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minor gpu improvements

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This commit is contained in:
Alex Janka 2023-02-09 16:57:01 +11:00
parent 6eb791ebf4
commit 96af4b94a1
2 changed files with 9 additions and 8 deletions
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15
src/processor/gpu.rs
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@ -169,7 +169,7 @@ impl CPU {
let mode_1_vblank_enabled = get_bit(stat, 4);
let mode_0_hblank_enabled = get_bit(stat, 3);
let lyc_eq_ly = self.memory.get(0xFF44) == self.memory.get(0xFF45);
let lyc_eq_ly = self.gpu.scanline == self.memory.get(0xFF45);
let mode_2 = self.gpu.mode == DrawMode::Mode2;
let mode_1_vblank = self.gpu.mode == DrawMode::VBlank;
let mode_0_hblank = self.gpu.mode == DrawMode::HBlank;
@ -232,18 +232,16 @@ impl CPU {
fn render_scanline_window(&mut self, scanline: u8, lcdc: &LCDC, palette: Palette) {
let pos_y = self.memory.get(0xFF4A);
// subtracting 7 to get the Real Number...
let pos_x = self.memory.get(0xFF4B).wrapping_sub(7);
if pos_y < 143 && pos_x < 166 {
let pos_x = self.memory.get(0xFF4B);
self.render_tiles(
scanline,
&lcdc.window_tilemap,
&lcdc.tile_area,
palette,
pos_x,
pos_x.wrapping_sub(7),
pos_y,
false,
)
}
);
}
fn render_scanline_obj(&mut self, scanline: u8, lcdc: &LCDC, bg_palette: Palette) {
@ -304,6 +302,9 @@ impl CPU {
let lsb = get_bit(lsbs, x_addr);
let msb = get_bit(msbs, x_addr);
let colour = bits_to_mapped_colour(lsb, msb, object.flags.palette);
if colour == object.flags.palette.zero {
continue;
}
let x_coord_uncorrected = (object.x as usize) + (px_x as usize);
if x_coord_uncorrected < 8 {
continue;
@ -331,7 +332,7 @@ impl CPU {
wrap: bool,
) {
let tile_line_y = scanline.wrapping_add(offset_y);
if (scanline as usize + offset_y as usize) % 0xFF > 0 && !wrap {
if ((scanline as usize + offset_y as usize) / 0xFF) > 0 && !wrap {
return;
}
let tilemap_row = tile_line_y / 8;

2
src/processor/gpu/types.rs
View file

@ -65,7 +65,7 @@ pub(super) struct LCDC {
pub(super) bg_window_enable: bool,
}
#[derive(Clone, Copy, Debug)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub(super) enum Colour {
White,
LightGray,