add some collider logic

mise.toml

@@ -1,4 +1,4 @@
 [tasks]
 build_web = "$HOME/bin/jai/bin/jai-linux first.jai - wasm release && rm -rf dist/packs/ && cp -r packs/ dist/ && rm dist/main.o"
 ship_web  = "./game/ship_web.sh"
-run       = "$HOME/bin/jai/bin/jai-linux first.jai && ./first"
+start       = "$HOME/bin/jai/bin/jai-linux first.jai && ./first"

src/main.jai

@@ -15,6 +15,7 @@ String :: #import "String";
 Jaison :: #import "Jaison";
 stbi   :: #import "stb_image";
 
+#load "pseudophysics/core.jai";
 #load "trile.jai";
 #load "rendering/rendering.jai";
 #load "input/hotkeys.jai";

src/pseudophysics/colliders.jai

@@ -0,0 +1,27 @@
+Collision_Rect :: struct {
+    width  : float;
+    height : float;
+    position : Vector2;
+}
+
+Collision_Circle :: struct {
+    radius : float;
+    position : Vector2;
+}
+
+Collision_Result :: struct {
+    hit            : bool;
+    collisionDepth : float;
+}
+
+check_collision :: (rect: Collision_Rect, circle: Collision_Circle) -> Collision_Result {
+    closestX := max(rect.position.x - (rect.width / 2.0), min(circle.position.x, rect.position.x + (rect.width / 2.0)));
+    closestY := max(rect.position.y - (rect.height / 2.0), min(circle.position.y, rect.position.y + (rect.height / 2.0)));
+    distanceX := circle.position.x - closestX;
+    distanceY := circle.position.y - closestY;
+    distanceSquared := (distanceX * distanceX) + (distanceY*distanceY);
+    radiusSquared := circle.radius * circle.radius;
+    return Collision_Result.{
+        hit = distanceSquared <= radiusSquared
+    };
+}

src/pseudophysics/core.jai

@@ -0,0 +1 @@
+#load "colliders.jai";