feat: high resolution debug rendering

src/systems/debug.rs

@@ -0,0 +1,143 @@
+//! Debug rendering system
+use crate::constants::BOARD_PIXEL_OFFSET;
+use crate::map::builder::Map;
+use crate::systems::components::Collider;
+use crate::systems::movement::Position;
+use crate::systems::render::BackbufferResource;
+use bevy_ecs::prelude::*;
+use sdl2::pixels::Color;
+use sdl2::rect::Rect;
+use sdl2::render::{Canvas, Texture};
+use sdl2::video::Window;
+
+#[derive(Resource, Default, Debug, Copy, Clone, PartialEq)]
+pub enum DebugState {
+    #[default]
+    Off,
+    Graph,
+    Collision,
+}
+
+impl DebugState {
+    pub fn next(&self) -> Self {
+        match self {
+            DebugState::Off => DebugState::Graph,
+            DebugState::Graph => DebugState::Collision,
+            DebugState::Collision => DebugState::Off,
+        }
+    }
+}
+
+/// Resource to hold the debug texture for persistent rendering
+pub struct DebugTextureResource(pub Texture<'static>);
+
+/// Transforms a position from logical canvas coordinates to output canvas coordinates
+fn transform_position(pos: (f32, f32), output_size: (u32, u32), logical_size: (u32, u32)) -> (i32, i32) {
+    let scale_x = output_size.0 as f32 / logical_size.0 as f32;
+    let scale_y = output_size.1 as f32 / logical_size.1 as f32;
+    let scale = scale_x.min(scale_y); // Use the smaller scale to maintain aspect ratio
+
+    let x = (pos.0 * scale) as i32;
+    let y = (pos.1 * scale) as i32;
+    (x, y)
+}
+
+/// Transforms a position from logical canvas coordinates to output canvas coordinates (with board offset)
+fn transform_position_with_offset(pos: (f32, f32), output_size: (u32, u32), logical_size: (u32, u32)) -> (i32, i32) {
+    let scale_x = output_size.0 as f32 / logical_size.0 as f32;
+    let scale_y = output_size.1 as f32 / logical_size.1 as f32;
+    let scale = scale_x.min(scale_y); // Use the smaller scale to maintain aspect ratio
+
+    let x = ((pos.0 + BOARD_PIXEL_OFFSET.x as f32) * scale) as i32;
+    let y = ((pos.1 + BOARD_PIXEL_OFFSET.y as f32) * scale) as i32;
+    (x, y)
+}
+
+/// Transforms a size from logical canvas coordinates to output canvas coordinates
+fn transform_size(size: f32, output_size: (u32, u32), logical_size: (u32, u32)) -> u32 {
+    let scale_x = output_size.0 as f32 / logical_size.0 as f32;
+    let scale_y = output_size.1 as f32 / logical_size.1 as f32;
+    let scale = scale_x.min(scale_y); // Use the smaller scale to maintain aspect ratio
+
+    (size * scale) as u32
+}
+
+pub fn debug_render_system(
+    mut canvas: NonSendMut<&mut Canvas<Window>>,
+    backbuffer: NonSendMut<BackbufferResource>,
+    mut debug_texture: NonSendMut<DebugTextureResource>,
+    debug_state: Res<DebugState>,
+    map: Res<Map>,
+    colliders: Query<(&Collider, &Position)>,
+) {
+    if *debug_state == DebugState::Off {
+        return;
+    }
+
+    // Get canvas sizes for coordinate transformation
+    let output_size = canvas.output_size().unwrap();
+    let logical_size = canvas.logical_size();
+
+    // Copy the current backbuffer to the debug texture
+    canvas
+        .with_texture_canvas(&mut debug_texture.0, |debug_canvas| {
+            // Clear the debug canvas
+            debug_canvas.set_draw_color(Color::BLACK);
+            debug_canvas.clear();
+
+            // Copy the backbuffer to the debug canvas
+            debug_canvas.copy(&backbuffer.0, None, None).unwrap();
+        })
+        .unwrap();
+
+    // Draw debug info on the high-resolution debug texture
+    canvas
+        .with_texture_canvas(&mut debug_texture.0, |debug_canvas| match *debug_state {
+            DebugState::Graph => {
+                debug_canvas.set_draw_color(Color::RED);
+                for (start_node, end_node) in map.graph.edges() {
+                    let start_node = map.graph.get_node(start_node).unwrap().position;
+                    let end_node = map.graph.get_node(end_node.target).unwrap().position;
+
+                    // Transform positions using common method
+                    let (start_x, start_y) =
+                        transform_position_with_offset((start_node.x, start_node.y), output_size, logical_size);
+                    let (end_x, end_y) = transform_position_with_offset((end_node.x, end_node.y), output_size, logical_size);
+
+                    debug_canvas.draw_line((start_x, start_y), (end_x, end_y)).unwrap();
+                }
+
+                debug_canvas.set_draw_color(Color::BLUE);
+                for node in map.graph.nodes() {
+                    let pos = node.position;
+
+                    // Transform position using common method
+                    let (x, y) = transform_position_with_offset((pos.x, pos.y), output_size, logical_size);
+                    let size = transform_size(4.0, output_size, logical_size);
+
+                    debug_canvas
+                        .fill_rect(Rect::new(x - (size as i32 / 2), y - (size as i32 / 2), size, size))
+                        .unwrap();
+                }
+            }
+            DebugState::Collision => {
+                debug_canvas.set_draw_color(Color::GREEN);
+                for (collider, position) in colliders.iter() {
+                    let pos = position.get_pixel_pos(&map.graph).unwrap();
+
+                    // Transform position and size using common methods
+                    let (x, y) = transform_position((pos.x, pos.y), output_size, logical_size);
+                    let size = transform_size(collider.size, output_size, logical_size);
+
+                    // Center the collision box on the entity
+                    let rect = Rect::new(x - (size as i32 / 2), y - (size as i32 / 2), size, size);
+                    debug_canvas.draw_rect(rect).unwrap();
+                }
+            }
+            _ => {}
+        })
+        .unwrap();
+
+    // Draw the debug texture directly onto the main canvas at full resolution
+    canvas.copy(&debug_texture.0, None, None).unwrap();
+}