ebiten/internal/atlas/shader.go

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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
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import (
"runtime"
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"github.com/hajimehoshi/ebiten/v2/internal/restorable"
"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
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)
type Shader struct {
ir *shaderir.Program
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shader *restorable.Shader
}
func NewShader(ir *shaderir.Program) *Shader {
// A shader is initialized lazily, and the lock is not needed.
return &Shader{
ir: ir,
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}
}
func (s *Shader) ensureShader() *restorable.Shader {
if s.shader != nil {
return s.shader
}
s.shader = restorable.NewShader(s.ir)
runtime.SetFinalizer(s, func(shader *Shader) {
// A function from finalizer must not be blocked, but disposing operation can be blocked.
// Defer this operation until it becomes safe. (#913)
appendDeferred(func() {
shader.deallocate()
})
})
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()
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}
func (s *Shader) deallocate() {
runtime.SetFinalizer(s, nil)
if s.shader == nil {
return
}
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s.shader.Dispose()
s.shader = nil
}
var (
NearestFilterShader = &Shader{shader: restorable.NearestFilterShader}
LinearFilterShader = &Shader{shader: restorable.LinearFilterShader}
)