ebiten/internal/atlas/shader.go

72 lines
1.9 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 atlas
import (
"runtime"
"github.com/hajimehoshi/ebiten/v2/internal/restorable"
"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
)
type Shader struct {
ir *shaderir.Program
shader *restorable.Shader
}
func NewShader(ir *shaderir.Program) *Shader {
// A shader is initialized lazily, and the lock is not needed.
return &Shader{
ir: ir,
}
}
func (s *Shader) ensureShader() *restorable.Shader {
if s.shader != nil {
return s.shader
}
s.shader = restorable.NewShader(s.ir)
s.ir = nil
return s.shader
}
// MarkDisposed marks the shader as disposed. The actual operation is deferred.
// MarkDisposed can be called from finalizers.
//
// A function from finalizer must not be blocked, but disposing operation can be blocked.
// Defer this operation until it becomes safe. (#913)
func (s *Shader) MarkDisposed() {
// As MarkDisposed can be invoked from finalizers, backendsM should not be used.
deferredM.Lock()
deferred = append(deferred, func() {
s.dispose()
})
deferredM.Unlock()
}
func (s *Shader) dispose() {
runtime.SetFinalizer(s, nil)
if s.shader == nil {
return
}
s.shader.Dispose()
s.shader = nil
}
var (
NearestFilterShader = &Shader{shader: restorable.NearestFilterShader}
LinearFilterShader = &Shader{shader: restorable.LinearFilterShader}
)