60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
package atlas
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import (
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"github.com/mdiluz/rove/pkg/maths"
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"github.com/mdiluz/rove/proto/roveapi"
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"github.com/ojrac/opensimplex-go"
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)
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// WorldGen describes a world gen algorythm
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type WorldGen interface {
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// GetTile generates a tile for a location
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GetTile(v maths.Vector) roveapi.Tile
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// GetObject generates an object for a location
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GetObject(v maths.Vector) Object
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}
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// NoiseWorldGen returns a noise based world generator
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type NoiseWorldGen struct {
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// noise describes the noise function
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noise opensimplex.Noise
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}
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// NewNoiseWorldGen creates a new noise based world generator
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func NewNoiseWorldGen(seed int64) WorldGen {
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return &NoiseWorldGen{
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noise: opensimplex.New(seed),
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}
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}
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const (
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terrainNoiseScale = 6
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objectNoiseScale = 3
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)
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// GetTile returns the chosen tile at a location
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func (g *NoiseWorldGen) GetTile(v maths.Vector) roveapi.Tile {
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t := g.noise.Eval2(float64(v.X)/terrainNoiseScale, float64(v.Y)/terrainNoiseScale)
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switch {
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case t > 0.5:
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return roveapi.Tile_Gravel
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case t > 0.05:
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return roveapi.Tile_Sand
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default:
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return roveapi.Tile_Rock
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}
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}
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// GetObject returns the chosen object at a location
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func (g *NoiseWorldGen) GetObject(v maths.Vector) Object {
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o := g.noise.Eval2(float64(v.X)/objectNoiseScale, float64(v.Y)/objectNoiseScale)
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var obj = roveapi.Object_ObjectUnknown
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switch {
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case o > 0.6:
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obj = roveapi.Object_RockLarge
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case o > 0.5:
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obj = roveapi.Object_RockSmall
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}
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return Object{Type: roveapi.Object(obj)}
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}
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