mirror of
https://github.com/hajimehoshi/ebiten.git
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126 lines
2.2 KiB
Go
126 lines
2.2 KiB
Go
// Copyright 2020 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package shader
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import (
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"fmt"
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"go/ast"
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)
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type typ int
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// TODO: What about array types?
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const (
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typBool typ = iota
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typInt
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typFloat
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typVec2
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typVec3
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typVec4
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typMat2
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typMat3
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typMat4
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typSampler2d
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)
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func parseType(expr ast.Expr) (typ, error) {
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switch t := expr.(type) {
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case *ast.Ident:
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switch t.Name {
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case "bool":
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return typBool, nil
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case "int":
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return typInt, nil
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case "float":
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return typFloat, nil
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case "vec2":
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return typVec2, nil
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case "vec3":
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return typVec3, nil
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case "vec4":
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return typVec4, nil
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case "mat2":
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return typMat2, nil
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case "mat3":
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return typMat3, nil
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case "mat4":
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return typMat4, nil
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case "sampler2d":
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return typSampler2d, nil
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}
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// TODO: Parse array types
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}
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return 0, fmt.Errorf("invalid type: %s", expr)
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}
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func (t typ) String() string {
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switch t {
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case typBool:
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return "bool"
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case typInt:
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return "int"
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case typFloat:
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return "float"
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case typVec2:
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return "vec2"
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case typVec3:
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return "vec3"
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case typVec4:
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return "vec4"
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case typMat2:
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return "mat2"
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case typMat3:
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return "mat3"
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case typMat4:
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return "mat4"
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case typSampler2d:
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return "sampler2d"
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default:
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return fmt.Sprintf("unknown(%d)", t)
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}
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}
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func (t typ) numeric() bool {
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return t != typSampler2d
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}
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func (t typ) glslString() string {
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switch t {
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case typBool:
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return "bool"
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case typInt:
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return "int"
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case typFloat:
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return "float"
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case typVec2:
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return "vec2"
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case typVec3:
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return "vec3"
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case typVec4:
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return "vec4"
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case typMat2:
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return "mat2"
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case typMat3:
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return "mat3"
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case typMat4:
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return "mat4"
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case typSampler2d:
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return "?(sampler2d)"
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default:
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return fmt.Sprintf("?(%d)", t)
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}
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}
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