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generator.go
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generator.go
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// Copyright (c) 2017 Marcus Brummer.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License iss distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package vox
import "math/rand"
type Generator interface {
GenerateChunkAt(x, y, z int, bank *BlockBank) *Chunk
}
type FlatGenerator struct {
}
func (g *FlatGenerator) GenerateChunkAt(x, y, z int, bank *BlockBank) *Chunk {
c := NewChunk(x, y, z)
typeIdx := 0
for i := 0; i < ChunkXYZ; i++ {
c.Blocks[i] = c.Blocks[i].Activate(true)
// block type
if typeIdx >= len(bank.Types) {
typeIdx = 0
}
c.Blocks[i] = c.Blocks[i].ChangeType(bank.Types[typeIdx])
typeIdx++
}
return c
}
type SimplexGenerator struct {
seed int64
noise *SimplexNoise
}
func NewSimplexGenerator(seed int64) Generator {
return &SimplexGenerator{
seed: seed,
noise: NewSimplex(seed),
}
}
func (g *SimplexGenerator) GenerateChunkAt(xx, yy, zz int, bank *BlockBank) *Chunk {
c := NewChunk(xx, yy, zz)
t := uint8(1 + rand.Int()%3)
worldX := float64(xx)
worldZ := float64(zz)
scaleX := 1.0 / float64(ChunkWidth)
scaleZ := 1.0 / float64(ChunkDepth)
typeIdx := 0
for z := 0; z < ChunkDepth; z++ {
for x := 0; x < ChunkWidth; x++ {
simplex := g.noise.Simplex2(worldX+float64(x)*scaleX, worldZ+float64(z)*scaleZ, 3, 0.5, 2)
height := int(simplex * ChunkHeight)
for y := 0; y < ChunkHeight; y++ {
i := c.IndexAt(x, y, z)
c.Blocks[i] = c.Blocks[i].Activate(y < height)
// block type
if typeIdx >= len(bank.Types) {
typeIdx = 0
}
c.Blocks[i] = c.Blocks[i].ChangeType(bank.typeMap[t])
typeIdx++
}
}
}
return c
}