ebiten/internal/packing/packing_test.go

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// Copyright 2018 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.
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package packing_test
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import (
"testing"
"github.com/hajimehoshi/ebiten/v2/internal/packing"
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)
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func TestPage(t *testing.T) {
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type Rect struct {
X int
Y int
Width int
Height int
}
type Op struct {
Width int
Height int
FreeNodeID int
}
cases := []struct {
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Name string
In []Op
Out []*Rect
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}{
{
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Name: "alloc and random free",
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In: []Op{
{100, 100, -1},
{100, 100, -1},
{100, 100, -1},
{100, 100, -1},
{100, 100, -1},
{100, 100, -1},
{0, 0, 1},
{0, 0, 3},
{0, 0, 5},
{0, 0, 0},
{0, 0, 2},
{0, 0, 4},
{1024, 1024, -1},
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},
Out: []*Rect{
{0, 0, 100, 100},
{0, 100, 100, 100},
{0, 200, 100, 100},
{0, 300, 100, 100},
{0, 400, 100, 100},
{0, 500, 100, 100},
nil,
nil,
nil,
nil,
nil,
nil,
{0, 0, 1024, 1024},
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},
},
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{
Name: "alloc and free and empty",
In: []Op{
{31, 41, -1},
{59, 26, -1},
{53, 58, -1},
{97, 93, -1},
{28, 84, -1},
{62, 64, -1},
{0, 0, 0},
{0, 0, 1},
{0, 0, 2},
{0, 0, 3},
{0, 0, 4},
{0, 0, 5},
},
Out: []*Rect{
{0, 0, 31, 41},
{31, 0, 59, 26},
{31, 26, 53, 58},
{31, 84, 97, 93},
{0, 41, 28, 84},
{31, 177, 62, 64},
nil,
nil,
nil,
nil,
nil,
nil,
},
},
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{
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Name: "random Alloc",
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In: []Op{
{100, 200, -1},
{1024, 1024, -1},
{100, 200, -1},
{50, 50, -1},
{200, 200, -1},
{1024, 1024, -1},
{500, 500, -1},
{600, 600, -1},
{100, 100, -1},
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{0, 0, 2},
{100, 200, -1},
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},
Out: []*Rect{
{0, 0, 100, 200},
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nil,
{0, 200, 100, 200},
{0, 400, 50, 50},
{100, 0, 200, 200},
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nil,
{100, 200, 500, 500},
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nil,
{0, 450, 100, 100},
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nil,
{0, 200, 100, 200},
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},
},
{
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Name: "fill squares",
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In: []Op{
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
{256, 256, -1},
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},
Out: []*Rect{
{0, 0, 256, 256},
{0, 256, 256, 256},
{0, 512, 256, 256},
{0, 768, 256, 256},
{256, 0, 256, 256},
{512, 0, 256, 256},
{768, 0, 256, 256},
{256, 256, 256, 256},
{256, 512, 256, 256},
{256, 768, 256, 256},
{512, 256, 256, 256},
{768, 256, 256, 256},
{512, 512, 256, 256},
{512, 768, 256, 256},
{768, 512, 256, 256},
{768, 768, 256, 256},
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nil,
},
},
{
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Name: "fill not fitting squares",
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In: []Op{
{300, 300, -1},
{300, 300, -1},
{300, 300, -1},
{300, 300, -1},
{300, 300, -1},
{300, 300, -1},
{300, 300, -1},
{300, 300, -1},
{300, 300, -1},
{300, 300, -1},
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},
Out: []*Rect{
{0, 0, 300, 300},
{0, 300, 300, 300},
