vendor dependencies, make some changes to how input is done

vendor/github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/blend.go

@@ -0,0 +1,77 @@
+// 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,
+}