GEMini Atari/GEMini_Atari_CD-ROM_Walnut_Creek_December_1993.iso/files/gnu/gchsrc31/atarilib/smallgra.cc

C/C++ Source or Header | 1992-04-27 | 5KB | 324 lines

//////////////////////////////////////////////////////////////////////////////
//
//  This file is part of the Atari Machine Specific Library,
//  and is Copyright 1992 by Warwick W. Allison.
//
//  You are free to copy and modify these sources, provided you acknoledge
//  the origin by retaining this notice, and adhere to the conditions
//  described in the file COPYING.
//
//////////////////////////////////////////////////////////////////////////////

#include <linea.h>
#include "SmallGraphics.h"

static short Pattern[4]={0xffff,0xffff,0xffff,0xffff};

void InitSmallGraphics()
{
    linea0();
    __aline->_LNMASK=0xffff;
    __aline->_PTSIN[0]=0;
    __aline->_PTSIN[1]=0;
    __aline->_WMODE=0;
    __aline->_LNMASK=0xffff;
    __aline->_LSTLIN=-1;
    __aline->_PATPTR=Pattern;
    __aline->_PATMSK=4;
    __aline->_MFILL=0;
    __aline->_CLIP=0;
}

void Colour(int C)
{
    __aline->_INTIN[0]=C;
    __aline->_COLBIT0=C&1;
    __aline->_COLBIT1=C&2;
    __aline->_COLBIT2=C&4;
    __aline->_COLBIT3=C&8;
}

void Plot(int x, int y)
{
    __aline->_PTSIN[0]=x;
    __aline->_PTSIN[1]=y;
    linea1();
}

void Plot(int x, int y, int C)
{
    Colour(C);
    __aline->_PTSIN[0]=x;
    __aline->_PTSIN[1]=y;
    linea1();
}

int ColourAt(int x, int y)
{
    __aline->_PTSIN[0]=x;
    __aline->_PTSIN[1]=y;
    return linea2();
}

void Line(int x, int y)
{
    __aline->_PTSIN[2]=__aline->_PTSIN[0];
    __aline->_PTSIN[3]=__aline->_PTSIN[1];
    __aline->_PTSIN[0]=x;
    __aline->_PTSIN[1]=y;
    linea3();
}

void Line(int x1, int y1, int x2, int y2)
{
/*
    __aline->_PTSIN[0]=x1;
    __aline->_PTSIN[1]=y1;
    __aline->_PTSIN[2]=x2;
    __aline->_PTSIN[3]=y2;
*/
    __aline->_X1=x1;
    __aline->_Y1=y1;
    __aline->_X2=x2;
    __aline->_Y2=y2;
    linea3();
}

void Rectangle(int x1, int y1, int x2, int y2)
{
    __aline->_PTSIN[0]=x1;
    __aline->_PTSIN[1]=y1;
    __aline->_PTSIN[2]=x2;
    __aline->_PTSIN[3]=y2;
    linea5();
}

void Fill(int x, int y)
{
    __aline->_PTSIN[0]=x;
    __aline->_PTSIN[1]=y;
    lineae();
}

int MaxX()
{
    return V_X_MAX;
}

int MaxY()
{
    return V_Y_MAX;
}
/*
IMPLEMENTATION MODULE SmallGraphics;

FROM BIOS        IMPORT bconout,setColor,PalleteArray,setPallete;
FROM LINEA        IMPORT AInit,PutPixel,DrawLine,FilledRectangle,PInterface,PFontList,Interface,GetPixel;
FROM SYSTEM        IMPORT ADR;
FROM Resolutions    IMPORT CurrentResolution,ScreenWidth,ScreenHeight,Resolution;
FROM RunSupport        IMPORT UponTermination;


VAR    Iface:PInterface;
    Fonts:PFontList;
    Col:CARDINAL;
    Pattern:ARRAY [0..15] OF CARDINAL;


PROCEDURE SolidPattern;
VAR    i:CARDINAL;
BEGIN
    FOR i:=0 TO 15 DO
        Pattern[i]:=65535;
    END;
END SolidPattern;


PROCEDURE Colour(c:CARDINAL);
BEGIN
    Col:=c;
END Colour;


VAR    OldCol:CARDINAL;
PROCEDURE SetColourPlanes;

VAR    c:CARDINAL;

