84 lines
2 KiB
ObjectPascal
84 lines
2 KiB
ObjectPascal
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PROGRAM ScrollTest;
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Uses svgalib;
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type
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VideoMemType = array[0..65535] of byte;
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var
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i,mode,StartupMode : longint;
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SeparateReadWriteWindows : boolean;
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modeinfo : ^vga_modeinfo;
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VideoMem : ^VideoMemType;
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p : pointer;
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Procedure DrawRectangle(x1,y1,x2,y2 : integer);
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begin
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vga_drawline(x1,y1,x2,y1);
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vga_drawline(x1,y2,x2,y2);
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vga_drawline(x1,y1,x1,y2);
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vga_drawline(x2,y1,x2,y2);
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end; {DrawRectangle}
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Procedure Scroll;
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{ copies first bank of screen to the last bank (for 1024x768x256 mode) }
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var i : word;
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begin
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vga_setreadpage(0);
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vga_setwritepage(11);
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for i := 65535 downto 0 do VideoMem^[i] := VideoMem^[i];
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end; {Scroll}
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(*
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Procedure Scroll; Assembler;
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{ copies first bank of screen to the last bank (for 1024x768x256 mode) }
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var popreturn : longint;
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asm
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mov esi,SegA000
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mov edi,esi
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mov eax,0
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push eax
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call vga_setreadpage {set read bank}
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pop popreturn {tidy stack}
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mov eax,11
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push eax
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call vga_setwritepage {set write bank}
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pop popreturn {tidy stack}
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mov ecx,16384
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rep movsd {copy all of bank 0 to bank 11}
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end; {Scroll}
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*)
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begin
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mode := 12; {1024x768x256}
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i := vga_init;
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StartupMode := vga_getcurrentmode;
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vga_setmode(mode);
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gl_setcontextvga(mode);
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p := vga_getgraphmem;
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VideoMem := p;
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modeinfo := vga_getmodeinfo(mode);
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SeparateReadWriteWindows := (modeinfo^.flags and HAVE_RWPAGE <> 0);
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if SeparateReadWriteWindows <> False then begin
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vga_setcolor(14);
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gl_fillbox(100,0,823,63,13);
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DrawRectangle(100,0,923,63);
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vga_setcolor(3);
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vga_drawline(0,0,1023,767);
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vga_drawline(1023,0,0,767);
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for i := 0 to 5000000 do vga_drawpixel(10,10); {delay}
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Scroll; {copy first 64 lines down to last 64 lines of screen}
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for i := 0 to 5000000 do vga_drawpixel(10,10); {delay}
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end;
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vga_setmode(StartupMode);
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writeln('SeparateReadWriteWindows = ',SeparateReadWriteWindows);
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writeln('vgamode = ',mode);
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end.
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