mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
492149c463
This reverts commit 74f1e5519f.
Reason: The vertex slice is used at restorable package without
copying.
126 lines
2.3 KiB
Go
126 lines
2.3 KiB
Go
// 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)
|
|
}
|
|
|
|
func quadVertices(sx0, sy0, sx1, sy1 int, a, b, c, d, tx, ty float32, cr, cg, cb, ca float32) []float32 {
|
|
x := float32(sx1 - sx0)
|
|
y := float32(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)
|
|
|
|
// This function is very performance-sensitive and implement in a very dumb way.
|
|
vs := vertexSlice(4)
|
|
_ = vs[:48]
|
|
|
|
// For each values, see the comment at shareable.(*Image).DrawTriangles.
|
|
vs[0] = tx
|
|
vs[1] = ty
|
|
vs[2] = u0
|
|
vs[3] = v0
|
|
vs[4] = u0
|
|
vs[5] = v0
|
|
vs[6] = u1
|
|
vs[7] = v1
|
|
vs[8] = cr
|
|
vs[9] = cg
|
|
vs[10] = cb
|
|
vs[11] = ca
|
|
|
|
vs[12] = ax + tx
|
|
vs[13] = cx + ty
|
|
vs[14] = u1
|
|
vs[15] = v0
|
|
vs[16] = u0
|
|
vs[17] = v0
|
|
vs[18] = u1
|
|
vs[19] = v1
|
|
vs[20] = cr
|
|
vs[21] = cg
|
|
vs[22] = cb
|
|
vs[23] = ca
|
|
|
|
vs[24] = by + tx
|
|
vs[25] = dy + ty
|
|
vs[26] = u0
|
|
vs[27] = v1
|
|
vs[28] = u0
|
|
vs[29] = v0
|
|
vs[30] = u1
|
|
vs[31] = v1
|
|
vs[32] = cr
|
|
vs[33] = cg
|
|
vs[34] = cb
|
|
vs[35] = ca
|
|
|
|
vs[36] = ax + by + tx
|
|
vs[37] = cx + dy + ty
|
|
vs[38] = u1
|
|
vs[39] = v1
|
|
vs[40] = u0
|
|
vs[41] = v0
|
|
vs[42] = u1
|
|
vs[43] = v1
|
|
vs[44] = cr
|
|
vs[45] = cg
|
|
vs[46] = cb
|
|
vs[47] = ca
|
|
|
|
return vs
|
|
}
|