DIRECTORY
Basics					USING [ BITAND, BITSHIFT ],
Atom					USING [ GetPropFromList, PutPropOnList, RemPropFromList ],
Process				USING [ Pause, SecondsToTicks ],
CedarProcess			USING [ Abort, CheckAbort, DoWithPriority, Fork, ForkableProc, Join, Process
								],
ViewerClasses		USING [ Viewer ],
Terminal				USING [ ColorMode, Current, GetColorFrameBufferA,   
  								 GetColorFrameBufferB, GetColorMode, SetColor, SetBlueMap, 
  								 SetGreenMap, SetRedMap, Virtual ],
FS						USING [ ComponentPositions, ExpandName ],
IO						USING [ STREAM  ],
Convert				USING [ RopeFromReal ],
Rope					USING [ Cat, Equal, ROPE, Substr  ] ,
Real					USING [ Float, Fix, Round ],
RealFns				USING [ Power ],
ColorDisplayManager	USING [ Start ], 
Imager				USING [ Context, Rectangle ],
ImagerBackdoor		USING [ AccessBufferRectangle ],
ImagerSample		USING [ Box, GetBase, GetBitsPerLine, GetBox, GetRef, GetSamples,
								 MapFromFrameBuffer, NewSamples,
								 ObtainScratchSamples, PutSamples, RasterSampleMap,
								 ReleaseScratchSamples, SampleBuffer, Transfer,
								 UnsafeNewSampleMap, WordsForLines ],
ImagerPixel			USING [ GetPixels, MakePixelMap, NewPixels, PixelBuffer, PixelMap,
								 PutPixels ],
ThreeDBasics		USING [ Box, ClipState, Context, ContextClass, ContextProc, Create, Error,    
 								 GetDisplayType, ImagerProc, ImagerProcRec, 
								 NatSequence, Pair, PairSequence, Patch, PatchProc, Pixel, Quad,      
								 Rectangle, RegisterDisplayType, RGB, SetView,  
								 ShadingValue, ShapeInstance, ShapeSequence, Triple,
								 TripleSequence, Vertex ], 
SceneUtilities		USING [ GetTmpContext, SetViewPort, SetWindow, StartLog ],
SurfaceRender		USING [ ValidateContext ],
RenderWithPixels	USING [ AntiAliasing, BufferRendering, DepthBuffering, DoRope,    
								 DrawRope, AllocatePixelMemory, Draw2DPoly, Draw2DLine,  
								 FillInBackGround, MakeFrame, PolygonTiler, RopeDesc ],
Animation3D			USING [ MoveCtrOfInterestInOrbit, MoveEyePointInOrbit, MoveOnLine, 
								 MoveOnClosedCurve, MoveOnOpenCurve, ViewProc ],
AISAnimation		USING [ StoreFiles ],
ColorDisplayRender	USING [ ];
ColorDisplayRenderImpl: CEDAR MONITOR
IMPORTS  AISAnimation, Animation3D, Atom, Basics, CedarProcess, ColorDisplayManager, Convert, FS, ImagerBackdoor, ImagerPixel, ImagerSample, Process, Real, RealFns, RenderWithPixels, Rope, SceneUtilities, SurfaceRender, Terminal, ThreeDBasics
EXPORTS ColorDisplayRender

~ BEGIN

ROPE: TYPE ~ Rope.ROPE;
RopeDesc: TYPE ~ RenderWithPixels.RopeDesc;
Context: TYPE ~ ThreeDBasics.Context;
ContextProc: TYPE ~ ThreeDBasics.ContextProc;
ImagerProc: TYPE ~ ThreeDBasics.ImagerProc;
ContextClass: TYPE ~ ThreeDBasics.ContextClass;
Box: TYPE ~ ThreeDBasics.Box;
Rectangle: TYPE ~ ThreeDBasics.Rectangle;
Triple: TYPE ~ ThreeDBasics.Triple;
TripleSequence: TYPE ~ ThreeDBasics.TripleSequence;
RGB: TYPE ~ ThreeDBasics.RGB;
Pixel: TYPE ~ ThreeDBasics.Pixel;
Pair: TYPE ~ ThreeDBasics.Pair;
PairSequence: TYPE ~ ThreeDBasics.PairSequence;
IntRGB: TYPE ~ RECORD[ r, g, b: CARDINAL];
IntRGBSequence: TYPE ~RECORD [ SEQUENCE length: NAT OF IntRGB ];
NatSequence: TYPE ~ ThreeDBasics.NatSequence;
Patch: TYPE ~ ThreeDBasics.Patch;
PatchProc: TYPE ~ ThreeDBasics.PatchProc;
ClipState: TYPE ~ ThreeDBasics.ClipState;
PixelBuffer: TYPE ~ ImagerPixel.PixelBuffer;
PixelMap: TYPE ~ ImagerPixel.PixelMap;
ImagerProcRec: TYPE ~ ThreeDBasics.ImagerProcRec;
timeResolution: CARD16 _ 3;
Ceiling: PROC[number: REAL] RETURNS[result: INTEGER] ~ {
result _ Real.Round[number];
IF result < number THEN result _ result + 1;
};

