mirror of
https://github.com/hajimehoshi/ebiten.git
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88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
// Copyright 2014 Hajime Hoshi
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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 opengl
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type Filter int
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type ShaderType int
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type BufferType int
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type BufferUsage int
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type Mode int
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type operation int
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type CompositeMode int
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const (
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CompositeModeSourceOver CompositeMode = iota // This value must be 0 (= initial value)
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CompositeModeClear
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CompositeModeCopy
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CompositeModeDestination
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CompositeModeDestinationOver
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CompositeModeSourceIn
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CompositeModeDestinationIn
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CompositeModeSourceOut
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CompositeModeDestinationOut
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CompositeModeSourceAtop
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CompositeModeDestinationAtop
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CompositeModeXor
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CompositeModeLighter
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CompositeModeUnknown
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)
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func operations(mode CompositeMode) (src operation, dst operation) {
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switch mode {
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case CompositeModeSourceOver:
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return one, oneMinusSrcAlpha
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case CompositeModeClear:
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return zero, zero
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case CompositeModeCopy:
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return one, zero
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case CompositeModeDestination:
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return zero, one
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case CompositeModeDestinationOver:
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return oneMinusDstAlpha, one
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case CompositeModeSourceIn:
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return dstAlpha, zero
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case CompositeModeDestinationIn:
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return zero, srcAlpha
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case CompositeModeSourceOut:
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return oneMinusDstAlpha, zero
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case CompositeModeDestinationOut:
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return zero, oneMinusSrcAlpha
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case CompositeModeSourceAtop:
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return dstAlpha, oneMinusSrcAlpha
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case CompositeModeDestinationAtop:
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return oneMinusDstAlpha, srcAlpha
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case CompositeModeXor:
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return oneMinusDstAlpha, oneMinusSrcAlpha
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case CompositeModeLighter:
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return one, one
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default:
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panic("not reach")
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}
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}
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type DataType int
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func (d DataType) SizeInBytes() int {
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switch d {
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case Short:
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return 2
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case Float:
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return 4
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default:
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panic("not reach")
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}
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}
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