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chore: define affine sprite attributes

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-10-21 05:12:41 -03:00
parent 61483b93e8
commit a102d68e99
1 changed files with 43 additions and 2 deletions
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45
src/ppu.zig
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@ -135,7 +135,7 @@ pub const Ppu = struct {
if (maybe_sprites) |sprite| {
// Move on to the next sprite If its of a different priority
if (sprite.priority() != prio) continue :sprite_loop;
if (sprite.attr0.rot_scaling.read()) continue :sprite_loop; // TODO: Affine Sprites
if (sprite.attr0.is_affine.read()) continue :sprite_loop; // TODO: Affine Sprites
var i: u9 = 0;
px_loop: while (i < sprite.width) : (i += 1) {
@ -747,9 +747,32 @@ const Sprite = struct {
}
};
const AffineSprite = struct {
const Self = @This();
attr0: AffineAttr0,
attr1: AffineAttr1,
attr2: Attr2,
width: u8,
height: u8,
fn init(attr0: AffineAttr0, attr1: AffineAttr1, attr2: Attr2) Self {
const d = spriteDimensions(attr0.shape.read(), attr1.size.read());
return .{
.attr0 = attr0,
.attr1 = attr1,
.attr2 = attr2,
.width = d[0],
.height = d[1],
};
}
};
const Attr0 = extern union {
y: Bitfield(u16, 0, 8),
rot_scaling: Bit(u16, 8), // This SBZ
is_affine: Bit(u16, 8), // This SBZ
disabled: Bit(u16, 9),
mode: Bitfield(u16, 10, 2),
mosaic: Bit(u16, 12),
@ -758,6 +781,17 @@ const Attr0 = extern union {
raw: u16,
};
const AffineAttr0 = extern union {
y: Bitfield(u16, 0, 8),
rot_scaling: Bit(u16, 8), // This SB1
double_size: Bit(u16, 9),
mode: Bitfield(u16, 10, 2),
mosaic: Bit(u16, 12),
is_8bpp: Bit(u16, 13),
shape: Bitfield(u16, 14, 2),
raw: u16,
};
const Attr1 = extern union {
x: Bitfield(u16, 0, 9),
h_flip: Bit(u16, 12),
@ -766,6 +800,13 @@ const Attr1 = extern union {
raw: u16,
};
const AffineAttr1 = extern union {
x: Bitfield(u16, 0, 9),
aff_sel: Bitfield(u16, 9, 5),
size: Bitfield(u16, 14, 2),
raw: u16,
};
const Attr2 = extern union {
tile_id: Bitfield(u16, 0, 10),
rel_prio: Bitfield(u16, 10, 2),