71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
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//go:build gl
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// 图集植被染色（渲染.md §4.1）：
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// 原版材质包的草顶/树叶纹理是灰度图，绿色来自生物群系染色表
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// （textures/colormap/grass.png、foliage.png）。
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// MVP：取染色表中心色（平原绿）对图集内对应纹理乘色；按群系逐顶点着色后置。
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package main
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import (
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"image"
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"image/color"
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"image/draw"
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"image/png"
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"os"
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"mc/internal/assets"
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)
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// applyAtlasTint 给图集内带染色标记的纹理乘上染色表中心色。
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// 返回新图集图像（原地复制后修改）；染色表缺失的键保持原样。
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func applyAtlasTint(src image.Image, uv map[string]image.Rectangle, am *assets.Manager, tinted map[string][]string) image.Image {
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b := src.Bounds()
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dst := image.NewRGBA(image.Rect(0, 0, b.Dx(), b.Dy()))
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draw.Draw(dst, dst.Bounds(), src, b.Min, draw.Src)
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for tintName, keys := range tinted {
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tr, tg, tb, ok := colormapCenter(am, tintName)
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if !ok {
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continue
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}
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for _, key := range keys {
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rect, found := uv[key]
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if !found {
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continue
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}
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for y := rect.Min.Y; y < rect.Max.Y; y++ {
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for x := rect.Min.X; x < rect.Max.X; x++ {
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pr, pg, pb, pa := src.At(x, y).RGBA()
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dst.SetRGBA(x, y, color.RGBA{
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R: uint8(uint32(uint8(pr>>8)) * tr / 255),
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G: uint8(uint32(uint8(pg>>8)) * tg / 255),
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B: uint8(uint32(uint8(pb>>8)) * tb / 255),
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A: uint8(pa >> 8),
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})
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}
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}
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}
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}
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return dst
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}
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// colormapCenter 读取染色表中心像素（0–255）。
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func colormapCenter(am *assets.Manager, name string) (r, g, b uint32, ok bool) {
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p, found := am.ResolveTexture("colormap/" + name)
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if !found {
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return 0, 0, 0, false
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}
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f, err := os.Open(p)
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if err != nil {
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return 0, 0, 0, false
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}
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defer f.Close()
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img, err := png.Decode(f)
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if err != nil {
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return 0, 0, 0, false
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}
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cb := img.Bounds()
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r, g, b, _ = img.At(cb.Min.X+cb.Dx()/2, cb.Min.Y+cb.Dy()/2).RGBA()
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return r >> 8, g >> 8, b >> 8, true
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}
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