93 lines
1.6 KiB
Go
93 lines
1.6 KiB
Go
package main
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import (
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"fmt"
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rl "github.com/gen2brain/raylib-go/raylib"
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"github.com/ojrac/opensimplex-go"
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)
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type Field interface {
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/**
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* return a value on the range 0,1
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*/
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Get(x float32, y float32) float32
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}
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// TRANSFORM FIELDS
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type ScaleField struct {
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field Field
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scale float32
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}
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func (f *ScaleField) Get(x, y float32) float32 {
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return f.field.Get(x/f.scale, y/f.scale)
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}
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type TranslateField struct {
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field Field
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x, y float32
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}
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func (f *TranslateField) Get(x, y float32) float32 {
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return f.field.Get(x+f.x, y+f.y)
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}
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// NOISE FIELDS
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type SimplexNoiseField struct {
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Noise opensimplex.Noise32
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}
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func (f *SimplexNoiseField) Get(x, y float32) float32 {
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return f.Noise.Eval2(x, y)
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}
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// IMAGE FIELDS
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type ImageField struct {
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image *rl.Image
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pixels ImagePixels
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offsetX, offsetY int
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}
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type ImagePixels struct {
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w, h int
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colors []rl.Color
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}
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func (p *ImagePixels) Get(x, y int) rl.Color {
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if x < 0 || x >= p.w {
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return rl.Black
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}
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if y < 0 || y >= p.h {
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return rl.Black
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}
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return p.colors[x+y*p.w]
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}
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func NewImageField(path string) ImageField {
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image := rl.LoadImage(path)
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fmt.Printf("loaded image from %s\n", path)
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colors := rl.LoadImageColors(image)
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pixels := ImagePixels{
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w: int(image.Width),
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h: int(image.Height),
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colors: colors,
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}
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offsetX := int(image.Width)/2
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offsetY := int(image.Height)/2
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return ImageField{
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image: image,
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pixels: pixels,
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offsetX: offsetX,
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offsetY: offsetY,
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}
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}
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// zero centered
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func (f *ImageField) Get(x, y float32) float32 {
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// todo : blend colors
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c := f.pixels.Get(int(x+float32(f.offsetX)), int(y+float32(f.offsetY)))
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return Brightness(c)
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}
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