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amiunits: rotating cube example program, tuned for low-end systems
git-svn-id: trunk@44641 -
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Károly Balogh
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@ -1084,6 +1084,7 @@ packages/amunits/Makefile svneol=native#text/plain
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packages/amunits/Makefile.fpc svneol=native#text/plain
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packages/amunits/Makefile.fpc.fpcmake svneol=native#text/plain
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packages/amunits/README.txt svneol=native#text/plain
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packages/amunits/examples/amicube.pas svneol=native#text/plain
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packages/amunits/examples/asltest.pas svneol=native#text/plain
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packages/amunits/examples/bezier.pas svneol=native#text/plain
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packages/amunits/examples/bezier2.pas svneol=native#text/plain
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339
packages/amunits/examples/amicube.pas
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339
packages/amunits/examples/amicube.pas
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@ -0,0 +1,339 @@
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{
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Copyright (c) 2020 Karoly Balogh
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Rotating 3D cube in a Workbench window
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Example program for Free Pascal's Amiga bindings
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on legacy systems (OS1.x)
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This example program is in the Public Domain under the terms of
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Unlicense: http://unlicense.org/
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**********************************************************************}
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{$MEMORY 32768,4096}
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program amicube;
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uses
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exec, intuition, agraphics;
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type
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tvertex = record
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x: longint;
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y: longint;
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z: longint;
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pad: longint;
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end;
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const
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cube: array[0..7] of tvertex = (
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( x: -1; y: -1; z: -1; pad: 0), // 0
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( x: 1; y: -1; z: -1; pad: 0), // 1
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( x: 1; y: 1; z: -1; pad: 0), // 2
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( x: -1; y: 1; z: -1; pad: 0), // 3
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( x: -1; y: -1; z: 1; pad: 0), // 4
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( x: 1; y: -1; z: 1; pad: 0), // 5
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( x: 1; y: 1; z: 1; pad: 0), // 6
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( x: -1; y: 1; z: 1; pad: 0) // 7
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);
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type
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tface = record
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v1, v2, v3: longint;
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edge: longint;
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end;
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const
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faces: array[0..11] of tface = (
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( v1: 0; v2: 2; v3: 1; edge: 6), // front
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( v1: 2; v2: 0; v3: 3; edge: 6),
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( v1: 0; v2: 1; v3: 4; edge: 5), // top
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( v1: 1; v2: 5; v3: 4; edge: 3),
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( v1: 3; v2: 0; v3: 7; edge: 5), // left
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( v1: 0; v2: 4; v3: 7; edge: 3),
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( v1: 1; v2: 2; v3: 5; edge: 5), // right
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( v1: 1; v2: 6; v3: 5; edge: 6),
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( v1: 2; v2: 3; v3: 6; edge: 5), // bottom
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( v1: 3; v2: 7; v3: 6; edge: 3),
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( v1: 4; v2: 5; v3: 6; edge: 3), // back
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( v1: 6; v2: 7; v3: 4; edge: 3)
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);
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const
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sincos_table: array[0..255] of longint = (
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0, 1608, 3216, 4821, 6424, 8022, 9616, 11204,
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12785, 14359, 15924, 17479, 19024, 20557, 22078, 23586,
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25079, 26557, 28020, 29465, 30893, 32302, 33692, 35061,
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36409, 37736, 39039, 40319, 41575, 42806, 44011, 45189,
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46340, 47464, 48558, 49624, 50659, 51664, 52638, 53580,
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54490, 55367, 56211, 57021, 57797, 58537, 59243, 59913,
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60546, 61144, 61704, 62227, 62713, 63161, 63571, 63943,
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64276, 64570, 64826, 65042, 65219, 65357, 65456, 65515,
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65535, 65515, 65456, 65357, 65219, 65042, 64826, 64570,
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64276, 63943, 63571, 63161, 62713, 62227, 61704, 61144,
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60546, 59913, 59243, 58537, 57797, 57021, 56211, 55367,
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54490, 53580, 52638, 51664, 50659, 49624, 48558, 47464,
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46340, 45189, 44011, 42806, 41575, 40319, 39039, 37736,
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36409, 35061, 33692, 32302, 30893, 29465, 28020, 26557,
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25079, 23586, 22078, 20557, 19024, 17479, 15924, 14359,
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12785, 11204, 9616, 8022, 6424, 4821, 3216, 1608,
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0, -1608, -3216, -4821, -6424, -8022, -9616,-11204,
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-12785,-14359,-15924,-17479,-19024,-20557,-22078,-23586,
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-25079,-26557,-28020,-29465,-30893,-32302,-33692,-35061,
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-36409,-37736,-39039,-40319,-41575,-42806,-44011,-45189,
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-46340,-47464,-48558,-49624,-50659,-51664,-52638,-53580,
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-54490,-55367,-56211,-57021,-57797,-58537,-59243,-59913,
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-60546,-61144,-61704,-62227,-62713,-63161,-63571,-63943,
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-64276,-64570,-64826,-65042,-65219,-65357,-65456,-65515,
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-65535,-65515,-65456,-65357,-65219,-65042,-64826,-64570,
