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https://github.com/hajimehoshi/ebiten.git
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graphics: Use shift instead of div
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parent
bf76e94ad2
commit
b77a28b208
15
vertices.go
15
vertices.go
@ -52,8 +52,14 @@ func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
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oneSize := totalSize / 4
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l := parts.Len()
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vs := make([]int16, l*totalSize)
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width2p := graphics.NextPowerOf2Int(width)
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height2p := graphics.NextPowerOf2Int(height)
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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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geo16 := floatsToInt16s(geo.Element(0, 0),
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geo.Element(0, 1),
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geo.Element(1, 0),
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@ -71,7 +77,10 @@ func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
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if sx0 == sx1 || sy0 == sy1 {
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continue
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}
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u0, v0, u1, v1 := u(sx0, width2p), v(sy0, height2p), u(sx1, width2p), v(sy1, height2p)
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u0 := int16((math.MaxInt16 * sx0) >> w)
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v0 := int16((math.MaxInt16 * sy0) >> h)
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u1 := int16((math.MaxInt16 * sx1) >> w)
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v1 := int16((math.MaxInt16 * sy1) >> h)
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offset := n * totalSize
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vs[offset] = x0
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vs[offset+1] = y0
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@ -31,8 +31,14 @@ func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
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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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w2p := graphics.NextPowerOf2Int(width)
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h2p := graphics.NextPowerOf2Int(height)
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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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@ -49,10 +55,10 @@ func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
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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 / w2p
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v0 := math.MaxInt16 * sy0 / h2p
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u1 := math.MaxInt16 * sx1 / w2p
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v1 := math.MaxInt16 * sy1 / h2p
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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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