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Implement a more generic "rasters" mode for CPC

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This is similar to mode 5, but with less constraints:
- All inks can have split rasters
- Split rasters have a min width of 32 pixels

Note that this is nowhere near enough to make sure the image will be
renderable (number of colors should be limited, unless there is a span
without rasters allowing to reload registers with new colors, and
moving from one pen to another also has a cost). The goal is to offer no
over-restriction (everything that can be shown on the real machine is
drawable). Additional constraints may be checked from a lua script that
will generate the code and data for displaying the picture.
This commit is contained in:
Adrien Destugues
2018-06-29 11:02:34 +02:00
parent 1d71a0759f
commit 9d46d1e90f
6 changed files with 138 additions and 59 deletions
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16
src/buttons_effects.c
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@@ -180,19 +180,26 @@ void Button_Constraint_mode(void)
if (Selected_Constraint_Mode <= IMAGE_MODE_ANIMATION)
Selected_Constraint_Mode = IMAGE_MODE_EGX;
if (Selected_Constraint_Mode == IMAGE_MODE_MODE5)
if (Selected_Constraint_Mode == IMAGE_MODE_MODE5 && (Main.image_width%48))
{
Verbose_message("Error!", "Emulation of Amstrad CPC's Mode5 can only be used on an image whose width is a multiple of 48.");
return;
}
if (Selected_Constraint_Mode == IMAGE_MODE_MODE5 || Selected_Constraint_Mode == IMAGE_MODE_RASTER)
{
/* TODO it would be great to auto-create extra layers */
if (Main.backups->Pages->Image_mode != IMAGE_MODE_LAYERED ||
Main.backups->Pages->Nb_layers!=5 || (Main.image_width%48))
Main.backups->Pages->Nb_layers!=5)
{
Verbose_message("Error!", "This emulation of Amstrad CPC's Mode5 can only be used on a 5-layer image whose width is a multiple of 48.");
Verbose_message("Error!", "Emulation of Amstrad CPC's rasters requires a 5-layer image.");
return;
}
for (pixel=0; pixel < Main.image_width*Main.image_height; pixel++)
{
if (Main.backups->Pages->Image[4].Pixels[pixel]>3)
{
Verbose_message("Error!", "This emulation of Amstrad CPC's Mode5 needs all pixels of layer 5 to use colors 0-3.");
Verbose_message("Error!", "Emulation of Amstrad CPC's rasters needs all pixels of layer 5 to use colors 0-3.");
return;
}
}
@@ -220,6 +227,7 @@ void Button_Constraint_menu(void)
{IMAGE_MODE_EGX, "EGX (CPC)"},
{IMAGE_MODE_EGX2, "EGX2 (CPC)"},
{IMAGE_MODE_MODE5, "Mode 5 (CPC)"},
{IMAGE_MODE_RASTER, "Rasters (CPC)"},
};
Open_window(154,79,"8-bit constraints");