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-64276,-63943,-63571,-63161,-62713,-62227,-61704,-61144,
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-60546,-59913,-59243,-58537,-57797,-57021,-56211,-55367,
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-54490,-53580,-52638,-51664,-50659,-49624,-48558,-47464,
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-46340,-45189,-44011,-42806,-41575,-40319,-39039,-37736,
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-36409,-35061,-33692,-32302,-30893,-29465,-28020,-26557,
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-25079,-23586,-22078,-20557,-19024,-17479,-15924,-14359,
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-12785,-11204, -9616, -8022, -6424, -4821, -3216, -1608
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);
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function sin(x: longint): longint; inline;
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begin
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sin:=sincos_table[x and 255];
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end;
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function cos(x: longint): longint; inline;
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begin
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cos:=sincos_table[(x + 64) and 255];
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end;
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function mulfp(a, b: longint): longint; inline;
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begin
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mulfp:=sarint64((int64(a) * b),16);
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end;
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function divfp(a, b: longint): longint;
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begin
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divfp:=(int64(a) shl 16) div b;
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end;
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procedure rotate_vertex(const v: tvertex; var vr: tvertex; xa, ya, za: longint);
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var
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x,y,z: longint;
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s,c: longint;
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begin
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s :=sin(ya);
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c :=cos(ya);
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x :=mulfp(c,v.x) - mulfp(s,v.z);
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z :=mulfp(s,v.x) + mulfp(c,v.z);
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if za <> 0 then
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begin
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vr.x:=mulfp(cos(za),x) + mulfp(sin(za),v.y);
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y :=mulfp(cos(za),v.y) - mulfp(sin(za),x);
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end
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else
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begin
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vr.x:=x;
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y:=v.y;
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end;
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vr.z:=mulfp(cos(xa),z) - mulfp(sin(xa),y);
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vr.y:=mulfp(sin(xa),z) + mulfp(cos(xa),y);
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end;
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procedure perspective_vertex(const v: tvertex; zc: longint; var xr,yr: longint);
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var
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rzc: longint;
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begin
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rzc:=divfp(1 shl 16,(v.z - zc));
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xr:=mulfp(mulfp(v.x,zc),rzc);
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yr:=mulfp(mulfp(v.y,zc),rzc);
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end;
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procedure init_cube;
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var
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i: longint;
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begin
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for i:=low(cube) to high(cube) do
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begin
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cube[i].x:=cube[i].x shl 16;
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cube[i].y:=cube[i].y shl 16;
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cube[i].z:=cube[i].z shl 16;
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end;
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end;
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const
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win_info: array[0..63] of char = '';
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var
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win: PWindow;
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const
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IDCMPS = IDCMP_CLOSEWINDOW or IDCMP_NEWSIZE or IDCMP_INTUITICKS;
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WFLGS = WFLG_DRAGBAR or WFLG_DEPTHGADGET or WFLG_CLOSEGADGET or WFLG_SIZEGADGET or WFLG_ACTIVATE or WFLG_NOCAREREFRESH;
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WINTITLE = 'FPC Amiga Cube';
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const
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winlayout: TNewWindow = (
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LeftEdge: 20;
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TopEdge: 20;
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Width: 240;
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Height: 150;
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DetailPen: 0;
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BlockPen: 1;
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IDCMPFlags: IDCMPS;
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Flags: WFLGS;
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FirstGadget: nil;
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CheckMark: nil;
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Title: WINTITLE;
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Screen: nil;
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BitMap: nil;
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MinWidth: 0;
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MinHeight: 0;
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MaxWidth: 320;
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MaxHeight: 200;
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WType: WBENCHSCREEN_F;
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);
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function open_win: PWindow;
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var
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newwin: TNewWindow;
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begin
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newwin:=winlayout;
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open_win:=OpenWindow(@newwin);
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end;
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function min(a, b: smallint): smallint;
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begin
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if a < b then
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min:=a
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else
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min:=b;
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end;
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procedure win_redraw(mx, my: longint);
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var
