Initial commit

main.go

@@ -0,0 +1,97 @@
+package main
+
+import (
+	"log"
+	stdmath "math"
+	"time"
+
+	"github.com/pnx/go-raytracer/graphics"
+	"github.com/pnx/go-raytracer/math"
+	"github.com/pnx/go-raytracer/render"
+	"github.com/pnx/go-raytracer/world"
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+var (
+	gfxContext   *graphics.Context
+	player       Player
+	level        *world.Level
+	startOfFrame time.Time
+)
+
+func loadLevel(newLevel *world.Level) {
+	level = newLevel
+
+	// Set player start position
+	start := level.PlayerStart()
+
+	player.Position = math.Position{
+		X: (float64(start.X) + 0.5) * tileSize,
+		Y: (float64(start.Y) + 0.5) * tileSize,
+	}
+}
+
+func update() bool {
+	for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
+		switch ev := event.(type) {
+		case *sdl.QuitEvent:
+			return true
+		case *sdl.KeyboardEvent:
+			if ev.Type == sdl.KEYDOWN {
+				switch ev.Keysym.Sym {
+				case sdl.K_ESCAPE:
+					return true
+				}
+			}
+		}
+	}
+
+	keys := sdl.GetKeyboardState()
+
+	if keys[sdl.SCANCODE_UP] != 0 {
+		player.MoveForward(level)
+	}
+	if keys[sdl.SCANCODE_DOWN] != 0 {
+		player.MoveBackward(level)
+	}
+	if keys[sdl.SCANCODE_LEFT] != 0 {
+		player.RotateLeft()
+	}
+	if keys[sdl.SCANCODE_RIGHT] != 0 {
+		player.RotateRight()
+	}
+
+	return false
+}
+
+func main() {
+	var err error
+
+	gfxContext, err = graphics.Init("Go Raycaster", 1024, 768)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	player = Player{
+		MoveSpd: 2,
+		RotSpd:  0.05,
+	}
+
+	loadLevel(&world.Level1)
+
+	for {
+		startOfFrame := time.Now()
+		if update() {
+			break
+		}
+
+		render.DrawScene(gfxContext, player.Transform, level, colorMap)
+		render.DrawMiniMap(gfxContext, player.Transform, level)
+		gfxContext.Sync()
+
+		elapsed := time.Since(startOfFrame)
+		sdl.Delay(uint32(stdmath.Max(16-float64(elapsed.Milliseconds()), 1)))
+	}
+
+	gfxContext.Exit()
+}