better interfaces for video modes 3/4/5

This commit is contained in:
Lokathor 2022-10-16 13:38:59 -06:00
parent 6d119969eb
commit 96fc89cdbe

View file

@ -316,37 +316,91 @@ make_me_a_screenblock_addr!(
max_index: 23 max_index: 23
); );
/// Gets the block of memory for a single scanline of the Video Mode 3 bitmap. /// Video mode 3 has a single full resolution bitmap
/// #[derive(Debug, Clone, Copy, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
/// ## Panics pub struct VideoMode3Bitmap;
/// * `line` must be less than 160. impl VideoMode3Bitmap {
#[inline] /// Gets the block of memory for a single scanline of the bitmap.
#[must_use] ///
pub const fn mode3_scanline(line: usize) -> VolBlock<Color, Safe, Safe, 240> { /// ## Panics
/// * `line` must be less than 160.
#[inline]
#[must_use]
pub const fn scanline(self, line: usize) -> VolBlock<Color, Safe, Safe, 240> {
assert!(line < 160); assert!(line < 160);
unsafe { VolBlock::new(0x0600_0000 + line * size_of::<[Color; 240]>()) } unsafe { VolBlock::new(0x0600_0000 + line * size_of::<[Color; 240]>()) }
} }
/// Gets an individual pixel within the Video Mode 3 bitmap. /// Gets an individual pixel address within the bitmap.
/// ///
/// ## Panics /// ## Panics
/// * `row` must be less than 160. /// * `row` must be less than 160.
/// * `col` must be less than 240. /// * `col` must be less than 240.
#[inline] #[inline]
#[must_use] #[must_use]
pub const fn mode3_row_col(row: usize, col: usize) -> VolAddress<Color, Safe, Safe> { pub const fn row_col(self, row: usize, col: usize) -> VolAddress<Color, Safe, Safe> {
assert!(row < 160); assert!(row < 160);
assert!(col < 240); assert!(col < 240);
mode3_scanline(row).index(col) self.scanline(row).index(col)
}
} }
def_mmio!(0x0600_0000 = MODE4_FRAME0: VolBlock<u8x2, Safe, Safe, {(240/2) * 160}>; "Mode 4 indexmap, frame 0, (240/2)x160."); /// Video mode 4 has two 8bpp indexmaps.
def_mmio!(0x0600_A000 = MODE4_FRAME1: VolBlock<u8x2, Safe, Safe, {(240/2) * 160}>; "Mode 4 indexmap, frame 1, (240/2)x160."); ///
/// Because VRAM can't be written with less than `u16` at a time, the scanlines
/// here use `u8x2` to represent pixels pairs so that all the writes are at
/// least `u16` large.
#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct VideoMode4Frame(usize);
impl VideoMode4Frame {
pub const _0: Self = Self(0x0600_0000);
pub const _1: Self = Self(0x0600_A000);
def_mmio!(0x0600_0000 = MODE5_FRAME0: VolBlock<Color, Safe, Safe, {160 * 128}>; "Mode 5 bitmap, frame 0, 160x128."); /// Gets the block of memory for a single scanline of the frame's indexmap.
def_mmio!(0x0600_A000 = MODE5_FRAME1: VolBlock<Color, Safe, Safe, {160 * 128}>; "Mode 5 bitmap, frame 1, 160x128."); ///
/// ## Panics
/// * `line` must be less than 160.
#[inline]
#[must_use]
pub const fn scanline(self, line: usize) -> VolBlock<u8x2, Safe, Safe, {240/2}> {
assert!(line < 160);
unsafe { VolBlock::new(self.0 + line * size_of::<[u8x2; 240/2]>()) }
}
}
def_mmio!(0x0601_0000 = OBJ_TILES: VolBlock<Tile4, Safe, Safe, 1024>; "Object tiles. In bitmap modes, only indices 512..=1023 are available."); /// Video mode 5 has two reduced-resolution bitmaps.
#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct VideoMode5Frame(usize);
impl VideoMode5Frame {
pub const _0: Self = Self(0x0600_0000);
pub const _1: Self = Self(0x0600_A000);
/// Gets the block of memory for a single scanline of the frame's indexmap.
///
/// ## Panics
/// * `line` must be less than 128.
#[inline]
#[must_use]
pub const fn scanline(self, line: usize) -> VolBlock<Color, Safe, Safe, 160> {
assert!(line < 128);
unsafe { VolBlock::new(self.0 + line * size_of::<[Color; 160]>()) }
}
/// Gets an individual pixel address within the bitmap.
///
/// ## Panics
/// * `row` must be less than 128.
/// * `col` must be less than 160.
#[inline]
#[must_use]
pub const fn row_col(self, row: usize, col: usize) -> VolAddress<Color, Safe, Safe> {
assert!(row < 128);
assert!(col < 160);
self.scanline(row).index(col)
}
}
def_mmio!(0x0601_0000 = OBJ_TILES: VolBlock<Tile4, Safe, Safe, 1024>; "Object tiles. In video modes 3, 4, and 5 only indices 512..=1023 are available.");
// Object Attribute Memory (OAM) // Object Attribute Memory (OAM)