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|
//! The `render` module contains the structures for displaying
//! the game, with each frame represented by a `Renderer` and
//! frame specific information in `FrameInfo`.
/// The (prefered) view distance of the game
const VIEW_DISTANCE: i32 = 10;
use std::ops::Div;
use dungeon::{Dungeon, Entity, Floor, MAP_SIZE, Pos, Tile};
use raylib::{
RaylibThread,
camera::Camera2D,
color::Color,
ffi,
math::Vector2,
prelude::{RaylibDraw, RaylibDrawHandle, RaylibHandle, RaylibTextureModeExt},
texture::RenderTexture2D,
};
use crate::assets::ImageData;
/// The `Renderer` struct is the persistant renderer
/// for the duration for the application.
#[derive(Debug)]
pub struct Renderer {
/// Set of sprites to be drawn
image: ImageData,
/// Pre-rendered map texture that updates if the map changes
/// Stores the hash of the map tiles to check this
tiles: Option<(u64, RenderTexture2D)>,
}
impl Renderer {
pub(crate) fn new(image: ImageData) -> Self {
Self { image, tiles: None }
}
/// Invokes the renderer for the current frame
pub(crate) fn invoke<'a>(
&'a mut self,
handle: &'a mut RaylibHandle,
thread: &'a RaylibThread,
) -> FrameRenderer<'a> {
let draw_handle = handle.begin_drawing(thread);
// calculate the scaling factor
let width = draw_handle.get_render_width();
let height = draw_handle.get_render_height();
let tile_size = {
let size = width.max(height);
let dist = VIEW_DISTANCE * 2 + 1;
// TODO: force by 16 scaling levels
size.div(dist).max(16)
};
FrameRenderer {
handle: draw_handle,
thread,
renderer: self,
tile_size,
}
}
}
/// A `FrameRenderer` is a renderer for a single
/// frame of the game. It is created per frame.
pub struct FrameRenderer<'a> {
/// The current draw handle for raylib
handle: RaylibDrawHandle<'a>,
/// The raylib thread
thread: &'a RaylibThread,
/// Mutable reference to the main renderer (stores persistant data)
renderer: &'a mut Renderer,
/// The tile size for this frame
tile_size: i32,
}
impl<'a> FrameRenderer<'a> {
/// Returns last computed fps
fn fps(&self) -> u32 {
self.handle.get_fps()
}
/// Returns image data
#[expect(dead_code)]
fn image(&self) -> &ImageData {
&self.renderer.image
}
/// Returns a raylib camera for the given position
#[must_use]
fn camera(&self, dungeon: &Dungeon) -> Camera2D {
let cpos = dungeon.camera();
let width = self.handle.get_render_width();
let height = self.handle.get_render_height();
Camera2D {
target: Vector2::from(cpos.xy()).scale_by(self.tile_size as f32),
offset: Vector2::new(width as f32 / 2.0, height as f32 / 2.0),
rotation: 0.0,
zoom: 1.0,
}
}
/// Clear the screen
fn clear(&mut self) {
self.handle.clear_background(Color::BLACK);
}
/// Draws an entire frame
///
/// # Examples
/// ```no_run
/// use dungeon::Dungeon;
/// use graphics::Window;
/// let mut window = Window::new(800, 600, "Dungeon Crawl").unwrap();
/// let mut renderer = window.renderer();
/// let dungeon = Dungeon::new();
/// renderer.draw_frame(&dungeon);
/// ```
pub fn draw_frame(&mut self, dungeon: &Dungeon) -> crate::Result<()> {
self.clear();
self.draw_dungeon(dungeon)?;
self.draw_ui(dungeon);
Ok(())
}
/// Draws the dungeon, (tiles and entities)
pub fn draw_dungeon(&mut self, dungeon: &Dungeon) -> crate::Result<()> {
let camera = self.camera(dungeon);
unsafe {
ffi::BeginMode2D(camera.into());
}
self.draw_tiles(dungeon)?;
self.draw_entities(dungeon);
unsafe {
ffi::EndMode2D();
}
Ok(())
}
/// Draws player HP, inventory, and floor number
pub fn draw_ui(&mut self, _dungeon: &Dungeon) {
#[cfg(feature = "debug")]
// Draw fps (debug only)
self.draw_fps();
}
/// Draws the entities on the map
pub fn draw_entities(&mut self, dungeon: &Dungeon) {
self.draw_entity(&dungeon.player.entity);
}
/// Draws an entity
#[expect(clippy::cast_possible_truncation)]
pub fn draw_entity(&mut self, entity: &Entity) {
let size = self.tile_size;
let x = (entity.fpos.x() * size as f32) as i32;
let y = (entity.fpos.y() * size as f32) as i32;
// TODO: per entity color
self.handle.draw_rectangle(x, y, size, size, Color::GREEN);
}
/// Draw dungeon tiles
pub fn draw_tiles(&mut self, dungeon: &Dungeon) -> crate::Result<()> {
let hash = dungeon.floor.hash();
let tex = match self.renderer.tiles.take() {
Some((h, tex)) if hash == h => tex,
_ => self.draw_tiles_to_tex(&dungeon.floor)?,
};
// caculate the starting postion on the texture to draw from
self.handle.draw_texture(&tex, 0, 0, Color::WHITE);
// save the texture
self.renderer.tiles.replace((hash, tex));
Ok(())
}
/// Draw tiles on a provided texture
fn draw_tiles_to_tex(&mut self, floor: &Floor) -> crate::Result<RenderTexture2D> {
let size = self.tile_size;
let pixels = (MAP_SIZE as i32) * size;
let mut tex =
self.handle
.load_render_texture(self.thread, pixels as u32, pixels as u32)?;
// draw the tiles to the texture
{
let mut handle = self.handle.begin_texture_mode(self.thread, &mut tex);
handle.clear_background(Color::BLACK);
for pos in Pos::values() {
let (x, y) = pos.xy();
let color = tile_color(floor.get(pos));
handle.draw_rectangle(x as i32 * size, y as i32 * size, size, size, color);
}
}
Ok(tex)
}
/// Draw FPS counter
pub fn draw_fps(&mut self) {
let fps_str = format!("{}", self.fps());
self.handle.draw_text(&fps_str, 10, 10, 30, Color::YELLOW);
}
}
fn tile_color(tile: Tile) -> Color {
// TODO: use textures instead of colors :)
match tile {
Tile::Wall => Color::BLUE,
Tile::Air => Color::RED,
Tile::Stairs => Color::GRAY,
}
}
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