DIRECTORY
FastBreak,
Frame USING [GetReturnLink],
Graphics USING
[black, Context, DrawBox, NewContext, SetColor, SetCP, SetPaintMode, white],
GraphicsOps USING
[BitmapRef, BitmapRep, Context, DrawBitmap, NewBitmap, NewContextFromBitmap],
Icons USING [DrawIcon],
PrincOps USING
[BytePC, ControlLink, CSegPrefix, GlobalFrameHandle, NullLink, StateVector],
Process USING
[GetPriority, Priority, SetPriority],
ProcessPriorities USING [priorityClientHigh],
Rope USING [ROPE],
Runtime USING [GlobalFrame],
SDDefs USING [sCallDebugger, SD, sInterrupt, sWorryCallDebugger],
System USING
[gmtEpoch, GreenwichMeanTime, SecondsSinceEpoch],
Time USING [Current],
UserTerminal USING [screenHeight, screenWidth, WaitForScanLine],
ViewerClasses USING [Viewer],
ViewerOps USING
[DisablePainting, EnablePainting, FindViewer, GreyScreen, OpenIcon, PaintViewer, WaitForPaintingToFinish];

SpecialCache: MONITOR
IMPORTS FastBreak, Frame, Graphics, GraphicsOps, Icons,
Process, Runtime, System, Time, UserTerminal, ViewerOps
SHARES ViewerOps
= BEGIN OPEN Rope;

MapSeq: TYPE = RECORD
[SEQUENCE len: NAT OF Map];
Map: TYPE = RECORD [
x0, y0: CARDINAL _ 0,
xpos,ypos: INTEGER _ 0,
xvel,yvel: INTEGER _ 0];

CARD: TYPE = LONG CARDINAL;

base: GraphicsOps.BitmapRef _ NIL;
blinks: INTEGER _ 4;
ctx: Graphics.Context _ NIL;
enabled: BOOL _ TRUE;
hack: REF GraphicsOps.BitmapRep _ NIL;
iconCtx: Graphics.Context _ NIL;
iconSize: INTEGER = 64;
invG: INTEGER _ 2; -- number of steps between gravity increment
lockup: BOOL _ TRUE; -- TRUE for production, FALSE for debug
maps: REF MapSeq _ NEW[MapSeq[64]];
maxTime: INT _ 32; -- don't hog the world for more than about this many seconds
minYvel: INTEGER _ 3;
pieces: BOOL _ TRUE;
pieceSize: NAT _ 24;
scale: INTEGER _ 1;
scanLines: INTEGER _ 0;
seedMod: INTEGER _ 64;
swapPiecesFlag: BOOL _ FALSE;
setList: LocalData _ NIL;
initialSteps: INTEGER = 80;
bouncingBottom: BOOL _ TRUE;
bouncingTop: BOOL _ TRUE;
bouncingSides: BOOL _ TRUE;
absorbing: NAT _ 7;

LocalData: TYPE = REF LocalDataRep;
LocalDataRep: TYPE = RECORD [
next: LocalData _ NIL,
id: FastBreak.FastBreakId _ NIL,
viewer: ViewerClasses.Viewer _ NIL,
oneShot: BOOL _ TRUE,
targetStart: CARD _ 0,
targetEnd: CARD _ LAST[CARD]];

FrameType: TYPE = RECORD
[w0,w1,w2,w3: CARDINAL, viewer: ViewerClasses.Viewer];

HandleCacheChange: FastBreak.FastBreakProc = TRUSTED {
mine: LocalData _ LOOPHOLE[data];
ptr: POINTER TO FrameType _ LOOPHOLE[frame];
current: System.GreenwichMeanTime _ Time.Current[];
viewer: ViewerClasses.Viewer _ ptr.viewer;
seconds: CARD _ System.SecondsSinceEpoch[current];
IF viewer = NIL OR NOT viewer.iconic THEN RETURN;
IF mine # NIL AND enabled AND
seconds >= mine.targetStart AND
mine.id # NIL AND (mine.viewer = NIL OR viewer = mine.viewer) THEN {
IF mine.oneShot THEN {
[] _ FastBreak.ClearFastBreak[mine.id, HandleCacheChange, data];
mine.id _ NIL;
};
IF seconds < mine.targetEnd THEN DoIt[viewer];
};
};

