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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, Sub};
use dungeon::{Dungeon, Entity, Floor, MAP_SIZE, Player, Pos, Tile};
use raylib::{
RaylibThread,
color::Color,
math::{Rectangle, 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);
FrameRenderer {
handle: draw_handle,
thread,
renderer: self,
}
}
}
/// 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,
}
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 the current render width
fn render_width(&self) -> i32 {
self.handle.get_render_width()
}
/// Returns the current render height
fn render_height(&self) -> i32 {
self.handle.get_render_height()
}
/// Returns the wanted map tile size
fn tile_size(&self) -> i32 {
// the pixl size we will base everything on
let size = self.render_width().max(self.render_height());
// min visible tiles
let dist = VIEW_DISTANCE * 2 + 1;
// get crude number of pixles
// TODO: force scaling levels
size.div(dist).max(16)
}
/// Clear the screen
pub 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<()> {
// Clear the background to black
self.clear();
// Draw the dungeon
self.draw_tiles(dungeon)?;
self.draw_player(&dungeon.player);
// Draw the ui
self.draw_ui(dungeon);
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();
}
/// Draw the player sprite
pub fn draw_player(&mut self, player: &Player) {
self.draw_entity(&player.entity);
}
/// Draws an entity
#[expect(clippy::unused_self)]
pub fn draw_entity(&mut self, _entity: &Entity) {
// TODO:
}
/// 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
let size = self.tile_size() as f32;
let dist = VIEW_DISTANCE as f32;
let camera = Vector2::from(dungeon.camera().xy());
let source_rec = Rectangle::new(
camera.x.sub(dist).max(0.0) * size,
camera.y.sub(dist).max(0.0) * size,
size * (dist * 2.0 + 1.0),
size * (dist * 2.0 + 1.0),
);
self.handle
.draw_texture_rec(&tex, source_rec, Vector2::zero(), 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,
}
}
|
