mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
// Copyright 2016 The Ebiten Authors
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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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// +build js
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package ebiten
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import (
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"math"
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"github.com/gopherjs/gopherjs/js"
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"github.com/hajimehoshi/ebiten/internal/graphics"
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)
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func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
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// TODO: This function should be in graphics package?
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totalSize := graphics.QuadVertexSizeInBytes() / 2
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oneSize := totalSize / 4
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l := parts.Len()
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a := js.Global.Get("ArrayBuffer").New(l * totalSize * 2)
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af32 := js.Global.Get("Float32Array").New(a)
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a16 := js.Global.Get("Int16Array").New(a)
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w := uint(0)
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h := uint(0)
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for (1 << w) < width {
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w++
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}
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for (1 << h) < height {
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h++
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}
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gs := []float64{geo.Element(0, 0),
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geo.Element(0, 1),
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geo.Element(1, 0),
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geo.Element(1, 1),
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geo.Element(0, 2),
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geo.Element(1, 2)}
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n := 0
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for i := 0; i < l; i++ {
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dx0, dy0, dx1, dy1 := parts.Dst(i)
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if dx0 == dx1 || dy0 == dy1 {
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continue
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}
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sx0, sy0, sx1, sy1 := parts.Src(i)
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if sx0 == sx1 || sy0 == sy1 {
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continue
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}
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u0 := (math.MaxInt16 * sx0) >> w
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v0 := (math.MaxInt16 * sy0) >> h
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u1 := (math.MaxInt16 * sx1) >> w
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v1 := (math.MaxInt16 * sy1) >> h
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offset := n * totalSize
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a16.SetIndex(offset, dx0)
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a16.SetIndex(offset+1, dy0)
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a16.SetIndex(offset+2, u0)
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a16.SetIndex(offset+3, v0)
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for j, g := range gs {
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af32.SetIndex((offset+4)/2+j, g)
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}
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offset += oneSize
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a16.SetIndex(offset, dx1)
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a16.SetIndex(offset+1, dy0)
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a16.SetIndex(offset+2, u1)
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a16.SetIndex(offset+3, v0)
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for j, g := range gs {
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af32.SetIndex((offset+4)/2+j, g)
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}
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offset += oneSize
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a16.SetIndex(offset, dx0)
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a16.SetIndex(offset+1, dy1)
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a16.SetIndex(offset+2, u0)
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a16.SetIndex(offset+3, v1)
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for j, g := range gs {
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af32.SetIndex((offset+4)/2+j, g)
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}
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offset += oneSize
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a16.SetIndex(offset, dx1)
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a16.SetIndex(offset+1, dy1)
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a16.SetIndex(offset+2, u1)
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a16.SetIndex(offset+3, v1)
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for j, g := range gs {
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af32.SetIndex((offset+4)/2+j, g)
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}
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n++
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}
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// TODO: Need to slice
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return a16.Interface().([]int16)
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}
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