the10thwiz/cc65
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Update tgidemo.c - fix misunderstanding about TGI colors

Browse Source
This commit is contained in:
Bob Andrews
2025-06-17 20:29:41 +02:00
committed by GitHub
parent bae58ae419
commit 0b0bead634
1 changed files with 23 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
samples/tgidemo.c
View File

@@ -13,10 +13,9 @@
#endif #endif
/* TGI colors are indices into the default palette. So keep in mind that, if /* Color values passed to TGI functions are indices into the default palette. */
you redefine the palette, those names may no more match the actual colors. */ #define COLOR_BACK 0
#define COLOR_BACK TGI_COLOR_BLACK #define COLOR_FORE 1
#define COLOR_FORE TGI_COLOR_WHITE
/*****************************************************************************/ /*****************************************************************************/
@@ -69,35 +68,30 @@ static void DoWarning (void)
/* /*
* Note that everywhere else in the TGI API, colors are referred to via TGI_COLOR_ * Note that everywhere else in the TGI API, colors are referred to via an index
* color indices, which in turn refer to the default TGI palette. * to the current palette.
* *
* Redefining the colors (changing the palette) is a target dependend operation, * TGI_COLOR_ values can be used (ONLY!) for setting the palette, using them
* and the colors/values in the palette itself are not portable. * with other TGI functions only works by chance, on some targets.
*
* That said, for some (perhaps most?) targets, the COLOR_ values may work here.
*/ */
static void DoPalette (int n) static void DoPalette (int n)
{ {
static const unsigned char Palette[4][2] = { static const unsigned char Palette[4][2] = {
/* FIXME: add some ifdefs with proper values for targets that need it */ /* FIXME: add some ifdefs with proper values for targets that need it */
#if !defined(__APPLE2__) #if !defined(__APPLE2__)
{ COLOR_BLACK, COLOR_BLUE }, { TGI_COLOR_BLACK, TGI_COLOR_BLUE },
{ COLOR_WHITE, COLOR_BLACK }, { TGI_COLOR_WHITE, TGI_COLOR_BLACK },
{ COLOR_RED, COLOR_BLACK }, { TGI_COLOR_RED, TGI_COLOR_BLACK },
{ COLOR_BLACK, COLOR_WHITE }
#else #else
{ COLOR_WHITE, COLOR_BLACK }, { TGI_COLOR_WHITE, TGI_COLOR_BLACK },
{ COLOR_BLACK, COLOR_WHITE }, { TGI_COLOR_BLACK, TGI_COLOR_WHITE },
{ COLOR_WHITE, COLOR_BLACK }, { TGI_COLOR_WHITE, TGI_COLOR_BLACK },
{ COLOR_BLACK, COLOR_WHITE }
#endif #endif
}; };
tgi_setpalette (Palette[n]); tgi_setpalette (Palette[n]);
} }
static void DoCircles (void) static void DoCircles (void)
{ {
unsigned char I; unsigned char I;
@@ -117,7 +111,9 @@ static void DoCircles (void)
tgi_ellipse (X, Y, I, tgi_imulround (I, AspectRatio)); tgi_ellipse (X, Y, I, tgi_imulround (I, AspectRatio));
} }
} }
while (kbhit ()) {
cgetc ();
}
cgetc (); cgetc ();
} }
@@ -186,6 +182,9 @@ static void DoDiagram (void)
tgi_lineto (XOrigin + X, YOrigin + Y); tgi_lineto (XOrigin + X, YOrigin + Y);
} }
while (kbhit ()) {
cgetc ();
}
cgetc (); cgetc ();
} }
@@ -206,6 +205,9 @@ static void DoLines (void)
tgi_line (Min, Min, Min-X, 0); tgi_line (Min, Min, Min-X, 0);
} }
while (kbhit ()) {
cgetc ();
}
cgetc (); cgetc ();
} }
@@ -241,8 +243,7 @@ int main (void)
/* Do graphics stuff */ /* Do graphics stuff */
/* first uses the default palette */ /* use default palette */ DoCircles ();
DoCircles ();
DoPalette (0); DoCheckerboard (); DoPalette (0); DoCheckerboard ();
DoPalette (1); DoDiagram (); DoPalette (1); DoDiagram ();
DoPalette (2); DoLines (); DoPalette (2); DoLines ();