < 0 ? T_VALLEY : T_MOUNTAIN; |
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| 704 | c = blend0 (vec3d (0.8, 0.8, 0), vec3d (0.8, 0, 0), valley, 0.1f); |
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| 705 | z = blend0 (base_height + continent * 300, base_height + mountain * xy_gradient * 400, valley, 0.1f); |
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| 706 | |
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| 707 | if (river1 < 0.01f) |
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| 708 | { |
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| 709 | // main rivers - they cut deeply into the mountains (base_height * 0.9f) |
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| 710 | t = T_RIVER; |
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| 711 | c = vec3d (0.2, 0.2, 1); |
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| 712 | min_it (z, river_height + lerp<float> (river1, 0.f, 0.01f, -20, -1)); |
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| 713 | } |
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| 714 | |
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| 715 | if (river2 > 0) |
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| 716 | { |
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| 717 | t = T_RIVER; |
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| 718 | c = vec3d (0.2, 0.2, 1); |
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| 719 | min_it (z, river_height + lerp<float> (river1, 0.f, 0.01f, -5, -1)); |
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| 720 | } |
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| 721 | |
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| 722 | if (continent < 0) |
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| 723 | { |
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| 724 | t = T_OCEAN; |
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| 725 | min_it (z, min (continent * 200, -1)); |
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| 726 | c = vec3d (0, 0, 1); |
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| 727 | } |
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| 728 | |
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| 729 | float v = clamp (lerp<float> (z, deep_sea_z, mountain_z*0+800, 0.f, 1.f), 0.f, 1.f); |
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| 730 | c *= v; |
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| 731 | |
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| 732 | putc (clamp<int> (255 * c[0], 0, 255), stdout); |
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| 733 | putc (clamp<int> (255 * c[1], 0, 255), stdout); |
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| 734 | putc (clamp<int> (255 * c[2], 0, 255), stdout); |
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| 735 | } |
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| 736 | |
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| 737 | void noise_test (); |
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| 738 | void noise_test () |
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| 739 | { |
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| 740 | #if 1 |
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| 741 | int Nw = 700; |
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| 742 | |
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| 743 | printf ("P6 %d %d 255\n", Nw * 3, Nw * 2); |
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| 744 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
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| 745 | for (int y = 0; y < Nw; ++y) |
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| 746 | { |
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| 747 | if (!(y&63))fprintf (stderr, "y %d\n", y * 50 / Nw);//D |
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| 748 | |
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| 749 | for (int x = 0; x < Nw; ++x) gen_height (x * 25000 / Nw, y * 25000 / Nw); |
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| 750 | |
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| 751 | for (int x = 0; x < Nw; ++x) gen_height (x + 400, y); |
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| 752 | for (int x = 0; x < Nw; ++x) gen_height (x + 22000, y + 2000); |
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| 753 | } |
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| 754 | for (int y = 0; y < Nw; ++y) |
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| 755 | { |
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| 756 | if (!(y&63))fprintf (stderr, "y %d\n", y * 50 / Nw+50);//D |
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| 757 | |
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| 758 | for (int x = 0; x < Nw; ++x) gen_height (x + 1000, y + 22000); |
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| 759 | for (int x = 0; x < Nw; ++x) gen_height (x + 12500, y + 12500); |
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| 760 | for (int x = 0; x < Nw; ++x) gen_height (x + 22000, y + 22000); |
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| 761 | } |
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| 762 | |
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| 763 | //putc (127 * gen.noise (vec2d (x * 0.01, y * 0.01)) + 128, stdout); |
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| 764 | //putc (256 * gen.terrain2 (x * 0.004, y * 0.004, 8), stdout); |
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| 765 | //putc (256 * gen.fBm (vec2d(x * 0.01, y * 0.01), 16), stdout); |
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| 766 | //putc (256 * gen.turbulence (vec2d (x * 0.004 - 1, y * 0.004 - 1), 10), stdout); |
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| 767 | //putc (256 * gen.heterofractal (vec2d (x * 0.008, y * 0.008), 8, 0.9), stdout); |
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| 768 | //putc (256 * gen.hybridfractal (vec2d (x * 0.01, y * 0.01), 8, -.4, -4), stdout); |
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| 769 | //putc (256 * gen.fBm (vec2d (x * 0.002, y * 0.002), 2), stdout); |
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| 770 | //putc (127.49 * gen.billowfractal (vec2d (x * 0.01, y * 0.01), 9) + 128, stdout); |
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| 771 | #else |
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| 772 | int N = 128; |
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| 773 | |
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| 774 | //printf ("P6 %d %d 255\n", N, N); |
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| 775 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
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| 776 | frac3d gen3 (3);; |
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| 777 | for (int z = 0; z < N; ++z) |
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| 778 | { |
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| 779 | if (!(z&7))fprintf (stderr, "z %d\n", z);//D |
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| 780 | for (int y = 0; y < N; ++y) |
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| 781 | for (int x = 0; x < N; ++x) |
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| 782 | { |
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| 783 | float v = gen3.ridgedmultifractal (vec3d (x * 0.001 + 0.2, y * 0.001 + 0.2, z * 0.01 + 0.2), 1.03, 2) * 2; |
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| 784 | |
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| 785 | #if 0 |
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| 786 | if (z < 64) |
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| 787 | v = v * (z * z) / (64 * 64); |
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| 788 | #endif |
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| 789 | |
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| 790 | if (v <= 0.9) |
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| 791 | continue; |
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| 792 | |
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| 793 | float r[4]; |
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| 794 | int i[4]; |
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| 795 | |
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| 796 | r[0] = x; |
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| 797 | r[1] = y; |
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| 798 | r[2] = z; |
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| 799 | r[3] = v; |
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| 800 | |
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| 801 | memcpy (i, r, 16); |
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| 802 | |
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| 803 | i[0] = htonl (i[0]); |
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| 804 | i[1] = htonl (i[1]); |
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| 805 | i[2] = htonl (i[2]); |
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| 806 | i[3] = htonl (i[3]); |
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| 807 | |
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| 808 | fwrite (i, 4*4, 1, stdout); |
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| 809 | } |
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| 810 | } |
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| 811 | #endif |
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| 812 | |
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| 813 | exit (0); |
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| 814 | } |
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