FranLMSP/rmg-001
1
0
Fork 0
mirror of https://github.com/FranLMSP/rmg-001.git synced 2026-08-05 17:50:04 -04:00
Code Issues Packages Projects Releases Wiki Activity

Experimental background rendering with scrolling

Browse Source
This commit is contained in:
Franco Colmenarez
2021-10-28 12:58:03 -05:00
parent ce4afa96bf
commit 6ad3f9f29b
2 changed files with 15 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/ppu.rs
+11 -10
View File
@@ -53,8 +53,8 @@ pub const FRAME_BUFFER_LENGTH: u32 = WIDTH * HEIGHT;
const LCD_CONTROL_ADDRESS: u16 = 0xFF40;
const LCD_STATUS_ADDRESS: u16 = 0xFF41;
const SCROLL_X_ADDRESS: u16 = 0xFF42;
const SCROLL_Y_ADDRESS: u16 = 0xFF43;
const SCROLL_Y_ADDRESS: u16 = 0xFF42;
const SCROLL_X_ADDRESS: u16 = 0xFF43;
const LCD_Y_ADDRESS: u16 = 0xFF44;
const LCD_Y_COMPARE_ADDRESS: u16 = 0xFF45;
const DMA_ADDRESS: u16 = 0xFF46;
@@ -180,19 +180,20 @@ impl PPU {
pub fn draw_background(&mut self, bus: &Bus) {
let mut idx = 0;
// let mut tile_line: u16 = 0;
let mut lcd_y: u16 = 0;
let mut lcd_y: u8 = 0;
while lcd_y < 144 {
let mut lcd_x: u16 = 0;
let mut lcd_x: u8 = 0;
while lcd_x < 160 {
let index_x = (lcd_x / 8);
let index_y = (lcd_y / 8) * 32;
let y = lcd_y.wrapping_add(PPU::get_scroll_y(bus));
let x = lcd_x.wrapping_add(PPU::get_scroll_x(bus));
let index_x = (x as u16 / 8);
let index_y = (y as u16 / 8) * 32;
let index = index_x + index_y;
let tile_line = (lcd_y + PPU::get_scroll_y(bus) as u16).rem_euclid(8) * 2;
let tile_line = (y).rem_euclid(8) * 2;
let index_byte = (bus.read(0x9800 + index as u16) as u16) * 16;
let tile_byte_1 = bus.read(0x8000 + tile_line + index_byte as u16);
let tile_byte_2 = bus.read(0x8000 + tile_line + index_byte as u16 + 1);
println!("{} {}", tile_byte_1, tile_byte_2);
let tile_byte_1 = bus.read(0x8000 + tile_line as u16 + index_byte);
let tile_byte_2 = bus.read(0x8000 + tile_line as u16 + index_byte + 1);
let pixels = PPU::get_byte_pixels(tile_byte_1, tile_byte_2);