mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 21:17:27 +01:00
331 lines
6.9 KiB
Go
331 lines
6.9 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 affine_test
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import (
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"math"
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"math/rand"
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"testing"
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"github.com/hajimehoshi/ebiten/v2/internal/affine"
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)
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func TestColorMScale(t *testing.T) {
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cases := []struct {
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In affine.ColorM
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Out affine.ColorM
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}{
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{
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affine.ColorMIdentity{},
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affine.ColorMIdentity{}.Scale(0.25, 0.5, 0.75, 1),
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},
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{
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affine.ColorMIdentity{}.Scale(0.5, 0.5, 0.5, 0.8),
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affine.ColorMIdentity{}.Scale(0.125, 0.25, 0.375, 0.8),
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},
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{
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affine.ColorMIdentity{}.Translate(0, 0, 0, 0),
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affine.ColorMIdentity{}.Scale(0.25, 0.5, 0.75, 1),
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},
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}
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for _, c := range cases {
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got := c.In.Scale(0.25, 0.5, 0.75, 1)
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want := c.Out
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if !got.Equals(want) {
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t.Errorf("%v.Scale(): got: %v, want: %v", c.In, got, want)
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}
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}
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}
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func TestColorMScaleOnly(t *testing.T) {
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cases := []struct {
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In affine.ColorM
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Out bool
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}{
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{
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affine.ColorMIdentity{},
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true,
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},
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{
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affine.ColorMIdentity{}.Translate(0, 0, 0, 0),
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true,
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},
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{
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affine.ColorMIdentity{}.Translate(1, 0, 0, 0),
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false,
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},
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{
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affine.ColorMIdentity{}.Translate(0, 0, 0, -1),
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false,
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},
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{
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affine.ColorMIdentity{}.Scale(1, 1, 1, 1),
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true,
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},
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{
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affine.ColorMIdentity{}.Scale(0, 0, 0, 0),
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true,
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},
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{
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affine.ColorMIdentity{}.Scale(0.1, 0.2, 0.3, 0.4),
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true,
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},
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{
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affine.ColorMIdentity{}.Scale(0.1, 0.2, 0.3, 0.4).Translate(1, 0, 0, 0),
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false,
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},
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{
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affine.ChangeHSV(affine.ColorMIdentity{}, math.Pi/2, 0.5, 0.5),
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false,
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},
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{
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affine.ColorMSetElement(affine.ColorMIdentity{}, 0, 0, 2),
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true,
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},
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{
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affine.ColorMSetElement(affine.ColorMIdentity{}, 0, 1, 2),
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false,
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},
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}
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for _, c := range cases {
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got := c.In.ScaleOnly()
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want := c.Out
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if got != want {
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t.Errorf("%v.ScaleOnly(): got: %t, want: %t", c.In, got, want)
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}
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}
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}
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func TestColorMIsInvertible(t *testing.T) {
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var m affine.ColorM = affine.ColorMIdentity{}
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m = affine.ColorMSetElement(m, 1, 0, .5)
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m = affine.ColorMSetElement(m, 1, 1, .5)
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m = affine.ColorMSetElement(m, 1, 2, .5)
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m = affine.ColorMSetElement(m, 1, 3, .5)
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m = affine.ColorMSetElement(m, 1, 4, .5)
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var cidentity affine.ColorM = affine.ColorMIdentity{}
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var cinvalid affine.ColorM = affine.ColorMIdentity{}
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cinvalid = affine.ColorMSetElement(cinvalid, 0, 0, 0)
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cinvalid = affine.ColorMSetElement(cinvalid, 1, 1, 0)
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cinvalid = affine.ColorMSetElement(cinvalid, 2, 2, 0)
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cinvalid = affine.ColorMSetElement(cinvalid, 3, 3, 0)
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cases := []struct {
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In affine.ColorM
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Out bool
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}{
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{
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cidentity,
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true,
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},
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{
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m,
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true,
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},
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{
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cinvalid,
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false,
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},
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}
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for _, c := range cases {
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got := c.In.IsInvertible()
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want := c.Out
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if got != want {
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t.Errorf("%s.IsInvertible(): got: %t, want: %t", c.In, got, want)
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}
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}
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}
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func arrayToColorM(es [4][5]float32) affine.ColorM {
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var a affine.ColorM = affine.ColorMIdentity{}
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for j := 0; j < 5; j++ {
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for i := 0; i < 4; i++ {
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a = affine.ColorMSetElement(a, i, j, es[i][j])
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}
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}
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return a
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}
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func abs(x float32) float32 {
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if x < 0 {
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return -x
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}
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return x
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}
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func equalWithDelta(a, b affine.ColorM, delta float32) bool {
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for j := 0; j < 5; j++ {
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for i := 0; i < 4; i++ {
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ea := a.At(i, j)
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eb := b.At(i, j)