ProcToCodeAndPC: PROC
[proc: UNSPECIFIED] RETURNS [code: LONG POINTER _ NIL, pc: PrincOps.BytePC] = {
gfh: PrincOps.GlobalFrameHandle _ LOOPHOLE[Runtime.GlobalFrame[proc]];
pc _ [0];
IF gfh # NIL THEN {
ep: CARDINAL _ LOOPHOLE[proc, PrincOps.ControlLink].ep;
ev: LONG POINTER TO PrincOps.CSegPrefix _  LOOPHOLE[gfh.code.longbase];
pc _ [ev.entry[ep].initialpc*2];
code _ ev;
};
};

FindAny: PROC
[target: CARD _ 0, oneShot: BOOL _ FALSE, delta: CARD _ 360] = {
ENABLE ANY => GO TO dont;
proc: UNSPECIFIED _ ViewerOps.OpenIcon;
code: LONG POINTER;
pc: PrincOps.BytePC;
data: LocalData _ NIL;
Setup[];
[code, pc] _ ProcToCodeAndPC[proc];
pc _ [pc+5]; -- crock! to get at frame after arguments
IF target = 0 THEN target _ System.SecondsSinceEpoch[Time.Current[]];
data _ NEW[LocalDataRep _ [
next: NIL, id: NIL, viewer: NIL,
oneShot: oneShot, targetStart: target, targetEnd: target+delta]];
data.id _ FastBreak.SetFastBreak[code, pc, HandleCacheChange, LOOPHOLE[data]];
data.next _ setList;
setList _ data;
EXITS
dont => {};
}; 

FindIt: PROC [name: ROPE, delta: CARD _ 0, oneShot: BOOL _ FALSE] = {
ENABLE ANY => GO TO dont;
viewer: ViewerClasses.Viewer _ ViewerOps.FindViewer[name];
proc: UNSPECIFIED _ ViewerOps.OpenIcon;
code: LONG POINTER;
pc: PrincOps.BytePC;
data: LocalData _ NIL;
Setup[];
delta _ System.SecondsSinceEpoch[Time.Current[]] + delta;
IF viewer = NIL OR NOT viewer.iconic THEN RETURN;
[code, pc] _ ProcToCodeAndPC[proc];
pc _ [pc+5]; -- crock! to get at frame after arguments
data _ NEW[LocalDataRep _ [
next: NIL, id: NIL, viewer: viewer,
oneShot: oneShot, targetStart: delta]];
data.id _ FastBreak.SetFastBreak[code, pc, HandleCacheChange, LOOPHOLE[data]];
data.next _ setList;
setList _ data;
EXITS
dont => {};
}; 

NameIt: PROC [name: ROPE] = {
viewer: ViewerClasses.Viewer _ ViewerOps.FindViewer[name];
IF viewer = NIL OR NOT viewer.iconic THEN RETURN;
DoIt[viewer];
ViewerOps.PaintViewer[viewer, all];
}; 

DoIt: PROC [viewer: ViewerClasses.Viewer] = {
x: INTEGER _ viewer.wx;
midWay: INTEGER _ UserTerminal.screenWidth/2;
vx: INTEGER _ (midWay - x)/initialSteps;
y: INTEGER _ viewer.wy;
oldPriority: Process.Priority _ Process.GetPriority[];
nextG: INTEGER _ invG;
useIcon: BOOL _ viewer.icon < private;
oldInterrupt: UNSPECIFIED _ SDDefs.SD[SDDefs.sInterrupt]; 
oldCallDebugger: UNSPECIFIED _ SDDefs.SD[SDDefs.sCallDebugger]; 
oldWorryCallDebugger: UNSPECIFIED _ SDDefs.SD[SDDefs.sWorryCallDebugger];
startTime: System.GreenwichMeanTime _ Time.Current[];
last: BOOL _ FALSE;
maxX: INTEGER = UserTerminal.screenWidth - (IF pieces THEN pieceSize ELSE iconSize);
minY: INTEGER = IF pieces THEN pieceSize/2 ELSE iconSize/2;
maxY: INTEGER = UserTerminal.screenHeight;
lastTime: INT _ maxTime;
needErase: BOOL _ FALSE;

