2019-08-27 21:15:22 +01:00
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use super::super::SysBus;
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use super::regs::*;
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use super::*;
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use crate::core::sysbus::OAM_ADDR;
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const OVRAM: u32 = 0x0601_0000;
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const PALRAM_OFS_FG: u32 = 0x200;
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const ATTRS_SIZE: u32 = 2 * 3 + 2;
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struct ObjAttrs(Attribute0, Attribute1, Attribute2);
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struct ObjAffineParams {
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pa: i16,
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pb: i16,
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pc: i16,
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pd: i16,
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}
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const AFFINE_FILL: u32 = 2 * 3;
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impl ObjAffineParams {
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fn from_index(sb: &SysBus, index: u32) -> ObjAffineParams {
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let mut offset = AFFINE_FILL + index * 16 * 2;
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let pa = sb.read_16(offset) as i16;
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offset += 2 + AFFINE_FILL;
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let pb = sb.read_16(offset) as i16;
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offset += 2 + AFFINE_FILL;
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let pc = sb.read_16(offset) as i16;
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offset += 2 + AFFINE_FILL;
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let pd = sb.read_16(offset) as i16;
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ObjAffineParams { pa, pb, pc, pd }
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}
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}
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impl ObjAttrs {
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fn size(&self) -> (usize, usize) {
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let n = 8 << self.1.size();
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match self.0.shape() {
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0 /* Square */ => (n, n),
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1 /* Wide */ => (n, n >> 1),
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2 /* Tall */ => (n >> 1, n),
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_ => unreachable!("invalid obj shape")
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}
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}
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fn coords(&self) -> (usize, usize) {
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(self.1.x_coord() as usize, self.0.y_coord() as usize)
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}
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fn tile_format(&self) -> (usize, PixelFormat) {
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if self.0.is_8bpp() {
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(0x40, PixelFormat::BPP8)
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} else {
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(0x20, PixelFormat::BPP4)
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}
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}
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fn is_affine(&self) -> bool {
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match self.0.objtype() {
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ObjType::Affine | ObjType::AffineDoubleSize => true,
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_ => false,
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}
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}
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fn affine_index(&self) -> u32 {
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let attr1 = (self.1).0;
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((attr1 >> 9) & 0x1f) as u32
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}
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fn is_hidden(&self) -> bool {
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self.0.objtype() == ObjType::Hidden
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}
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fn flip_xy(&self) -> (bool, bool) {
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if !self.is_affine() {
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(self.1.h_flip(), self.1.v_flip())
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} else {
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(false, false)
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}
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}
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}
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fn read_obj_attrs(sb: &SysBus, obj: usize) -> ObjAttrs {
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let addr = ATTRS_SIZE * (obj as u32);
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let attr0 = Attribute0(sb.oam.read_16(addr + 0));
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let attr1 = Attribute1(sb.oam.read_16(addr + 2));
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let attr2 = Attribute2(sb.oam.read_16(addr + 4));
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ObjAttrs(attr0, attr1, attr2)
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}
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impl Gpu {
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fn obj_tile_base(&self) -> u32 {
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match self.dispcnt.mode() {
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mode if mode > 2 => OVRAM + 0x4000,
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_ => OVRAM,
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}
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}
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pub fn render_objs(&mut self, sb: &SysBus) {
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let screen_y = self.current_scanline;
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// reset the scanline
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self.obj_line = Scanline::default();
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2019-08-31 13:13:21 +01:00
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self.obj_line_priorities = Scanline([3; DISPLAY_WIDTH]);
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2019-08-27 21:15:22 +01:00
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for obj_num in (0..128).rev() {
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let obj = read_obj_attrs(sb, obj_num);
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if obj.is_hidden() {
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continue;
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}
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let is_affine = obj.is_affine();
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if is_affine {
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panic!("im not ready for that yet :(");
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}
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let (obj_x, obj_y) = obj.coords();
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let (obj_w, obj_h) = obj.size();
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// skip this obj if not within its bounds.
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if !(screen_y >= obj_y && screen_y < obj_y + obj_h) {
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continue;
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}
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let tile_base = self.obj_tile_base() + 0x20 * (obj.2.tile() as u32);
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let (tile_size, pixel_format) = obj.tile_format();
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let palette_bank = match pixel_format {
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PixelFormat::BPP4 => obj.2.palette(),
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_ => 0u32,
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};
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let tile_array_width = match self.dispcnt.obj_mapping() {
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ObjMapping::OneDimension => obj_w / 8,
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ObjMapping::TwoDimension => {
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if obj.0.is_8bpp() {
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16
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} else {
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32
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}
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}
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};
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let (xflip, yflip) = obj.flip_xy();
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let end_x = obj_x + obj_w;
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for screen_x in obj_x..end_x {
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if screen_x > DISPLAY_WIDTH {
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break;
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}
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2019-08-31 13:13:21 +01:00
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if self.obj_line_priorities[screen_x] < obj.2.priority() {
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continue;
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}
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2019-08-27 21:15:22 +01:00
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let mut sprite_y = screen_y - obj_y;
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let mut sprite_x = screen_x - obj_x;
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if (!is_affine) {
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sprite_y = if yflip {
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obj_h - sprite_y - 1
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} else {
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sprite_y
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};
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sprite_x = if xflip {
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obj_w - sprite_x - 1
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} else {
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sprite_x
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};
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}
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let tile_x = sprite_x % 8;
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let tile_y = sprite_y % 8;
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let tile_addr = tile_base
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+ index2d!(u32, sprite_x / 8, sprite_y / 8, tile_array_width)
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* (tile_size as u32);
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let pixel_index = self.read_pixel_index(
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sb,
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tile_addr,
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tile_x as u32,
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tile_y as u32,
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pixel_format,
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);
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let pixel_color =
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self.get_palette_color(sb, pixel_index as u32, palette_bank, PALRAM_OFS_FG);
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if pixel_color != Rgb15::TRANSPARENT {
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self.obj_line[screen_x] = pixel_color;
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2019-08-31 13:13:21 +01:00
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self.obj_line_priorities[screen_x] = obj.2.priority();
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2019-08-27 21:15:22 +01:00
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}
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}
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}
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}
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}
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#[derive(Debug, Primitive, Copy, Clone, PartialEq)]
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enum ObjMode {
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Normal = 0b00,
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Sfx = 0b01,
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Window = 0b10,
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Forbidden = 0b11,
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}
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impl From<u16> for ObjMode {
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fn from(v: u16) -> ObjMode {
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ObjMode::from_u16(v as u16).unwrap()
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}
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}
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#[derive(Debug, Primitive, Copy, Clone, PartialEq)]
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enum ObjType {
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Normal = 0b00,
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Affine = 0b01,
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Hidden = 0b10,
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AffineDoubleSize = 0b11,
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}
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impl From<u16> for ObjType {
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fn from(v: u16) -> ObjType {
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ObjType::from_u16(v as u16).unwrap()
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}
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}
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bitfield! {
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pub struct Attribute0(u16);
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u16;
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y_coord, _ : 7, 0;
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into ObjType, objtype, _: 9, 8;
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into ObjMode, objmode, _: 11, 10;
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pub mosaic, _: 12;
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is_8bpp, _: 13;
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shape, _: 15, 14;
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}
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bitfield! {
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pub struct Attribute1(u16);
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u16;
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x_coord, _ : 8, 0;
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h_flip, _: 12;
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v_flip, _: 13;
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size, _: 15, 14;
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}
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bitfield! {
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pub struct Attribute2(u16);
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u16;
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tile, _: 9, 0;
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priority, _: 11, 10;
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into u32, palette, _: 15, 12;
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}
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