{0, 600, 300, 300},
{300, 0, 300, 300},
{600, 0, 300, 300},
{300, 300, 300, 300},
{300, 600, 300, 300},
{600, 300, 300, 300},
{600, 600, 300, 300},
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nil,
},
},
}
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for _, c := range cases {
p := packing.NewPage(1024, 1024)
nodes := []*packing.Node{}
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nnodes := 0
for i, in := range c.In {
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if in.FreeNodeID == -1 {
n := p.Alloc(in.Width, in.Height)
nodes = append(nodes, n)
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nnodes++
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} else {
p.Free(nodes[in.FreeNodeID])
nodes = append(nodes, nil)
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nnodes--
}
if nnodes < 0 {
panic("not reached")
}
if p.IsEmpty() != (nnodes == 0) {
t.Errorf("%s: nodes[%d]: page.IsEmpty(): got: %v, want: %v", c.Name, i, p.IsEmpty(), (nnodes == 0))
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}
}
for i, out := range c.Out {
if nodes[i] == nil {
if out != nil {
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t.Errorf("%s: nodes[%d]: should be nil but %v", c.Name, i, out)
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}
continue
}
x, y, width, height := nodes[i].Region()
got := Rect{x, y, width, height}
if out == nil {
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t.Errorf("%s: nodes[%d]: got: %v, want: %v", c.Name, i, got, nil)
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continue
}
want := *out
if got != want {
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t.Errorf("%s: nodes[%d]: got: %v, want: %v", c.Name, i, got, want)
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}
}
}
}
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func TestAlloc(t *testing.T) {
p := packing.NewPage(1024, 2048)
w, h := p.Size()
p.Alloc(w/2, h/2)
n0 := p.Alloc(w*3/2, h*2)
if n0 == nil {
t.Errorf("p.Alloc failed: width: %d, height: %d", w*3/2, h*2)
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}
n1 := p.Alloc(w/2, h*3/2)
if n1 == nil {
t.Errorf("p.Alloc failed: width: %d, height: %d", w/2, h*3/2)
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}
if p.Alloc(1, 1) != nil {
t.Errorf("p.Alloc(1, 1) must fail but not")
}
p.Free(n1)
if p.Alloc(1, 1) == nil {
t.Errorf("p.Alloc(1, 1) failed")
}
p.Free(n0)
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}
func TestAlloc2(t *testing.T) {
p := packing.NewPage(1024, 2048)
w, h := p.Size()
p.Alloc(w/2, h/2)
n1 := p.Alloc(w/2, h/2)
n2 := p.Alloc(w/2, h/2)
p.Alloc(w/2, h/2)
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p.Free(n1)
p.Free(n2)
n3 := p.Alloc(w, h*2)
if n3 == nil {
t.Errorf("p.Alloc failed: width: %d, height: %d", w, h*2)
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}
n4 := p.Alloc(w, h)
if n4 == nil {
t.Errorf("p.Alloc failed: width: %d, height: %d", w, h)
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}
p.Free(n4)
p.Free(n3)
}
func TestAllocJustSize(t *testing.T) {
p := packing.NewPage(1024, 4096)
if p.Alloc(4096, 4096) == nil {
t.Errorf("got: nil, want: non-nil")
}
}
// Issue #1454
func TestAllocTooMuch(t *testing.T) {
p := packing.NewPage(1024, 4096)
p.Alloc(1, 1)
if p.Alloc(4096, 4096) != nil {
t.Errorf("got: non-nil, want: nil")
}
}
func TestNonSquareAlloc(t *testing.T) {
p := packing.NewPage(1024, 16384)
n0 := p.Alloc(16384, 1)
if _, h := p.Size(); h != 1024 {
t.Errorf("got: %d, want: 1024", h)
}
n1 := p.Alloc(16384, 1)
if _, h := p.Size(); h != 1024 {
t.Errorf("got: %d, want: 1024", h)
}
p.Free(n0)
p.Free(n1)
}
func TestExtend(t *testing.T) {
p := packing.NewPage(1024, 2048)
n0 := p.Alloc(1024, 1024)
if n0 == nil {
t.Errorf("p.Alloc(1024, 1024) failed")
}
// In the current implementation, the page is extended in a horizontal direction first.