Floor: PROC[ in: REAL ] RETURNS[ out: INTEGER ] ~ {
out _ Real.Round[in];
IF Real.Float[out] > in THEN out _ out - 1; 
};

UpdateFullColorDisplay: PROC [context: REF Context] ~ {
screenPixels: PixelMap _ NARROW[Atom.GetPropFromList[context.displayProps, $ScreenPixels]];
xMin: NAT _ context.pixels.box.min.f;
width: NAT _ context.pixels.box.max.f-xMin; 
buf1: ImagerSample.SampleBuffer _ ImagerSample.ObtainScratchSamples[width];
buf2: ImagerSample.SampleBuffer _ ImagerSample.ObtainScratchSamples[width];
DoUpdateFullColorDisplay[context, screenPixels, buf1, buf2, xMin, width];
ImagerSample.ReleaseScratchSamples[buf1];
ImagerSample.ReleaseScratchSamples[buf2];
};

PeriodicUpdateFullColorDisplay: CedarProcess.ForkableProc ~ {
context: REF Context _ NARROW[data];
screenPixels: PixelMap _ NARROW[Atom.GetPropFromList[context.displayProps, $ScreenPixels]];
xMin: NAT _ context.pixels.box.min.f;
width: NAT _ context.pixels.box.max.f-xMin; 
waitTime: CARD16 _ timeResolution*3;
buf1: ImagerSample.SampleBuffer _ ImagerSample.NewSamples[width];
buf2: ImagerSample.SampleBuffer _ ImagerSample.NewSamples[width];
DO				-- stuff buffered pixels onto screen every waitTime seconds
Process.Pause[Process.SecondsToTicks[waitTime]];
DoUpdateFullColorDisplay[context, screenPixels, buf1, buf2, xMin, width];
CedarProcess.CheckAbort[ ];
ENDLOOP;
};

DoUpdateFullColorDisplay: PROC [
context: REF Context,
screenPixels: PixelMap,
buf1, buf2: ImagerSample.SampleBuffer,
xMin, width: NAT]
~ {
IF screenPixels # NIL 
THEN FOR i: NAT IN [context.pixels.box.min.s..context.pixels.box.max.s) DO
ImagerSample.GetSamples[
map: context.pixels[0], initIndex: [i, xMin], buffer: buf1, count: width];
ImagerSample.GetSamples[
map: context.pixels[1], initIndex: [i, xMin], buffer: buf2, count: width];
ImagerSample.PutSamples[
map: screenPixels[0], initIndex: [i, 2*xMin], buffer: buf1, delta: [0, 2], count: width];
ImagerSample.PutSamples[
map: screenPixels[0], initIndex: [i, 1+2*xMin], buffer: buf2, delta: [0, 2], count: width];
ENDLOOP;
};

UpdateViewer: CedarProcess.ForkableProc ~ {	-- updates viewer from buffered pixel map 
context: REF Context _ NARROW[data];
waitTime: CARD16 _ IF context.class.displayType = $FullColor THEN timeResolution * 3 
																	    ELSE timeResolution;
WHILE TRUE DO			-- stuff buffered pixels onto screen every waitTime seconds
Process.Pause[ Process.SecondsToTicks[waitTime] ];
context.class.drawInViewer[ context, NEW[ImagerProcRec _ [StuffBuf, NIL]] ];
CedarProcess.CheckAbort[ ];
ENDLOOP;
};
GetDisplay: ContextProc ~ {	
IF context.viewer # NIL 
THEN {
context.class.updateViewer[ context ];
RenderWithPixels.AllocatePixelMemory[context];
}
ELSE GrabColorDisplay[context];				-- clear off color display and take it over

SELECT context.class.displayType FROM
$FullColor, $Gray	=> {
LoadColorRamp[ context.terminal, [0.,0.,0.], [1.,1.,1.], [.43, .43, .43] ];
};
$PseudoColor	=> {
LoadStd8BitClrMap[context.terminal];
};
ENDCASE => SIGNAL ThreeDBasics.Error[[$MisMatch, "Unexpected displayType"]];
context.pixelAspectRatio _ 1.0;			-- standard square-pixel display assumed
context.displayInValid _ TRUE;
};


