119 lines
2.9 KiB
Go
119 lines
2.9 KiB
Go
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package cube
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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/material"
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"zworld/engine/renderapi/texture"
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"zworld/engine/renderapi/vertex"
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"zworld/plugins/math/vec2"
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"zworld/plugins/math/vec3"
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)
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type Object struct {
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object.Object
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*Mesh
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}
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func NewObject(args Args) *Object {
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return object.New("Cube", &Object{
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Mesh: New(args),
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})
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}
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// Mesh is a vertex colored cube mesh
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type Mesh struct {
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*mesh.Static
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Args
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}
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type Args struct {
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Mat *material.Def
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Size float32
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}
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// New creates a vertex colored cube mesh with a given size
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func New(args Args) *Mesh {
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if args.Mat == nil {
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args.Mat = material.ColoredForward()
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}
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cube := object.NewComponent(&Mesh{
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Static: mesh.New(args.Mat),
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Args: args,
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})
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cube.SetTexture(texture.Diffuse, texture.Checker)
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cube.generate()
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return cube
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}
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func (c *Mesh) generate() {
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s := c.Size / 2
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topLeft := vec2.New(0, 0)
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topRight := vec2.New(1, 0)
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bottomLeft := vec2.New(0, 1)
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bottomRight := vec2.New(1, 1)
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vertices := []vertex.T{
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// X+
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{P: vec3.New(s, -s, s), N: vec3.UnitX, T: bottomRight}, // 0
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{P: vec3.New(s, -s, -s), N: vec3.UnitX, T: bottomLeft}, // 1
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{P: vec3.New(s, s, -s), N: vec3.UnitX, T: topLeft}, // 2
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{P: vec3.New(s, s, s), N: vec3.UnitX, T: topRight}, // 3
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// X-
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{P: vec3.New(-s, -s, -s), N: vec3.UnitXN, T: bottomRight}, // 4
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{P: vec3.New(-s, -s, s), N: vec3.UnitXN, T: bottomLeft}, // 5
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{P: vec3.New(-s, s, s), N: vec3.UnitXN, T: topLeft}, // 6
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{P: vec3.New(-s, s, -s), N: vec3.UnitXN, T: topRight}, // 7
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// Y+
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{P: vec3.New(s, s, -s), N: vec3.UnitY, T: bottomRight}, // 8
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{P: vec3.New(-s, s, -s), N: vec3.UnitY, T: bottomLeft}, // 9
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{P: vec3.New(-s, s, s), N: vec3.UnitY, T: topLeft}, // 10
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{P: vec3.New(s, s, s), N: vec3.UnitY, T: topRight}, // 11
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// Y-
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{P: vec3.New(-s, -s, -s), N: vec3.UnitYN, T: bottomRight}, // 12
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{P: vec3.New(s, -s, -s), N: vec3.UnitYN, T: bottomLeft}, // 13
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{P: vec3.New(s, -s, s), N: vec3.UnitYN, T: topLeft}, // 14
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{P: vec3.New(-s, -s, s), N: vec3.UnitYN, T: topRight}, // 15
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// Z+
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{P: vec3.New(-s, -s, s), N: vec3.UnitZ, T: bottomRight}, // 16
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{P: vec3.New(s, -s, s), N: vec3.UnitZ, T: bottomLeft}, // 17
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{P: vec3.New(s, s, s), N: vec3.UnitZ, T: topLeft}, // 18
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{P: vec3.New(-s, s, s), N: vec3.UnitZ, T: topRight}, // 19
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// Z-
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{P: vec3.New(s, -s, -s), N: vec3.UnitZN, T: bottomRight}, // 20
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{P: vec3.New(-s, -s, -s), N: vec3.UnitZN, T: bottomLeft}, // 21
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{P: vec3.New(-s, s, -s), N: vec3.UnitZN, T: topLeft}, // 22
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{P: vec3.New(s, s, -s), N: vec3.UnitZN, T: topRight}, // 23
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}
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indices := []uint16{
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0, 1, 2,
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0, 2, 3,
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4, 5, 6,
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4, 6, 7,
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8, 9, 10,
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8, 10, 11,
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12, 13, 14,
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12, 14, 15,
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16, 17, 18,
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16, 18, 19,
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20, 21, 22,
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20, 22, 23,
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}
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key := object.Key("cube", c)
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mesh := vertex.NewTriangles(key, vertices, indices)
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c.VertexData.Set(mesh)
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}
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