m/grafX2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

add a Sega Mega Drive / Genesis drawing mode

Browse Source
This commit is contained in:
Thomas Bernard
2019-05-21 22:40:28 +02:00
parent 537334f327
commit d2777d79cb
5 changed files with 48 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
src/graph.c
View File

@@ -3413,24 +3413,33 @@ done:
/// Paint a pixel with GBC constraints
///
/// Same 4 color palette for all pixels in a 8x8 block.
///
/// Megadrive constraints are nearly the same : same 16 color palette in a 8x8 tile
static void Pixel_in_screen_gbc_with_opt_preview(word x,word y,byte color,int preview)
{
word startx = x & ~7;
word starty = y & ~7;
word x2, y2;
byte palette;
byte col_mask, pal_mask;
if (Main.backups->Pages->Image_mode == IMAGE_MODE_MEGADRIVE)
col_mask = 15;
else
col_mask = 3;
pal_mask = ~col_mask;
// first set the pixel
Pixel_in_screen_layered_with_opt_preview(x,y,color,preview);
palette = color & ~3;
palette = color & pal_mask;
// force all pixels of the block to the same palette
for (y2 = 0; y2 < 8; y2++)
{
for (x2 = 0; x2 < 8; x2++)
{
byte col = Read_pixel_from_current_layer(startx+x2, starty+y2);
if ((col & ~3) != palette)
Pixel_in_screen_layered_with_opt_preview(startx+x2, starty+y2, palette | (col & 3), preview);
if ((col & pal_mask) != palette)
Pixel_in_screen_layered_with_opt_preview(startx+x2, starty+y2, palette | (col & col_mask), preview);
}
}
}
@@ -3912,6 +3921,7 @@ void Update_pixel_renderer(void)
Pixel_in_current_screen_with_opt_preview = Pixel_in_screen_thomson_with_opt_preview;
break;
case IMAGE_MODE_GBC:
case IMAGE_MODE_MEGADRIVE:
Pixel_in_current_screen_with_opt_preview = Pixel_in_screen_gbc_with_opt_preview;
break;
case IMAGE_MODE_C64HIRES: