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- // 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}
- )
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