Main.hs

{-# OPTIONS -Wall #-}
module Main where

import Control.Monad (unless)
import Raylib.Colors (black, white)
import Raylib.Core
  ( beginDrawing,
    beginMode3D,
    clearBackground,
    closeWindow,
    endDrawing,
    endMode3D,
    initWindow,
    setTargetFPS,
    updateCamera,
    windowShouldClose, disableCursor
  )
import Raylib.Models (drawCircle3D, drawCubeWiresV, drawLine3D)
import Raylib.Text (drawFPS)
import Raylib.Types (Camera3D (Camera3D), CameraMode (CameraModeFirstPerson), CameraProjection (CameraPerspective), Vector3 (Vector3))

main :: IO ()
main = do
  initWindow 600 450 "raylib [core] example - first person camera"
  setTargetFPS 60
  disableCursor

  let camera = Camera3D (Vector3 0 0 0) (Vector3 2 0 1) (Vector3 0 1 0) 70 CameraPerspective

  gameLoop camera

  closeWindow

gameLoop :: Camera3D -> IO ()
gameLoop camera = do
  beginDrawing

  clearBackground black
  drawFPS 10 20

  beginMode3D camera

  drawCircle3D (Vector3 2 0 1) 2 (Vector3 0 0 0) 0 white
  drawLine3D (Vector3 3 (-1) 1) (Vector3 1 1 1) white
  drawLine3D (Vector3 4 2 2) (Vector3 1 (-1) 1) white
  drawCubeWiresV (Vector3 (-2) 0 0) (Vector3 1 1 1) white

  endMode3D

  endDrawing
  newCam <- updateCamera camera CameraModeFirstPerson
  shouldClose <- windowShouldClose
  unless shouldClose $ gameLoop newCam