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sx,sy: string[16];
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i,cx,cy,vx,vy: longint;
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rcube: array[low(cube)..high(cube)] of tvertex;
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vr: tvertex;
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scale: longint;
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wx,wy,ww,wh: longint;
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begin
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wx:=win^.borderleft;
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ww:=win^.width-(win^.borderleft+win^.borderright);
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wy:=win^.bordertop;
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wh:=win^.height-(win^.bordertop+win^.borderbottom);
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scale:=(min(wh,ww) div 4) shl 16;
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cx:=wx + ww div 2;
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cy:=wy + wh div 2;
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for i:=low(cube) to high(cube) do
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begin
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rotate_vertex(cube[i],vr,-my,-mx,0);
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perspective_vertex(vr,3 shl 16,vx,vy);
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rcube[i].x:=cx + sarlongint(mulfp(vx,scale),16);
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rcube[i].y:=cy + sarlongint(mulfp(vy,scale div 2),16);
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// the div 2 part above is a hack, to make the cube look
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// less distorted on a 640x256 screen...
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end;
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str(mx,sx);
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str(my,sy);
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win_info:='Spinning... X:'+sx+' Y:'+sy;
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SetAPen(win^.rport,0);
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RectFill(win^.rport,wx,wy,wx+ww,wy+wh);
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SetAPen(win^.rport,1);
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gfxMove(win^.rport,wx+5,wy+10);
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gfxText(win^.rport, win_info, strlen(win_info));
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for i:=low(faces) to high(faces) do
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begin
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with faces[i] do
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begin
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if (edge and 1) > 0 then
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begin
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gfxMove(win^.rport,rcube[v1].x,rcube[v1].y);
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draw(win^.rport,rcube[v2].x,rcube[v2].y);
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end;
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if (edge and 2) > 0 then
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begin
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gfxMove(win^.rport,rcube[v2].x,rcube[v2].y);
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draw(win^.rport,rcube[v3].x,rcube[v3].y);
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end;
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if (edge and 4) > 0 then
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begin
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gfxMove(win^.rport,rcube[v3].x,rcube[v3].y);
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draw(win^.rport,rcube[v1].x,rcube[v1].y);
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end;
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end;
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end;
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end;
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procedure event_loop;
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var
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quit: boolean;
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IMsg: PIntuiMessage;
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//ICode: Word;
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//IQual: Word;
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IClass: LongWord;
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MouseX: LongInt;
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MouseY: LongInt;
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OldMouseX: LongInt;
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OldMouseY: LongInt;
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begin
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quit:=false;
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OldMouseX:=-1;
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OldMouseY:=-1;
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repeat
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IMsg:=PIntuiMessage(WaitPort(win^.UserPort));
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IMsg:=PIntuiMessage(GetMsg(win^.UserPort));
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while IMsg <> nil do
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begin
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//ICode:=IMsg^.Code;
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//IQual:=IMsg^.Qualifier;
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IClass:=IMsg^.iClass;
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MouseX:=IMsg^.MouseX;
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MouseY:=IMsg^.MouseY;
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ReplyMsg(PMessage(IMsg));
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case IClass of
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IDCMP_NEWSIZE:
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begin
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win_redraw(OldMouseX,OldMouseY);
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end;
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IDCMP_CLOSEWINDOW:
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begin
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quit:=true;
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end;
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IDCMP_INTUITICKS:
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begin
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if (MouseX <> OldMouseX) or (MouseY <> OldMouseY) then
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begin
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OldMouseX:=MouseX;
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OldMouseY:=MouseY;
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win_redraw(OldMouseX,OldMouseY);
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end;
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end;
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end;
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IMsg:=PIntuiMessage(GetMsg(win^.UserPort));
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end;
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until quit;
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end;
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begin
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init_cube;
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win:=open_win;
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if win <> nil then
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begin
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event_loop;
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CloseWindow(win);
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end;
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end.
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