378 lines
10 KiB
JavaScript
378 lines
10 KiB
JavaScript
import { Mesh } from '../mesh'
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import { MeshInstance } from '../components'
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import { vec3 } from 'gl-matrix'
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import { addv3, subv3, dim3to1 } from '../utility'
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import VoxelData from './voxeldata'
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import VoxelTexture from './voxeltexture'
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const FACE_VERTEX = [
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// Bottom
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[
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[1.0, 0.0, 0.0],
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[1.0, 0.0, 1.0],
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[0.0, 0.0, 1.0],
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[0.0, 0.0, 0.0],
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[0.0, -1.0, 0.0]
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],
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// Top
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[
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[0.0, 1.0, 0.0],
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[0.0, 1.0, 1.0],
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[1.0, 1.0, 1.0],
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[1.0, 1.0, 0.0],
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[0.0, 1.0, 0.0]
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],
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// Left
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[
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[0.0, 1.0, 0.0],
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[0.0, 0.0, 0.0],
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[0.0, 0.0, 1.0],
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[0.0, 1.0, 1.0],
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[-1.0, 0.0, 0.0]
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],
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// Right
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[
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[1.0, 1.0, 1.0],
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[1.0, 0.0, 1.0],
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[1.0, 0.0, 0.0],
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[1.0, 1.0, 0.0],
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[1.0, 0.0, 0.0]
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],
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// Front
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[
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[0.0, 1.0, 1.0],
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[0.0, 0.0, 1.0],
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[1.0, 0.0, 1.0],
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[1.0, 1.0, 1.0],
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[0.0, 0.0, -1.0]
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],
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// Back
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[
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[1.0, 1.0, 0.0],
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[1.0, 0.0, 0.0],
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[0.0, 0.0, 0.0],
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[0.0, 1.0, 0.0],
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[0.0, 0.0, 1.0]
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]
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]
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const FACE_BOTTOM = 0
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const FACE_TOP = 1
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const FACE_LEFT = 2
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const FACE_RIGHT = 3
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const FACE_FRONT = 4
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const FACE_BACK = 5
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const AIR = VoxelData.register('air', { solid: false })
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const GRASS = VoxelData.register('grass', { solid: true, tiles: [0, 2, 1, 1, 1, 1] })
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const DIRT = VoxelData.register('dirt', { solid: true, tiles: [0] })
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const STONE = VoxelData.register('stone', { solid: true, tiles: [3] })
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class VoxelChunk extends MeshInstance {
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constructor (world, pos, size = 16) {
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super(null, [pos[0] * size, pos[1] * size, pos[2] * size])
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this.world = world
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this.relativePos = pos
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this.size = size
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this.mesh = null
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// Voxel data
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this.data = []
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// Set to true when this chunk mesh requires to be recreated
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this.dirty = true
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// Set to true when the generation has been finished
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this.generated = false
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// If the chunk is outside of the view, make it inactive
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this.active = true
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this.bounds = [
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vec3.transformMat4([], [0.0, 0.0, 0.0], this.transform),
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vec3.transformMat4([], [this.size, this.size, this.size], this.transform)
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]
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}
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getVoxel (x, y, z) {
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if (this.world) {
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let neighbor
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if (x < 0) {
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neighbor = this.world.getChunk(this.relativePos[0] - 1, this.relativePos[1], this.relativePos[2])
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if (neighbor) {
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return neighbor.getVoxel(this.size + x, y, z)
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}
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return AIR
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} else if (x >= this.size) {
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neighbor = this.world.getChunk(this.relativePos[0] + 1, this.relativePos[1], this.relativePos[2])
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if (neighbor) {
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return neighbor.getVoxel(x - this.size, y, z)
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}
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return AIR
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} else if (y < 0) {
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neighbor = this.world.getChunk(this.relativePos[0], this.relativePos[1] - 1, this.relativePos[2])
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if (neighbor) {
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return neighbor.getVoxel(x, this.size + y, z)
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}
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return AIR
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} else if (y >= this.size) {
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neighbor = this.world.getChunk(this.relativePos[0], this.relativePos[1] + 1, this.relativePos[2])
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if (neighbor) {
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return neighbor.getVoxel(x, y - this.size, z)
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}
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return AIR
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} else if (z < 0) {
