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https://github.com/hajimehoshi/ebiten.git
synced 2024-12-24 02:38:53 +01:00
shader: Enable more Go syntax
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parent
b64dc627e9
commit
f39c591252
@ -29,6 +29,8 @@ const (
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const shaderSrc = `package main
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var Time float
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// viewportSize is a predefined function.
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func Vertex(position vec2, texCoord vec2, color vec4) vec4 {
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@ -41,14 +43,22 @@ func Vertex(position vec2, texCoord vec2, color vec4) vec4 {
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}
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func Fragment(position vec4) vec4 {
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return vec4(position.x/viewportSize().x, position.y/viewportSize().y, 0, 1)
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pos := position.xy / viewportSize()
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color := 0.0
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color += sin(pos.x * cos(Time / 15.0) * 80.0) + cos(pos.y * cos(Time / 15.0) * 10.0)
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color += sin(pos.y * sin(Time / 10.0) * 40.0) + cos(pos.x * sin(Time / 25.0) * 40.0)
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color += sin(pos.x * sin(Time / 5.0) * 10.0) + sin(pos.y * sin(Time / 35.0) * 80.0)
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color *= sin(Time / 10.0) * 0.5
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return vec4(color, color * 0.5, sin(color + Time / 3.0 ) * 0.75, 1.0)
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}`
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type Game struct {
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shader *ebiten.Shader
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time int
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}
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func (g *Game) Update(screen *ebiten.Image) error {
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g.time++
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if g.shader == nil {
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var err error
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g.shader, err = ebiten.NewShader([]byte(shaderSrc))
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@ -80,7 +90,12 @@ func (g *Game) Draw(screen *ebiten.Image) {
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},
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}
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is := []uint16{0, 1, 2, 1, 2, 3}
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screen.DrawTrianglesWithShader(vs, is, g.shader, nil)
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op := &ebiten.DrawTrianglesWithShaderOptions{}
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op.Uniforms = []interface{}{
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float32(g.time) / 60, // time
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}
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screen.DrawTrianglesWithShader(vs, is, g.shader, op)
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}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
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@ -285,7 +285,7 @@ func (g *Graphics) useProgram(program program, uniforms []uniformVariable) error
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}
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g.context.bindTexture(v)
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default:
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return fmt.Errorf("opengl: unexpected uniform value: %v", u.value)
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return fmt.Errorf("opengl: unexpected uniform value: %v (type: %T)", u.value, u.value)
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}
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}
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return nil
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@ -557,7 +557,9 @@ func (cs *compileState) parseBlock(outer *block, b *ast.BlockStmt, inParams, out
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if len(ts) > 1 {
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cs.addError(l.Pos(), fmt.Sprintf("single-value context and multiple-value context cannot be mixed"))
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}
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v.typ = ts[0]
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if len(ts) == 1 {
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v.typ = ts[0]
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}
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} else {
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if i == 0 {
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rhsTypes = cs.detectType(block, l.Rhs[0])
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@ -578,6 +580,40 @@ func (cs *compileState) parseBlock(outer *block, b *ast.BlockStmt, inParams, out
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return nil
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}
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cs.assign(block, l.Pos(), l.Lhs, l.Rhs)
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case token.ADD_ASSIGN, token.SUB_ASSIGN, token.MUL_ASSIGN, token.QUO_ASSIGN, token.REM_ASSIGN:
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var op shaderir.Op
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switch l.Tok {
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case token.ADD_ASSIGN:
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op = shaderir.Add
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case token.SUB_ASSIGN:
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op = shaderir.Sub
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case token.MUL_ASSIGN:
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op = shaderir.Mul
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case token.QUO_ASSIGN:
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op = shaderir.Div
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case token.REM_ASSIGN:
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op = shaderir.ModOp
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}
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rhs, stmts := cs.parseExpr(block, l.Rhs[0])
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block.ir.Stmts = append(block.ir.Stmts, stmts...)
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lhs, stmts := cs.parseExpr(block, l.Lhs[0])
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block.ir.Stmts = append(block.ir.Stmts, stmts...)
