mirror of
https://github.com/ivanizag/izapple2.git
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Split of screen.go
This commit is contained in:
Ivan Izaguirre
parent
847dbbc8bf
commit
c8c5ab9fd6
367
apple2/screen.go
367
apple2/screen.go
@ -6,7 +6,6 @@ import (
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"image/color"
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"image/png"
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"os"
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"time"
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)
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/*
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@ -80,369 +79,3 @@ func linesSeparatedFilter(in *image.RGBA) *image.RGBA {
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}
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return out
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}
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func getNTSCColorMap() []color.Color {
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// RGB values from https://mrob.com/pub/xapple2/colors.html
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black := color.RGBA{0, 0, 0, 255} /*COLOR=0 */ /* 0 0 0*/
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dkBlue := color.RGBA{96, 78, 189, 255} /*COLOR=2 */ /* 0 60 25*/
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red := color.RGBA{227, 30, 96, 255} /*COLOR=1 */ /* 90 60 25*/
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brown := color.RGBA{96, 114, 3, 255} /*COLOR=8 */ /*180 60 25*/
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dkGreen := color.RGBA{0, 163, 96, 255} /*COLOR=4 */ /*270 60 25*/
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grey := color.RGBA{156, 156, 156, 255} /*COLOR=10*/ /* 0 0 50*/
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purple := color.RGBA{255, 68, 253, 255} /*HCOLOR=2*/ /* 45 100 50*/
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orange := color.RGBA{255, 106, 60, 255} /*HCOLOR=5*/ /*135 100 50*/
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green := color.RGBA{20, 245, 60, 255} /*HCOLOR=1*/ /*225 100 50*/
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blue := color.RGBA{20, 207, 253, 255} /*HCOLOR=6*/ /*315 100 50*/
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//purple := color.RGBA{255, 68, 253, 255} /*COLOR=3 */ /* 45 100 50*/
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//orange := color.RGBA{255, 106, 60, 255} /*COLOR=9 */ /*135 100 50*/
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//green := color.RGBA{20, 245, 60, 255} /*COLOR=12*/ /*225 100 50*/
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//blue := color.RGBA{20, 207, 253, 255} /*COLOR=6 */ /*315 100 50*/
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ltBlue := color.RGBA{208, 195, 255, 255} /*COLOR=7 */ /* 0 60 75*/
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pink := color.RGBA{255, 160, 208, 255} /*COLOR=11*/ /* 90 60 75*/
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yellow := color.RGBA{208, 221, 141, 255} /*COLOR=13*/ /*180 60 75*/
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aqua := color.RGBA{114, 255, 208, 255} /*COLOR=14*/ /*270 60 75*/
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white := color.RGBA{255, 255, 255, 255} /*COLOR=15*/ /* 0 0 100*/
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colorMap := []color.Color{
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/* 0000 */ black,
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/* 0001 */ brown,
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/* 0010 */ dkGreen,
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/* 0011 */ green,
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/* 0100 */ dkBlue,
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/* 0101 */ grey,
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/* 0110 */ blue,
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/* 0111 */ aqua,
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/* 1000 */ red,
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/* 1001 */ orange,
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/* 1010 */ grey,
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/* 1011 */ yellow,
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/* 1100 */ purple,
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/* 1101 */ pink,
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/* 1110 */ ltBlue,
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/* 1111 */ white,
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}
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return colorMap
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}
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func filterNTSCColorStatic(in *image.RGBA) *image.RGBA {
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colorMap := getNTSCColorMap()
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b := in.Bounds()
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size := image.Rect(0, 0, b.Dx()/4, b.Dy())
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out := image.NewRGBA(size)
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for y := b.Min.Y; y < b.Max.Y; y++ {
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for x := b.Min.X; x < b.Max.X; x += 4 {
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v := 0
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for i := 0; i < 4; i++ {
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cIn := in.At(x+i, y)
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r, _, _, _ := cIn.RGBA()
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v = v << 1
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if r != 0 {
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v++
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}
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}
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cOut := colorMap[v]