GrabColorDisplay: PROC[ context: REF Context ] ~ {	
vt: Terminal.Virtual;
box: ImagerSample.Box;
s0, s2: ImagerSample.RasterSampleMap _ NIL;
clrType: ATOM;
IF context.terminal = NIL 
THEN context.terminal _ vt _ Terminal.Current[]
ELSE  vt _ context.terminal;
SELECT context.class.displayType FROM
$PseudoColor	=> clrType _ $Dither8;
$Gray			=> clrType _ $Gray8; 
$FullColor	=> clrType _ $FullColor;
ENDCASE	=> SIGNAL ThreeDBasics.Error[[$MisMatch, "Unexpected Display type"]];
ColorDisplayManager.Start[
type: clrType, 	-- ATOM, Colordisplay types: $Gray8, $Dither8, $Dither1, $FullColor
side: left, 		-- Interminal.Side {left, right}
level: mouse, 	-- ColorDisplayManager.Level ~ {off, allocated, visible, mouse, viewers}
resolution: none	-- ColorDisplayDefs.ColorDisplayType {none, standard, highResolution}
];
SELECT context.class.displayType FROM
$FullColor	=> {
s0 _ ImagerSample.MapFromFrameBuffer[vt.GetColorFrameBufferA[]];	-- 16 bits, R&G
s2 _ ImagerSample.MapFromFrameBuffer[vt.GetColorFrameBufferB[]];	-- 8 bits, B
};
$PseudoColor, $Gray	=> 
s0 _ ImagerSample.MapFromFrameBuffer[vt.GetColorFrameBufferA[]];
ENDCASE	=> SIGNAL ThreeDBasics.Error[[$MisMatch, "Unexpected Display type"]];
box _ ImagerSample.GetBox[s0];					-- get frame buffer size
RenderWithPixels.AllocatePixelMemory[context];
IF context.class.displayType = $FullColor THEN {
screenPxls: PixelMap;
TRUSTED { 
screenPxls _ ImagerPixel.MakePixelMap[
ImagerSample.UnsafeNewSampleMap[
box: [box.min, [box.max.s, 2 * box.max.f]], 
bitsPerSample: 8,
bitsPerLine: ImagerSample.GetBitsPerLine[s0],
base: ImagerSample.GetBase[s0],
ref: ImagerSample.GetRef[s0],
words: ImagerSample.WordsForLines[ box.max.s, ImagerSample.GetBitsPerLine[s0] ]
]
];
};
context.displayProps _ Atom.PutPropOnList[context.displayProps, $ScreenPixels, screenPxls];
};

IF s0 # NIL THEN context.pixels[0] _ s0;		-- on-screen mem (pseudoclr, grey, 16-bit R&G)
IF s2 # NIL THEN context.pixels[2] _ s2;		-- on-screen mem (Blue record for full-color)

context.viewPort _ NIL;
context.window _ NIL;
};

ValidateDisplay: ContextProc ~{			-- update viewPort, etc.
IF context.viewer # NIL THEN {
IF Atom.GetPropFromList[ context.displayProps, $ViewerAdjusted ] # NIL
THEN context.class.drawInViewer[context, NIL];		-- get specs for new viewer
IF context.pixels = NIL OR context.pixels.samplesPerPixel = 1 
THEN context.class.updateViewer[ context ];			-- drawing directly on screen
context.stopMe^ _ FALSE;				-- make sure stop button is released
};
IF context.pixels # NIL 			-- check for mismatched viewPort and pixel storage
THEN IF context.pixels.box.max.f < context.viewPort.w 
		  OR context.pixels.box.max.s < context.viewPort.h 
THEN RenderWithPixels.AllocatePixelMemory[context];
};

Init: PROC[] ~ {							-- register Imager-based drawing types
standardClass: ContextClass _ [
displayType: $PseudoColor,  
setUpDisplayType: GetDisplay,
validateDisplay: ValidateDisplay,
render: MakeFrame,
loadBackground: FillInBackGround,
draw2DLine: Draw2DLine,
draw2DPolygon: Draw2DPoly,
draw2DRope: Draw2DRope,
displayPolygon: PolygonTiler	
];
ThreeDBasics.RegisterDisplayType[ standardClass, $PseudoColor ];

standardClass.displayType _ $FullColor;
ThreeDBasics.RegisterDisplayType[ standardClass, $FullColor ];

standardClass.displayType _ $Gray;
ThreeDBasics.RegisterDisplayType[ standardClass, $Gray ];
};
MappedRGB: PUBLIC PROC[context: REF Context, clr: Pixel] RETURNS[Pixel] ~ {
SELECT context.class.displayType FROM	
$ImagerDithered		=> {
mapVal: NAT _  24 * (clr[r]*5 / 256)  + 4 * (clr[g]*6 / 256)  + (clr[b]*4 / 256);
IF mapVal >= 60 THEN mapVal _ mapVal + 135;			-- move to top of map
clr[r] _ mapVal;
};
$PseudoColor	=> clr[r] _ 42 * (clr[r]*6 / 256) + 6 * (clr[g]*7 / 256) + (clr[b]*6 / 256) +2;
$Gray	=> clr[r] _ ( clr[r]  + clr[g] + clr[b] ) / 3; 
ENDCASE;				-- ignore other modes
RETURN[ clr ];
};

