ebiten/internal/atlas/shader.go

83 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
name string
}
func NewShader(ir *shaderir.Program, name string) *Shader {
// A shader is initialized lazily, and the lock is not needed.
return &Shader{
ir: ir,
name: name,
}
}
func (s *Shader) finalize() {
// A function from finalizer must not be blocked, but disposing operation can be blocked.
// Defer this operation until it becomes safe. (#913)
appendDeferred(func() {
s.deallocate()
})
}
func (s *Shader) ensureShader() *restorable.Shader {
if s.shader != nil {
return s.shader
}
s.shader = restorable.NewShader(s.ir, s.name)
runtime.SetFinalizer(s, (*Shader).finalize)
return s.shader
}
// Deallocate deallocates the internal state.
func (s *Shader) Deallocate() {
backendsM.Lock()
defer backendsM.Unlock()
if !inFrame {
appendDeferred(func() {
s.deallocate()
})
return
}
s.deallocate()
}
func (s *Shader) deallocate() {
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}
)