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out.Set(x/4, y, cOut)
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}
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}
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return out
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}
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func filterNTSCColorMoving(blacker bool, in *image.RGBA) *image.RGBA {
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colorMap := getNTSCColorMap()
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b := in.Bounds()
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size := image.Rect(0, 0, b.Dx()+3, b.Dy())
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out := image.NewRGBA(size)
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// We store the last four bits. We start will 0000
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v := 0
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for y := b.Min.Y; y < b.Max.Y; y++ {
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for x := b.Min.X; x < b.Dx(); x++ {
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cIn := in.At(x, y)
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r, _, _, _ := cIn.RGBA()
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pos := 1 << (3 - uint(x%4))
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var cOut color.Color
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if r != 0 {
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v |= pos
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cOut = colorMap[v]
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} else {
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v &^= pos
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if blacker {
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// If there is no luminance, let's have black anyway
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cOut = colorMap[0]
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} else {
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cOut = colorMap[v]
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}
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}
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out.Set(x, y, cOut)
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}
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// We fade for the last three positions
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for x := b.Dx(); x < b.Max.X; x++ {
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v = (v << 1) & 0xF
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cOut := colorMap[v]
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out.Set(x, y, cOut)
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}
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}
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return out
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}
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const (
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charWidth = 7
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charHeight = 8
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textColumns = 40
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textLines = 24
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textPage1Address = uint16(0x0400)
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textPage2Address = uint16(0x0800)
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graphWidth = 280
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graphHeight = 192
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graphPage1Address = uint16(0x2000)
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graphPage2Address = uint16(0x4000)
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)
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func getTextCharOffset(col int, line int) uint16 {
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// See "Understanding the Apple II", page 5-10
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// http://www.applelogic.org/files/UNDERSTANDINGTHEAII.pdf
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section := line / 8 // Top, middle and bottom
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eigth := line % 8
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return uint16(section*40 + eigth*0x80 + col)
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}
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func getTextChar(a *Apple2, col int, line int, page int) uint8 {
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address := textPage1Address
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if page == 1 {
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address = textPage2Address
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}
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address += getTextCharOffset(col, line)
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return a.mmu.internalPeek(address)
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}
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func snapshotTextMode(a *Apple2, page int) *image.RGBA {
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// Color for typical Apple ][ period green phosphor monitors
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// See: https://superuser.com/questions/361297/what-colour-is-the-dark-green-on-old-fashioned-green-screen-computer-displays
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p1GreenPhosphorColor := color.RGBA{65, 255, 0, 255}
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// Flash mode is 2Hz
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isFlashedFrame := time.Now().Nanosecond() > (1 * 1000 * 1000 * 1000 / 2)
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width := textColumns * charWidth
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height := textLines * charHeight