LoadStd8BitClrMap: PUBLIC PROC [vt: Terminal.Virtual] ~ {
Linearize: PROC [value: REAL] RETURNS[NAT] ~ {
RETURN[ Real.Round[RealFns.Power[value / 255.0, .43] * 255.0] ];
};
IF vt = NIL THEN vt _ Terminal.Current[];
vt.SetColor[0, 0, 0, 0, 0];    vt.SetColor[1, 0, 0, 0, 0];
FOR i: NAT IN [2..254) DO  									-- 6 x 7 x 6 color cube
j: NAT _ i - 2;
red: NAT _ Linearize[51.0 * (j/42)]; 
grn: NAT _ Linearize[42.5 * ((j/6) MOD 7)]; 
blu: NAT _ Linearize[51.0 * (j MOD 6)]; 
vt.SetColor[i, 0, red, grn, blu];
ENDLOOP;
vt.SetColor[254, 0, 255, 255, 255];    vt.SetColor[255, 0, 255, 255, 255]; 
};
LoadColorRamp: PUBLIC PROC [vt: Terminal.Virtual, clr1: RGB _ [0,0,0], 
									 clr2: RGB _ [255,255,255], exponent: RGB _ [.43,.43,.43] ] ~ {
state: Terminal.ColorMode;
maxVal: REAL;
IF vt = NIL THEN vt _ Terminal.Current[];
state _ vt.GetColorMode[];
maxVal _ IF state.full 
THEN 255.0 
ELSE Real.Float[Basics.BITSHIFT[1, state.bitsPerPixelChannelA] - 1];
clr1.R _ MAX[0.0, MIN[1.0, clr1.R]];	clr2.R _ MAX[0.0, MIN[1.0, clr2.R]];
clr1.G _ MAX[0.0, MIN[1.0, clr1.G]];	clr2.G _ MAX[0.0, MIN[1.0, clr2.G]];
clr1.B _ MAX[0.0, MIN[1.0, clr1.B]];	clr2.B _ MAX[0.0, MIN[1.0, clr2.B]];

FOR i: NAT IN [ 0 .. INTEGER[Real.Fix[maxVal]] ] DO  		-- linear ramp exponentiated
jr: [0..256) _ Real.Fix[
			    RealFns.Power[clr1.R + i/maxVal * (clr2.R - clr1.R), exponent.R] * maxVal];
jg: [0..256) _ Real.Fix[
			   RealFns.Power[clr1.G + i/maxVal * (clr2.G - clr1.G), exponent.G] * maxVal];
jb: [0..256) _ Real.Fix[
				RealFns.Power[clr1.B + i/maxVal * (clr2.B - clr1.B), exponent.B] * maxVal];
IF Terminal.GetColorMode[vt].full 
THEN {  vt.SetRedMap[i, jr];    vt.SetGreenMap[i, jg];    vt.SetBlueMap[i, jb];  }
ELSE vt.SetColor[i, 0, jr, jg, jb]; 
ENDLOOP;
};
FillInBackGround: ContextProc ~ {
IF context.viewer # NIL 											-- do through viewer
THEN context.class.drawInViewer[context, NEW[ImagerProcRec _ [ViewerBackFill, NIL]]]
ELSE RenderWithPixels.FillInBackGround[context];			-- clear directly
};
	
ViewerBackFill: ImagerProc ~ {		-- get pixelmap into context and then do it
DoFillInBackGround: PROC[pixelMap: PixelMap] ~ {
tempPixels: PixelMap _ context.pixels;    tempViewPort: Rectangle _ context.viewPort^;
context.pixels _ pixelMap;    
context.viewPort.x _ context.viewPort.x + pixelMap.box.min.f;		-- adjust to device coords
context.viewPort.y _ context.viewPort.y + pixelMap.box.min.s;
RenderWithPixels.FillInBackGround[context];
context.pixels _ tempPixels;    context.viewPort^ _ tempViewPort;
};
ImagerBackdoor.AccessBufferRectangle[imagerCtx, DoFillInBackGround, context.viewPort^];
};

Draw2DLine: PROC[context: REF Context, p1, p2: Pair, color: Pixel] ~ {
mapClr: Pixel _ MappedRGB[context, color];
IF context.viewer # NIL 										 			-- do through viewer
THEN {
data: REF LineDesc _ NEW[LineDesc _ [p1, p2, mapClr] ];
context.class.drawInViewer[context, NEW[ImagerProcRec _ [ViewerLine, data]]];
}
ELSE RenderWithPixels.Draw2DLine[context, p1, p2, mapClr];		-- do directly
};

LineDesc: TYPE ~ RECORD[p1, p2: Pair, color: Pixel];
ViewerLine: ImagerProc ~ {		-- get pixelmap into context and then do it
DoDrawLine: PROC[pixelMap: PixelMap] ~ {
desc: REF LineDesc _ NARROW[data];
tempPixels: PixelMap _ context.pixels;    context.pixels _ pixelMap;
RenderWithPixels.Draw2DLine[context, desc.p1, desc.p2, desc.color];
context.pixels _ tempPixels;
};
ImagerBackdoor.AccessBufferRectangle[imagerCtx, DoDrawLine, context.viewPort^];
};

Draw2DPoly: PROC[context: REF Context, poly: REF PairSequence, color: Pixel] ~ {
mapClr: Pixel _ MappedRGB[context, color];
IF context.viewer # NIL 											-- do through viewer
THEN {
data: REF PolyDesc _ NEW[PolyDesc _ [poly, mapClr] ];
context.class.drawInViewer[context, NEW[ImagerProcRec _ [Viewer2DPoly, data]]];
}
ELSE RenderWithPixels.Draw2DPoly[context, poly, mapClr];			-- do directly
};

