mirror of
https://github.com/make-42/xyosc
synced 2025-01-19 11:07:35 +01:00
411 lines
15 KiB
Go
411 lines
15 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 ebiten
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import (
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"fmt"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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)
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// Blend is a blending way of the source color and the destination color.
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//
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// The final color is calculated like this:
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//
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// c_src: source RGB values
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// c_dst: destination RGB values
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// c_out: result RGB values
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// α_src: source alpha values
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// α_dst: destination alpha values
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// α_out: result alpha values
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//
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// c_out = BlendOperationRGB((BlendFactorSourceRGB) × c_src, (BlendFactorDestinationRGB) × c_dst)
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// α_out = BlendOperationAlpha((BlendFactorSourceAlpha) × α_src, (BlendFactorDestinationAlpha) × α_dst)
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//
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// A blend factor is a factor for source and color destination color values.
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// The default is source-over (regular alpha blending).
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//
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// A blend operation is a binary operator of a source color and a destination color.
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// The default is adding.
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type Blend struct {
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// BlendFactorSourceRGB is a factor for source RGB values.
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BlendFactorSourceRGB BlendFactor
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// BlendFactorSourceAlpha is a factor for source alpha values.
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BlendFactorSourceAlpha BlendFactor
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// BlendFactorDestinationRGB is a factor for destination RGB values.
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BlendFactorDestinationRGB BlendFactor
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// BlendFactorDestinationAlpha is a factor for destination alpha values.
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BlendFactorDestinationAlpha BlendFactor
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// BlendOperationRGB is an operation for source and destination RGB values.
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BlendOperationRGB BlendOperation
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// BlendOperationAlpha is an operation for source and destination alpha values.
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BlendOperationAlpha BlendOperation
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}
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var (
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defaultBlendInternalBlend = graphicsdriver.Blend{
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BlendFactorSourceRGB: BlendFactorDefault.internalBlendFactor(true),
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BlendFactorSourceAlpha: BlendFactorDefault.internalBlendFactor(true),
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BlendFactorDestinationRGB: BlendFactorDefault.internalBlendFactor(false),
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BlendFactorDestinationAlpha: BlendFactorDefault.internalBlendFactor(false),
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BlendOperationRGB: BlendOperationAdd.internalBlendOperation(),
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BlendOperationAlpha: BlendOperationAdd.internalBlendOperation(),
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}
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)
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func (b Blend) internalBlend() graphicsdriver.Blend {
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// A shortcut for the most common blend.
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if b == (Blend{}) {
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return defaultBlendInternalBlend
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}
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return graphicsdriver.Blend{
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BlendFactorSourceRGB: b.BlendFactorSourceRGB.internalBlendFactor(true),
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BlendFactorSourceAlpha: b.BlendFactorSourceAlpha.internalBlendFactor(true),
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BlendFactorDestinationRGB: b.BlendFactorDestinationRGB.internalBlendFactor(false),
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BlendFactorDestinationAlpha: b.BlendFactorDestinationAlpha.internalBlendFactor(false),
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BlendOperationRGB: b.BlendOperationRGB.internalBlendOperation(),
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BlendOperationAlpha: b.BlendOperationAlpha.internalBlendOperation(),
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}
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}
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// BlendFactor is a factor for source and destination color values.
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type BlendFactor byte
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const (
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// BlendFactorDefault is the default factor value.
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// The actual value depends on which source or destination this value is used.
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BlendFactorDefault BlendFactor = iota
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// BlendFactorZero is a factor:
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//
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// 0
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BlendFactorZero
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// BlendFactorOne is a factor:
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//
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// 1
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BlendFactorOne
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// BlendFactorSourceColor is a factor:
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//
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// (source RGBA)
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BlendFactorSourceColor
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// BlendFactorOneMinusSourceColor is a factor:
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//
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// 1 - (source color)
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BlendFactorOneMinusSourceColor
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// BlendFactorSourceAlpha is a factor:
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//
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// (source alpha)
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BlendFactorSourceAlpha
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// BlendFactorOneMinusSourceAlpha is a factor:
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//
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// 1 - (source alpha)
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BlendFactorOneMinusSourceAlpha
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// BlendFactorDestinationColor is a factor:
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//
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// (destination RGBA)
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BlendFactorDestinationColor
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// BlendFactorOneMinusDestinationColor is a factor:
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//
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// 1 - (destination RGBA)
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BlendFactorOneMinusDestinationColor
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// BlendFactorDestinationAlpha is a factor:
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//
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// (destination alpha)
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BlendFactorDestinationAlpha
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// BlendFactorOneMinusDestinationAlpha is a factor:
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//
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// 1 - (destination alpha)
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BlendFactorOneMinusDestinationAlpha
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// TODO: Add BlendFactorSourceAlphaSaturated. This might not work well on some platforms like Steam SDK (#2382).
