mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
58 lines
2.4 KiB
Go
58 lines
2.4 KiB
Go
// Copyright 2014 Hajime Hoshi
|
|
//
|
|
// 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 ebiten
|
|
|
|
import (
|
|
"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
|
|
)
|
|
|
|
// Filter represents the type of filter to be used when an image is maginified or minified.
|
|
type Filter int
|
|
|
|
const (
|
|
FilterNearest Filter = iota // nearest (crisp-edged) filter
|
|
FilterLinear // linear filter
|
|
)
|
|
|
|
func glFilter(c *opengl.Context, filter Filter) opengl.Filter {
|
|
switch filter {
|
|
case FilterNearest:
|
|
return c.Nearest
|
|
case FilterLinear:
|
|
return c.Linear
|
|
}
|
|
panic("not reach")
|
|
}
|
|
|
|
// CompositeMode represents Porter-Duff composition mode.
|
|
type CompositeMode int
|
|
|
|
// Note: This name convention follow CSS compositing: https://drafts.fxtf.org/compositing-2/
|
|
|
|
const (
|
|
CompositeModeSourceOver CompositeMode = CompositeMode(opengl.CompositeModeSourceOver) // regular alpha blending
|
|
CompositeModeClear = CompositeMode(opengl.CompositeModeClear)
|
|
CompositeModeCopy = CompositeMode(opengl.CompositeModeCopy)
|
|
CompositeModeDestination = CompositeMode(opengl.CompositeModeDestination)
|
|
CompositeModeSourceIn = CompositeMode(opengl.CompositeModeSourceIn)
|
|
CompositeModeDestinationIn = CompositeMode(opengl.CompositeModeDestinationIn)
|
|
CompositeModeSourceOut = CompositeMode(opengl.CompositeModeSourceOut)
|
|
CompositeModeDestinationOut = CompositeMode(opengl.CompositeModeDestinationOut)
|
|
CompositeModeSourceAtop = CompositeMode(opengl.CompositeModeSourceAtop)
|
|
CompositeModeDestinationAtop = CompositeMode(opengl.CompositeModeDestinationAtop)
|
|
CompositeModeXor = CompositeMode(opengl.CompositeModeXor)
|
|
CompositeModeLighter = CompositeMode(opengl.CompositeModeLighter) // sum of source and destination (a.k.a. 'plus' or 'additive')
|
|
)
|