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Added a 160x192x2 TGI (graphics) driver to the VIC-20 library.

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The driver requires a special linker configuration: "vic20-tgi.cfg".
The VIC-20 computer needs at least 8K of expansion RAM!

"tgidemo.c" needed to be adjusted because the VIC-20's vertical (y) range is greater than its horizontal (x) range -- the opposite of most other platforms.  Also, the circle demo would jam on the VIC-20.
This commit is contained in:
Greg King
2020-07-08 05:55:30 -04:00
parent d1833cc441
commit 410e4502ee
11 changed files with 1253 additions and 23 deletions
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include/tgi.h
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@@ -216,7 +216,7 @@ void __fastcall__ tgi_arc (int x, int y, unsigned char rx, unsigned char ry,
/* Draw an ellipse arc with center at x/y and radii rx/ry using the current
** drawing color. The arc covers the angle between sa and ea (startangle and
** endangle), which must be in the range 0..360 (otherwise the function may
** bevave unextectedly).
** behave unexpectedly).
*/
void __fastcall__ tgi_pieslice (int x, int y, unsigned char rx, unsigned char ry,