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1993-09-11
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SuperVGA 65536 BGI driver
Version 1.5
August 28, 1993
Revisions:
1.1 - May 21, 1993
1.0 - April 10, 1993
This is the newest version of my SuperVGA 65536 BGI driver. All functions
have been implemented, but there may still be bugs.
Note: Palette functions, and the mouse cursor will not work with this driver.
Using the HiColor driver:
Implementing the 65536 color driver involved several hacks, as
the BGI interface only supports 8-bit color values, but the driver
needed support for 16-bit color values. The procedures that needed
to be changed were those that accepted color values, (SetColor,
SetFillStyle, SetFillPattern, PutPixel and Floodfill) and those
that return color values (GetColor and GetPixel).
As the HiColor modes do not support palettes, I decided to use
the SetRgbPalette call to set colors, as it accepts values for the
R,G and B components of the color.
The format of a pixel in the HiColor modes is:
-Byte 1- -Byte 0-
RRRRRGGG GGGBBBBB
Several new functions are defined to make the color selection easier.
In addition, the macro RGB(rv,gv,bv) has been defined. It packs
the R, G and B values into the format described above and returns the
combined color.
* RealDrawColor(); - Sets the current drawing color.
Usage:
setcolor(RealDrawColor(RGB(rval,gval,bval)); - HiColor modes
setcolor(RealDrawColor(cval)); - (suggested for any other driver)
* RealFillColor(); - Sets the current fill color.
Usage:
setfillstyle(fillstyle,RealFillColor(RGB(rval,gval,bval)));
setfillstyle(fillstyle,RealFillColor(cval));
setfillpattern(fillpat,RealFillColor(RGB(rval,gval,bval)));
setfillpattern(fillpat,RealFillColor(cval));
* RealColor(); - For putpixel, sets the color of the pixel
- For floodfill, sets the color of the boundary
putpixel(x,y,RealColor(RGB(rval,gval,bval)));
putpixel(x,y,RealColor(cval));
floodfill(x,y,RealColor(RGB(rval,gval,bval)));
floodfill(x,y,RealColor(cval));
* GetPixel normally only returns an 8-bit value. However, the
value returned from the BGI driver is a 16-bit value in DX (the
BGI kernel loads the value into AX and clears the upper 8 bits),
so to read the value of a pixel:
In Pascal:
Color := getpixel(x,y);
inline($89/$56/<Color); (* Loads 16-bit color value *)
In C:
Color = getpixel(x,y);
Color = _DX;
* Paging information:
Mode Paging? # of pages (with 1024k)
320x200 yes 8
640x350 yes 2
640x400 yes 2
640x480 no 1
800x600 no 1
* Works with: ATI, Cirrus, Everex, NCR, Oak-077, Primus 2000,
Paradise WD90c3x and VESA [v1.2+]
o Fixed text clipping at right and bottom edges (1.1)
o Various speed optimizations (line & solid bar) (1.1)
o Added compile-time support for 8x8, 8x14, or 8x16 bitmap fonts (1.1)
o Drivers now have compile-time support for BGI version 3.0.
Supports protected mode with Borland Pascal 7.0 (1.5)
o Added 1024x768x64k and 1280x1024x64k modes. (1.5)