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blend.go
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blend.go
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// Copyright 2022 The Ebitengine 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 graphicsdriver
type Blend struct {
BlendFactorSourceRGB BlendFactor
BlendFactorSourceAlpha BlendFactor
BlendFactorDestinationRGB BlendFactor
BlendFactorDestinationAlpha BlendFactor
BlendOperationRGB BlendOperation
BlendOperationAlpha BlendOperation
}
type BlendFactor byte
const (
BlendFactorZero BlendFactor = iota
BlendFactorOne
BlendFactorSourceColor
BlendFactorOneMinusSourceColor
BlendFactorSourceAlpha
BlendFactorOneMinusSourceAlpha
BlendFactorDestinationColor
BlendFactorOneMinusDestinationColor
BlendFactorDestinationAlpha
BlendFactorOneMinusDestinationAlpha
BlendFactorSourceAlphaSaturated
)
type BlendOperation byte
const (
BlendOperationAdd BlendOperation = iota
BlendOperationSubtract
BlendOperationReverseSubtract
BlendOperationMin
BlendOperationMax
)
var BlendSourceOver = Blend{
BlendFactorSourceRGB: BlendFactorOne,
BlendFactorSourceAlpha: BlendFactorOne,
BlendFactorDestinationRGB: BlendFactorOneMinusSourceAlpha,
BlendFactorDestinationAlpha: BlendFactorOneMinusSourceAlpha,
BlendOperationRGB: BlendOperationAdd,
BlendOperationAlpha: BlendOperationAdd,
}
var BlendClear = Blend{
BlendFactorSourceRGB: BlendFactorZero,
BlendFactorSourceAlpha: BlendFactorZero,
BlendFactorDestinationRGB: BlendFactorZero,
BlendFactorDestinationAlpha: BlendFactorZero,
BlendOperationRGB: BlendOperationAdd,
BlendOperationAlpha: BlendOperationAdd,
}
var BlendCopy = Blend{
BlendFactorSourceRGB: BlendFactorOne,
BlendFactorSourceAlpha: BlendFactorOne,
BlendFactorDestinationRGB: BlendFactorZero,
BlendFactorDestinationAlpha: BlendFactorZero,
BlendOperationRGB: BlendOperationAdd,
BlendOperationAlpha: BlendOperationAdd,
}