`hs-quake-3`

Hello, welcome to the hs-quake-3 repository! This project re-implements various parts of the Quake 3 game in Haskell.

Features currently supported:

Most shader operations work. Most texture modulation functions work, multiple passes with blending, alpha testing and sorting are implemented.
BSP file parsing, and use of the PVS data to perform occlusion culling.

To give you an overview of the project:

Quake3.Shader.Parser is responsible for parsing Quake 3 shader files into an AST.
Quake3.Shader.TypeCheck "type checks" the result of parsing. At this stage, we register known shader opcodes and their parameters, and type check into a considerably richer data structure.
Quake3.Shader.GL takes the result of type-checking, and can transform shaders into a graph of OpenGL calls. This graph is described by RenderGraph.
RenderGraph allows one to describe a rendering pipe-line out of smaller components. The idea behind the render graph is to collect and sort common operations - state changes in OpenGL are expensive, so we want to avoid them wherever possible. RenderGraph currently contains nodes necessary for rendering (most of) Quake 3 - nodes to bind texture stages, set shader parameters, enable multiple passes, and so.

This module is independent of Quake 3, and may well be usable in other projects.
GLObjects is a light wrapper around objects offered by OpenGL. Here we have what are essentially newtype wrappers around textures, vertex array objects, and helper functions to create/upload data.
Wires.* contains the logic of the game. Wires.Game is responsible for taking the camera position, determining which clusters are visible to deliver a final render. Wires.Camera implements a rudimentary first-person camera, interpreting SDL keyboard and mouse events as matrix transformations.
UI/Main forms the initialization process.