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)
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func (b BlendFactor) internalBlendFactor(source bool) graphicsdriver.BlendFactor {
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switch b {
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case BlendFactorDefault:
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// The default is the source-over composition (regular alpha blending).
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if source {
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return graphicsdriver.BlendFactorOne
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}
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return graphicsdriver.BlendFactorOneMinusSourceAlpha
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case BlendFactorZero:
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return graphicsdriver.BlendFactorZero
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case BlendFactorOne:
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return graphicsdriver.BlendFactorOne
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case BlendFactorSourceColor:
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return graphicsdriver.BlendFactorSourceColor
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case BlendFactorOneMinusSourceColor:
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return graphicsdriver.BlendFactorOneMinusSourceColor
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case BlendFactorSourceAlpha:
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return graphicsdriver.BlendFactorSourceAlpha
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case BlendFactorOneMinusSourceAlpha:
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return graphicsdriver.BlendFactorOneMinusSourceAlpha
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case BlendFactorDestinationColor:
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return graphicsdriver.BlendFactorDestinationColor
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case BlendFactorOneMinusDestinationColor:
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return graphicsdriver.BlendFactorOneMinusDestinationColor
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case BlendFactorDestinationAlpha:
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return graphicsdriver.BlendFactorDestinationAlpha
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case BlendFactorOneMinusDestinationAlpha:
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return graphicsdriver.BlendFactorOneMinusDestinationAlpha
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default:
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panic(fmt.Sprintf("ebiten: invalid blend factor: %d", b))
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}
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}
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// BlendOperation is an operation for source and destination color values.
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type BlendOperation byte
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const (
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// BlendOperationAdd represents adding the source and destination color.
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//
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// c_out = (BlendFactorSourceRGB) × c_src + (BlendFactorDestinationRGB) × c_dst
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// α_out = (BlendFactorSourceAlpha) × α_src + (BlendFactorDestinationAlpha) × α_dst
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BlendOperationAdd BlendOperation = iota
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// BlendOperationSubtract represents subtracting the source and destination color.
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//
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// c_out = (BlendFactorSourceRGB) × c_src - (BlendFactorDestinationRGB) × c_dst
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// α_out = (BlendFactorSourceAlpha) × α_src - (BlendFactorDestinationAlpha) × α_dst
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BlendOperationSubtract
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// BlendOperationReverseSubtract represents subtracting the source and destination color in a reversed order.
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//
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// c_out = (BlendFactorDestinationRGB) × c_dst - (BlendFactorSourceRGB) × c_src
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// α_out = (BlendFactorDestinationAlpha) × α_dst - (BlendFactorSourceAlpha) × α_src
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BlendOperationReverseSubtract
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// BlendOperationMin represents a minimum function for the source and destination color.
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// If BlendOperationMin is specified, blend factors are not used.
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//
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// c_out = min(c_dst, c_src)
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// α_out = min(α_dst, α_src)
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BlendOperationMin
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// BlendOperationMax represents a maximum function for the source and destination color.
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// If BlendOperationMax is specified, blend factors are not used.
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//
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// c_out = max(c_dst, c_src)
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// α_out = max(α_dst, α_src)
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BlendOperationMax
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)
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func (b BlendOperation) internalBlendOperation() graphicsdriver.BlendOperation {
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switch b {
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case BlendOperationAdd:
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return graphicsdriver.BlendOperationAdd
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case BlendOperationSubtract:
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return graphicsdriver.BlendOperationSubtract
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case BlendOperationReverseSubtract:
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return graphicsdriver.BlendOperationReverseSubtract
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case BlendOperationMin:
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return graphicsdriver.BlendOperationMin
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case BlendOperationMax:
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return graphicsdriver.BlendOperationMax
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default:
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panic(fmt.Sprintf("ebiten: invalid blend operation: %d", b))
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}
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}
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// This name convention follows CSS compositing: https://drafts.fxtf.org/compositing-2/.
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//
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// In the comments,
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// c_src, c_dst and c_out represent alpha-premultiplied RGB values of source, destination and output respectively. α_src and α_dst represent alpha values of source and destination respectively.
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var (
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// BlendSourceOver is a preset Blend for the regular alpha blending.