n1 := p.Alloc(1024, 1024)
if n1 == nil {
t.Errorf("p.Alloc(1024, 1024) failed")
}
gotWidth, gotHeight := p.Size()
if wantWidth, wantHeight := 2048, 1024; gotWidth != wantWidth || gotHeight != wantHeight {
t.Errorf("got: (%d, %d), want: (%d, %d)", gotWidth, gotHeight, wantWidth, wantHeight)
}
// Then, allocating (1024, 2048) fails unfortunately.
if p.Alloc(1024, 2048) != nil {
t.Errorf("p.Alloc(1024, 2048) must fail but not")
}
n2 := p.Alloc(2048, 1024)
if n2 == nil {
t.Errorf("p.Alloc(1024, 2048) failed")
}
gotWidth, gotHeight = p.Size()
if wantWidth, wantHeight := 2048, 2048; gotWidth != wantWidth || gotHeight != wantHeight {
t.Errorf("got: (%d, %d), want: (%d, %d)", gotWidth, gotHeight, wantWidth, wantHeight)
}
p.Free(n0)
p.Free(n1)
p.Free(n2)
}
func TestExtend2(t *testing.T) {
p := packing.NewPage(1024, 2048)
n0 := p.Alloc(1024, 1024)
if n0 == nil {
t.Errorf("p.Alloc(1024, 1024) failed")
}
// Extend the page in the both directions. (1024, 2048) should be allocated on the right side.
n1 := p.Alloc(1024, 2048)
if n1 == nil {
t.Errorf("p.Alloc(1024, 2048) failed")
}
gotWidth, gotHeight := p.Size()
if wantWidth, wantHeight := 2048, 2048; gotWidth != wantWidth || gotHeight != wantHeight {
t.Errorf("got: (%d, %d), want: (%d, %d)", gotWidth, gotHeight, wantWidth, wantHeight)
}
// There should be a space in the lower-left corner.
n2 := p.Alloc(1024, 1024)
if n2 == nil {
t.Errorf("p.Alloc(1024, 1024) failed")
}
gotWidth, gotHeight = p.Size()
if wantWidth, wantHeight := 2048, 2048; gotWidth != wantWidth || gotHeight != wantHeight {
t.Errorf("got: (%d, %d), want: (%d, %d)", gotWidth, gotHeight, wantWidth, wantHeight)
}
p.Free(n0)
p.Free(n1)
p.Free(n2)
}
func TestExtend3(t *testing.T) {
p := packing.NewPage(1024, 2048)
// Allocate a small area that doesn't touch the left edge and the bottom edge.
// Allocating (1, 1) would split the entire region into left and right in the current implementation,
// so allocate (2, 1) here.
n0 := p.Alloc(2, 1)
if n0 == nil {
t.Errorf("p.Alloc(1, 1) failed")
}
// Extend the page in the vertical direction.
n1 := p.Alloc(1024, 2047)
if n1 == nil {
t.Errorf("p.Alloc(1024, 2047) failed")
}
gotWidth, gotHeight := p.Size()
if wantWidth, wantHeight := 1024, 2048; gotWidth != wantWidth || gotHeight != wantHeight {
t.Errorf("got: (%d, %d), want: (%d, %d)", gotWidth, gotHeight, wantWidth, wantHeight)
}
// There should be a space on the right side.
n2 := p.Alloc(1024, 2048)
if n2 == nil {
t.Errorf("p.Alloc(1024, 2048) failed")
}
gotWidth, gotHeight = p.Size()
if wantWidth, wantHeight := 2048, 2048; gotWidth != wantWidth || gotHeight != wantHeight {
t.Errorf("got: (%d, %d), want: (%d, %d)", gotWidth, gotHeight, wantWidth, wantHeight)
}
p.Free(n0)
p.Free(n1)
p.Free(n2)
}