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shader.go
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shader.go
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// Copyright 2021 Google LLC
//
// 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 (
"bytes"
"fmt"
"io/ioutil"
"text/template"
"github.com/hajimehoshi/ebiten/v2"
"github.com/divVerent/aaaaxy/internal/flag"
"github.com/divVerent/aaaaxy/internal/vfs"
)
var (
debugUseShaders = flag.Bool("debug_use_shaders", true, "enable use of custom shaders")
)
type shaderPath = struct {
Name string
ParamsSerialized string
}
var cache = map[shaderPath]*ebiten.Shader{}
func Load(name string, params interface{}) (*ebiten.Shader, error) {
if !*debugUseShaders {
return nil, fmt.Errorf("shader support has been turned off using --debug_use_shaders=false")
}
sp := shaderPath{name, fmt.Sprint(params)}
if shader, found := cache[sp]; found {
return shader, nil
}
data, err := vfs.Load("shaders", name)
if err != nil {
return nil, fmt.Errorf("could not load: %w", err)
}
defer data.Close()
shaderCode, err := ioutil.ReadAll(data)
if err != nil {
return nil, fmt.Errorf("could not read shader %q: %w", name, err)
}
tmpl, err := template.New("name").Delims("T[\"", "\"]").Parse(string(shaderCode))
if err != nil {
return nil, fmt.Errorf("could not parse shader template %q: %w", name, err)
}
var buf bytes.Buffer
err = tmpl.Execute(&buf, params)
if err != nil {
return nil, fmt.Errorf("could not execute shader template %q: %w", name, err)
}
shader, err := ebiten.NewShader(buf.Bytes())
if err != nil {
return nil, fmt.Errorf("could not compile shader %q: %w", name, err)
}
cache[sp] = shader
return shader, nil
}