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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"
"github.com/hajimehoshi/ebiten/v2"
"github.com/divVerent/aaaaxy/internal/vfs"
)
type shaderPath = struct {
Name string
ParamsSerialized string
}
var cache = map[shaderPath]*ebiten.Shader{}
func Load(name string, params map[string]string) (*ebiten.Shader, error) {
cacheName := vfs.Canonical("shaders", name)
sp := shaderPath{cacheName, 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: %v", err)
}
defer data.Close()
shaderCode, err := ioutil.ReadAll(data)
if err != nil {
return nil, fmt.Errorf("could not read shader %q: %v", name, err)
}
// Add some basic templating so we can remove branches from the shaders.
// Not using text/template so that shader files can still be processed by gofmt.
for name, value := range params {
shaderCode = bytes.ReplaceAll(shaderCode, []byte("PARAMS[\""+name+"\"]"), []byte("(("+value+"))"))
}
shader, err := ebiten.NewShader(shaderCode)
if err != nil {
return nil, fmt.Errorf("could not compile shader %q: %v", name, err)
}
cache[sp] = shader
return shader, nil
}