BEGIN
    IF OldCol<>Col THEN
        OldCol:=Col;
        c:=Col;
        WITH Iface^ DO
            IF c>=8 THEN
                c:=c-8;
                COLBIT[3]:=1;
            ELSE
                COLBIT[3]:=0;
            END;
            IF c>=4 THEN
                c:=c-4;
                COLBIT[2]:=1;
            ELSE
                COLBIT[2]:=0;
            END;
            IF c>=2 THEN
                c:=c-2;
                COLBIT[1]:=1;
            ELSE
                COLBIT[1]:=0;
            END;
            IF c>=1 THEN
                COLBIT[0]:=1;
            ELSE
                COLBIT[0]:=0;
            END;
        END;
    END;
END SetColourPlanes;


PROCEDURE Bar(x,y,w,h:CARDINAL);
BEGIN
    SetColourPlanes;
    WITH Iface^ DO
        X1:=x;
        Y1:=y;
        X2:=x+w-1;
        Y2:=y+h-1;
    END;

    FilledRectangle;
END Bar;


PROCEDURE Plot(x,y:CARDINAL);
BEGIN
    PutPixel(Col,x,y)
    WITH Iface^ DO
        X2:=x;
        Y2:=y;
    END;
END Plot;

PROCEDURE ColourAt(x,y:CARDINAL):CARDINAL;
(* Get colour at (x,y) *)
BEGIN
    RETURN GetPixel(x,y)
END ColourAt;

PROCEDURE LineTo(x,y:CARDINAL);
BEGIN
    SetColourPlanes;
    WITH Iface^ DO
        X1:=x;
        Y1:=y;
        DrawLine;
        X2:=x;
        Y2:=y;
    END;
END LineTo;

PROCEDURE Line(x1,y1,x2,y2:CARDINAL);
BEGIN
    SetColourPlanes;
    WITH Iface^ DO
        X1:=x1;
        Y1:=y1
        X2:=x2;
        Y2:=y2;
        DrawLine;
    END;
END Line;


PROCEDURE SetScreenSize;
BEGIN
    WITH Iface^ DO
        XMINCL:=0;
        YMINCL:=0;
        XMAXCL:=ScreenWidth[CurrentResolution]-1;
        YMAXCL:=ScreenHeight[CurrentResolution]-1;
(*
        CASE CurrentResolution OF
          Low:    VPLANES:=4;
        | Medium: VPLANES:=2;
        | High:    VPLANES:=1;
        END;
*)
    END;
END SetScreenSize;


PROCEDURE EraseScreen;
BEGIN
    bconout(2,1bh);
    bconout(2,ORD('E'));
    bconout(2,1bh);
    bconout(2,ORD('v'));
    SetScreenSize;
END EraseScreen;


PROCEDURE UseXOR;
(* Graphics will use XORing *)
BEGIN
    Iface^.WMODE:=2;
END UseXOR;


PROCEDURE UseReplace;
(* Graphics will mask and OR *)
BEGIN
    Iface^.WMODE:=0;
END UseReplace;


VAR OriginalColour:PalleteArray;
PROCEDURE SetColour(C:CARDINAL; R,G,B:CARDINAL);
VAR j:CARDINAL;
BEGIN
    j:=setColor(R*256+G*16+B,C);
END SetColour;

PROCEDURE GetOriginalColours;
VAR c:CARDINAL;
BEGIN
    FOR c:=0 TO 15 DO
        OriginalColour[c]:=setColor(65535,c);
    END;
END GetOriginalColours;

PROCEDURE ResetColours;
VAR c:CARDINAL;
BEGIN
    FOR c:=0 TO 15 DO
        OriginalColour[c]:=setColor(OriginalColour[c],c);
    END;
(*
    setPallete(OriginalColour);
*)
END ResetColours;


BEGIN
    GetOriginalColours;
    AInit(Iface,Fonts);
    WITH Iface^ DO
        X2:=0;
        Y2:=0;
        WMODE:=0;
        LNMASK:=0ffffh;
        LSTLIN:=-1;
        Colour(0);
        PATPTR:=ADR(Pattern);
        PATMSK:=4;
        SolidPattern;
        MFILL:=0;
        CLIP:=0;
        SetScreenSize;
    END;
    UponTermination(ResetColours);
END SmallGraphics.
*/