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graphicsutil: Fix comments

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This commit is contained in:
Hajime Hoshi 2018-10-06 15:01:12 +09:00
parent cf2fa8873a
commit d08ae0dd66
1 changed files with 4 additions and 2 deletions
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6
internal/graphicsutil/vertices.go
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@ -147,8 +147,10 @@ func Vertex(width, height int, dx, dy, sx, sy float32, cr, cg, cb, ca float32) [
wf := float32(width)
hf := float32(height)
// Specifying a range explicitly here is redundant but this helps optimization
// to eliminate boundry checks.
// Specify -1 for the source region, which means the source region is ignored.
//
// NaN would make more sense to represent an invalid state, but vertices including NaN values doesn't work on
// some machines (#696). Let's use negative numbers to represent such state.
vs := theVerticesBackend.sliceForOneQuad()[0:10]
vs[0] = dx
vs[1] = dy