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size := image.Rect(0, 0, width, height)
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img := image.NewRGBA(size)
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for x := 0; x < width; x++ {
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for y := 0; y < height; y++ {
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line := y / charHeight
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col := x / charWidth
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rowInChar := y % charHeight
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colInChar := x % charWidth
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char := getTextChar(a, col, line, page)
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topBits := char >> 6
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isInverse := topBits == 0
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isFlash := topBits == 1
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pixel := a.cg.getPixel(char, rowInChar, colInChar)
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pixel = pixel != (isInverse || (isFlash && isFlashedFrame))
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var colour color.Color
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if pixel {
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colour = p1GreenPhosphorColor
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} else {
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colour = color.Black
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}
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img.Set(x, y, colour)
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}
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}
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return img
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}
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func getGraphLineOffset(line int) uint16 {
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// See "Understanding the Apple II", page 5-14
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// http://www.applelogic.org/files/UNDERSTANDINGTHEAII.pdf
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section := line >> 6 // Top, middle and bottom
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outerEigth := (line >> 3) & 0x07
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innerEigth := line & 0x07
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return uint16(section*40 + outerEigth*0x80 + innerEigth*0x400)
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}
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func getGraphLine(a *Apple2, line int, page int) []uint8 {
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address := graphPage1Address
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if page == 1 {
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address = graphPage2Address
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}
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address += getGraphLineOffset(line)
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hi := uint8(address >> 8)
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lo := uint8(address)
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memPage := a.mmu.internalPage(hi)
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return memPage[lo : lo+40]
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}
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func snapshotHiResModeReferenceMono(a *Apple2, page int) *image.RGBA {
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// As defined on "Apple II Reference Manual", page 19
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size := image.Rect(0, 0, graphWidth, graphHeight)
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img := image.NewRGBA(size)
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for y := 0; y < graphHeight; y++ {
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bytes := getGraphLine(a, y, page)
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x := 0
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for _, b := range bytes {
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for j := uint(0); j < 7; j++ {
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bit := (b >> j) & 1
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colour := color.Black
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if bit == 1 {
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colour = color.White
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}
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img.Set(x, y, colour)
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x++
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}
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}
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}
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return img
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}
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func snapshotHiResModeMonoShift(a *Apple2, page int) *image.RGBA {
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// As described in "Undertanding the Apple II", with half pixel shifts
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size := image.Rect(0, 0, 2*graphWidth, graphHeight)
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img := image.NewRGBA(size)
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for y := 0; y < graphHeight; y++ {
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bytes := getGraphLine(a, y, page)
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x := 0
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previousColour := color.Black
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for _, b := range bytes {
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shifted := b>>7 == 1
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for j := uint(0); j < 7; j++ {
