92 lines
1.7 KiB
Go
92 lines
1.7 KiB
Go
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package lines
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import (
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"zworld/engine/object"
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"zworld/engine/object/mesh"
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"zworld/engine/renderapi/color"
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"zworld/engine/renderapi/vertex"
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"zworld/plugins/math/vec3"
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)
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type BoxObject struct {
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object.Object
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*Box
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}
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func NewBoxObject(args BoxArgs) *BoxObject {
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return object.New("Box", &BoxObject{
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Box: NewBox(args),
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})
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}
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type Box struct {
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*mesh.Static
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Extents object.Property[vec3.T]
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Color object.Property[color.T]
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data vertex.MutableMesh[vertex.C, uint16]
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}
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// Args are kinda like props
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// If they change, we should recomupte the mesh
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type BoxArgs struct {
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Extents vec3.T
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Color color.T
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}
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func NewBox(args BoxArgs) *Box {
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b := object.NewComponent(&Box{
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Static: mesh.NewLines(),
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Extents: object.NewProperty(args.Extents),
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Color: object.NewProperty(args.Color),
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})
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b.data = vertex.NewLines[vertex.C, uint16](object.Key("box", b), nil, nil)
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b.Extents.OnChange.Subscribe(func(vec3.T) { b.refresh() })
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b.Color.OnChange.Subscribe(func(color.T) { b.refresh() })
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b.refresh()
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return b
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}
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func (b *Box) refresh() {
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halfsize := b.Extents.Get().Scaled(0.5)
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w, h, d := halfsize.X, halfsize.Y, halfsize.Z
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c := b.Color.Get().Vec4()
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vertices := []vertex.C{
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// bottom square
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{P: vec3.New(-w, -h, -d), C: c}, // 0
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{P: vec3.New(+w, -h, -d), C: c}, // 1
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{P: vec3.New(-w, -h, +d), C: c}, // 2
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{P: vec3.New(+w, -h, +d), C: c}, // 3
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// top square
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{P: vec3.New(-w, +h, -d), C: c}, // 4
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{P: vec3.New(+w, +h, -d), C: c}, // 5
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{P: vec3.New(-w, +h, +d), C: c}, // 6
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{P: vec3.New(+w, +h, +d), C: c}, // 7
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}
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indices := []uint16{
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// bottom
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0, 1,
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0, 2,
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1, 3,
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2, 3,
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// top
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4, 5,
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4, 6,
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5, 7,
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6, 7,
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// sides
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0, 4,
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1, 5,
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2, 6,
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3, 7,
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}
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b.data.Update(vertices, indices)
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b.VertexData.Set(b.data)
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}
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