75 lines
2.3 KiB
Rust
75 lines
2.3 KiB
Rust
//! Original Mode 4/5 page-flipping demos. ARM code copies both images through
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//! BIOS services, samples input, and switches the displayed page during VBlank.
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use crate::{
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affine_demo,
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graphics_demo::{GraphicsDemo, GraphicsError},
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input::Buttons,
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machine::Machine,
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memory::MemoryError,
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video::Framebuffer,
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};
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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#[repr(u16)]
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pub enum BitmapMode {
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Mode4 = 4,
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Mode5 = 5,
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}
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/// Debug words: completed updates, signed pan X, signed pan Y.
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pub const BITMAP_STATE: u32 = 0x0200_0000;
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pub struct BitmapDemo {
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runner: GraphicsDemo,
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mode: BitmapMode,
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}
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impl BitmapDemo {
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pub fn new(mode: BitmapMode) -> Result<Self, MemoryError> {
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Ok(Self {
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runner: GraphicsDemo::with_program(affine_demo::bitmap_program(mode as u16))?,
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mode,
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})
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}
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pub fn machine(&self) -> &Machine {
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self.runner.machine()
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}
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pub fn frame(
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&mut self,
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buttons: Buttons,
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output: &mut Framebuffer,
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) -> Result<usize, GraphicsError> {
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self.runner
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.frame_with_control(buttons, output, 0x400 | self.mode as u16)
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}
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}
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pub(crate) fn assets(mode: u16) -> Vec<u8> {
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let mut palette = [0_u16; 256];
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palette[0] = 0x4000;
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for (i, color) in palette.iter_mut().enumerate().skip(1) {
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*color = ((i & 31) | (((i >> 3) & 31) << 5) | (((i * 3) & 31) << 10)) as u16;
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}
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let mut data: Vec<u8> = palette.into_iter().flat_map(u16::to_le_bytes).collect();
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let mut vram = vec![0_u8; 0x14000];
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let (width, height) = if mode == 4 { (240, 160) } else { (160, 128) };
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for page in 0..2 {
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for y in 0..height {
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for x in 0..width {
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let offset = y * width + x;
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if mode == 4 {
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vram[page * 0xa000 + offset] = ((x / 8 + 3 * (y / 8) + page * 64) & 255) as u8;
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} else {
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let color = (((x / 5 + page * 11) & 31)
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| (((y / 4 + page * 7) & 31) << 5)
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| (((x / 8 + y / 8 + page * 5) & 31) << 10))
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as u16;
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let address = page * 0xa000 + offset * 2;
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vram[address..address + 2].copy_from_slice(&color.to_le_bytes());
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}
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}
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}
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}
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data.extend(vram);
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data
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}
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