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if abs(ea-eb) > delta {
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return false
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}
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}
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}
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return true
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}
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func TestColorMInvert(t *testing.T) {
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cases := []struct {
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In affine.ColorM
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Out affine.ColorM
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}{
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{
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In: affine.ColorMIdentity{},
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Out: affine.ColorMIdentity{},
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},
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{
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In: arrayToColorM([4][5]float32{
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{1, 0, 0, 0, 0},
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{0, 1, 0, 0, 0},
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{0, 0, 1, 0, 0},
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{0, 0, 0, 1, 0},
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}),
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Out: arrayToColorM([4][5]float32{
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{1, 0, 0, 0, 0},
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{0, 1, 0, 0, 0},
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{0, 0, 1, 0, 0},
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{0, 0, 0, 1, 0},
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}),
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},
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{
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In: affine.ColorMIdentity{}.Scale(1, 2, 4, 8),
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Out: arrayToColorM([4][5]float32{
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{1, 0, 0, 0, 0},
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{0, 0.5, 0, 0, 0},
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{0, 0, 0.25, 0, 0},
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{0, 0, 0, 0.125, 0},
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}),
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},
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{
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In: arrayToColorM([4][5]float32{
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{1, 0, 0, 0, 0},
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{8, 1, 0, 0, 0},
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{-9, 0, 1, 0, 0},
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{7, 4, 2, 1, 0},
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}),
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Out: arrayToColorM([4][5]float32{
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{1, 0, 0, 0, 0},
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{-8, 1, 0, 0, 0},
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{9, 0, 1, 0, 0},
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{7, -4, -2, 1, 0},
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}),
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},
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{
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In: arrayToColorM([4][5]float32{
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{1, 2, 3, 4, 5},
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{5, 1, 2, 3, 4},
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{4, 5, 1, 2, 3},
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{3, 4, 5, 1, 2},
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}),
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Out: arrayToColorM([4][5]float32{
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{-6 / 35.0, 3 / 14.0, 1 / 70.0, 1 / 70.0, -1 / 14.0},
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{1 / 35.0, -13 / 70.0, 3 / 14.0, 1 / 70.0, -1 / 14.0},
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{1 / 35.0, 1 / 70.0, -13 / 70.0, 3 / 14.0, -1 / 14.0},
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{9 / 35.0, 1 / 35.0, 1 / 35.0, -6 / 35.0, -8 / 7.0},
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}),
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},
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}
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for _, c := range cases {
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if got, want := c.In.Invert(), c.Out; !equalWithDelta(got, want, 1e-6) {
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t.Errorf("got: %v, want: %v", got, want)
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}
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}
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}
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func BenchmarkColorMInvert(b *testing.B) {
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r := rand.Float32
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b.StopTimer()
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var m affine.ColorM = affine.ColorMIdentity{}
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for m.IsIdentity() || !m.IsInvertible() {
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m = arrayToColorM([4][5]float32{
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{r(), r(), r(), r(), r() * 10},
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{r(), r(), r(), r(), r() * 10},
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{r(), r(), r(), r(), r() * 10},
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{r(), r(), r(), r(), r() * 10},
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})
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}
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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m = m.Invert()
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}
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}
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func TestColorMConcat(t *testing.T) {
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cases := []struct {
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In0 affine.ColorM
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In1 affine.ColorM
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Out affine.ColorM
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}{
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{
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affine.ColorMIdentity{},
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affine.ColorMIdentity{},
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affine.ColorMIdentity{},
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},
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{
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affine.ColorMIdentity{}.Scale(1, 2, 3, 4),
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affine.ColorMIdentity{}.Scale(5, 6, 7, 8),
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affine.ColorMIdentity{}.Scale(5, 12, 21, 32),
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},
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{
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affine.ColorMIdentity{}.Scale(5, 6, 7, 8),
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affine.ColorMIdentity{}.Scale(1, 2, 3, 4),
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affine.ColorMIdentity{}.Scale(5, 12, 21, 32),
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},
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{
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arrayToColorM([4][5]float32{
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{1, 2, 3, 4, 5},
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{5, 1, 2, 3, 4},
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{4, 5, 1, 2, 3},
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{3, 4, 5, 1, 2},
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}),
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affine.ColorMIdentity{}.Scale(1, 2, 3, 4),
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arrayToColorM([4][5]float32{
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{1, 2, 3, 4, 5},
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{10, 2, 4, 6, 8},
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{12, 15, 3, 6, 9},
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{12, 16, 20, 4, 8},
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}),
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},
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{
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affine.ColorMIdentity{}.Scale(1, 2, 3, 4),
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arrayToColorM([4][5]float32{
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{1, 2, 3, 4, 5},
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{5, 1, 2, 3, 4},
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{4, 5, 1, 2, 3},
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{3, 4, 5, 1, 2},
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}),
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arrayToColorM([4][5]float32{
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{1, 4, 9, 16, 5},
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{5, 2, 6, 12, 4},
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{4, 10, 3, 8, 3},
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{3, 8, 15, 4, 2},
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}),
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},
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}
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for _, c := range cases {
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got := c.In0.Concat(c.In1)
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want := c.Out
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if !equalWithDelta(got, want, 1e-6) {
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t.Errorf("%s.Concat(%s): got: %v, want: %v", c.In0, c.In1, got, want)
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}
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}
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}
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