mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
101 lines
2.9 KiB
Go
101 lines
2.9 KiB
Go
// Copyright 2020 The Ebiten Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package shader
|
|
|
|
import (
|
|
"fmt"
|
|
"go/ast"
|
|
gconstant "go/constant"
|
|
|
|
"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
|
|
)
|
|
|
|
func (cs *compileState) parseType(block *block, expr ast.Expr) (shaderir.Type, bool) {
|
|
switch t := expr.(type) {
|
|
case *ast.Ident:
|
|
switch t.Name {
|
|
case "bool":
|
|
return shaderir.Type{Main: shaderir.Bool}, true
|
|
case "int":
|
|
return shaderir.Type{Main: shaderir.Int}, true
|
|
case "float":
|
|
return shaderir.Type{Main: shaderir.Float}, true
|
|
case "vec2":
|
|
return shaderir.Type{Main: shaderir.Vec2}, true
|
|
case "vec3":
|
|
return shaderir.Type{Main: shaderir.Vec3}, true
|
|
case "vec4":
|
|
return shaderir.Type{Main: shaderir.Vec4}, true
|
|
case "mat2":
|
|
return shaderir.Type{Main: shaderir.Mat2}, true
|
|
case "mat3":
|
|
return shaderir.Type{Main: shaderir.Mat3}, true
|
|
case "mat4":
|
|
return shaderir.Type{Main: shaderir.Mat4}, true
|
|
default:
|
|
cs.addError(t.Pos(), fmt.Sprintf("unexpected type: %s", t.Name))
|
|
return shaderir.Type{}, false
|
|
}
|
|
case *ast.ArrayType:
|
|
if t.Len == nil {
|
|
cs.addError(t.Pos(), fmt.Sprintf("array length must be specified"))
|
|
return shaderir.Type{}, false
|
|
}
|
|
var length int
|
|
if _, ok := t.Len.(*ast.Ellipsis); ok {
|
|
length = -1 // Determine the length later.
|
|
} else {
|
|
exprs, _, _, ok := cs.parseExpr(block, t.Len, true)
|
|
if !ok {
|
|
return shaderir.Type{}, false
|
|
}
|
|
if len(exprs) != 1 {
|
|
cs.addError(t.Pos(), fmt.Sprintf("invalid length of array"))
|
|
return shaderir.Type{}, false
|
|
}
|
|
if exprs[0].Type != shaderir.NumberExpr {
|
|
cs.addError(t.Pos(), fmt.Sprintf("length of array must be a constant number"))
|
|
return shaderir.Type{}, false
|
|
}
|
|
l, ok := gconstant.Int64Val(exprs[0].Const)
|
|
if !ok {
|
|
cs.addError(t.Pos(), fmt.Sprintf("length of array must be an integer"))
|
|
return shaderir.Type{}, false
|
|
}
|
|
length = int(l)
|
|
}
|
|
|
|
elm, ok := cs.parseType(block, t.Elt)
|
|
if !ok {
|
|
return shaderir.Type{}, false
|
|
}
|
|
if elm.Main == shaderir.Array {
|
|
cs.addError(t.Pos(), fmt.Sprintf("array of array is forbidden"))
|
|
return shaderir.Type{}, false
|
|
}
|
|
return shaderir.Type{
|
|
Main: shaderir.Array,
|
|
Sub: []shaderir.Type{elm},
|
|
Length: length,
|
|
}, true
|
|
case *ast.StructType:
|
|
cs.addError(t.Pos(), "struct is not implemented")
|
|
return shaderir.Type{}, false
|
|
default:
|
|
cs.addError(t.Pos(), fmt.Sprintf("unepxected type: %v", t))
|
|
return shaderir.Type{}, false
|
|
}
|
|
}
|