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neighbor = this.world.getChunk(this.relativePos[0], this.relativePos[1], this.relativePos[2] - 1)
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if (neighbor) {
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return neighbor.getVoxel(x, y, this.size + z)
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}
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return AIR
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} else if (z >= this.size) {
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neighbor = this.world.getChunk(this.relativePos[0], this.relativePos[1], this.relativePos[2] + 1)
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if (neighbor) {
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return neighbor.getVoxel(x, y, z - this.size)
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}
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return AIR
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}
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}
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return this.data[dim3to1(x, y, z, this.size)] || AIR
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}
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getVoxelv (v) {
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return this.getVoxel(v[0], v[1], v[2])
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}
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generate (generator) {
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this.material = VoxelTexture.material
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for (let x = 0; x < this.size; x++) {
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for (let z = 0; z < this.size; z++) {
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const columnHeight = Math.floor(generator.getHeight(x + this.pos[0], z + this.pos[2]))
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for (let y = 0; y < this.size; y++) {
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let voxel = AIR
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if (this.pos[1] + y === columnHeight) voxel = GRASS
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else if (this.pos[1] + y < columnHeight - 3) voxel = STONE
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else if (this.pos[1] + y < columnHeight) voxel = DIRT
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this.data[dim3to1(x, y, z, this.size)] = voxel
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}
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}
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}
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this.generated = true
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return true
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}
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// Programmatically generate a voxel face
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// Returns the position, normal and texture coordinates for each vertex in this face
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createFace (indices, points, pos, vId, face) {
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// Add the corresponding offsets for this face to the position
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const corners = [
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addv3(pos, FACE_VERTEX[face][0]), addv3(pos, FACE_VERTEX[face][1]),
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addv3(pos, FACE_VERTEX[face][2]), addv3(pos, FACE_VERTEX[face][3])
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]
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// Select the normal for this face
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const normal = FACE_VERTEX[face][4]
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const uvs = VoxelData.textureIndex(vId, face)
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// Create the 4 vertices that make up this face
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// They're named points because this function returns not only vertices,
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// but corresponding texture coordinates and normals at the same time for convenience
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points.push([corners[0], normal, uvs[1]])
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points.push([corners[1], normal, uvs[0]])
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points.push([corners[2], normal, uvs[2]])
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points.push([corners[3], normal, uvs[3]])
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// Create the face
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const inx = points.length - 4
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indices.push(inx)
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indices.push(inx + 1)
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indices.push(inx + 2)
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indices.push(inx)
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indices.push(inx + 2)
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indices.push(inx + 3)
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}
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createMesh (gl) {
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// Makes sure the createMesh function is not called again while it is generating
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this.dirty = false
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// If there is no generated chunk, we have nothing to base a mesh off of
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if (!this.generated) return false
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// If there already exists a mesh, dispose of it
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if (this.mesh) {
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this.mesh.dispose(gl)
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}
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// Array of vertices with texture positions and normals
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const points = []
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const indices = []
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// Generate face quads for each voxel in the chunk
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for (let x = 0; x < this.size; x++) {
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for (let y = 0; y < this.size; y++) {
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for (let z = 0; z < this.size; z++) {
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const cellPos = [x, y, z]
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const vid = this.getVoxel(x, y, z)
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if (!VoxelData.isSolid(vid)) continue
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if (!VoxelData.isSolid(this.getVoxel(x, y - 1, z))) {
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this.createFace(indices, points, cellPos, vid, FACE_BOTTOM)
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}
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if (!VoxelData.isSolid(this.getVoxel(x, y + 1, z))) {
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this.createFace(indices, points, cellPos, vid, FACE_TOP)
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}
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if (!VoxelData.isSolid(this.getVoxel(x - 1, y, z))) {
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this.createFace(indices, points, cellPos, vid, FACE_LEFT)
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}
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if (!VoxelData.isSolid(this.getVoxel(x + 1, y, z))) {
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this.createFace(indices, points, cellPos, vid, FACE_RIGHT)
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}
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if (!VoxelData.isSolid(this.getVoxel(x, y, z + 1))) {
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this.createFace(indices, points, cellPos, vid, FACE_FRONT)
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}
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if (!VoxelData.isSolid(this.getVoxel(x, y, z - 1))) {
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this.createFace(indices, points, cellPos, vid, FACE_BACK)
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}
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}
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}
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}
