mirror of
https://github.com/hajimehoshi/ebiten.git
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121 lines
3.4 KiB
Go
121 lines
3.4 KiB
Go
// Copyright 2020 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ebiten
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import (
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"fmt"
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"sync"
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"github.com/hajimehoshi/ebiten/v2/internal/builtinshader"
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"github.com/hajimehoshi/ebiten/v2/internal/graphics"
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"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
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"github.com/hajimehoshi/ebiten/v2/internal/ui"
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)
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// Shader represents a compiled shader program.
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//
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// For the details about the shader, see https://ebitengine.org/en/documents/shader.html.
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type Shader struct {
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shader *ui.Shader
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unit shaderir.Unit
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}
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// NewShader compiles a shader program in the shading language Kage, and returns the result.
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//
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// If the compilation fails, NewShader returns an error.
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//
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// For the details about the shader, see https://ebitengine.org/en/documents/shader.html.
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func NewShader(src []byte) (*Shader, error) {
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ir, err := graphics.CompileShader(src)
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if err != nil {
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return nil, err
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}
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return &Shader{
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shader: ui.NewShader(ir),
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unit: ir.Unit,
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}, nil
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}
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// Dispose disposes the shader program.
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// After disposing, the shader is no longer available.
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//
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// Deprecated: as of v2.7. Use Deallocate instead.
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func (s *Shader) Dispose() {
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s.shader.Deallocate()
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s.shader = nil
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}
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func (s *Shader) isDisposed() bool {
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return s.shader == nil
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}
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// Deallocate deallocates the internal state of the shader.
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// Even after Deallocate is called, the shader is still available.
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// In this case, the shader's internal state is allocated again.
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//
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// Usually, you don't have to call Deallocate since the internal state is automatically released by GC.
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// However, if you are sure that the shader is no longer used but not sure how this shader object is referred,
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// you can call Deallocate to make sure that the internal state is deallocated.
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//
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// If the shader is disposed, Deallocate does nothing.
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func (s *Shader) Deallocate() {
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if s.shader == nil {
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return
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}
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s.shader.Deallocate()
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}
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func (s *Shader) appendUniforms(dst []uint32, uniforms map[string]any) []uint32 {
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return s.shader.AppendUniforms(dst, uniforms)
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}
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var (
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builtinShaders [builtinshader.FilterCount][builtinshader.AddressCount][2]*Shader
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builtinShadersM sync.Mutex
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)
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func builtinShader(filter builtinshader.Filter, address builtinshader.Address, useColorM bool) *Shader {
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builtinShadersM.Lock()
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defer builtinShadersM.Unlock()
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var c int
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if useColorM {
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c = 1
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}
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if s := builtinShaders[filter][address][c]; s != nil {
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return s
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}
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var shader *Shader
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if address == builtinshader.AddressUnsafe && !useColorM {
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switch filter {
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case builtinshader.FilterNearest:
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shader = &Shader{shader: ui.NearestFilterShader}
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case builtinshader.FilterLinear:
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shader = &Shader{shader: ui.LinearFilterShader}
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}
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} else {
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src := builtinshader.ShaderSource(filter, address, useColorM)
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s, err := NewShader(src)
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if err != nil {
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panic(fmt.Sprintf("ebiten: NewShader for a built-in shader failed: %v", err))
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}
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shader = s
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}
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builtinShaders[filter][address][c] = shader
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return shader
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}
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