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internal/graphics: Always use the vertex backend to reduce GC

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Closes #1521
This commit is contained in:
Hajime Hoshi 2021-03-03 22:23:13 +09:00
parent c3ddc2089a
commit c8b98f13fb
1 changed files with 3 additions and 13 deletions
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16
internal/graphics/vertex.go
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@ -14,10 +14,6 @@
package graphics
import (
"github.com/hajimehoshi/ebiten/v2/internal/web"
)
const (
ShaderImageNum = 4
@ -86,22 +82,16 @@ func (v *verticesBackend) slice(n int, last bool) []float32 {
return s
}
func vertexSlice(n int, last bool) []float32 {
if web.IsBrowser() {
// In Wasm, allocating memory by make is expensive. Use the backend instead.
return theVerticesBackend.slice(n, last)
}
return make([]float32, n*VertexFloatNum)
}
func QuadVertices(sx0, sy0, sx1, sy1 float32, a, b, c, d, tx, ty float32, cr, cg, cb, ca float32, last bool) []float32 {
x := sx1 - sx0
y := sy1 - sy0
ax, by, cx, dy := a*x, b*y, c*x, d*y
u0, v0, u1, v1 := float32(sx0), float32(sy0), float32(sx1), float32(sy1)
// Use the vertex backend instead of calling make to reduce GCs (#1521).
vs := theVerticesBackend.slice(4, last)
// This function is very performance-sensitive and implement in a very dumb way.
vs := vertexSlice(4, last)
_ = vs[:32]
vs[0] = tx