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bit := (b >> j) & 1
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colour := color.Black
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if bit == 1 {
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colour = color.White
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}
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if shifted {
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img.Set(x, y, previousColour)
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} else {
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img.Set(x, y, colour)
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}
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img.Set(x+1, y, colour)
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previousColour = colour
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x += 2
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}
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}
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}
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return img
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}
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func snapshotHiResModeReferenceColor(a *Apple2, page int) *image.RGBA {
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// As defined on "Apple II Reference Manual", page 19
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size := image.Rect(0, 0, graphWidth, graphHeight)
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img := image.NewRGBA(size)
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// RGB values from https://mrob.com/pub/xapple2/colors.html
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black := color.RGBA{0, 0, 0, 255}
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violet := color.RGBA{255, 68, 253, 255}
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red := color.RGBA{255, 106, 60, 255}
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green := color.RGBA{20, 246, 60, 255}
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blue := color.RGBA{20, 207, 253, 255}
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white := color.RGBA{255, 255, 255, 255}
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colorMap := [][][]color.Color{
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{
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/* 00 */ {black, black},
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/* 01 */ {black, green},
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/* 10 */ {violet, black},
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/* 11 */ {white, white},
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},
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{
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/* 00 */ {black, black},
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/* 01 */ {black, red},
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/* 10 */ {blue, black},
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/* 11 */ {white, white},
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},
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}
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for y := 0; y < graphHeight; y++ {
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bytes := getGraphLine(a, y, page)
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x := 0
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previous := uint8(0)
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for _, b := range bytes {
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shift := b >> 7
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for j := uint(0); j < 7; j++ {
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bit := (b >> j) & 1
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even := x%2 == 0
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if even {
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previous = bit
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} else {
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pair := colorMap[shift][(previous<<1)+bit]
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img.Set(x-1, y, pair[0])
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img.Set(x, y, pair[1])
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}
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x++
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}
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}
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}
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return img
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}
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func snapshotHiResModeReferenceColorSolid(a *Apple2, page int) *image.RGBA {
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// As defined on "Apple II Reference Manual", page 19
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// but with more solid colors
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size := image.Rect(0, 0, graphWidth, graphHeight)
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img := image.NewRGBA(size)
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// RGB values from https://mrob.com/pub/xapple2/colors.html
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black := color.RGBA{0, 0, 0, 255}
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violet := color.RGBA{255, 68, 253, 255}
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red := color.RGBA{255, 106, 60, 255}
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green := color.RGBA{20, 246, 60, 255}
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blue := color.RGBA{20, 207, 253, 255}
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white := color.RGBA{255, 255, 255, 255}
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colorMap := [][]color.Color{
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{
