working on texture tiles

game/src/utilities/mod.rs

@@ -1,3 +1,4 @@
+pub mod anim_render;
 pub mod datastore;
 pub mod discord;
 pub mod game_config;
@@ -6,4 +7,4 @@ pub mod math;
 pub mod non_ref_raylib;
 pub mod render_layer;
 pub mod shaders;
-pub mod anim_render;
+pub mod world_paint_texture;

game/src/utilities/world_paint_texture.rs

@@ -0,0 +1,56 @@
+//! Defines a texture that tiles across the whole screen in world space
+
+use raylib::{
+    camera::Camera2D,
+    color::Color,
+    math::Vector2,
+    prelude::{RaylibDraw, RaylibMode2D},
+    texture::Texture2D,
+    RaylibHandle,
+};
+
+use super::non_ref_raylib::HackedRaylibHandle;
+
+pub struct WorldPaintTexture {
+    texture: Texture2D,
+}
+
+impl WorldPaintTexture {
+    /// Construct a new world paint texture
+    pub fn new(texture: Texture2D) -> Self {
+        Self { texture }
+    }
+
+    pub fn render(
+        &self,
+        raylib: &mut RaylibMode2D<'_, HackedRaylibHandle>,
+        origin: Vector2,
+        camera: &Camera2D,
+    ) {
+        // Convert the screen edges to world space
+        let top_left = raylib.get_screen_to_world2D(Vector2::new(0.0, 0.0), camera);
+        let bottom_right = raylib.get_screen_to_world2D(raylib.get_screen_size(), camera);
+
+        // Calculate the distance between the edges and the origin
+        let left_edge_distance = top_left.x - origin.x;
+        let right_edge_distance = bottom_right.x - origin.x;
+
+        // Calculate the x position to draw the tile in order for there always to be a tile covering the edges
+        let left_tile_x =
+            (left_edge_distance / self.texture.width as f32).floor() * self.texture.width as f32;
+        let right_tile_x =
+            (right_edge_distance / self.texture.width as f32).ceil() * self.texture.width as f32;
+
+        // Render the tiles
+        raylib.draw_texture_v(
+            &self.texture,
+            Vector2::new(left_tile_x, origin.y),
+            Color::WHITE,
+        );
+        raylib.draw_texture_v(
+            &self.texture,
+            Vector2::new(right_tile_x, origin.y),
+            Color::WHITE,
+        );
+    }
+}