# Cartograph

A browser-based world map creation tool inspired by Wonderdraft and Inkarnate. Uses shape-based terrain generation with procedural detail.

## Features (planned)

- **Shapes** — the fundamental building block. Each shape has:
  - **Height** — additive (raise terrain) or subtractive (lower terrain)
  - **Biome** — determines the sampled texture applied to the shape
  - **Intensity** — blending weight of the biome texture
  - **Roughness** — edge noise amount (voronoi-like jagged edges at maximum)
- **Shape editing** — select, move, rotate, scale individual shapes
- **Groups** — combine shapes into groups for batch operations
- **Shake landmass** — procedurally decompose a shape into a more complex set of shapes
- **Viewport** — zoom and pan across the map canvas

## Tech stack

| Layer | Library |
|---|---|
| Language | C (C99) |
| Compiler | [Emscripten](https://emscripten.org/) (emcc) → WebAssembly |
| Graphics | [Sokol](https://github.com/floooh/sokol) with WebGPU backend |
| UI | [Dear ImGui](https://github.com/ocornut/imgui) via [cimgui](https://github.com/cimgui/cimgui) |
| Math | [cglm](https://github.com/recp/cglm) |
| Shaders | WGSL (compiled to C headers via `xxd`) |

## Build

```sh
# Install dependencies
./fetch_libs.sh

# Release build
make

# Debug build
make debug
```

Output is `app.html`, served by Emscripten's built-in web server or any static server.

## Project structure

```
src/
  main.c          Entry point, sokol init, render loop, input handling
  api.h           Central include — all library headers and project-wide defines
  sprite.h        Sprite batching, texture management, file import
  util.h          Vector (dynamic array) and memory pool data structures
  rand.h          Xorshift32 PRNG utilities
  shaders/        WGSL shader sources
  generated/      xxd-generated C headers from shaders
lib/
  sokol/          Sokol single-file headers (gfx, app, glue, log)
  imgui/          Dear ImGui + cimgui
  cglm/           C linear math library
  util/           Sokol utility headers (memtrack, imgui integration)
```

## License

MIT