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