# Backlog

## Patch

> v1.1.2 - critical bug fixes

- [ ] Fix missing closing parenthesis in `FBGL_F32RGBA_TO_U32` macro — currently fails to compile `bug`
- [ ] Fix `fbgl_draw_line` termination condition — breaks for lines with negative direction (right-to-left or bottom-to-top) `bug`
- [ ] Fix `i_fbgl_sqrt_int` — currently computes x\*x (square) not sqrt, corrupting filled circle rendering `bug`
- [ ] Implement missing `fbgl_clear` — declared in header but has no definition; rename or alias from `fbgl_set_bg` `bug`

## Minor

> v1.2.0 - input and window system

- [ ] Fix `fbgl_is_key_pressed` consuming the keypress via `fbgl_get_key` — peek without consuming `bug`
- [ ] Add mouse input support — position, left/right/middle button state `feat`
- [ ] Implement `fbgl_window_t` API — `fbgl_window_create`, `fbgl_window_destroy`, clipped drawing within window bounds `feat`
- [ ] Add line thickness parameter to `fbgl_draw_line` `feat`
- [ ] Add `fbgl_draw_triangle_outline` and `fbgl_draw_triangle_filled` `feat`
- [ ] Add `fbgl_draw_ellipse_outline` and `fbgl_draw_ellipse_filled` `feat`
- [ ] Add `fbgl_draw_arc` primitive `feat`

## Minor

> v1.3.0 - rendering quality

- [ ] Add double buffering — off-screen back buffer with explicit `fbgl_swap_buffers` to eliminate tearing `feat`
- [ ] Add alpha blending / compositing — partial transparency instead of binary draw-or-skip `feat`
- [ ] Add clipping region / scissor rect support `feat`
- [ ] Add scaled texture rendering — `fbgl_draw_texture_scaled(fb, tex, x, y, w, h)` `feat`
- [ ] Add PSF2 font support alongside existing PSF1 `feat`
- [ ] Add polygon drawing — `fbgl_draw_polygon_outline` and `fbgl_draw_polygon_filled` with vertex array `feat`

## Minor

> v1.4.0 - performance & dx

- [ ] Add thread safety — mutex guards on `g_keyboard_state` and `previous_frame_time` globals `dx`
- [ ] Batch pixel writes with `memset` / SIMD where applicable for `fbgl_set_bg` and filled shapes `perf`
- [ ] Add dirty-rect tracking — only flush changed regions to framebuffer `perf`
- [ ] Add `FBGL_NO_MATH` compile flag to explicitly opt out of `math.h` dependency `dx`
- [ ] Add comprehensive error code enum — replace magic `-1` returns with named codes `dx`
- [ ] Add debug logging mode with `FBGL_DEBUG` flag covering all drawing functions, not just `fbgl_set_bg` `dx`

## Major

> v2.0.0 - multi-display & extended formats

- [ ] Multi-display support — manage multiple `/dev/fbN` devices simultaneously `feat`
- [ ] PNG texture loader alongside existing TGA — reduces external tooling dependency `feat`
- [ ] Sprite sheet / atlas support with UV rect selection `feat`
- [ ] TTF/BDF font rasterizer — remove hard dependency on PSF bitmap fonts `feat`
- [ ] Break `fbgl_window_t` into full sub-surface compositor with z-ordering `feat`