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https://github.com/hajimehoshi/ebiten.git
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f3cdb0537b
Now restorable/sharable packages cannot use the same vertices backend, but I think this won't affect the performance significantly.
60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
// Copyright 2019 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ebiten
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import (
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"sync"
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"github.com/hajimehoshi/ebiten/internal/graphics"
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)
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var (
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theVerticesBackend = &verticesBackend{}
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)
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type verticesBackend struct {
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backend []float32
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head int
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m sync.Mutex
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}
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func (v *verticesBackend) slice(n int) []float32 {
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v.m.Lock()
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need := n * graphics.VertexFloatNum
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if v.head+need > len(v.backend) {
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v.backend = nil
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v.head = 0
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}
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if v.backend == nil {
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l := 1024
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if n > l {
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l = n
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}
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v.backend = make([]float32, graphics.VertexFloatNum*l)
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}
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s := v.backend[v.head : v.head+need]
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v.head += need
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v.m.Unlock()
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return s
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}
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func vertexSlice(n int) []float32 {
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return theVerticesBackend.slice(n)
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}
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