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add a Sega Mega Drive / Genesis drawing mode

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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
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23
src/buttons_effects.c
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@@ -181,6 +181,7 @@ static int Check_block_constraints(enum IMAGE_MODES mode)
int block_width = 8, block_height = 8, max_colors = 2; // default values
int error_count = 0;
byte errcol = 17;
byte pal_mask;
switch (mode)
{
@@ -198,9 +199,14 @@ static int Check_block_constraints(enum IMAGE_MODES mode)
max_colors = 4;
errcol = 33;
break;
case IMAGE_MODE_MEGADRIVE:
max_colors = 16;
errcol = 65;
break;
default:
return -1; // unsupported mode
}
pal_mask = ~(max_colors - 1);
for (y = 0; y <= Main.image_height - block_height; y += block_height)
{
@@ -215,11 +221,11 @@ static int Check_block_constraints(enum IMAGE_MODES mode)
{
int i;
byte col = Read_pixel_from_layer(0, x+x2, y+y2);
if (mode == IMAGE_MODE_GBC)
if (mode == IMAGE_MODE_GBC || mode == IMAGE_MODE_MEGADRIVE)
{
if (count == 0)
c[count++] = col;
else if ((col & ~3) != (c[0] & ~3)) // compare palettes
else if ((col & pal_mask) != (c[0] & pal_mask)) // compare palettes
{
if (Main.backups->Pages->Nb_layers < 2)
Add_layer(Main.backups, 1);
@@ -566,6 +572,7 @@ void Button_Constraint_menu(void)
} modes[] = {
{IMAGE_MODE_ZX, "ZX Spectrum", "2 colors per 8x8 block", 1}, // 256x192
{IMAGE_MODE_GBC, "Game Boy Color","4 colors per 8x8 block", 1}, // 160x144 to 256x256
{IMAGE_MODE_MEGADRIVE,"Sega MegaDrive","16colors per 8x8 block",1}, // 256x224 to 1024x256
{IMAGE_MODE_THOMSON, "40col (MO/TO)", "2 colors per 8x1 block", 1}, // 320x200
{IMAGE_MODE_EGX, "EGX (CPC)", "Alternate Mode0/Mode1 ", 0}, // 320x200
{IMAGE_MODE_EGX2, "EGX2 (CPC)", "Alternate Mode1/Mode2 ", 0}, // 640x200
@@ -620,7 +627,7 @@ void Button_Constraint_menu(void)
}
else if (clicked_button == 3)
{
if (Selected_Constraint_Mode == IMAGE_MODE_GBC)
if (Selected_Constraint_Mode == IMAGE_MODE_GBC || Selected_Constraint_Mode == IMAGE_MODE_MEGADRIVE)
set_palette = 1; // activate palette back when switching from GBC
Selected_Constraint_Mode = Window_attribute2;
for (i = 0; i < sizeof(modes)/sizeof(modes[0]) ; i++)
@@ -632,7 +639,7 @@ void Button_Constraint_menu(void)
Display_cursor();
break;
}
if (Selected_Constraint_Mode == IMAGE_MODE_GBC)
if (Selected_Constraint_Mode == IMAGE_MODE_GBC || Selected_Constraint_Mode == IMAGE_MODE_MEGADRIVE)
set_palette = 0;
}
else if (clicked_button == 4) // palette
@@ -714,6 +721,7 @@ void Button_Constraint_menu(void)
case IMAGE_MODE_ZX:
case IMAGE_MODE_GBC:
case IMAGE_MODE_C64HIRES:
case IMAGE_MODE_MEGADRIVE:
Snap_width = 8;
Snap_height = 8;
break;
@@ -759,6 +767,13 @@ void Button_Constraint_menu(void)
Fore_color = 7;
Back_color = 0;
break;
case IMAGE_MODE_MEGADRIVE: // 64 colors among 512
memset(Main.palette + 64, 0, sizeof(T_Components) * (256 - 64));
Main.palette[65].R = 255; // for color clashes
First_color_in_palette = 0;
Fore_color = 15;
Back_color = 0;
break;
case IMAGE_MODE_GBC: // 32 colors among 32768
memset(Main.palette + 32, 0, sizeof(T_Components) * (256 - 32));
Main.palette[33].R = 255; // for color clashes