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//
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// c_out = c_src + c_dst × (1 - α_src)
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// α_out = α_src + α_dst × (1 - α_src)
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BlendSourceOver = Blend{
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BlendFactorSourceRGB: BlendFactorOne,
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BlendFactorSourceAlpha: BlendFactorOne,
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BlendFactorDestinationRGB: BlendFactorOneMinusSourceAlpha,
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BlendFactorDestinationAlpha: BlendFactorOneMinusSourceAlpha,
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BlendOperationRGB: BlendOperationAdd,
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BlendOperationAlpha: BlendOperationAdd,
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}
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// BlendClear is a preset Blend for Porter Duff's 'clear'.
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//
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// c_out = 0
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// α_out = 0
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BlendClear = Blend{
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BlendFactorSourceRGB: BlendFactorZero,
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BlendFactorSourceAlpha: BlendFactorZero,
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BlendFactorDestinationRGB: BlendFactorZero,
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BlendFactorDestinationAlpha: BlendFactorZero,
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BlendOperationRGB: BlendOperationAdd,
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BlendOperationAlpha: BlendOperationAdd,
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}
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// BlendCopy is a preset Blend for Porter Duff's 'copy'.
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//
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// c_out = c_src
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// α_out = α_src
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BlendCopy = Blend{
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BlendFactorSourceRGB: BlendFactorOne,
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BlendFactorSourceAlpha: BlendFactorOne,
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BlendFactorDestinationRGB: BlendFactorZero,
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BlendFactorDestinationAlpha: BlendFactorZero,
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BlendOperationRGB: BlendOperationAdd,
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BlendOperationAlpha: BlendOperationAdd,
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}
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// BlendDestination is a preset Blend for Porter Duff's 'destination'.
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//
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// c_out = c_dst
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// α_out = α_dst
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BlendDestination = Blend{
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BlendFactorSourceRGB: BlendFactorZero,
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BlendFactorSourceAlpha: BlendFactorZero,
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BlendFactorDestinationRGB: BlendFactorOne,
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BlendFactorDestinationAlpha: BlendFactorOne,
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BlendOperationRGB: BlendOperationAdd,
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BlendOperationAlpha: BlendOperationAdd,
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}
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// BlendDestinationOver is a preset Blend for Porter Duff's 'destination-over'.
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//
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// c_out = c_src × (1 - α_dst) + c_dst
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// α_out = α_src × (1 - α_dst) + α_dst
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BlendDestinationOver = Blend{
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BlendFactorSourceRGB: BlendFactorOneMinusDestinationAlpha,
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BlendFactorSourceAlpha: BlendFactorOneMinusDestinationAlpha,
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BlendFactorDestinationRGB: BlendFactorOne,
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BlendFactorDestinationAlpha: BlendFactorOne,
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BlendOperationRGB: BlendOperationAdd,
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BlendOperationAlpha: BlendOperationAdd,
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}
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// BlendSourceIn is a preset Blend for Porter Duff's 'source-in'.
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//
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// c_out = c_src × α_dst
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// α_out = α_src × α_dst
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BlendSourceIn = Blend{
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BlendFactorSourceRGB: BlendFactorDestinationAlpha,
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BlendFactorSourceAlpha: BlendFactorDestinationAlpha,
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BlendFactorDestinationRGB: BlendFactorZero,
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BlendFactorDestinationAlpha: BlendFactorZero,
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BlendOperationRGB: BlendOperationAdd,
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BlendOperationAlpha: BlendOperationAdd,
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}
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// BlendDestinationIn is a preset Blend for Porter Duff's 'destination-in'.
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//
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// c_out = c_dst × α_src
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// α_out = α_dst × α_src
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BlendDestinationIn = Blend{
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BlendFactorSourceRGB: BlendFactorZero,
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BlendFactorSourceAlpha: BlendFactorZero,
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BlendFactorDestinationRGB: BlendFactorSourceAlpha,
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BlendFactorDestinationAlpha: BlendFactorSourceAlpha,
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BlendOperationRGB: BlendOperationAdd,
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BlendOperationAlpha: BlendOperationAdd,
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}
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// BlendSourceOut is a preset Blend for Porter Duff's 'source-out'.
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//
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// c_out = c_src × (1 - α_dst)
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// α_out = α_src × (1 - α_dst)
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BlendSourceOut = Blend{
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BlendFactorSourceRGB: BlendFactorOneMinusDestinationAlpha,
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BlendFactorSourceAlpha: BlendFactorOneMinusDestinationAlpha,
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BlendFactorDestinationRGB: BlendFactorZero,
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BlendFactorDestinationAlpha: BlendFactorZero,
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BlendOperationRGB: BlendOperationAdd,
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BlendOperationAlpha: BlendOperationAdd,
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}
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// BlendDestinationOut is a preset Blend for Porter Duff's 'destination-out'.
