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internal/graphics: Refactoring

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This commit is contained in:
Hajime Hoshi 2021-03-20 20:14:00 +09:00
parent 26b9fa20c1
commit 15a0c53918
1 changed files with 4 additions and 1 deletions
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5
internal/graphics/vertex.go
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@ -63,6 +63,9 @@ type verticesBackend struct {
m sync.Mutex m sync.Mutex
} }
// slice returns a float32 slice for n vertices.
// slice returns a slice that never overlaps with other slices returned this function,
// and users can do optimization based on this fact.
func (v *verticesBackend) slice(n int) []float32 { func (v *verticesBackend) slice(n int) []float32 {
v.m.Lock() v.m.Lock()
defer v.m.Unlock() defer v.m.Unlock()
@ -95,7 +98,7 @@ func QuadVertices(sx0, sy0, sx1, sy1 float32, a, b, c, d, tx, ty float32, cr, cg
vs := theVerticesBackend.slice(4) vs := theVerticesBackend.slice(4)
// This function is very performance-sensitive and implement in a very dumb way. // This function is very performance-sensitive and implement in a very dumb way.
_ = vs[:32] _ = vs[:4*VertexFloatNum]
vs[0] = tx vs[0] = tx
vs[1] = ty vs[1] = ty