mirror of
https://github.com/hajimehoshi/ebiten.git
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81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
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// Copyright 2022 The Ebitengine 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 colorm
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import (
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"fmt"
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"sync"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/internal/builtinshader"
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)
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// Dim is a dimension of a ColorM.
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const Dim = ebiten.ColorMDim
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// ColorM represents a matrix to transform coloring when rendering an image.
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//
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// ColorM is applied to the straight alpha color
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// while an Image's pixels' format is alpha premultiplied.
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// Before applying a matrix, a color is un-multiplied, and after applying the matrix,
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// the color is multiplied again.
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//
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// The initial value is identity.
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type ColorM = ebiten.ColorM
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func uniforms(c ColorM) map[string]interface{} {
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var body [16]float32
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var translation [4]float32
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c.ReadElements(body[:], translation[:])
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uniforms := map[string]interface{}{}
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uniforms[builtinshader.UniformColorMBody] = body[:]
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uniforms[builtinshader.UniformColorMTranslation] = translation[:]
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return uniforms
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}
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type builtinShaderKey struct {
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filter builtinshader.Filter
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address builtinshader.Address
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}
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var (
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builtinShaders = map[builtinShaderKey]*ebiten.Shader{}
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builtinShadersM sync.Mutex
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)
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func builtinShader(filter builtinshader.Filter, address builtinshader.Address) *ebiten.Shader {
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builtinShadersM.Lock()
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defer builtinShadersM.Unlock()
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key := builtinShaderKey{
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filter: filter,
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address: address,
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}
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if s, ok := builtinShaders[key]; ok {
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return s
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}
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src := builtinshader.Shader(filter, address, true)
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s, err := ebiten.NewShader(src)
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if err != nil {
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panic(fmt.Sprintf("colorm: NewShader for a built-in shader failed: %v", err))
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}
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shader := s
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builtinShaders[key] = shader
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return shader
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}
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