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//
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|||
|
|
// c_out = c_dst × (1 - α_src)
|
|||
|
|
// α_out = α_dst × (1 - α_src)
|
|||
|
|
BlendDestinationOut = Blend{
|
|||
|
|
BlendFactorSourceRGB: BlendFactorZero,
|
|||
|
|
BlendFactorSourceAlpha: BlendFactorZero,
|
|||
|
|
BlendFactorDestinationRGB: BlendFactorOneMinusSourceAlpha,
|
|||
|
|
BlendFactorDestinationAlpha: BlendFactorOneMinusSourceAlpha,
|
|||
|
|
BlendOperationRGB: BlendOperationAdd,
|
|||
|
|
BlendOperationAlpha: BlendOperationAdd,
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// BlendSourceAtop is a preset Blend for Porter Duff's 'source-atop'.
|
|||
|
|
//
|
|||
|
|
// c_out = c_src × α_dst + c_dst × (1 - α_src)
|
|||
|
|
// α_out = α_src × α_dst + α_dst × (1 - α_src)
|
|||
|
|
BlendSourceAtop = Blend{
|
|||
|
|
BlendFactorSourceRGB: BlendFactorDestinationAlpha,
|
|||
|
|
BlendFactorSourceAlpha: BlendFactorDestinationAlpha,
|
|||
|
|
BlendFactorDestinationRGB: BlendFactorOneMinusSourceAlpha,
|
|||
|
|
BlendFactorDestinationAlpha: BlendFactorOneMinusSourceAlpha,
|
|||
|
|
BlendOperationRGB: BlendOperationAdd,
|
|||
|
|
BlendOperationAlpha: BlendOperationAdd,
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// BlendDestinationAtop is a preset Blend for Porter Duff's 'destination-atop'.
|
|||
|
|
//
|
|||
|
|
// c_out = c_src × (1 - α_dst) + c_dst × α_src
|
|||
|
|
// α_out = α_src × (1 - α_dst) + α_dst × α_src
|
|||
|
|
BlendDestinationAtop = Blend{
|
|||
|
|
BlendFactorSourceRGB: BlendFactorOneMinusDestinationAlpha,
|
|||
|
|
BlendFactorSourceAlpha: BlendFactorOneMinusDestinationAlpha,
|
|||
|
|
BlendFactorDestinationRGB: BlendFactorSourceAlpha,
|
|||
|
|
BlendFactorDestinationAlpha: BlendFactorSourceAlpha,
|
|||
|
|
BlendOperationRGB: BlendOperationAdd,
|
|||
|
|
BlendOperationAlpha: BlendOperationAdd,
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// BlendXor is a preset Blend for Porter Duff's 'xor'.
|
|||
|
|
//
|
|||
|
|
// c_out = c_src × (1 - α_dst) + c_dst × (1 - α_src)
|
|||
|
|
// α_out = α_src × (1 - α_dst) + α_dst × (1 - α_src)
|
|||
|
|
BlendXor = Blend{
|
|||
|
|
BlendFactorSourceRGB: BlendFactorOneMinusDestinationAlpha,
|
|||
|
|
BlendFactorSourceAlpha: BlendFactorOneMinusDestinationAlpha,
|
|||
|
|
BlendFactorDestinationRGB: BlendFactorOneMinusSourceAlpha,
|
|||
|
|
BlendFactorDestinationAlpha: BlendFactorOneMinusSourceAlpha,
|
|||
|
|
BlendOperationRGB: BlendOperationAdd,
|
|||
|
|
BlendOperationAlpha: BlendOperationAdd,
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// BlendLighter is a preset Blend for Porter Duff's 'lighter'.
|
|||
|
|
// This is sum of source and destination (a.k.a. 'plus' or 'additive')
|
|||
|
|
//
|
|||
|
|
// c_out = c_src + c_dst
|
|||
|
|
// α_out = α_src + α_dst
|
|||
|
|
BlendLighter = Blend{
|
|||
|
|
BlendFactorSourceRGB: BlendFactorOne,
|
|||
|
|
BlendFactorSourceAlpha: BlendFactorOne,
|
|||
|
|
BlendFactorDestinationRGB: BlendFactorOne,
|
|||
|
|
BlendFactorDestinationAlpha: BlendFactorOne,
|
|||
|
|
BlendOperationRGB: BlendOperationAdd,
|
|||
|
|
BlendOperationAlpha: BlendOperationAdd,
|
|||
|
|
}
|
|||
|
|
)
|