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https://github.com/hajimehoshi/ebiten.git
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internal/affine: Add coloMImpl interface and colorMImplScale
Closes #1658
This commit is contained in:
Hajime Hoshi
parent
7e5b259dd2
commit
5f03f4f195
@ -45,7 +45,21 @@ var (
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//
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// The nil and initial value is identity.
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type ColorM struct {
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impl *colorMImplBodyTranslate
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impl colorMImpl
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}
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type colorMImpl interface {
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IsIdentity() bool
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ScaleOnly() bool
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UnsafeScaleElements() *[4]float32
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UnsafeElements() (*[16]float32, *[4]float32)
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Apply(r, g, b, a float32) color.Color
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IsInvertible() bool
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Invert() *ColorM
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Equals(other *ColorM) bool
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Concat(other *ColorM) *ColorM
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Scale(r, g, b, a float32) *ColorM
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Translate(r, g, b, a float32) *ColorM
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}
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func (c *ColorM) String() string {
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@ -57,6 +71,10 @@ func (c *ColorM) String() string {
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b[3], b[7], b[11], b[15], t[3])
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}
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type colorMImplScale struct {
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scale [4]float32
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}
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type colorMImplBodyTranslate struct {
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body [16]float32
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translate [4]float32
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@ -82,6 +100,10 @@ func (c *ColorM) isIdentity() bool {
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return c.impl.IsIdentity()
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}
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func (c *colorMImplScale) IsIdentity() bool {
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return c.scale == [4]float32{1, 1, 1, 1}
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}
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func (c *colorMImplBodyTranslate) IsIdentity() bool {
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return c.body == colorMIdentityBody && c.translate == colorMIdentityTranslate
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}
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@ -93,6 +115,10 @@ func (c *ColorM) ScaleOnly() bool {
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return c.impl.ScaleOnly()
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}
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func (c *colorMImplScale) ScaleOnly() bool {
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return true
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}
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func (c *colorMImplBodyTranslate) ScaleOnly() bool {
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if c.body[1] != 0 {
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return false
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@ -138,14 +164,19 @@ func (c *colorMImplBodyTranslate) ScaleOnly() bool {
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return true
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}
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func (c *colorMImplScale) UnsafeScaleElements() *[4]float32 {
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return &c.scale
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}
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func (c *colorMImplBodyTranslate) UnsafeScaleElements() *[4]float32 {
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return &[...]float32{c.body[0], c.body[5], c.body[10], c.body[15]}
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}
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func (c *ColorM) Apply(clr color.Color) color.Color {
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if c.isIdentity() {
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return clr
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}
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return c.impl.Apply(clr)
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}
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func (c *colorMImplBodyTranslate) Apply(clr color.Color) color.Color {
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r, g, b, a := clr.RGBA()
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rf, gf, bf, af := float32(0.0), float32(0.0), float32(0.0), float32(0.0)
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// Unmultiply alpha
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@ -155,6 +186,27 @@ func (c *colorMImplBodyTranslate) Apply(clr color.Color) color.Color {
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bf = float32(b) / float32(a)
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af = float32(a) / 0xffff
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}
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return c.impl.Apply(rf, gf, bf, af)
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}
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func (c *colorMImplScale) Apply(rf, gf, bf, af float32) color.Color {
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rf *= c.scale[0]
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gf *= c.scale[1]
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bf *= c.scale[2]
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af *= c.scale[3]
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rf = clamp(rf)
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gf = clamp(gf)
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bf = clamp(bf)
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af = clamp(af)
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return color.NRGBA64{
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R: uint16(rf * 0xffff),
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G: uint16(gf * 0xffff),
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B: uint16(bf * 0xffff),
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A: uint16(af * 0xffff),
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}
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}
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func (c *colorMImplBodyTranslate) Apply(rf, gf, bf, af float32) color.Color {
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eb := &c.body
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et := &c.translate
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rf2 := eb[0]*rf + eb[4]*gf + eb[8]*bf + eb[12]*af + et[0]
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@ -180,15 +232,17 @@ func (c *ColorM) UnsafeElements() (*[16]float32, *[4]float32) {
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return c.impl.UnsafeElements()
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}
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func (c *colorMImplBodyTranslate) UnsafeElements() (*[16]float32, *[4]float32) {
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return &c.body, &c.translate
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func (c *colorMImplScale) UnsafeElements() (*[16]float32, *[4]float32) {
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return &[...]float32{
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c.scale[0], 0, 0, 0,
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0, c.scale[1], 0, 0,
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0, 0, c.scale[2], 0,
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0, 0, 0, c.scale[3],
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}, &colorMIdentityTranslate
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}
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func (c *ColorM) det() float32 {
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if c.isIdentity() {
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return 1
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}
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return c.impl.det()
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func (c *colorMImplBodyTranslate) UnsafeElements() (*[16]float32, *[4]float32) {
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return &c.body, &c.translate
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}
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func (c *colorMImplBodyTranslate) det() float32 {
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@ -225,6 +279,17 @@ func (c *colorMImplBodyTranslate) det() float32 {
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// IsInvertible returns a boolean value indicating
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// whether the matrix c is invertible or not.