PolyDesc: TYPE ~ RECORD[poly: REF PairSequence, color: Pixel];
Viewer2DPoly: ImagerProc ~ {			-- get pixelmap into context and then do it
DoDraw2DPoly: PROC[pixelMap: PixelMap] ~ {
desc: REF PolyDesc _ NARROW[data];
tempPixels: PixelMap _ context.pixels;    context.pixels _ pixelMap;
RenderWithPixels.Draw2DPoly[context, desc.poly, desc.color];
context.pixels _ tempPixels;
};
ImagerBackdoor.AccessBufferRectangle[imagerCtx, DoDraw2DPoly, context.viewPort^];
};

PolygonTiler: PatchProc ~ {
IF context.viewer # NIL 											-- do through viewer
THEN {
plyData: REF PolygonDesc _ NEW[PolygonDesc _ [patch, data] ];
context.class.drawInViewer[context, NEW[ImagerProcRec _ [ViewerTiler, plyData]]];
}
ELSE {
[] _ RenderWithPixels.PolygonTiler[context, patch, data];			-- do directly
};
RETURN[NIL];
};

PolygonDesc: TYPE ~ RECORD[patch: REF Patch, data: REF ANY];
ViewerTiler: ImagerProc ~ {				-- get pixelmap into context and then do it
DoPolygonTiler: PROC[pixelMap: PixelMap] ~ {
desc: REF PolygonDesc _ NARROW[data];
tempPixels: PixelMap _ context.pixels;    
context.pixels _ pixelMap;
[] _ RenderWithPixels.PolygonTiler[context, desc.patch, desc.data];
context.pixels _ tempPixels;
};
ImagerBackdoor.AccessBufferRectangle[imagerCtx, DoPolygonTiler, context.viewPort^];
};

Draw2DRope: PUBLIC PROC[context: REF Context, rope: ROPE,  position: Pair, 
							color: Pixel _ [255,255,255,0,0], size: REAL _ 20, font: ROPE _ NIL] ~ {
IF context.viewer = NIL
THEN RenderWithPixels.DrawRope[context, rope, position, color, size, font]
ELSE {
ropeData: REF RopeDesc _ NEW[ RopeDesc _ [rope, position, color, size, font] ];
context.class.drawInViewer[ 
context, 
NEW[ImagerProcRec _ [RenderWithPixels.DoRope, ropeData]] 
];
};
};

MakeFrame: PUBLIC ContextProc ~ {
refreshProc: CedarProcess.Process _ NIL;
tmpViewer: ViewerClasses.Viewer;
tmpContext: REF Context;

SurfaceRender.ValidateContext[context];	-- ensures viewer, viewPort and pixel store updated
IF context.viewer # NIL 
THEN tmpContext _ SceneUtilities.GetTmpContext[context]	-- get modifiable context
ELSE  tmpContext _ context;				-- drawing into memory or directly on display
{  ENABLE UNWIND => CedarProcess.Abort[refreshProc];	-- in case of aborts, etc.
IF NOT tmpContext.doVisibly							 -- buffering, copy over when done
THEN {tmpViewer _ tmpContext.viewer; tmpContext.viewer _ NIL}
ELSE IF tmpContext.viewer # NIL AND tmpContext.pixels # NIL 
  AND tmpContext.pixels.samplesPerPixel > 1 THEN {
refreshProc _ CedarProcess.Fork[UpdateViewer, context];	-- start refresh
tmpViewer _ tmpContext.viewer;    tmpContext.viewer _ NIL;
};
IF Atom.GetPropFromList[ context.displayProps, $ScreenPixels ] # NIL -- full color, no vwr
THEN refreshProc _ CedarProcess.Fork[PeriodicUpdateFullColorDisplay, context];
RenderWithPixels.MakeFrame[tmpContext];
};
IF refreshProc # NIL THEN CedarProcess.Abort[refreshProc];		-- kill periodic update
IF NOT tmpContext.doVisibly OR tmpViewer # NIL THEN {
tmpContext.viewer _ tmpViewer;
context.class.drawInViewer[ tmpContext, NEW[ImagerProcRec _ [StuffBuf, NIL]] ];
};
IF refreshProc # NIL THEN {
[] _ CedarProcess.Join[refreshProc];	-- wait for refreshProc done
UpdateFullColorDisplay[context];
};
};

StuffBuf: PUBLIC ImagerProc ~ {
DoTransfer: PROC[pixelMap: PixelMap] ~ {  
FOR i: NAT IN [0..samplesPerColor) DO
ImagerSample.Transfer[dst: pixelMap[i], src: context.pixels[i], delta: pixelMap.box.min]; 
ENDLOOP;
};
samplesPerColor: NAT _ IF context.class.displayType = $FullColor THEN 3 ELSE 1;
ImagerBackdoor.AccessBufferRectangle[imagerCtx, DoTransfer, context.viewPort^];
};