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block.ir.Stmts = append(block.ir.Stmts, shaderir.Stmt{
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Type: shaderir.Assign,
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Exprs: []shaderir.Expr{
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lhs[0],
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{
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Type: shaderir.Binary,
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Op: op,
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Exprs: []shaderir.Expr{
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lhs[0],
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rhs[0],
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},
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},
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},
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})
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default:
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cs.addError(l.Pos(), fmt.Sprintf("unexpected token: %s", l.Tok))
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}
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case *ast.BlockStmt:
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b := cs.parseBlock(block, l, nil, nil)
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@ -72,6 +72,30 @@ func (cs *compileState) detectType(b *block, expr ast.Expr) []shaderir.Type {
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}
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cs.addError(expr.Pos(), fmt.Sprintf("unexpected literal: %s", e.Value))
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return nil
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case *ast.BinaryExpr:
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t1, t2 := cs.detectType(b, e.X), cs.detectType(b, e.Y)
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if len(t1) != 1 || len(t2) != 1 {
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cs.addError(expr.Pos(), fmt.Sprintf("binary operator cannot be used for multiple-value context: %v", expr))
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return nil
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}
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if !t1[0].Equal(&t2[0]) {
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// TODO: Move this checker to shaderir
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if t1[0].Main == shaderir.Float {
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switch t2[0].Main {
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case shaderir.Vec2, shaderir.Vec3, shaderir.Vec4:
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return t2
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}
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}
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if t2[0].Main == shaderir.Float {
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switch t1[0].Main {
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case shaderir.Vec2, shaderir.Vec3, shaderir.Vec4:
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return t1
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}
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}
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cs.addError(expr.Pos(), fmt.Sprintf("types between a binary operator don't match"))
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return nil
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}
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return t1
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case *ast.CallExpr:
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n := e.Fun.(*ast.Ident).Name
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f, ok := shaderir.ParseBuiltinFunc(n)
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@ -127,8 +151,34 @@ func (cs *compileState) detectType(b *block, expr ast.Expr) []shaderir.Type {
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}
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cs.addError(expr.Pos(), fmt.Sprintf("unexpected identifier: %s", n))
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return nil
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//case *ast.SelectorExpr:
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//return fmt.Sprintf("%cs.%s", dumpExpr(e.X), dumpExpr(e.Sel))
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case *ast.SelectorExpr:
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t := cs.detectType(b, e.X)
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if len(t) != 1 {
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cs.addError(expr.Pos(), fmt.Sprintf("selector is not available in multiple-value context: %v", e.X))
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return nil
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}
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switch t[0].Main {
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case shaderir.Vec2, shaderir.Vec3, shaderir.Vec4:
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switch len(e.Sel.Name) {
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case 1:
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return []shaderir.Type{{Main: shaderir.Float}}
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case 2:
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return []shaderir.Type{{Main: shaderir.Vec2}}
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case 3:
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return []shaderir.Type{{Main: shaderir.Float}}
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case 4:
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return []shaderir.Type{{Main: shaderir.Float}}
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default:
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cs.addError(expr.Pos(), fmt.Sprintf("invalid selector: %s", e.Sel.Name))
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}
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return nil
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case shaderir.Struct:
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cs.addError(expr.Pos(), fmt.Sprintf("selector for a struct is not implemented yet"))
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return nil
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default:
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cs.addError(expr.Pos(), fmt.Sprintf("selector is not available for: %v", expr))
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return nil
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}
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default:
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cs.addError(expr.Pos(), fmt.Sprintf("detecting type not implemented: %#v", expr))
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return nil
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@ -25,6 +25,24 @@ type Type struct {
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Length int
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}
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func (t *Type) Equal(rhs *Type) bool {
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if t.Main != rhs.Main {
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return false
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}
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if t.Length != rhs.Length {
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return false
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}
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if len(t.Sub) != len(rhs.Sub) {
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return false
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}
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for i, s := range t.Sub {
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if !s.Equal(&rhs.Sub[i]) {
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return false
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}
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}
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return true
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}
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func (t *Type) serialize() string {
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switch t.Main {
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case None:
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