ebiten/internal/graphicsdriver/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 {
BlendFactorSourceColor BlendFactor
BlendFactorSourceAlpha BlendFactor
BlendFactorDestinationColor BlendFactor
BlendFactorDestinationAlpha BlendFactor
BlendOperationColor BlendOperation
BlendOperationAlpha BlendOperation
}
type BlendFactor byte
const (
BlendFactorZero BlendFactor = iota
BlendFactorOne
BlendFactorSourceAlpha
BlendFactorDestinationAlpha
BlendFactorOneMinusSourceAlpha
BlendFactorOneMinusDestinationAlpha
BlendFactorDestinationColor
)
type BlendOperation byte
const (
BlendOperationAdd BlendOperation = iota
// TODO: Add more operators
)
var BlendSourceOver = Blend{
BlendFactorSourceColor: BlendFactorOne,
BlendFactorSourceAlpha: BlendFactorOne,
BlendFactorDestinationColor: BlendFactorOneMinusSourceAlpha,
BlendFactorDestinationAlpha: BlendFactorOneMinusSourceAlpha,
BlendOperationColor: BlendOperationAdd,
BlendOperationAlpha: BlendOperationAdd,
}
var BlendClear = Blend{
BlendFactorSourceColor: BlendFactorZero,
BlendFactorSourceAlpha: BlendFactorZero,
BlendFactorDestinationColor: BlendFactorZero,
BlendFactorDestinationAlpha: BlendFactorZero,
BlendOperationColor: BlendOperationAdd,
BlendOperationAlpha: BlendOperationAdd,
}
var BlendCopy = Blend{
BlendFactorSourceColor: BlendFactorOne,
BlendFactorSourceAlpha: BlendFactorOne,
BlendFactorDestinationColor: BlendFactorZero,
BlendFactorDestinationAlpha: BlendFactorZero,
BlendOperationColor: BlendOperationAdd,
BlendOperationAlpha: BlendOperationAdd,
}