IF NOT viewer.iconic THEN RETURN;

IF lockup THEN {
SDDefs.SD[SDDefs.sInterrupt] _ FlushCache;
SDDefs.SD[SDDefs.sCallDebugger] _ FlushCache;
SDDefs.SD[SDDefs.sWorryCallDebugger] _ FlushCache};

Setup[];
IF useIcon
THEN Icons.DrawIcon[viewer.icon, iconCtx, 0, 0, viewer.name]
ELSE viewer.class.paint[viewer, iconCtx, NIL, FALSE];

Process.SetPriority[ProcessPriorities.priorityClientHigh];
ViewerOps.WaitForPaintingToFinish[];
ViewerOps.GreyScreen[x, y, iconSize, iconSize, FALSE, TRUE];  -- wipe out the old icon
IF lockup THEN {
ViewerOps.DisablePainting[];
ViewerOps.WaitForPaintingToFinish[]};

SELECT vx FROM
< 0 => vx _ vx - 1;
> 0 => vx _ vx + 1;
ENDCASE;
DO
oldX: INTEGER _ x;
oldY: INTEGER _ y;
last: BOOL _ FALSE;
x _ x + vx;
y _ y + 2;
SELECT vx FROM
> 0 => IF x > midWay THEN x _ midWay;
< 0 => IF x < midWay THEN x _ midWay;
ENDCASE;

IF x = midWay OR y > 500
THEN last _ TRUE
ELSE {
Graphics.SetCP[ctx, x, y+iconSize];
GraphicsOps.DrawBitmap[ctx, base, iconSize, iconSize, 0, 0];
};

IF needErase THEN {
Graphics.SetCP[ctx, oldX, oldY+iconSize];
GraphicsOps.DrawBitmap[ctx, base, iconSize, iconSize, 0, 0];
};

needErase _ TRUE;
UserTerminal.WaitForScanLine[0];
IF last THEN EXIT;
ENDLOOP;
FOR i: NAT IN [0..maps.len) DO
map: Map _ maps[i];
map.xpos _ map.xpos + x;
map.ypos _ map.ypos + y + iconSize;
maps[i] _ map;
ENDLOOP;

FOR i: NAT IN [0..4800) WHILE NOT last DO
current: System.GreenwichMeanTime _ Time.Current[];
delta: INT _ System.SecondsSinceEpoch[current] - System.SecondsSinceEpoch[startTime];
moving: NAT _ maps.len;
above: NAT _ moving;
last _ delta > lastTime;
FOR j: NAT IN [0..moving) DO
map: Map _ maps[j];
oldX: INTEGER _ map.xpos;
oldY: INTEGER _ map.ypos;

IF nextG = i THEN
map.yvel _ map.yvel - 1;
map.xpos _ oldX + map.xvel;
map.ypos _ oldY + map.yvel;
IF bouncingSides THEN
SELECT map.xpos FROM
<= 0 => {map.xvel _ -(map.xvel*3)/absorbing; map.xpos _ 0};
>= maxX => {map.xvel _ -(map.xvel*3)/absorbing; map.xpos _ maxX};
ENDCASE; 
IF bouncingBottom THEN
IF map.ypos <= minY THEN {
map.yvel _ -(map.yvel*3)/absorbing;
map.ypos _ minY;
IF map.yvel = 0 AND map.ypos = minY AND (i MOD 16) = 0 THEN
SELECT map.xvel FROM
< 0 => map.xvel _ map.xvel + 1;
> 0 => map.xvel _ map.xvel - 1;
ENDCASE;
IF map.yvel = 0 AND map.xvel = 0 THEN moving _ moving - 1;
};
IF bouncingTop THEN
IF map.ypos >= maxY THEN {
map.yvel _ -(map.yvel*3)/absorbing;
map.ypos _ maxY};
IF map.ypos < minY THEN above _ above - 1;
maps[j] _ map;