MakeHiResFrame: PUBLIC PROC[ context: REF Context, width, height: NAT, name: ROPE, 
									   keepLog: BOOLEAN _ TRUE ] ~ {
hiResCtxt: REF Context _ SceneUtilities.GetTmpContext[context];
hiResCtxt.viewer _ NIL;
hiResCtxt.viewPort _ NEW[ 					-- set viewport directly to define pixelMap size
Imager.Rectangle  _ [ x: 0.0, y: 0.0, w: Real.Float[width], h: Real.Float[height] ]
];
RenderWithPixels.AllocatePixelMemory[hiResCtxt];					-- get display memory
SceneUtilities.SetViewPort[ hiResCtxt, [0.0, 0.0, Real.Float[width], Real.Float[height]] ];
hiResCtxt.class.render _ RenderWithPixels.MakeFrame;		-- load direct memory procs
hiResCtxt.class.displayPolygon _ RenderWithPixels.PolygonTiler;
IF context.antiAliasing THEN RenderWithPixels.AntiAliasing[hiResCtxt];	-- get state straight
IF context.depthBuffering THEN RenderWithPixels.DepthBuffering[hiResCtxt];

IF keepLog THEN [] _ SceneUtilities.StartLog[hiResCtxt];
FOR i: NAT IN [0..hiResCtxt.shapes.length) DO 
hiResCtxt.shapes[i].vtcesInValid _ TRUE;
ENDLOOP;
hiResCtxt.class.render[hiResCtxt];
AISAnimation.StoreFiles[hiResCtxt, name ];							-- store resulting image
};

DitherImage: PUBLIC PROC[dstContext, rgbContext: REF Context] ~ {
Action: PROC ~ {
width: NAT _ Real.Fix[MIN[dstContext.viewPort.w, rgbContext.viewPort.w] ];
height: NAT _ Real.Fix[MIN[dstContext.viewPort.h, rgbContext.viewPort.h] ];
scanSegIn: PixelBuffer _ ImagerPixel.NewPixels[rgbContext.pixels.samplesPerPixel, width];
scanSegOut: PixelBuffer _ ImagerPixel.NewPixels[dstContext.pixels.samplesPerPixel, width];
IF rgbContext.pixels.samplesPerPixel < 3 
THEN SIGNAL ThreeDBasics.Error[[$MisMatch, "24-bit input needed for dithering"]];
FOR y: NAT IN [0..height) DO
ImagerPixel.GetPixels[										-- get rgb pixels
self: rgbContext.pixels, pixels: scanSegIn, initIndex: [f: 0, s: y], count: width ];
ImagerPixel.GetPixels[										-- get rgb pixels
self: dstContext.pixels, pixels: scanSegOut, initIndex: [f: 0, s: y], count: width ];
FOR x: NAT IN [0..width) DO
scanSegOut[0][x] _ DitheredRGB[$PseudoColor, x, y, 
									  scanSegIn[0][x], scanSegIn[1][x], scanSegIn[2][x] ];
ENDLOOP;
ImagerPixel.PutPixels[										-- store result in foreground
self: dstContext.pixels, pixels: scanSegOut, initIndex: [f: 0, s: y], count: width ];
ENDLOOP;
};
CedarProcess.DoWithPriority[background, Action];				-- be nice to other processess
};

ditherTable: ARRAY [0..4) OF ARRAY [0..4) OF NAT _ 
													[[0,12,3,15], [8,4,11,7], [2,14,1,13], [10,6,9,5]];
DitheredRGB: PROC[renderMode: ATOM, x, y, red, grn, blu: INTEGER] RETURNS[INTEGER] ~ {
val2R, val2G, val2B, pixelValue: NAT;
SELECT renderMode FROM
$PseudoColor	=> {
threshold: NAT _ ditherTable[ Basics.BITAND[x,3] ][ Basics.BITAND[y,3] ];
valR: NAT _ Basics.BITSHIFT[ Basics.BITSHIFT[red,2] + red, -4 ];		-- (red * 5) / 16
valG: NAT _ Basics.BITSHIFT[ Basics.BITSHIFT[grn,2] + Basics.BITSHIFT[grn,1], -4 ];
valB: NAT _ Basics.BITSHIFT[ Basics.BITSHIFT[blu,2] + blu, -4 ];		-- (blu * 5) / 16
val2R _ Basics.BITSHIFT[valR,-4];    										-- valR / 16
IF Basics.BITAND[valR,15] > threshold THEN val2R _ val2R + 1;		-- valr MOD 16
val2G _ Basics.BITSHIFT[valG,-4];    
IF Basics.BITAND[valG,15] > threshold THEN val2G _ val2G + 1;
val2B _ Basics.BITSHIFT[valB,-4];    
IF Basics.BITAND[valB,15] > threshold THEN val2B _ val2B + 1;
RETURN[ MIN[ 255, 
 Basics.BITSHIFT[val2R,5] + Basics.BITSHIFT[val2R,3] + Basics.BITSHIFT[val2R,1] 
+ Basics.BITSHIFT[val2G,2] + Basics.BITSHIFT[val2G,1] 
+ val2B + 2 ] ];					--val2R*42 + val2G*6 + val2B + 2
};
$ImagerDithered	=> {
threshold: NAT _ ditherTable[x MOD 4][y MOD 4];
valR: NAT _ 4* red / 16;
valG: NAT _ 5* grn / 16;
valB: NAT _ 3* blu / 16;
val2R _ valR/16;    IF valR MOD 16 > threshold THEN val2R _ val2R + 1;
val2G _ valG/16;    IF valG MOD 16 > threshold THEN val2G _ val2G + 1;
val2B _ valB/16;    IF valB MOD 16 > threshold THEN val2B _ val2B + 1;
pixelValue _ val2R*24 + val2G*4 + val2B;
IF pixelValue >= 60 THEN pixelValue _ pixelValue + 135;		-- move to top of map
RETURN[ MIN[255, pixelValue] ];
}; 
ENDCASE	=> SIGNAL ThreeDBasics.Error[[$MisMatch, "Unexpected display type"]];
RETURN[ 255 ];
};

