ebiten/internal/opengl/types.go

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// 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 opengl
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type Filter int
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type ShaderType int
type BufferType int
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type BufferUsage int
type Mode int
type operation int
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type CompositeMode int
const (
CompositeModeSourceOver CompositeMode = iota // This value must be 0 (= initial value)
CompositeModeClear
CompositeModeCopy
CompositeModeDestination
CompositeModeDestinationOver
CompositeModeSourceIn
CompositeModeDestinationIn
CompositeModeSourceOut
CompositeModeDestinationOut
CompositeModeSourceAtop
CompositeModeDestinationAtop
CompositeModeXor
CompositeModeLighter
CompositeModeUnknown
)
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func operations(mode CompositeMode) (src operation, dst operation) {
switch mode {
case CompositeModeSourceOver:
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return one, oneMinusSrcAlpha
case CompositeModeClear:
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return zero, zero
case CompositeModeCopy:
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return one, zero
case CompositeModeDestination:
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return zero, one
case CompositeModeDestinationOver:
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return oneMinusDstAlpha, one
case CompositeModeSourceIn:
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return dstAlpha, zero
case CompositeModeDestinationIn:
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return zero, srcAlpha
case CompositeModeSourceOut:
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return oneMinusDstAlpha, zero
case CompositeModeDestinationOut:
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return zero, oneMinusSrcAlpha
case CompositeModeSourceAtop:
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return dstAlpha, oneMinusSrcAlpha
case CompositeModeDestinationAtop:
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return oneMinusDstAlpha, srcAlpha
case CompositeModeXor:
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return oneMinusDstAlpha, oneMinusSrcAlpha
case CompositeModeLighter:
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return one, one
default:
panic("not reach")
}
}
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type DataType int
func (d DataType) SizeInBytes() int {
switch d {
case Short:
return 2
case Float:
return 4
default:
panic("not reach")
}
}