IF NOT last THEN {
Graphics.SetCP[ctx, map.xpos, map.ypos];
IF pieces
THEN GraphicsOps.DrawBitmap[
ctx, base, pieceSize, pieceSize, map.x0, map.y0, map.x0, map.y0]
ELSE GraphicsOps.DrawBitmap[ctx, base, iconSize, iconSize, 0, 0]};

IF i # 0 THEN {
Graphics.SetCP[ctx, oldX, oldY];
IF pieces
THEN GraphicsOps.DrawBitmap[
ctx, base, pieceSize, pieceSize, map.x0, map.y0, map.x0, map.y0]
ELSE GraphicsOps.DrawBitmap[ctx, base, iconSize, iconSize, 0, 0]};

ENDLOOP;
IF nextG = i THEN nextG _ nextG + invG;
THROUGH [0..scanLines) DO UserTerminal.WaitForScanLine[0]; ENDLOOP;
IF moving = 0 OR above = 0 THEN lastTime _ 0;
ENDLOOP;

IF swapPiecesFlag THEN pieces _ NOT pieces;
IF lockup THEN ViewerOps.EnablePainting[];
Process.SetPriority[oldPriority];
ViewerOps.WaitForPaintingToFinish[];
IF lockup THEN {
SDDefs.SD[SDDefs.sInterrupt] _ oldInterrupt;
SDDefs.SD[SDDefs.sCallDebugger] _ oldCallDebugger;
SDDefs.SD[SDDefs.sWorryCallDebugger] _ oldWorryCallDebugger};
};

FlushCache: PROC = {
v: RECORD [a,b: UNSPECIFIED, state: PrincOps.StateVector];
v.state _ STATE;
v.state.dest _ Frame.GetReturnLink[];
v.state.source _ PrincOps.NullLink;
v.state.stkptr _ 0;
RETURN WITH v.state;
};

Setup: ENTRY PROC = {
ENABLE UNWIND => NULL;
IF ctx = NIL THEN {
ctx _ Graphics.NewContext[];
Graphics.SetColor[ctx, Graphics.black];
[] _ Graphics.SetPaintMode[ctx, invert]};
IF base = NIL THEN {
base _ GraphicsOps.NewBitmap[iconSize, iconSize];
hack _ LOOPHOLE[base]};
iconCtx _ GraphicsOps.NewContextFromBitmap[base];
[] _ Graphics.SetPaintMode[iconCtx, opaque];
Graphics.SetColor[iconCtx, Graphics.white];
Graphics.DrawBox[iconCtx, [0, 0, 64, 64]];
Graphics.SetColor[iconCtx, Graphics.black];
FOR i: NAT IN [0..maps.len) DO
row: INTEGER _ i / 8;
col: INTEGER _ i MOD 8;
sum: INTEGER _ row + col;
xvel: INTEGER _ (seedMod/2 - GenRandom[]) * scale;
yvel: INTEGER _ (GenRandom[] + minYvel) * scale;
x0: INTEGER _ col * 8;
y0: INTEGER _ row * 8;
maps[i] _ [x0: x0, y0: y0, xpos: x0, ypos: y0, xvel: xvel, yvel: yvel];
ENDLOOP;
};

seed: CARDINAL _ 123456B;
GenRandom: PROC RETURNS [INTEGER] = {
seed _ seed * 17 + 174653B;
RETURN [(seed / 256) MOD seedMod];
};

END.


�SpecialCache.mesa
Russ Atkinson, July 1, 1983 5:30 pm
Special accelerator cache for BugBane only!
[data: FastBreakData, frame: PrincOps.FrameHandle, sv: PrincOps.SVPointer]
RETURNS [useOldBreak: BOOL _ FALSE]
load the bitmaps with the patterns
move icon to the center

step the position
XOR in the new image
XOR out the original image

init the maps to point at the icon and to have the correct positions
explode the icon in steps
loop each bitmap
step the position
apply a gravity step
friction, of a sort
XOR in the new image
XOR out the original image
cleanup
takes any # of arguments and flushes them
returns pseudo-random number in [0..seedMod)
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