NotRGB: PROC[fileRoot: Rope.ROPE] RETURNS[BOOLEAN] ~ {	-- not an RGB file name?
cp: FS.ComponentPositions;  fullFName, ext: Rope.ROPE;
[fullFName, cp, ] _ FS.ExpandName[fileRoot];		
ext _ Rope.Substr[ fullFName, cp.ext.start, cp.ext.length];
IF Rope.Equal[ext, "rgb", FALSE] THEN RETURN[FALSE] ELSE RETURN[TRUE];
};

NewFrame: ENTRY Animation3D.ViewProc ~ {
ENABLE UNWIND => NULL;
filename: ROPE _ NARROW[Atom.GetPropFromList[context.props, $OutputFile]];

ThreeDBasics.SetView[ context, lookingFrom, lookingAt, context.fieldOfView,
						  context.rollAngle, context.upDirection, 
						  context.hitherLimit, context.yonLimit ];

context.class.render[context];		-- make frame
IF context.stopMe^ THEN RETURN[];
CedarProcess.CheckAbort[];			-- check for external abort request before proceeding

IF filename # NIL THEN 				-- if storing frames
IF context.class.displayType = $FullColor AND NotRGB[filename]
THEN { 									-- dither to 8 bits per pixel for storage savings
ditherContext: REF Context _ NARROW[
Atom.GetPropFromList[context.props, $DitherContext]
];
DitherImage[ditherContext, context];
AISAnimation.StoreFiles[ditherContext, filename, frameNo];
}
ELSE AISAnimation.StoreFiles[context, filename, frameNo];
};

SetUpAnimation: PROC[ context: REF Context, filename: ROPE _ NIL ] ~ {
context.stopMe^ _ FALSE;												-- clear stop flag
IF context.preferredRenderMode = $Imager OR filename # NIL -- using imager / writing files
THEN RenderWithPixels.BufferRendering[context, FALSE]; 	-- then draw on screen
IF filename # NIL THEN {
context.props _ Atom.PutPropOnList[context.props, $OutputFile, filename];
IF context.class.displayType = $FullColor
THEN IF NotRGB[filename]
THEN {
ditherContext: REF Context _ ThreeDBasics.Create[];
ditherContext.class _ NEW[
ContextClass _ ThreeDBasics.GetDisplayType[$PseudoColor]
];
SurfaceRender.ValidateContext[context];			-- get everything straight
ditherContext.viewPort _ context.viewPort;
RenderWithPixels.AllocatePixelMemory[ditherContext];
context.props _ Atom.PutPropOnList[context.props, $DitherContext, ditherContext];
}
ELSE {					-- file being prepared for Abekas
context.viewPort _ NEW[Imager.Rectangle  _ [ 0.0, 0.0, 720.0, 486.0 ]]; 
RenderWithPixels.AllocatePixelMemory[context]; -- get buffer memory of right size
SceneUtilities.SetViewPort[ context, [0.0, 0.0, 720.0, 486.0] ];
SceneUtilities.SetWindow[context, [x: -1.0, y: -0.75, w: 2.0, h: 1.5] ];
context.pixelAspectRatio _ (4.0/3.0) / (720.0/486.0);		-- pixel width/height 
};
};
};

FinishAnimation: PROC[ context: REF Context ] ~ {
context.props _ Atom.RemPropFromList[context.props, $OutputFile];
context.props _ Atom.RemPropFromList[context.props, $DitherContext];
};

Orbit: PUBLIC PROC[ context: REF Context, lookingFrom, lookingAt, axis, base: Triple, 
					    moveEPNotCI: BOOLEAN _ TRUE, 
					    framesPerRev: NAT _ 16, startAt: NAT _ 0, endAt: NAT _ 32767,
					    filename: ROPE _ NIL ] ~ {
ENABLE UNWIND => NULL;
SetUpAnimation[context, filename];

IF moveEPNotCI 
THEN Animation3D.MoveEyePointInOrbit[ 
context, lookingFrom, lookingAt, axis, base, 
NewFrame, framesPerRev, startAt, endAt 
]
ELSE Animation3D.MoveCtrOfInterestInOrbit[ 
context, lookingFrom, lookingAt, axis, base,  
NewFrame, framesPerRev, startAt, endAt 
];
FinishAnimation[context];
};

