current-task

MEDIUM TASKS:
  - add HUD support to engine
  - implement level collision

TASK:
  - make engine api more general
    - support rendrering to multiple viewports
        Q: should it be a proper render tartget or just a specific area of the screen?
    - support 2D quads with shaders (2D screen space)
    - support dynamic lights (in the scene)

QUESTION:
  Context: Quake 3 Engine implemented graphics features in the game client code e.g.
    - font rendering
    - particle system
  How should the Haskell engine API look like?
    (A): Mimic the Q3 Engine API and support:
          - add polys to scene
          - stretch pic primitive
    (B): Builtin support, high level API
  Preference: (B)
  Decision:
    - support for emitting 2D quads (a.k.a trap_R_DrawStretchPic)
        use case:
          - text rendering
          - menu rendering
          - icons
    - native support for particles (must be efficient)

render active weapon
render status bar
  ammo count
  health count
  armor count (optional)
  frag limit / frag count

PROBLEM:
  convenient transformation between world space and screen space

TODO:
  UI layer in scene
    text
    models

general:
  done - protea audio
    parameter types and names; add description
    include example code in the main hackage page
    add ByteString loader also

  quake
    check how the weapon is draw in the original game

HUD SUPPORT
  text, icon, md3

  TODO
    check the API in the q3 source
    cg_newdraw.c
      CG_DrawPic( rect->x, rect->y + rect->h/2 + 1, rect->w, rect->h, cgs.media.armorIcon );
        trap:
          trap_R_DrawStretchPic
        command:
          void RE_StretchPic ( float x, float y, float w, float h, float s1, float t1, float s2, float t2, qhandle_t hShader )
        implementation:
          RB_StretchPic

      CG_Draw3DModel( rect->x, rect->y, rect->w, rect->h, cgs.media.armorModel, 0, origin, angles );

      void CG_DrawField (int x, int y, int width, int value)

    introduce a 2D layer in the engine with settings from RB_SetGL2D

    top level code
      CG_DrawStatusBar

    need for an absolute coordinate system, q3 uses 640x480 virtual screen size