89 lines
2.5 KiB
Go
89 lines
2.5 KiB
Go
//go:build gl
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// 光影包加载：type=shader 内容包替换着色器（渲染.md §9.2–§9.3）。
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package render
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import (
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"fmt"
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"os"
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"path/filepath"
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"mc/internal/assets"
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"github.com/go-gl/gl/v3.3-core/gl"
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)
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// ShaderPack 一个光影包（着色器源码集合）。
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type ShaderPack struct {
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ID string
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Vert string // chunk.vert 源码
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Frag string // chunk.frag 源码
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}
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// LoadShaderPack 扫描内容包管理器，寻找 type=shader 的包并读取着色器。
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// 未安装光影包返回 (nil, nil) → 使用系统默认光影（渲染.md §9.1 默认回退）。
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func LoadShaderPack(am *assets.Manager) (*ShaderPack, error) {
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var pack *assets.Pack
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for _, p := range am.Packs() {
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if p.Type == assets.PackShader {
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pack = p
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break // 优先级已排序，第一个即最高优先级
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}
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}
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if pack == nil {
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return nil, nil // 默认光影
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}
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sp := &ShaderPack{ID: pack.ID}
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for _, ns := range []string{"minecraft", pack.ID} {
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vertPath := filepath.Join(pack.Root, "assets", ns, "shaders", "chunk.vert")
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if b, err := os.ReadFile(vertPath); err == nil {
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sp.Vert = string(b)
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break
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}
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}
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for _, ns := range []string{"minecraft", pack.ID} {
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fragPath := filepath.Join(pack.Root, "assets", ns, "shaders", "chunk.frag")
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if b, err := os.ReadFile(fragPath); err == nil {
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sp.Frag = string(b)
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break
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}
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}
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if sp.Vert == "" || sp.Frag == "" {
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return nil, fmt.Errorf("render.LoadShaderPack: 光影包 %q 缺少 chunk.vert/chunk.frag（拒绝加载，回退默认）", pack.ID)
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}
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return sp, nil
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}
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// ApplyShaderPack 用光影包重建着色程序（失败回退默认并返回错误，渲染.md §9.3）。
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func (r *Renderer) ApplyShaderPack(sp *ShaderPack) error {
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vertSrc, fragSrc := chunkVertSrc, chunkFragSrc
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if sp != nil {
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vertSrc, fragSrc = sp.Vert, sp.Frag
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}
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vs, err := compileShader(gl.VERTEX_SHADER, vertSrc)
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if err != nil {
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return fmt.Errorf("render.ApplyShaderPack 顶点着色器: %w", err)
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}
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defer gl.DeleteShader(vs)
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fs, err := compileShader(gl.FRAGMENT_SHADER, fragSrc)
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if err != nil {
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return fmt.Errorf("render.ApplyShaderPack 片元着色器: %w", err)
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}
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defer gl.DeleteShader(fs)
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prog := gl.CreateProgram()
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gl.AttachShader(prog, vs)
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gl.AttachShader(prog, fs)
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gl.LinkProgram(prog)
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var ok int32
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gl.GetProgramiv(prog, gl.LINK_STATUS, &ok)
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if ok == 0 {
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gl.DeleteProgram(prog)
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return fmt.Errorf("render.ApplyShaderPack: 链接失败（保留默认光影）")
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}
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if r.prog != 0 {
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gl.DeleteProgram(r.prog)
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}
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r.prog = prog
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return nil
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}
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