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func (c *ColorM) IsInvertible() bool {
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if c.isIdentity() {
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return true
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}
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return c.impl.IsInvertible()
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}
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func (c *colorMImplScale) IsInvertible() bool {
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return c.scale[0] != 0 && c.scale[1] != 0 && c.scale[2] != 0 && c.scale[3] != 0
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}
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func (c *colorMImplBodyTranslate) IsInvertible() bool {
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return c.det() != 0
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}
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@ -237,6 +302,19 @@ func (c *ColorM) Invert() *ColorM {
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return c.impl.Invert()
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}
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func (c *colorMImplScale) Invert() *ColorM {
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return &ColorM{
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impl: &colorMImplScale{
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scale: [4]float32{
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1 / c.scale[0],
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1 / c.scale[1],
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1 / c.scale[2],
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1 / c.scale[3],
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},
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},
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}
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}
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func (c *colorMImplBodyTranslate) Invert() *ColorM {
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det := c.det()
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if det == 0 {
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@ -359,7 +437,9 @@ func (c *ColorM) SetElement(i, j int, element float32) *ColorM {
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body: colorMIdentityBody,
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}
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if !c.isIdentity() {
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*newImpl = *c.impl
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b, t := c.impl.UnsafeElements()
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newImpl.body = *b
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newImpl.translate = *t
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}
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if j < (ColorMDim - 1) {
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newImpl.body[i+j*(ColorMDim-1)] = element
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@ -381,9 +461,20 @@ func (c *ColorM) Equals(other *ColorM) bool {
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return c.impl.Equals(other)
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}
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func (c *colorMImplScale) Equals(other *ColorM) bool {
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if !other.impl.ScaleOnly() {
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return false
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}
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for i, s := range other.impl.UnsafeScaleElements() {
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if c.scale[i] != s {
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return false
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}
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}
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return true
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}
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func (c *colorMImplBodyTranslate) Equals(other *ColorM) bool {
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lhsb := &other.impl.body
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lhst := &other.impl.translate
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lhsb, lhst := other.impl.UnsafeElements()
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rhsb := &c.body
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rhst := &c.translate
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return *lhsb == *rhsb && *lhst == *rhst
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@ -401,9 +492,29 @@ func (c *ColorM) Concat(other *ColorM) *ColorM {
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return c.impl.Concat(other)
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}
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func (c *colorMImplScale) Concat(other *ColorM) *ColorM {
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if other.ScaleOnly() {
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s := other.impl.UnsafeScaleElements()
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return c.Scale(s[0], s[1], s[2], s[3])
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}
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lhsb, lhst := other.impl.UnsafeElements()
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s := &c.scale
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return &ColorM{
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impl: &colorMImplBodyTranslate{
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body: [...]float32{
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lhsb[0] * s[0], lhsb[1] * s[0], lhsb[2] * s[0], lhsb[3] * s[0],
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lhsb[4] * s[1], lhsb[5] * s[1], lhsb[6] * s[1], lhsb[7] * s[1],
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lhsb[8] * s[2], lhsb[9] * s[2], lhsb[10] * s[2], lhsb[11] * s[2],
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lhsb[12] * s[3], lhsb[13] * s[3], lhsb[14] * s[3], lhsb[15] * s[3],
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},
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translate: *lhst,
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},
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}
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}
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func (c *colorMImplBodyTranslate) Concat(other *ColorM) *ColorM {
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lhsb := &other.impl.body
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lhst := &other.impl.translate