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/* 00 */ black,
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/* 01 */ green,
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/* 10 */ violet,
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/* 11 */ white,
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},
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{
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/* 00 */ black,
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/* 01 */ red,
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/* 10 */ blue,
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/* 11 */ white,
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},
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}
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for y := 0; y < graphHeight; y++ {
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bytes := getGraphLine(a, y, page)
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x := 0
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previous := uint8(0)
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for _, b := range bytes {
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shift := b >> 7
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for j := uint(0); j < 7; j++ {
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bit := (b >> j) & 1
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even := x%2 == 0
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if even {
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previous = bit
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} else {
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colour := colorMap[shift][(previous<<1)+bit]
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img.Set(x-1, y, colour)
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img.Set(x, y, colour)
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}
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x++
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}
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}
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}
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return img
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}
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189
apple2/screenHgr.go
Normal file
189
apple2/screenHgr.go
Normal file
@ -0,0 +1,189 @@
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package apple2
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import (
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"image"
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"image/color"
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)
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func getGraphLineOffset(line int) uint16 {
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// See "Understanding the Apple II", page 5-14
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// http://www.applelogic.org/files/UNDERSTANDINGTHEAII.pdf
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section := line >> 6 // Top, middle and bottom
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outerEigth := (line >> 3) & 0x07
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innerEigth := line & 0x07
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return uint16(section*40 + outerEigth*0x80 + innerEigth*0x400)
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}
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func getGraphLine(a *Apple2, line int, page int) []uint8 {
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address := graphPage1Address
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if page == 1 {
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address = graphPage2Address
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}
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address += getGraphLineOffset(line)
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hi := uint8(address >> 8)
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lo := uint8(address)
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memPage := a.mmu.internalPage(hi)
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return memPage[lo : lo+40]
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}
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func snapshotHiResModeReferenceMono(a *Apple2, page int) *image.RGBA {
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// As defined on "Apple II Reference Manual", page 19
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size := image.Rect(0, 0, graphWidth, graphHeight)
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img := image.NewRGBA(size)
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for y := 0; y < graphHeight; y++ {
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bytes := getGraphLine(a, y, page)
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x := 0
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for _, b := range bytes {
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for j := uint(0); j < 7; j++ {
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bit := (b >> j) & 1
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colour := color.Black
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if bit == 1 {
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colour = color.White
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}
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img.Set(x, y, colour)
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x++
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}
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}
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}
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return img
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}
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func snapshotHiResModeMonoShift(a *Apple2, page int) *image.RGBA {
