From 29c88a67ad4b373152b1f73a5163c22f347a86a8 Mon Sep 17 00:00:00 2001
From: Jason Hilder <jhilder95@gmail.com>
Date: Tue, 29 Sep 2026 07:54:09 +0200
Subject: [PATCH] Setup 2D Camera for shake effect.

---
 src/game.odin | 57 ++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 50 insertions(+), 7 deletions(-)

diff --git a/src/game.odin b/src/game.odin
index dd2ea06..83b9019 100644
--- a/src/game.odin
+++ b/src/game.odin
@@ -1,10 +1,9 @@
 package game
 
 import "core:strings"
+import "core:math/rand"
 import rl "vendor:raylib"
 
-// VIEWPORT_W   :: 1280
-// VIEWPORT_H   :: 720
 VIEWPORT_W   :: 640
 VIEWPORT_H   :: 360
 WINDOW_TITLE :: "Pong"
@@ -31,6 +30,11 @@ Game :: struct {
     should_close: bool,
     audio:        Audio_Manager,
 
+    // Camera state for screen effects / screen shake
+    camera:       rl.Camera2D,
+    shake_intensity: f32,
+    shake_timer: f32,
+
     // resolution state
     window_w: i32,
     window_h: i32,
@@ -78,6 +82,14 @@ game_init :: proc(game: ^Game) {
 
     game.crt_shader = rl.LoadShader(nil, "assets/shaders/crt.fs")
 
+    // Setup 2D camera matching the 640x360 viewport center
+    game.camera = rl.Camera2D{
+        target   = rl.Vector2{VIEWPORT_W / 2.0, VIEWPORT_H / 2.0},
+        offset   = rl.Vector2{VIEWPORT_W / 2.0, VIEWPORT_H / 2.0},
+        rotation = 0.0,
+        zoom     = 1.0,
+    }
+
     game.should_close = false
     set_root_scene(game, make_main_menu()) 
 }
@@ -86,6 +98,28 @@ game_update :: proc(game: ^Game) {
     dt := rl.GetFrameTime()
     input := poll_input()
 
+    // -------------------------------------------------------------------------
+    // Update Camera Shake
+    // -------------------------------------------------------------------------
+    base_center := rl.Vector2{VIEWPORT_W / 2.0, VIEWPORT_H / 2.0}
+
+    if game.shake_timer > 0 {
+        game.shake_timer -= dt
+
+        // Generate random offset within current intensity bounds
+        offset_x := (f32(rand.float32()) * 2.0 - 1.0) * game.shake_intensity
+        offset_y := (f32(rand.float32()) * 2.0 - 1.0) * game.shake_intensity
+
+        game.camera.target = base_center + rl.Vector2{offset_x, offset_y}
+
+        if game.shake_timer <= 0 {
+            game.shake_intensity = 0.0
+            game.camera.target = base_center
+        }
+    } else {
+        game.camera.target = base_center
+    }
+
     active_scene := get_active_scene(game)
     if active_scene != nil {
         scene_update(active_scene, game, input, dt)
@@ -105,12 +139,16 @@ game_render :: proc(game: ^Game) {
     rl.BeginTextureMode(game.viewport)
         rl.DrawTexture(game.bg_texture, 0, 0, rl.WHITE)        
 
-        // @note: fine for now but probably not a good idea...
-        // Render all scenes in the stack from bottom to top
-        for i in 0 ..< len(game.scene_stack) {
-            scene_render(&game.scene_stack[i])
-        }
+        // World/Scene objects rendered through 2D camera space
+        rl.BeginMode2D(game.camera)        
 
+            // @note: fine for now but probably not a good idea...
+            // Render all scenes in the stack from bottom to top
+            for i in 0 ..< len(game.scene_stack) {
+                scene_render(&game.scene_stack[i])
+            }
+
+        rl.EndMode2D()
     rl.EndTextureMode()
 
     render_game_to_window(game)
@@ -136,6 +174,11 @@ game_should_run :: proc(game: Game) -> bool {
     return !game.should_close && !rl.WindowShouldClose()
 }
 
+game_trigger_shake :: proc(game: ^Game, intensity: f32, duration: f32 = 0.15) {
+    game.shake_intensity = max(game.shake_intensity, intensity)
+    game.shake_timer = duration 
+}
+
 // ------------------------------------------------------------------------------
 // Window Upscale Render 
 // ------------------------------------------------------------------------------