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Compute 2bpp background framebuffer (#4)

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FranLMSP
2024-01-21 23:59:58 +00:00
committed by GitHub
parent e2446514db
commit 01b3493547
16 changed files with 199 additions and 26 deletions
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snes-core/src/ppu/registers.rs
+7 -7
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@@ -111,7 +111,7 @@ pub enum BgSize {
T32x32,
T64x32, // V Mirror
T32x64, // H Mirror
T64x64, // H Mirror
T64x64, // H/V Mirror
}
impl BgSize {
@@ -266,10 +266,10 @@ impl PPURegisters {
pub fn get_bg_tile_size(&self, background: Background) -> TileSize {
let byte = self._read(BGMODE);
let bit = match background {
Background::Bg1 => byte >> 3 & 0b1 == 1, // Bit 4
Background::Bg2 => byte >> 4 & 0b1 == 1, // Bit 5
Background::Bg3 => byte >> 5 & 0b1 == 1, // Bit 6
Background::Bg4 => byte >> 6 & 0b1 == 1, // Bit 7
Background::Bg1 => byte >> 4 & 0b1 == 1, // Bit 4
Background::Bg2 => byte >> 5 & 0b1 == 1, // Bit 5
Background::Bg3 => byte >> 6 & 0b1 == 1, // Bit 6
Background::Bg4 => byte >> 7 & 0b1 == 1, // Bit 7
};
match bit {
true => TileSize::P16x16,
@@ -393,9 +393,9 @@ mod ppu_registers_test {
#[test]
fn test_get_bg_tile_size() {
let mut registers = PPURegisters::new();
registers.write(BGMODE, 0b00000100);
registers.write(BGMODE, 0b00000000);
assert_eq!(registers.get_bg_tile_size(Background::Bg1), TileSize::P8x8);
registers.write(BGMODE, 0b00001100);
registers.write(BGMODE, 0b00010000);
assert_eq!(registers.get_bg_tile_size(Background::Bg1), TileSize::P16x16);
}