Full features list:

Cross-platform features:

Custom bash scripts transparent to source tree (folders are only used for better structure) - moved to makefiles, script (~~apr.sh~~) is now obsolete
Math library
- 2D, 3D and 4D vectors
- 3x3 matrices
  - multiplication
  - normal matrix calculation
- 4x4 matrices
  - multiplication
  - rotation (over X,Y,Z or random axis), translation and scaling
  - frustrum, orthographic and perspective
  - inverse and transpose
  - object and camera look-at
- Axis aligned bounding boxes (AABB for both 1D and 2D)
- Plane
- Frustrum
  - reconstruction from view-projection matrix
  - intersection with point
  - intersection with sphere
- Sphere-sphere intersection
- 2D triangle determinant
- Line-line intersection
- Tangent/bitangent calculation (for normal/bump/parallax mapping)
Time service
Transparent resource system (automatic switch from assets to SD files or MVFS files)
OpenGL 2.0 graphics service
- Shader loading and management
- Generic buffer object (VBO/IBO possibly PBO for OpenGL 3.0)
- 2D Texture loading
  - support multiple filtering types (Point,Bilinear and Trilinear)
  - load from RAW data, file or build-blank
  - wraping mode
- Sprite rendering system
  - Multi-layer sprite batcher (batch merging for each layer)
  - Basic sprites
  - Animated sprites
  - Tiled background with parallax effect
  - Multiple shading options built in fragment shader:
    - alpha blending, alpha testing and none (does not take care of alpha)
    - per vertex color
  - Debug polygon and circle rendering
- Custom render calls
- Texture mapped font rendering
  - load from raw font texture (16x16 grid, one per character)
  - render as monospaced font
  - automatic construction
  - font size and color
  - centering/alignment
- Particle system
  - full flexibility
  - emitters (spawner)
    - circle emitter
  - effectors (modifier)
    - acceleration (gravity)
    - linear interpolation between 2 colors
- Post effect rendering (pipelined) with built in:
  - FXAAI
  - FXAAII
- Camera system
  - 2D camera (follow an object and spring system)
  - 3D generic camera
  - 3D free camera
- Basic UI scaling helper functions
- Basic caching for textures, shaders and buffer objects to reduce OGL calls
Image loading from file (automatic switch to right format)
- PNG (pnglib)
- Targa
Physics service
- AABB fast test
- Convex-convex polygon collision using SAT
- Circle-circle collision
- Circle-Convex polygon collision (SAT)
- Basic physics (linear velocity, linear acceleration, angular velocity and friction system)
Misc
- General purpose animation player (AnimationPlayer)
  - Forward, backward, loop
  - Interpolation between frames (usefull for MD2 model animation)
- Random number generation (int, double, flip coin)
- Various string functions (StringEx):
  - get extension (from path)
  - upper, lower, to upper, to lower
  - is printable, visible, control char, lower/upper case, alpha, digit, etc.
  - to int, bool, double
  - strip left, right, substr, slice
  - memswap
- Uncopyable class
Debug
- Console/logcat printing
- Screen printing
- Assert on OpenGL or EGL error

Android specific features:

Multi-touch input (event-based)
- Pinch to zoom and rotate
- Virtual joystick
Back key overwriting
OpenSLES sound service
- WAV/MP3/OGG loading and playback
- Basic SFX
- Controller wrappers (please note that not all are supported on all devices) for:
  - Play (Start/Pause/Resume)
  - Volume
  - Bass booster
  - Pitch
  - Stereo
  - Seek
  - Playback rate
- Group controllers (issue a regular controller action to multiple objects)
Google Ads

Windows and Linux features:

Window creation
Debug
- File logger in html format
Input
- Keyboard input
- Mouse input