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lhsb, lhst := other.impl.UnsafeElements()
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rhsb := &c.body
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rhst := &c.translate
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@ -428,11 +539,25 @@ func (c *ColorM) Scale(r, g, b, a float32) *ColorM {
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return getCachedScalingColorM(r, g, b, a)
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}
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if c.ScaleOnly() {
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return getCachedScalingColorM(r*c.impl.body[0], g*c.impl.body[5], b*c.impl.body[10], a*c.impl.body[15])
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s := c.impl.UnsafeScaleElements()
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return getCachedScalingColorM(r*s[0], g*s[1], b*s[2], a*s[3])
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}
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return c.impl.Scale(r, g, b, a)
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}
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func (c *colorMImplScale) Scale(r, g, b, a float32) *ColorM {
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return &ColorM{
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impl: &colorMImplScale{
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scale: [...]float32{
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c.scale[0] * r,
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c.scale[1] * g,
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c.scale[2] * b,
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c.scale[3] * a,
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},
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},
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}
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}
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func (c *colorMImplBodyTranslate) Scale(r, g, b, a float32) *ColorM {
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eb := c.body
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for i := 0; i < ColorMDim-1; i++ {
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@ -470,6 +595,20 @@ func (c *ColorM) Translate(r, g, b, a float32) *ColorM {
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return c.impl.Translate(r, g, b, a)
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}
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func (c *colorMImplScale) Translate(r, g, b, a float32) *ColorM {
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return &ColorM{
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impl: &colorMImplBodyTranslate{
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body: [...]float32{
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c.scale[0], 0, 0, 0,
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0, c.scale[1], 0, 0,
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0, 0, c.scale[2], 0,
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0, 0, 0, c.scale[3],
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},
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translate: [...]float32{r, g, b, a},
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},
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}
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}
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func (c *colorMImplBodyTranslate) Translate(r, g, b, a float32) *ColorM {
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es := c.translate
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es[0] += r
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@ -584,13 +723,8 @@ func getCachedScalingColorM(r, g, b, a float32) *ColorM {
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v := &cachedScalingColorMValue{
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c: &ColorM{
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impl: &colorMImplBodyTranslate{
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body: [...]float32{
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r, 0, 0, 0,
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0, g, 0, 0,
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0, 0, b, 0,
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0, 0, 0, a,
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},
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impl: &colorMImplScale{
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scale: [...]float32{r, g, b, a},
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},
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},
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atime: now,
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@ -192,6 +192,29 @@ func TestColorMInvert(t *testing.T) {
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In: nil,
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Out: nil,
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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: (*ColorM)(nil).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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@ -248,3 +271,64 @@ func BenchmarkColorMInvert(b *testing.B) {
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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 *ColorM
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In1 *ColorM
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Out *ColorM
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}{
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{
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nil,
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nil,
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nil,
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},
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{
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(*ColorM)(nil).Scale(1, 2, 3, 4),
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(*ColorM)(nil).Scale(5, 6, 7, 8),
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(*ColorM)(nil).Scale(5, 12, 21, 32),
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},
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{
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(*ColorM)(nil).Scale(5, 6, 7, 8),
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(*ColorM)(nil).Scale(1, 2, 3, 4),
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(*ColorM)(nil).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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(*ColorM)(nil).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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(*ColorM)(nil).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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