shaderir: Add (*Type).serialize again

internal/shaderir/glsl.go

@@ -60,7 +60,7 @@ func (p *Program) structName(t *Type) string {
 	if t.Main != Struct {
 		panic("shaderir: the given type at structName must be a struct")
 	}
-	s := t.String()
+	s := t.serialize()
 	if n, ok := p.structNames[s]; ok {
 		return n
 	}

internal/shaderir/type.go

@@ -66,7 +66,7 @@ func (t *Type) String() string {
 	case Mat4:
 		return "mat4"
 	case Texture2D:
-		return "sampler2D"
+		return "texture2D"
 	case Array:
 		return fmt.Sprintf("%s[%d]", t.Sub[0].String(), t.Length)
 	case Struct:
@@ -83,6 +83,10 @@ func (t *Type) String() string {
 	}
 }
 
+func (t *Type) serialize() string {
+	return t.String()
+}
+
 type BasicType int
 
 // For a texture, a name Texture2D is used instead of Sampler2D. A sampler is a combination of a texture and how to