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// Copyright 2019 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ebiten
import (
"sync"
"github.com/hajimehoshi/ebiten/internal/graphics"
)
var (
theVerticesBackend = &verticesBackend{}
)
type verticesBackend struct {
backend []float32
head int
m sync.Mutex
}
func (v *verticesBackend) slice(n int) []float32 {
v.m.Lock()
need := n * graphics.VertexFloatNum
if v.head+need > len(v.backend) {
v.backend = nil
v.head = 0
}
if v.backend == nil {
l := 1024
if n > l {
l = n
}
v.backend = make([]float32, graphics.VertexFloatNum*l)
}
s := v.backend[v.head : v.head+need]
v.head += need
v.m.Unlock()
return s
}
func vertexSlice(n int) []float32 {
return theVerticesBackend.slice(n)
}
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