package main // import "fmt" import "math" import "image" import "image/color" import "git.tebibyte.media/sashakoshka/tomo" import "git.tebibyte.media/sashakoshka/tomo/input" import "git.tebibyte.media/sashakoshka/tomo/canvas" import "git.tebibyte.media/sashakoshka/tomo/artist" import "git.tebibyte.media/sashakoshka/tomo/artist/shapes" import "git.tebibyte.media/sashakoshka/tomo/default/config" type ControlState struct { WalkForward bool WalkBackward bool StrafeLeft bool StrafeRight bool LookLeft bool LookRight bool Sprint bool } type Raycaster struct { entity tomo.FocusableEntity config config.Wrapped Camera controlState ControlState world World textures Textures onControlStateChange func (ControlState) renderDistance int } func NewRaycaster (world World, textures Textures) (element *Raycaster) { element = &Raycaster { Camera: Camera { Vector: Vector { X: 1, Y: 1, }, Angle: math.Pi / 3, Fov: 1, }, world: world, textures: textures, renderDistance: 8, } element.entity = tomo.NewEntity(element).(tomo.FocusableEntity) element.entity.SetMinimumSize(64, 64) return } func (element *Raycaster) Entity () tomo.Entity { return element.entity } func (element *Raycaster) Draw (destination canvas.Canvas) { bounds := element.entity.Bounds() // artist.FillRectangle(element.core, artist.Uhex(0x000000FF), bounds) width := bounds.Dx() height := bounds.Dy() halfway := bounds.Max.Y - height / 2 ray := Ray { Angle: element.Camera.Angle - element.Camera.Fov / 2 } for x := 0; x < width; x ++ { ray.X = element.Camera.X ray.Y = element.Camera.Y distance, hitPoint, wall, horizontal := ray.Cast ( element.world, element.renderDistance) distance *= math.Cos(ray.Angle - element.Camera.Angle) textureX := math.Mod(hitPoint.X + hitPoint.Y, 1) if textureX < 0 { textureX += 1 } wallHeight := height if distance > 0 { wallHeight = int((float64(height) / 2.0) / float64(distance)) } shade := 1.0 if horizontal { shade *= 0.8 } shade *= 1 - distance / float64(element.renderDistance) if shade < 0 { shade = 0 } ceilingColor := color.RGBA { 0x00, 0x00, 0x00, 0xFF } floorColor := color.RGBA { 0x39, 0x49, 0x25, 0xFF } // draw data, stride := destination.Buffer() wallStart := halfway - wallHeight wallEnd := halfway + wallHeight for y := bounds.Min.Y; y < bounds.Max.Y; y ++ { switch { case y < wallStart: data[y * stride + x + bounds.Min.X] = ceilingColor case y < wallEnd: textureY := float64(y - halfway) / float64(wallEnd - wallStart) + 0.5 // fmt.Println(textureY) wallColor := element.textures.At (wall, Vector { textureX, textureY, }) wallColor = shadeColor(wallColor, shade) data[y * stride + x + bounds.Min.X] = wallColor default: data[y * stride + x + bounds.Min.X] = floorColor } } // increment angle ray.Angle += element.Camera.Fov / float64(width) } // element.drawMinimap() } func (element *Raycaster) Invalidate () { element.entity.Invalidate() } func (element *Raycaster) OnControlStateChange (callback func (ControlState)) { element.onControlStateChange = callback } func (element *Raycaster) Focus () { element.entity.Focus() } func (element *Raycaster) SetEnabled (bool) { } func (element *Raycaster) Enabled () bool { return true } func (element *Raycaster) HandleFocusChange () { } func (element *Raycaster) HandleMouseDown (x, y int, button input.Button) { element.entity.Focus() } func (element *Raycaster) HandleMouseUp (x, y int, button input.Button) { } func (element *Raycaster) HandleKeyDown (key input.Key, modifiers input.Modifiers) { switch key { case input.KeyLeft: element.controlState.LookLeft = true case input.KeyRight: element.controlState.LookRight = true case 'a', 'A': element.controlState.StrafeLeft = true case 'd', 'D': element.controlState.StrafeRight = true case 'w', 'W': element.controlState.WalkForward = true case 's', 'S': element.controlState.WalkBackward = true case input.KeyLeftControl: element.controlState.Sprint = true default: return } if element.onControlStateChange != nil { element.onControlStateChange(element.controlState) } } func (element *Raycaster) HandleKeyUp(key input.Key, modifiers input.Modifiers) { switch key { case input.KeyLeft: element.controlState.LookLeft = false case input.KeyRight: element.controlState.LookRight = false case 'a', 'A': element.controlState.StrafeLeft = false case 'd', 'D': element.controlState.StrafeRight = false case 'w', 'W': element.controlState.WalkForward = false case 's', 'S': element.controlState.WalkBackward = false case input.KeyLeftControl: element.controlState.Sprint = false default: return } if element.onControlStateChange != nil { element.onControlStateChange(element.controlState) } } func shadeColor (c color.RGBA, brightness float64) color.RGBA { return color.RGBA { uint8(float64(c.R) * brightness), uint8(float64(c.G) * brightness), uint8(float64(c.B) * brightness), c.A, } } func (element *Raycaster) drawMinimap (destination canvas.Canvas) { bounds := element.entity.Bounds() scale := 8 for y := 0; y < len(element.world.Data) / element.world.Stride; y ++ { for x := 0; x < element.world.Stride; x ++ { cellPt := image.Pt(x, y) cell := element.world.At(cellPt) cellBounds := image.Rectangle { cellPt.Mul(scale), cellPt.Add(image.Pt(1, 1)).Mul(scale), }.Add(bounds.Min) cellColor := color.RGBA { 0x22, 0x22, 0x22, 0xFF } if cell > 0 { cellColor = color.RGBA { 0xFF, 0xFF, 0xFF, 0xFF } } shapes.FillColorRectangle ( destination, cellColor, cellBounds.Inset(1)) }} playerPt := element.Camera.Mul(float64(scale)).Point().Add(bounds.Min) playerAnglePt := element.Camera.Add(element.Camera.Delta()). Mul(float64(scale)).Point().Add(bounds.Min) ray := Ray { Vector: element.Camera.Vector, Angle: element.Camera.Angle } _, hit, _, _ := ray.Cast(element.world, 8) hitPt := hit.Mul(float64(scale)).Point().Add(bounds.Min) playerBounds := image.Rectangle { playerPt, playerPt }.Inset(scale / -8) shapes.FillColorEllipse ( destination, artist.Hex(0xFFFFFFFF), playerBounds) shapes.ColorLine ( destination, artist.Hex(0xFFFFFFFF), 1, playerPt, playerAnglePt) shapes.ColorLine ( destination, artist.Hex(0x00FF00FF), 1, playerPt, hitPt) }