From cfd7d479ec7d0bae4a7b7a10eafb5a2d977fa040 Mon Sep 17 00:00:00 2001
From: gered <gered@blarg.ca>
Date: Wed, 29 Mar 2023 15:43:58 -0400
Subject: [PATCH] add variable_screen_size example project

not a super exciting project. might be removed later on when i
eventually get to adding more exciting examples
---
 examples/variable_screen_size/Cargo.toml      |  10 ++
 .../assets/arena.map.json                     |   9 ++
 examples/variable_screen_size/assets/db16.pal | Bin 0 -> 768 bytes
 examples/variable_screen_size/assets/dp.fnt   | Bin 0 -> 2305 bytes
 .../variable_screen_size/assets/tiles.pcx     | Bin 0 -> 33941 bytes
 examples/variable_screen_size/src/main.rs     | 139 ++++++++++++++++++
 6 files changed, 158 insertions(+)
 create mode 100644 examples/variable_screen_size/Cargo.toml
 create mode 100644 examples/variable_screen_size/assets/arena.map.json
 create mode 100644 examples/variable_screen_size/assets/db16.pal
 create mode 100644 examples/variable_screen_size/assets/dp.fnt
 create mode 100644 examples/variable_screen_size/assets/tiles.pcx
 create mode 100644 examples/variable_screen_size/src/main.rs

diff --git a/examples/variable_screen_size/Cargo.toml b/examples/variable_screen_size/Cargo.toml
new file mode 100644
index 0000000..c3edcde
--- /dev/null
+++ b/examples/variable_screen_size/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "variable_screen_size"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "=1.0.55"
+ggdt = { path = "../../ggdt" }
+serde = { version = "1.0.136", features = ["derive"] }
+serde_json = "1.0.79"
diff --git a/examples/variable_screen_size/assets/arena.map.json b/examples/variable_screen_size/assets/arena.map.json
new file mode 100644
index 0000000..d1e4a6f
--- /dev/null
+++ b/examples/variable_screen_size/assets/arena.map.json
@@ -0,0 +1,9 @@
+{
+  "width":40,
+  "height":30,
+  "layers":[
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+  ]
+}
\ No newline at end of file
diff --git a/examples/variable_screen_size/assets/db16.pal b/examples/variable_screen_size/assets/db16.pal
new file mode 100644
index 0000000000000000000000000000000000000000..869edaafb7a8f927e9b62f09faca07d455db41fe
GIT binary patch
literal 768
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NupdREAuw!0008_`dx!u4

literal 0
HcmV?d00001

diff --git a/examples/variable_screen_size/assets/dp.fnt b/examples/variable_screen_size/assets/dp.fnt
new file mode 100644
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HcmV?d00001

