hedgewars/uLandGenPerlin.pas
author Wuzzy <Wuzzy2@mail.ru>
Fri, 27 Oct 2017 05:03:58 +0200
changeset 12782 389453e1e09e
parent 10702 528d899443ab
child 15032 bea068dd9356
permissions -rw-r--r--
ACF7: Fix possible Lua error spam in intro sequence This was caused by a race of onGearDelete vs AnimationSetup. If AnimationSetup came first, it uses old values from the natives table. The solution is to force the code to guarantee that AnimationSetup always coms after deleting gears in the natives table.

{$INCLUDE "options.inc"}

unit uLandGenPerlin;
interface

procedure GenPerlin;

implementation
uses uVariables
    , uConsts
    , uRandom
    , uLandOutline // FillLand
    , uUtils
    ;

var p: array[0..511] of LongInt;

const fadear: array[byte] of LongInt =
(0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 6, 7, 9, 10, 12,
14, 17, 19, 22, 25, 29, 32, 36, 40, 45, 49, 54, 60, 65, 71,
77, 84, 91, 98, 105, 113, 121, 130, 139, 148, 158, 167, 178,
188, 199, 211, 222, 234, 247, 259, 273, 286, 300, 314, 329, 344,
359, 374, 390, 407, 424, 441, 458, 476, 494, 512, 531, 550,
570, 589, 609, 630, 651, 672, 693, 715, 737, 759, 782, 805, 828,
851, 875, 899, 923, 948, 973, 998, 1023, 1049, 1074, 1100, 1127,
1153, 1180, 1207, 1234, 1261, 1289, 1316, 1344, 1372, 1400, 1429,
1457, 1486, 1515, 1543, 1572, 1602, 1631, 1660, 1690, 1719, 1749,
1778, 1808, 1838, 1868, 1898, 1928, 1958, 1988, 2018, 2048, 2077,
2107, 2137, 2167, 2197, 2227, 2257, 2287, 2317, 2346, 2376, 2405,
2435, 2464, 2493, 2523, 2552, 2580, 2609, 2638, 2666, 2695, 2723,
2751, 2779, 2806, 2834, 2861, 2888, 2915, 2942, 2968, 2995, 3021,
3046, 3072, 3097, 3122, 3147, 3172, 3196, 3220, 3244, 3267, 3290,
3313, 3336, 3358, 3380, 3402, 3423, 3444, 3465, 3486, 3506, 3525,
3545, 3564, 3583, 3601, 3619, 3637, 3654, 3672, 3688, 3705, 3721,
3736, 3751, 3766, 3781, 3795, 3809, 3822, 3836, 3848, 3861, 3873,
3884, 3896, 3907, 3917, 3928, 3937, 3947, 3956, 3965, 3974, 3982,
3990, 3997, 4004, 4011, 4018, 4024, 4030, 4035, 4041, 4046, 4050,
4055, 4059, 4063, 4066, 4070, 4073, 4076, 4078, 4081, 4083, 4085,
4086, 4088, 4089, 4091, 4092, 4092, 4093, 4094, 4094, 4095, 4095,
4095, 4095, 4095, 4095, 4095);

function fade(t: LongInt) : LongInt; inline;
var t0, t1: LongInt;
begin
    t0:= fadear[t shr 8];

    if t0 = fadear[255] then
        t1:= t0
    else
        t1:= fadear[t shr 8 + 1];

    fade:= t0 + ((t and 255) * (t1 - t0) shr 8)
end;


function lerp(t, a, b: LongInt) : LongInt; inline;
begin
    lerp:= a + ((Int64(b) - a) * t shr 12)
end;


function grad(hash, x, y: LongInt) : LongInt; inline;
var h, v, u: LongInt;
begin
    h:= hash and 15;
    if h < 8 then u:= x else u:= y;
    if h < 4 then v:= y else
        if (h = 12) or (h = 14) then v:= x else v:= 0;

    if (h and 1) <> 0 then u:= -u;
    if (h and 2) <> 0 then v:= -v;

    grad:= u + v
end;


function inoise(x, y: LongInt) : LongInt; inline;
const N = $10000;
var xx, yy, u, v, A, AA, AB, B, BA, BB: LongInt;
begin
    xx:= (x shr 16) and 255;
    yy:= (y shr 16) and 255;

    x:= x and $FFFF;
    y:= y and $FFFF;

    u:= fade(x);
    v:= fade(y);

