mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 19:28:57 +01:00
110 lines
2.6 KiB
Go
110 lines
2.6 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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"github.com/gopherjs/gopherjs/js"
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"github.com/hajimehoshi/ebiten/internal/affine"
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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 *affine.GeoM) []float32 {
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// TODO: This function should be in graphics package?
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totalSize := graphics.QuadVertexSizeInBytes() / 4
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l := parts.Len()
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vs := js.Global.Get("Float32Array").New(l * totalSize)
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g := geo.UnsafeElements()
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g0 := g[0]
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g1 := g[1]
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g2 := g[3]
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g3 := g[4]
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g4 := g[2]
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g5 := g[5]
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w := 1
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h := 1
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for w < width {
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w *= 2
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}
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for h < height {
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h *= 2
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}
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wf := float64(w)
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hf := float64(h)
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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, v0, u1, v1 := float64(sx0)/wf, float64(sy0)/hf, float64(sx1)/wf, float64(sy1)/hf
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// Adjust texels to fix a problem that outside texels are used (#317).
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u1 -= 1.0 / wf / 256.0
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v1 -= 1.0 / hf / 256.0
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vs.SetIndex(n, dx0)
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vs.SetIndex(n+1, dy0)
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vs.SetIndex(n+2, u0)
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vs.SetIndex(n+3, v0)
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vs.SetIndex(n+4, g0)
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vs.SetIndex(n+5, g1)
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vs.SetIndex(n+6, g2)
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vs.SetIndex(n+7, g3)
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vs.SetIndex(n+8, g4)
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vs.SetIndex(n+9, g5)
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vs.SetIndex(n+10, dx1)
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vs.SetIndex(n+11, dy0)
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vs.SetIndex(n+12, u1)
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vs.SetIndex(n+13, v0)
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vs.SetIndex(n+14, g0)
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vs.SetIndex(n+15, g1)
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vs.SetIndex(n+16, g2)
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vs.SetIndex(n+17, g3)
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vs.SetIndex(n+18, g4)
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vs.SetIndex(n+19, g5)
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vs.SetIndex(n+20, dx0)
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vs.SetIndex(n+21, dy1)
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vs.SetIndex(n+22, u0)
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vs.SetIndex(n+23, v1)
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vs.SetIndex(n+24, g0)
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vs.SetIndex(n+25, g1)
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vs.SetIndex(n+26, g2)
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vs.SetIndex(n+27, g3)
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vs.SetIndex(n+28, g4)
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vs.SetIndex(n+29, g5)
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vs.SetIndex(n+30, dx1)
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vs.SetIndex(n+31, dy1)
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vs.SetIndex(n+32, u1)
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vs.SetIndex(n+33, v1)
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vs.SetIndex(n+34, g0)
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vs.SetIndex(n+35, g1)
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vs.SetIndex(n+36, g2)
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vs.SetIndex(n+37, g3)
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vs.SetIndex(n+38, g4)
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vs.SetIndex(n+39, g5)
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n += totalSize
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}
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return vs.Interface().([]float32)
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}
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