add some notes about design problems in quickwings

CONTRIBUTORS.md

@@ -0,0 +1,6 @@
+# Contributors
+
+- Hartmut Seichter (dev lead)
+- Robin Rottstädt (image loader)
+- Tim Gösselmann (Win32 fixes)
+- Hannes Brothuhn (Flappy Bird clone)

docs/README.md

@@ -4,6 +4,7 @@ Here some ideas for improving this tiny engine:
 
 ## Rendering
 - [ ] replace the OpenGL renderer with a Vulkan backend
+- [ ] add sprite atlas support (test case Kenny flappy bird)
 - [ ] add animatable sprites (access to UV mapping and tiling)
 - [ ] add a SDF based renderer (parametric tiles and font rendering)
 
@@ -15,11 +16,11 @@ Here some ideas for improving this tiny engine:
 ## System Level
 
 - [ ] add a `Asset` handler to load cache and manage assets
-- [ ] introspection of file system if we load assset
+- [ ] introspection of file system if we load asset
 
 ## Design
 
-- [ ] replace some of the 'unkown source' assets
+- [ ] replace some of the 'unknown source' assets
 
 ## Build / Dev Support
 - [ ] add a test rig either with Snitch or Catch2
@@ -27,10 +28,11 @@ Here some ideas for improving this tiny engine:
 - [ ] add CPU and GPU benchmarks to address various issues
 
 
-# Issues
+# Performance
 
+For such a small engine, this should never happen:
 
-```sh
+```bash
  Performance counter stats for 'bin/paradiso_pong':
 
             555,35 msec task-clock:u                     #    0,042 CPUs utilized

examples/quickwings/quickwings.cpp

@@ -1,8 +1,7 @@
 /**
  * paradiso - Paradigmen der Softwareentwicklung
  *
- * (c) Copyright 2023-2025 Hartmut Seichter and Contributors, Robin Rottstädt,
- * brxxh (Hannes Brothuhn)
+ * (c) Copyright 2023-2025 Hartmut Seichter and Contributors
  *
  */
 
@@ -13,12 +12,16 @@
 #include <paradiso/renderer.hpp>
 #include <paradiso/shader.hpp>
 #include <paradiso/sprite.hpp>
+#include <paradiso/utils.hpp>
 #include <paradiso/vector.hpp>
 #include <paradiso/window.hpp>
 
 #include <chrono>
 #include <thread>
 
+// TODO remove all hard coded 'magic' values!
+
+// TODO - remove global variables
 const int frame_rate = 60;
 bool game_over = false;
 float risky_pos_x;
@@ -38,6 +41,7 @@ struct Background {
 
     paradiso::Renderer renderer{};
 
+    // TODO no constructors in rule of zero
     Background() {
         auto backgroundImage =
             paradiso::BitmapIO::get().load("background-day.png");
@@ -91,6 +95,8 @@ struct Pipe {
 
     bool pos_reset = false;
 
+    // TODO no constructors in rule of zero
+
     Pipe() {
         auto pipe_image = paradiso::BitmapIO::get().load("pipe-green.png");
 
@@ -115,6 +121,8 @@ struct Pipe {
 
     void update() {
 
+        // TODO improve state handling
+
         if (game_over == true) {
             paused = true;
         }
@@ -174,6 +182,7 @@ struct Grass {
     paradiso::Renderer renderer1{};
     paradiso::Renderer renderer2{};
 
+    // TODO no constructors in rule of zero
     Grass() {
         auto grassImage = paradiso::BitmapIO::get().load("base.png");
         grassLeft = paradiso::Sprite{
@@ -244,6 +253,7 @@ struct QuickWings {
 
     int collision_counter = 0;
 
+    // TODO no constructors in rule of zero
     QuickWings() {
         float scaleh = 0.08f;
         float scalew = 0.158f;