    A:= p[xx    ] + yy; AA:= p[A]; AB:= p[A + 1];
    B:= p[xx + 1] + yy; BA:= p[B]; BB:= p[B + 1];

    inoise:=
            lerp(v, lerp(u, grad(p[AA  ], x   , y  ),
                            grad(p[BA  ], x-N , y  )),
                    lerp(u, grad(p[AB  ], x   , y-N),
                            grad(p[BB  ], x-N , y-N)));
end;

procedure inoise_setup();
var i, ii, t: Longword;
begin
    for i:= 0 to 254 do
        p[i]:= i + 1;
    p[255]:= 0;

    for i:= 0 to 254 do
    begin
        ii:= GetRandom(256 - i) + i;
        t:= p[i];
        p[i]:= p[ii];
        p[ii]:= t
    end;

    for i:= 0 to 255 do
        p[256 + i]:= p[i];
end;

const width = 4096;
      height = 2048;
      minY = 500;

    //bottomPlateHeight = 90;
    //bottomPlateMargin = 1200;
    margin = 200;

procedure GenPerlin;
var y, x, di, dj, r, param1, param2, rCutoff, detail: LongInt;
var df: Int64;
begin
    param1:= cTemplateFilter div 3;
    param2:= cTemplateFilter mod 3;
    rCutoff:= min(max((26-cFeatureSize)*4,15),85);
    detail:= (26-cFeatureSize)*16000+50000; // feature size is a slider from 1-25 at present. flip it for perlin

    df:= detail * (6 - param2 * 2);

    inoise_setup();

    for y:= minY to pred(height) do
    begin
        di:= df * y div height;
        for x:= 0 to pred(width) do
        begin
            dj:= df * x div width;

            r:= ((abs(inoise(di, dj)) + y*4) mod 65536 - (height - y) * 8) div 256;

            //r:= (abs(inoise(di, dj))) shr 8 and $ff;
            if (x < margin) or (x > width - margin) then r:= r - abs(x - width div 2) + width div 2 - margin; // fade on edges

            //r:= r - max(0, - abs(x - width div 2) + width * 2 div 100); // split vertically in the middle
            //r:= r + (trunc(1000 - sqrt(sqr(x - (width div 2)) * 4 + sqr(y - height * 5 div 4) * 22))) div 600 * 20; // ellipse
            //r:= r + 1 - ((abs(x - (width div 2)) + abs(y - height) * 2)) div 32; // manhattan length ellipse

            {
            if (y > height - bottomPlateHeight) and (x > bottomPlateMargin) and (x + bottomPlateMargin < width) then
            begin
                dy:= (y - height + bottomPlateHeight);
                r:= r + dy;

                if x < bottomPlateMargin + bottomPlateHeight then
                    r:= r + (x - bottomPlateMargin - bottomPlateHeight)
                else
                if x + bottomPlateMargin + bottomPlateHeight > width then
                    r:= r - (x - width + bottomPlateMargin + bottomPlateHeight);
            end;
            }

            if r < rCutoff then
                Land[y, x]:= 0
            else if param1 = 0 then
                Land[y, x]:= lfObjMask
            else
                Land[y, x]:= lfBasic
        end;
    end;

    if param1 = 0 then
        begin
        for x:= 0 to width do
            if Land[height - 1, x] = lfObjMask then FillLand(x, height - 1, 0, lfBasic);

        // strip all lfObjMask pixels
        for y:= minY to LAND_HEIGHT - 1 do
            for x:= 0 to LAND_WIDTH - 1 do
                if Land[y, x] = lfObjMask then
                    Land[y, x]:= 0;
        end;

    leftX:= 0;
    rightX:= 4095;
    topY:= 0;
    hasBorder:= false;
end;

end.