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graphicsutil: Reduce multiplying

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This commit is contained in:
Hajime Hoshi 2018-06-17 20:11:31 +09:00
parent ac24a8382f
commit 12287a8382
1 changed files with 8 additions and 6 deletions
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14
internal/graphicsutil/vertices.go
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@ -75,6 +75,8 @@ func quadVerticesImpl(x, y, u0, v0, u1, v1 float32, geom GeoM) []float32 {
vs := theVerticesBackend.sliceForOneQuad() vs := theVerticesBackend.sliceForOneQuad()
a, b, c, d, tx, ty := geom.Elements() a, b, c, d, tx, ty := geom.Elements()
ax, by, cx, dy := a*x, b*y, c*x, d*y
// Vertex coordinates // Vertex coordinates
vs[0] = tx vs[0] = tx
vs[1] = ty vs[1] = ty
@ -88,22 +90,22 @@ func quadVerticesImpl(x, y, u0, v0, u1, v1 float32, geom GeoM) []float32 {
vs[5] = v1 vs[5] = v1
// and the same for the other three coordinates // and the same for the other three coordinates
vs[6] = a*x + tx vs[6] = ax + tx
vs[7] = c*x + ty vs[7] = cx + ty
vs[8] = u1 vs[8] = u1
vs[9] = v0 vs[9] = v0
vs[10] = u0 vs[10] = u0
vs[11] = v1 vs[11] = v1
vs[12] = b*y + tx vs[12] = by + tx
vs[13] = d*y + ty vs[13] = dy + ty
vs[14] = u0 vs[14] = u0
vs[15] = v1 vs[15] = v1
vs[16] = u1 vs[16] = u1
vs[17] = v0 vs[17] = v0
vs[18] = a*x + b*y + tx vs[18] = ax + by + tx
vs[19] = c*x + d*y + ty vs[19] = cx + dy + ty
vs[20] = u1 vs[20] = u1
vs[21] = v1 vs[21] = v1
vs[22] = u0 vs[22] = u0