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// As described in "Undertanding the Apple II", with half pixel shifts
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size := image.Rect(0, 0, 2*graphWidth, graphHeight)
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img := image.NewRGBA(size)
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for y := 0; y < graphHeight; y++ {
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bytes := getGraphLine(a, y, page)
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x := 0
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previousColour := color.Black
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for _, b := range bytes {
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shifted := b>>7 == 1
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for j := uint(0); j < 7; j++ {
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bit := (b >> j) & 1
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colour := color.Black
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if bit == 1 {
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colour = color.White
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}
|
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|
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if shifted {
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img.Set(x, y, previousColour)
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} else {
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img.Set(x, y, colour)
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}
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img.Set(x+1, y, colour)
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previousColour = colour
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x += 2
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}
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}
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}
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return img
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}
|
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|
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func snapshotHiResModeReferenceColor(a *Apple2, page int) *image.RGBA {
|
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// As defined on "Apple II Reference Manual", page 19
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size := image.Rect(0, 0, graphWidth, graphHeight)
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img := image.NewRGBA(size)
|
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|
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// RGB values from https://mrob.com/pub/xapple2/colors.html
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black := color.RGBA{0, 0, 0, 255}
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violet := color.RGBA{255, 68, 253, 255}
|
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red := color.RGBA{255, 106, 60, 255}
|
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green := color.RGBA{20, 246, 60, 255}
|
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blue := color.RGBA{20, 207, 253, 255}
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white := color.RGBA{255, 255, 255, 255}
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colorMap := [][][]color.Color{
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{
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/* 00 */ {black, black},
|
||||
/* 01 */ {black, green},
|
||||
/* 10 */ {violet, black},
|
||||
/* 11 */ {white, white},
|
||||
},
|
||||
{
|
||||
/* 00 */ {black, black},
|
||||
/* 01 */ {black, red},
|
||||
/* 10 */ {blue, black},
|
||||
/* 11 */ {white, white},
|
||||
},
|
||||
}
|
||||
|
||||
for y := 0; y < graphHeight; y++ {
|
||||
bytes := getGraphLine(a, y, page)
|
||||
x := 0
|
||||
previous := uint8(0)
|
||||
for _, b := range bytes {
|
||||
shift := b >> 7
|
||||
for j := uint(0); j < 7; j++ {
|
||||
bit := (b >> j) & 1
|
||||
even := x%2 == 0
|
||||
if even {
|
||||
previous = bit
|
||||
} else {
|
||||
pair := colorMap[shift][(previous<<1)+bit]
|
||||
img.Set(x-1, y, pair[0])
|
||||
img.Set(x, y, pair[1])
|
||||
}
|
||||
x++
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return img
|
||||
}
|
||||
|
||||
func snapshotHiResModeReferenceColorSolid(a *Apple2, page int) *image.RGBA {
|
||||
// As defined on "Apple II Reference Manual", page 19
|
||||
// but with more solid colors
|
||||
size := image.Rect(0, 0, graphWidth, graphHeight)
|
||||
img := image.NewRGBA(size)
|
||||
|
||||
// RGB values from https://mrob.com/pub/xapple2/colors.html
|
||||
black := color.RGBA{0, 0, 0, 255}
|
||||
violet := color.RGBA{255, 68, 253, 255}
|
||||
red := color.RGBA{255, 106, 60, 255}
|
||||
green := color.RGBA{20, 246, 60, 255}
|
||||
blue := color.RGBA{20, 207, 253, 255}
|
||||
white := color.RGBA{255, 255, 255, 255}
|
||||
colorMap := [][]color.Color{
|
||||
{
|
||||
/* 00 */ black,
|
||||
/* 01 */ green,
|
||||
/* 10 */ violet,
|
||||
/* 11 */ white,
|
||||
},
|
||||
{
|
||||
/* 00 */ black,
|
||||
/* 01 */ red,
|
||||
/* 10 */ blue,
|
||||
/* 11 */ white,
|
||||
},
|
||||
}
|
||||
|
||||
for y := 0; y < graphHeight; y++ {
|
||||
bytes := getGraphLine(a, y, page)
|
||||
x := 0
|
||||
previous := uint8(0)
|
||||
for _, b := range bytes {
|
||||
shift := b >> 7
|
||||
for j := uint(0); j < 7; j++ {
|
||||
bit := (b >> j) & 1
|
||||
even := x%2 == 0
|
||||
if even {
|
||||
previous = bit
|
||||
} else {
|
||||
colour := colorMap[shift][(previous<<1)+bit]
|
||||
img.Set(x-1, y, colour)
|
||||
img.Set(x, y, colour)
|
||||
}
|
||||
x++
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return img
|
||||
}
|
||||
119
apple2/screenNtscFilter.go
Normal file
119
apple2/screenNtscFilter.go
Normal file
@ -0,0 +1,119 @@
|
||||
package apple2
|
||||
|
||||
import (
|
||||
"image"
|
||||
"image/color"
|
||||
)
|
||||
|
||||
func getNTSCColorMap() []color.Color {
|
||||
// RGB values from https://mrob.com/pub/xapple2/colors.html
