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Minor PPU optimizations

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This commit is contained in:
Franco Colmenarez 2021-11-14 21:35:18 -05:00
parent d4e8ec1f3f
commit d601f2e67e
1 changed files with 23 additions and 22 deletions
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33
src/ppu.rs
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@ -253,10 +253,6 @@ impl PPU {
return;
}
self.lcd_y = bus.read(LCD_Y_ADDRESS);
self.scroll_x = bus.read(SCROLL_X_ADDRESS);
self.scroll_y = bus.read(SCROLL_Y_ADDRESS);
self.window_x = bus.read(WINDOW_X_ADDRESS);
self.window_y = bus.read(WINDOW_Y_ADDRESS);
if self.lcd_y < 144 {
if self.cycles.0 <= 80 && !PPU::get_lcd_status(bus, LCDStatus::ModeFlag(LCDStatusModeFlag::SearchingOAM)) {
@ -266,6 +262,10 @@ impl PPU {
self.oam_search(bus);
} else if self.cycles.0 > 80 && self.cycles.0 <= 80 + 172 && !PPU::get_lcd_status(bus, LCDStatus::ModeFlag(LCDStatusModeFlag::TransferringToLCD)) {
// Mode 3 drawing pixel line. This could also last 289 cycles
self.scroll_x = bus.read(SCROLL_X_ADDRESS);
self.scroll_y = bus.read(SCROLL_Y_ADDRESS);
self.window_x = bus.read(WINDOW_X_ADDRESS);
self.window_y = bus.read(WINDOW_Y_ADDRESS);
PPU::set_lcd_status(bus, LCDStatus::ModeFlag(LCDStatusModeFlag::TransferringToLCD), true);
self.draw_line(bus, frame_buffer);
} else if self.cycles.0 > 80 + 172 && self.cycles.0 <= 80 + 172 + 204 && !PPU::get_lcd_status(bus, LCDStatus::ModeFlag(LCDStatusModeFlag::HBlank)) {
@ -333,10 +333,10 @@ impl PPU {
}
fn oam_search(&mut self, bus: &Bus) {
self.sprite_buffer = Vec::new();
if !self.get_lcd_control(bus, LCDControl::ObjectEnable) {
return;
}
self.sprite_buffer = Vec::new();
let palette_0 = bus.read(OBJECT_PALETTE_0_ADDRESS);
let palette_1 = bus.read(OBJECT_PALETTE_1_ADDRESS);
let long_sprites = self.get_lcd_control(bus, LCDControl::ObjectSize);
@ -471,14 +471,17 @@ impl PPU {
}
fn get_window_pixel(&mut self, lcd_x: u8, bus: &Bus) -> Option<Pixel> {
if !self.get_lcd_control(bus, LCDControl::WindowEnable) {
return None;
}
let lcd_y = self.lcd_y;
let window_x = self.window_x;
let window_y = self.window_y;
if
!self.get_lcd_control(bus, LCDControl::WindowEnable) ||
lcd_x < window_x.saturating_sub(7) ||
lcd_y < window_y ||
lcd_x < window_x.saturating_sub(7) ||
window_y >= 144 ||
window_x.saturating_sub(7) >= 160
{
@ -565,21 +568,19 @@ impl PPU {
while (lcd_x as u32) < LCD_WIDTH {
let idx = (lcd_x as usize + (lcd_y as usize * LCD_WIDTH as usize)) * 4;
if let Some(background_pixel) = self.get_background_pixel(lcd_x, bus) {
let rgba = PPU::get_rgba(background_pixel, BACKGROUND_COLORS);
frame_buffer[idx] = rgba[0];
frame_buffer[idx + 1] = rgba[1];
frame_buffer[idx + 2] = rgba[2];
frame_buffer[idx + 3] = rgba[3];
}
if let Some(window_pixel) = self.get_window_pixel(lcd_x, bus) {
window_drawn = true;
let rgba = PPU::get_rgba(window_pixel, WINDOW_COLORS);
frame_buffer[idx] = rgba[0];
frame_buffer[idx + 1] = rgba[1];
frame_buffer[idx + 2] = rgba[2];
frame_buffer[idx + 3] = rgba[3];
} else if let Some(background_pixel) = self.get_background_pixel(lcd_x, bus) {
let rgba = PPU::get_rgba(background_pixel, BACKGROUND_COLORS);
frame_buffer[idx] = rgba[0];
frame_buffer[idx + 1] = rgba[1];
frame_buffer[idx + 2] = rgba[2];
}
if self.get_lcd_control(bus, LCDControl::ObjectEnable) {
if let Some((sprite_pixel, palette_zero)) = self.find_sprite_pixel(lcd_x, bus) {
let rgba = PPU::get_rgba(sprite_pixel, match palette_zero {
true => SPRITE_0_COLORS,
@ -588,7 +589,7 @@ impl PPU {
frame_buffer[idx] = rgba[0];
frame_buffer[idx + 1] = rgba[1];
frame_buffer[idx + 2] = rgba[2];
frame_buffer[idx + 3] = rgba[3];
}
}
lcd_x += 1;