mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
90 lines
2.6 KiB
Go
90 lines
2.6 KiB
Go
// Copyright 2016 The Ebiten 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.
|
|
|
|
// +build js
|
|
|
|
package ebiten
|
|
|
|
import (
|
|
"math"
|
|
|
|
"github.com/gopherjs/gopherjs/js"
|
|
"github.com/hajimehoshi/ebiten/internal/graphics"
|
|
)
|
|
|
|
func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
|
|
// TODO: This function should be in graphics package?
|
|
totalSize := graphics.QuadVertexSizeInBytes() / 2
|
|
oneSize := totalSize / 4
|
|
l := parts.Len()
|
|
a := js.Global.Get("ArrayBuffer").New(l * totalSize * 2)
|
|
af32 := js.Global.Get("Float32Array").New(a)
|
|
a16 := js.Global.Get("Int16Array").New(a)
|
|
w2p := graphics.NextPowerOf2Int(width)
|
|
h2p := graphics.NextPowerOf2Int(height)
|
|
gs := []float64{geo.Element(0, 0),
|
|
geo.Element(0, 1),
|
|
geo.Element(1, 0),
|
|
geo.Element(1, 1),
|
|
geo.Element(0, 2),
|
|
geo.Element(1, 2)}
|
|
n := 0
|
|
for i := 0; i < l; i++ {
|
|
dx0, dy0, dx1, dy1 := parts.Dst(i)
|
|
if dx0 == dx1 || dy0 == dy1 {
|
|
continue
|
|
}
|
|
sx0, sy0, sx1, sy1 := parts.Src(i)
|
|
if sx0 == sx1 || sy0 == sy1 {
|
|
continue
|
|
}
|
|
u0 := math.MaxInt16 * sx0 / w2p
|
|
v0 := math.MaxInt16 * sy0 / h2p
|
|
u1 := math.MaxInt16 * sx1 / w2p
|
|
v1 := math.MaxInt16 * sy1 / h2p
|
|
offset := n * totalSize
|
|
a16.SetIndex(offset, dx0)
|
|
a16.SetIndex(offset+1, dy0)
|
|
a16.SetIndex(offset+2, u0)
|
|
a16.SetIndex(offset+3, v0)
|
|
for j, g := range gs {
|
|
af32.SetIndex((offset+4)/2+j, g)
|
|
}
|
|
a16.SetIndex(offset+oneSize, dx1)
|
|
a16.SetIndex(offset+oneSize+1, dy0)
|
|
a16.SetIndex(offset+oneSize+2, u1)
|
|
a16.SetIndex(offset+oneSize+3, v0)
|
|
for j, g := range gs {
|
|
af32.SetIndex((offset+oneSize+4)/2+j, g)
|
|
}
|
|
a16.SetIndex(offset+2*oneSize, dx0)
|
|
a16.SetIndex(offset+2*oneSize+1, dy1)
|
|
a16.SetIndex(offset+2*oneSize+2, u0)
|
|
a16.SetIndex(offset+2*oneSize+3, v1)
|
|
for j, g := range gs {
|
|
af32.SetIndex((offset+2*oneSize+4)/2+j, g)
|
|
}
|
|
a16.SetIndex(offset+3*oneSize, dx1)
|
|
a16.SetIndex(offset+3*oneSize+1, dy1)
|
|
a16.SetIndex(offset+3*oneSize+2, u1)
|
|
a16.SetIndex(offset+3*oneSize+3, v1)
|
|
for j, g := range gs {
|
|
af32.SetIndex((offset+3*oneSize+4)/2+j, g)
|
|
}
|
|
n++
|
|
}
|
|
// TODO: Need to slice
|
|
return a16.Interface().([]int16)
|
|
}
|