diff --git a/examples/variable_screen_size/src/main.rs b/examples/variable_screen_size/src/main.rs
new file mode 100644
index 0000000..e3309c1
--- /dev/null
+++ b/examples/variable_screen_size/src/main.rs
@@ -0,0 +1,139 @@
+use anyhow::{Context, Result};
+use serde::Deserialize;
+
+use ggdt::prelude::*;
+
+const TILE_WIDTH: u32 = 16;
+const TILE_HEIGHT: u32 = 16;
+
+fn load_palette(path: &std::path::Path) -> Result<Palette> {
+	Palette::load_from_file(path, PaletteFormat::Vga).context(format!("Loading palette: {:?}", path))
+}
+
+fn load_font(path: &std::path::Path) -> Result<BitmaskFont> {
+	BitmaskFont::load_from_file(path).context(format!("Loading font: {:?}", path))
+}
+
+fn load_bitmap_atlas_autogrid(path: &std::path::Path) -> Result<BitmapAtlas<IndexedBitmap>> {
+	let (bmp, _) = IndexedBitmap::load_file(path).context(format!("Loading bitmap atlas: {:?}", path))?;
+	let mut atlas = BitmapAtlas::new(bmp);
+	atlas.add_grid(TILE_WIDTH, TILE_HEIGHT)?;
+	Ok(atlas)
+}
+
+#[derive(Debug, Deserialize)]
+struct TileMap {
+	width: u32,
+	height: u32,
+	layers: Vec<Box<[i32]>>,
+}
+
+impl TileMap {
+	pub fn load_from(path: &std::path::Path) -> Result<Self> {
+		let f = std::fs::File::open(path)?;
+		let reader = std::io::BufReader::new(f);
+		serde_json::from_reader(reader).context(format!("Loading json tilemap: {:?}", path))
+	}
+
+	#[inline]
+	pub fn index_to(&self, x: i32, y: i32) -> Option<usize> {
+		if x >= 0 && y >= 0 && x < self.width as i32 && y < self.height as i32 {
+			Some(((y * self.width as i32) + x) as usize)
+		} else {
+			None
+		}
+	}
+
+	pub fn draw(&self, dest: &mut IndexedBitmap, tiles: &BitmapAtlas<IndexedBitmap>, camera_x: i32, camera_y: i32) {
+		let xt = camera_x / TILE_WIDTH as i32;
+		let yt = camera_y / TILE_HEIGHT as i32;
+		let xp = camera_x % TILE_WIDTH as i32;
+		let yp = camera_y % TILE_HEIGHT as i32;
+
+		let tiles_y = (dest.height() as f32 / TILE_HEIGHT as f32).ceil() as i32 + 1;
+		let tiles_x = (dest.width() as f32 / TILE_WIDTH as f32).ceil() as i32 + 1;
+
+		for y in 0..tiles_y {
+			for x in 0..tiles_x {
+				if let Some(index) = self.index_to(x + xt, y + yt) {
+					let xd = (x * TILE_WIDTH as i32) - xp;
+					let yd = (y * TILE_HEIGHT as i32) - yp;
+
+					let lower = self.layers[0][index];
+					if lower >= 0 {
+						dest.blit_region(IndexedBlitMethod::Solid, tiles.bitmap(), &tiles[lower as usize], xd, yd);
+					}
+					let upper = self.layers[1][index];
+					if upper >= 0 {
+						dest.blit_region(
+							IndexedBlitMethod::Transparent(0),
+							tiles.bitmap(),
+							&tiles[upper as usize],
+							xd,
+							yd,
+						);
+					}
+				}
+			}
+		}
+	}
+}
+
+fn main() -> Result<()> {
+	let config = DosLikeConfig::variable_screen_size(320, 240).scale_factor(3);
+	let mut system = SystemBuilder::new() //
+		.window_title("Variable Screen Size")
+		.vsync(true)
+		.build(config)?;
+
+	let palette = load_palette(std::path::Path::new("./assets/db16.pal"))?;
+	let font = load_font(std::path::Path::new("./assets/dp.fnt"))?;
+	let tiles = load_bitmap_atlas_autogrid(std::path::Path::new("./assets/tiles.pcx"))?;
+	let tilemap = TileMap::load_from(std::path::Path::new("./assets/arena.map.json"))?;
+
+	system.res.palette = palette;
+	system.res.cursor.enable_cursor(true);
+
+	let mut camera_x = 0;
+	let mut camera_y = 0;
+
+	while !system.do_events()? {
+		if system.res.keyboard.is_key_pressed(Scancode::Escape) {
+			break;
+		}
+		if system.res.mouse.is_button_down(1) {
+			camera_x -= system.res.mouse.x_delta() * 2;
+			camera_y -= system.res.mouse.y_delta() * 2;
+		}
+
+		system.update()?;
+
+		system.res.video.clear(0);
+		tilemap.draw(&mut system.res.video, &tiles, camera_x, camera_y);
+
+		system.res.video.print_string(
+			&format!(
+				"Camera: {}, {}\nDisplay Size: {}, {}",
+				camera_x,
+				camera_y,
+				system.res.video.width(),
+				system.res.video.height()
+			),
+			10,
+			10,
+			FontRenderOpts::Color(15),
+			&font,
+		);
+		system.res.video.print_string(
+			"Click-and-drag to scroll",
+			10,
+			system.res.video.height() as i32 - 20,
+			FontRenderOpts::Color(15),
+			&font,
+		);
+
+		system.display()?;
+	}
+
+	Ok(())
+}