|
||||
black := color.RGBA{0, 0, 0, 255} /*COLOR=0 */ /* 0 0 0*/
|
||||
|
||||
dkBlue := color.RGBA{96, 78, 189, 255} /*COLOR=2 */ /* 0 60 25*/
|
||||
red := color.RGBA{227, 30, 96, 255} /*COLOR=1 */ /* 90 60 25*/
|
||||
brown := color.RGBA{96, 114, 3, 255} /*COLOR=8 */ /*180 60 25*/
|
||||
dkGreen := color.RGBA{0, 163, 96, 255} /*COLOR=4 */ /*270 60 25*/
|
||||
|
||||
grey := color.RGBA{156, 156, 156, 255} /*COLOR=10*/ /* 0 0 50*/
|
||||
purple := color.RGBA{255, 68, 253, 255} /*HCOLOR=2*/ /* 45 100 50*/
|
||||
orange := color.RGBA{255, 106, 60, 255} /*HCOLOR=5*/ /*135 100 50*/
|
||||
green := color.RGBA{20, 245, 60, 255} /*HCOLOR=1*/ /*225 100 50*/
|
||||
blue := color.RGBA{20, 207, 253, 255} /*HCOLOR=6*/ /*315 100 50*/
|
||||
|
||||
//purple := color.RGBA{255, 68, 253, 255} /*COLOR=3 */ /* 45 100 50*/
|
||||
//orange := color.RGBA{255, 106, 60, 255} /*COLOR=9 */ /*135 100 50*/
|
||||
//green := color.RGBA{20, 245, 60, 255} /*COLOR=12*/ /*225 100 50*/
|
||||
//blue := color.RGBA{20, 207, 253, 255} /*COLOR=6 */ /*315 100 50*/
|
||||
|
||||
ltBlue := color.RGBA{208, 195, 255, 255} /*COLOR=7 */ /* 0 60 75*/
|
||||
pink := color.RGBA{255, 160, 208, 255} /*COLOR=11*/ /* 90 60 75*/
|
||||
yellow := color.RGBA{208, 221, 141, 255} /*COLOR=13*/ /*180 60 75*/
|
||||
aqua := color.RGBA{114, 255, 208, 255} /*COLOR=14*/ /*270 60 75*/
|
||||
|
||||
white := color.RGBA{255, 255, 255, 255} /*COLOR=15*/ /* 0 0 100*/
|
||||
|
||||
colorMap := []color.Color{
|
||||
/* 0000 */ black,
|
||||
/* 0001 */ brown,
|
||||
/* 0010 */ dkGreen,
|
||||
/* 0011 */ green,
|
||||
/* 0100 */ dkBlue,
|
||||
/* 0101 */ grey,
|
||||
/* 0110 */ blue,
|
||||
/* 0111 */ aqua,
|
||||
/* 1000 */ red,
|
||||
/* 1001 */ orange,
|
||||
/* 1010 */ grey,
|
||||
/* 1011 */ yellow,
|
||||
/* 1100 */ purple,
|
||||
/* 1101 */ pink,
|
||||
/* 1110 */ ltBlue,
|
||||
/* 1111 */ white,
|
||||
}
|
||||
return colorMap
|
||||
}
|
||||
|
||||
func filterNTSCColorStatic(in *image.RGBA) *image.RGBA {
|
||||
colorMap := getNTSCColorMap()
|
||||
|
||||
b := in.Bounds()
|
||||
size := image.Rect(0, 0, b.Dx()/4, b.Dy())
|
||||
out := image.NewRGBA(size)
|
||||
for y := b.Min.Y; y < b.Max.Y; y++ {
|
||||
for x := b.Min.X; x < b.Max.X; x += 4 {
|
||||
v := 0
|
||||
for i := 0; i < 4; i++ {
|
||||
cIn := in.At(x+i, y)
|
||||
r, _, _, _ := cIn.RGBA()
|
||||
v = v << 1
|
||||
if r != 0 {
|
||||
v++
|
||||
}
|
||||
}
|
||||
cOut := colorMap[v]
|
||||
out.Set(x/4, y, cOut)
|
||||
}
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
func filterNTSCColorMoving(blacker bool, in *image.RGBA) *image.RGBA {
|
||||
colorMap := getNTSCColorMap()
|
||||
|
||||
b := in.Bounds()
|
||||
size := image.Rect(0, 0, b.Dx()+3, b.Dy())
|
||||
out := image.NewRGBA(size)
|
||||
|
||||
// We store the last four bits. We start will 0000
|
||||
v := 0
|
||||
for y := b.Min.Y; y < b.Max.Y; y++ {
|
||||
for x := b.Min.X; x < b.Dx(); x++ {
|
||||
cIn := in.At(x, y)
|
||||
r, _, _, _ := cIn.RGBA()
|
||||
|
||||
pos := 1 << (3 - uint(x%4))
|
||||
var cOut color.Color
|
||||
if r != 0 {
|
||||
v |= pos
|
||||
cOut = colorMap[v]
|
||||
} else {
|
||||
v &^= pos
|
||||
if blacker {
|
||||
// If there is no luminance, let's have black anyway
|
||||
cOut = colorMap[0]
|
||||
} else {
|
||||
cOut = colorMap[v]
|
||||
}
|
||||
}
|
||||
out.Set(x, y, cOut)
|
||||
}
|
||||
|
||||
// We fade for the last three positions
|
||||
for x := b.Dx(); x < b.Max.X; x++ {
|
||||
v = (v << 1) & 0xF
|
||||
cOut := colorMap[v]
|
||||
out.Set(x, y, cOut)
|
||||
}
|
||||
}
|
||||
return out
|
||||
}
|
||||
77
apple2/screenText.go
Normal file
77
apple2/screenText.go
Normal file
@ -0,0 +1,77 @@
|
||||
package apple2
|
||||
|
||||
import (
|
||||
"image"
|
||||
"image/color"
|
||||
"time"
|
||||
)
|
||||
|
||||
const (
|
||||
charWidth = 7
|
||||
charHeight = 8
|
||||
textColumns = 40
|
||||
textLines = 24
|
||||
textPage1Address = uint16(0x0400)
|
||||
textPage2Address = uint16(0x0800)
|
||||
graphWidth = 280
|
||||
graphHeight = 192
|
||||
graphPage1Address = uint16(0x2000)
|
||||
graphPage2Address = uint16(0x4000)
|
||||
)
|
||||
|
||||
func getTextCharOffset(col int, line int) uint16 {
|
||||
|
||||
// See "Understanding the Apple II", page 5-10
|
||||
// http://www.applelogic.org/files/UNDERSTANDINGTHEAII.pdf
|
||||
section := line / 8 // Top, middle and bottom
|
||||
eigth := line % 8
|
||||
return uint16(section*40 + eigth*0x80 + col)
|
||||
}
|
||||
|
||||
func getTextChar(a *Apple2, col int, line int, page int) uint8 {
|
||||
address := textPage1Address
|
||||
if page == 1 {
|
||||
address = textPage2Address
|
||||
}
|
||||
address += getTextCharOffset(col, line)
|
||||
return a.mmu.internalPeek(address)
|
||||
}
|
||||
|
||||
func snapshotTextMode(a *Apple2, page int) *image.RGBA {
|
||||
// Color for typical Apple ][ period green phosphor monitors
|
||||
// See: https://superuser.com/questions/361297/what-colour-is-the-dark-green-on-old-fashioned-green-screen-computer-displays
|
||||
p1GreenPhosphorColor := color.RGBA{65, 255, 0, 255}
|
||||
|
||||
// Flash mode is 2Hz
|
||||
isFlashedFrame := time.Now().Nanosecond() > (1 * 1000 * 1000 * 1000 / 2)
|
||||
|
||||
width := textColumns * charWidth
|
||||
height := textLines * charHeight
|
||||
size := image.Rect(0, 0, width, height)
|
||||
img := image.NewRGBA(size)
|
||||
|
||||
for x := 0; x < width; x++ {
|
||||
for y := 0; y < height; y++ {
|
||||
line := y / charHeight
|
||||
col := x / charWidth
|
||||
rowInChar := y % charHeight
|
||||
colInChar := x % charWidth
|
||||
char := getTextChar(a, col, line, page)
|
||||
topBits := char >> 6
|
||||
isInverse := topBits == 0
|
||||
isFlash := topBits == 1
|
||||
|
||||
pixel := a.cg.getPixel(char, rowInChar, colInChar)
|
||||
pixel = pixel != (isInverse || (isFlash && isFlashedFrame))
|
||||
var colour color.Color
|
||||
if pixel {
|
||||
colour = p1GreenPhosphorColor
|
||||
} else {
|
||||
colour = color.Black
|
||||
}
|
||||
img.Set(x, y, colour)
|
||||
}
|
||||
}
|
||||
|
||||
return img
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user