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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,6 @@ | ||
| pub mod bus; | ||
| pub mod render; | ||
| pub mod sprites; | ||
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| #[cfg(test)] | ||
| pub mod tests; | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| use super::*; | ||
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| pub const OAM_ENTRIES: usize = 128; | ||
| pub const TILE_WIDTH: usize = 8; | ||
| pub const TILE_HEIGHT: usize = 8; | ||
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| #[derive(Debug)] | ||
| pub struct OAMEntry { | ||
| pub x: usize, | ||
| pub y: usize, | ||
| pub priority: u8, | ||
| pub attr: u8, | ||
| pub tileidx: u16, | ||
| pub width: usize, | ||
| pub height: usize, | ||
| } | ||
| impl OAMEntry { | ||
| pub fn flip_x(&self) -> bool { | ||
| self.attr & (1 << 6) != 0 | ||
| } | ||
| pub fn flip_y(&self) -> bool { | ||
| self.attr & (1 << 7) != 0 | ||
| } | ||
| pub fn palette(&self) -> u8 { | ||
| (self.attr >> 1) & 0x07 | ||
| } | ||
| pub fn get_tileidx(&self, tile_x: usize, tile_y: usize) -> usize { | ||
| debug_assert!(tile_x < self.width / TILE_WIDTH); | ||
| debug_assert!(tile_y < self.height / TILE_HEIGHT); | ||
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| let t_w = self.width / TILE_WIDTH; | ||
| let t_h = self.height / TILE_HEIGHT; | ||
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| // Flip tiles as well as the pixels in the tiles | ||
| let tile_x = if self.flip_x() { | ||
| t_w - tile_x - 1 | ||
| } else { | ||
| tile_x | ||
| }; | ||
| let tile_y = if self.flip_y() { | ||
| t_h - tile_y - 1 | ||
| } else { | ||
| tile_y | ||
| }; | ||
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| (usize::from(self.tileidx) + tile_x + 0x10 * tile_y) & 0x1FF | ||
| } | ||
| } | ||
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| #[derive(Debug)] | ||
| pub struct SpriteTile<'a> { | ||
| pub data: &'a [VramWord], | ||
| pub oam: &'a OAMEntry, | ||
| } | ||
| impl<'a> SpriteTile<'a> { | ||
| pub fn get_coloridx(&self, x: usize, y: usize) -> u8 { | ||
| let mut result: u8 = 0; | ||
| let bitp_w = BPP::Four.num_bitplanes() / VRAM_WORDSIZE; | ||
| let y = if self.oam.flip_y() { | ||
| TILE_HEIGHT - 1 - y | ||
| } else { | ||
| y | ||
| }; | ||
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| let (x_a, x_b) = if self.oam.flip_x() { | ||
| (1 << x, 1 << 8 + x) | ||
| } else { | ||
| (1 << 7 - x, 1 << 15 - x) | ||
| }; | ||
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| for i in 0..bitp_w { | ||
| let offset = y + (TILE_WIDTH * i); | ||
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| if self.data[offset] & x_a != 0 { | ||
| result |= 1 << (i * VRAM_WORDSIZE); | ||
| } | ||
| if self.data[offset] & x_b != 0 { | ||
| result |= 1 << ((i * VRAM_WORDSIZE) + 1); | ||
| } | ||
| } | ||
| result | ||
| } | ||
| } | ||
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| impl<TRenderer> PPU<TRenderer> | ||
| where | ||
| TRenderer: Renderer, | ||
| { | ||
| pub fn get_oam_entry(&self, idx: usize) -> OAMEntry { | ||
| let e = &self.oam[(idx * 4)..((idx + 1) * 4)]; | ||
| let extoffset_byte = 512 + (idx / 4); | ||
| let extoffset_sh = (idx % 4) * 2; | ||
| let ext = (self.oam[extoffset_byte] >> extoffset_sh) & 0x03; | ||
| let large = ext & 0x02 != 0; | ||
| let (width, height) = match ((self.obsel >> 5) & 0x07, large) { | ||
| // Small sprites | ||
| (0..=2, false) => (8, 8), | ||
| (3..=4, false) => (16, 16), | ||
| (5, false) => (32, 32), | ||
| (6..=7, false) => (16, 32), | ||
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| // Large sprites | ||
| (0, true) => (16, 16), | ||
| (1, true) => (32, 32), | ||
| (2 | 4..=5, true) => (64, 64), | ||
| (3 | 7, true) => (32, 32), | ||
| (6, true) => (32, 64), | ||
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| _ => unreachable!(), | ||
| }; | ||
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| OAMEntry { | ||
| x: usize::from(e[0]) | (usize::from(ext) & 0x01) << 8, | ||
| y: e[1].into(), | ||
| tileidx: e[2] as u16 | (e[3] as u16 & 0x01) << 8, | ||
| attr: e[3], | ||
| priority: (e[3] >> 4) & 0x03, | ||
| width, | ||
| height, | ||
| } | ||
| } | ||
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| pub fn get_sprite_tile<'a>( | ||
| &'a self, | ||
| oam: &'a OAMEntry, | ||
| tile_x: usize, | ||
| tile_y: usize, | ||
| ) -> SpriteTile { | ||
| let base_addr = (self.obsel as usize & 0x07) * 8192; | ||
| let len = 32 * BPP::Four.num_bitplanes() / VRAM_WORDSIZE; | ||
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| let idx = base_addr + (oam.get_tileidx(tile_x, tile_y) << 4); | ||
| let idx = if oam.tileidx >= 0x100 { | ||
| idx + ((self.obsel as usize >> 3) & 3) * 4096 | ||
| } else { | ||
| idx | ||
| }; | ||
| let idx = idx & VRAM_ADDRMASK; | ||
| let end_idx = (idx + len) & VRAM_ADDRMASK; | ||
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| SpriteTile { | ||
| data: &self.vram[idx..end_idx], | ||
| oam, | ||
| } | ||
| } | ||
| } |