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// Do not create a mesh when there are no faces in this chunk
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if (points.length === 0) {
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return false
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}
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// Flatten the points array to three separate arrays
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const vertices = []
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const normals = []
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const uvs = []
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for (const i in points) {
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const vert = points[i]
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vertices.push(vert[0][0])
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vertices.push(vert[0][1])
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vertices.push(vert[0][2])
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normals.push(vert[1][0])
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normals.push(vert[1][1])
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normals.push(vert[1][2])
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uvs.push(vert[2][0])
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uvs.push(vert[2][1])
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}
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// Create a new mesh with an element array buffer
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this.mesh = Mesh.construct(gl, vertices, indices, uvs, normals)
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if (this.material) this.mesh.material = this.material
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return true
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}
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update (gl, dt, camera) {
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if (this.bounds.length) this.active = camera.frustum.containsBox(this.bounds[0], this.bounds[1])
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if (!this.active) return false
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if (!this.generated) return this.generate(this.world.generator)
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if (this.dirty) return this.createMesh(gl)
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return false
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}
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destroy (gl) {
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this.generated = false
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this.mesh && this.mesh.dispose(gl)
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this.data = {}
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}
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draw (gl, shader, camera) {
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if (this.active) super.draw(gl, shader)
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}
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}
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class VoxelWorld {
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constructor (generator, origin, chunkSize = 16, renderDistance = 5) {
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this.generator = generator
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this.origin = origin
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this.chunkSize = chunkSize
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this.renderDistance = renderDistance
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this.chunks = []
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}
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getChunk (x, y, z) {
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for (const i in this.chunks) {
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const c = this.chunks[i]
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if (c.relativePos[0] === x && c.relativePos[1] === y && c.relativePos[2] === z) return c
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}
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return null
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}
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getChunkv (v) {
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return this.getChunk(v[0], v[1], v[2])
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}
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destroy (gl) {
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for (const i in this.chunks) {
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const ch = this.chunks[i]
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if (!(ch instanceof VoxelChunk)) continue
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ch.destroy(gl)
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}
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this.chunks = []
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}
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update (gl, dt, camera) {
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const slgrid = [
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Math.floor(camera.pos[0] / this.chunkSize),
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Math.floor(camera.pos[1] / this.chunkSize),
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Math.floor(camera.pos[2] / this.chunkSize)
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]
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for (let x = slgrid[0] - this.renderDistance; x < slgrid[0] + this.renderDistance; x++) {
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for (let z = slgrid[2] - this.renderDistance; z < slgrid[2] + this.renderDistance; z++) {
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for (let y = slgrid[1] + this.renderDistance / 2; y > slgrid[1] - this.renderDistance / 2; y--) {
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if (this.getChunk(x, y, z)) continue
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const chunk = new VoxelChunk(this, [x, y, z], this.chunkSize)
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this.chunks.push(chunk)
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}
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}
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}
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const resp = []
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for (const i in this.chunks) {
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const chunk = this.chunks[i]
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const dist = vec3.length(subv3(chunk.relativePos, slgrid))
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if (dist < this.renderDistance) resp.push(chunk)
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}
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this.chunks = resp
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for (const i in this.chunks) {
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const ch = this.chunks[i]
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if (ch.update(gl, dt, camera)) break
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}
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}
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draw (gl, shader) {
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for (const i in this.chunks) {
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this.chunks[i].draw(gl, shader)
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}
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}
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}
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class VoxelGenerator {
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constructor (noise, groundHeight = 64) {
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this.noise = noise
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this.groundHeight = groundHeight
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}
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// Get chunk height
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getHeight (x, z) {
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return this.noise.getHeight(x / 100, z / 100) * this.noise.amplitude + this.groundHeight
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}
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}
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export { VoxelGenerator, VoxelChunk, VoxelWorld }
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