MakeFramesFromTo: PUBLIC PROC[context: REF Context, 
								lookingFrom, lookingAt, toLookingFrom, toLookingAt: Triple,  
								framesOnLine: NAT, startAt, endAt: NAT _ 0, 
								filename: ROPE _ NIL] ~ {
ENABLE UNWIND => NULL;
SetUpAnimation[context, filename];

IF endAt = 0 THEN endAt _ framesOnLine;			-- default is full number of frames
Animation3D.MoveOnLine[  context, 
								lookingFrom, lookingAt, toLookingFrom, toLookingAt,
								NewFrame, framesOnLine, startAt, endAt ];
FinishAnimation[context];
};

TripletoRope: PROC[ r: Triple] RETURNS[ROPE] ~ {
rope: ROPE;
rope _ Rope.Cat[ " ", Convert.RopeFromReal[r.x], " ", Convert.RopeFromReal[r.y] ]; 
rope _ Rope.Cat[ rope, " ", Convert.RopeFromReal[r.z], " " ];
RETURN[ rope ];
};

MakeFramesOnPath: PUBLIC PROC[ context: REF Context, 
										   lookingFrom, lookingAt: LIST OF Triple,  
										   framesOnPath: NAT, startAt, endAt: NAT _ 0, 
										   filename: ROPE _ NIL, closed: BOOLEAN _ TRUE ] ~ {
ENABLE UNWIND => NULL;
ExpandSequence: PROC[seq: REF TripleSequence] ~ {
newSeq: REF TripleSequence _ NEW[TripleSequence[seq.length + 64]];
FOR i: NAT IN [0..seq.length) DO newSeq[i] _ seq[i];  ENDLOOP;
seq _ newSeq;
};
lookingFroms: REF TripleSequence _ NEW[TripleSequence[16]];
lookingAts: REF TripleSequence _ NEW[TripleSequence[16]];
i: NAT _ 0;

SetUpAnimation[context, filename];

FOR list: LIST OF Triple _ lookingFrom, list.rest UNTIL list = NIL DO
lookingFroms[i] _ list.first;    i _ i + 1;
IF i >= lookingFroms.maxLength THEN ExpandSequence[lookingFroms];
ENDLOOP;
lookingFroms.length _ i;
i _ 0;
FOR list: LIST OF Triple _ lookingAt, list.rest UNTIL list = NIL DO
lookingAts[i] _ list.first;    i _ i + 1;
IF i >= lookingAts.maxLength THEN ExpandSequence[lookingAts];
ENDLOOP;
lookingAts.length _ i;

IF endAt = 0 THEN endAt _ framesOnPath;
IF closed
THEN Animation3D.MoveOnClosedCurve[ context, lookingFroms, lookingAts, 
												NewFrame, framesOnPath, startAt, endAt ]
ELSE Animation3D.MoveOnOpenCurve[ context, lookingFroms, lookingAts, 
											  NewFrame, framesOnPath, startAt, endAt ];
FinishAnimation[context];
};


Init[];

END.
~ColorDisplayRenderImpl.mesa 
Last Edited by: Crow, April 4, 1989 9:56:19 am PDT
Glassner, March 14, 1989 2:18:27 pm PST
Bloomenthal, December 29, 1988 9:06:41 pm PST
Types
Globals
Utility Procedures
Updates from buffered pixel map 
height: NAT _ screenPixels.box.max.s;    width: NAT _ screenPixels.box.max.f/2; 
Read 8 bit samples into red buffer:
Read 8 bit samples into green buffer:
Now, interleave the red and green 8 bit samples into the 16 bit red/green color display: 
Write the red, starting at 0, with delta.f = 2, thus writing the even bytes:
Write the green, starting at 1, with delta.f = 2, thus writing the odd bytes:
PROC [data: REF] RETURNS [results: REF _ NIL]
Initialize Standard Displays
Establishes PixelMap corresponding to bits on color display.  If viewers are being buffered,  
sets up pixel maps in VM to be blitted across as appropriate.
This is called by ThreeDBasics.LoadDisplayType

For using color display without viewers
Reform screen memory to address by 8-bit chunks
reconfigure R&G color display sample maps as a big, double-width 8-bit sample map:
First sample map is on-screen, for full-color, first sample map is interleaved R&G, second is off-screen green, third is on-screen blue.  Green and R&G and blitted together as necessary
Computed by SurfaceRender.ValidateView or ThreeDViewer.GetViewportFromViewer
Colors

Low-level drawing
Put a string of characters on the screen
Frame Generation and Animation
The following blows up if the viewPort is NIL (As it often can be) !!!
Use forked process to copy bits over periodically, too complex to do onscreen
If PeriodicUpdateFullColorDisplay, in its final pass, missed some pixels being rendered:
Ordered dither for crude looks at full-color
Ordered dither for crude looks at full-color using Imager's color map
PROC[context: Context, lookingFrom, lookingAt: Triple, frameNo: NAT]
Animate along curved path of typed in points
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