2019-04-21 19:04:02 +00:00
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package apple2
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import (
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"fmt"
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"image"
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"image/color"
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"image/png"
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"os"
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)
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2019-04-21 22:18:14 +00:00
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// Snapshot the currently visible screen
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func Snapshot(a *Apple2) *image.RGBA {
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2019-04-26 16:08:30 +00:00
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isTextMode := a.io.isSoftSwitchActive(ioFlagText)
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2019-04-21 19:04:02 +00:00
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is80ColMode := a.io.isSoftSwitchActive(ioFlag80Col)
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2019-04-26 16:08:30 +00:00
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isHiResMode := a.io.isSoftSwitchActive(ioFlagHiRes)
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2019-04-21 19:04:02 +00:00
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pageIndex := 0
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if a.io.isSoftSwitchActive(ioFlagSecondPage) {
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pageIndex = 1
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}
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2019-04-26 16:08:30 +00:00
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if isTextMode {
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if is80ColMode {
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// Not supported
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} else {
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return snapshotTextMode(a, pageIndex)
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}
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} else {
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if isHiResMode {
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return snapshotGraphMode(a, pageIndex)
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} else {
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// Not supported
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}
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2019-04-21 19:04:02 +00:00
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}
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2019-04-26 16:08:30 +00:00
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//fmt.Printf("g: %v, 8: %v, h: %v\n", isTextMode, is80ColMode, isHiResMode)
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2019-04-21 19:04:02 +00:00
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return nil
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//panic("Screen mode not supported")
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}
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func saveSnapshot(a *Apple2) {
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2019-04-21 22:18:14 +00:00
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img := Snapshot(a)
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2019-04-21 19:04:02 +00:00
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if img == nil {
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return
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}
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f, err := os.Create("snapshot.png")
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if err != nil {
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panic(err)
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}
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defer f.Close()
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fmt.Println("Saving snapshot")
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png.Encode(f, img)
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}
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const (
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2019-04-26 16:08:30 +00:00
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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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2019-04-21 19:04:02 +00:00
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)
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2019-04-26 16:08:30 +00:00
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func getTextCharOffset(col int, line int) uint16 {
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2019-04-21 19:04:02 +00:00
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// See "Understand 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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2019-04-26 16:08:30 +00:00
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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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2019-04-21 19:04:02 +00:00
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return a.mmu.internalPeek(address)
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}
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2019-04-21 22:18:14 +00:00
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func snapshotTextMode(a *Apple2, page int) *image.RGBA {
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2019-04-26 16:08:30 +00:00
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// TODO: Missing inverse and flash modes
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2019-04-21 19:04:02 +00:00
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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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2019-04-21 22:18:14 +00:00
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img := image.NewRGBA(size)
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2019-04-21 19:04:02 +00:00
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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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pixel := a.cg.getPixel(char, rowInChar, colInChar)
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2019-04-21 22:18:14 +00:00
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colour := color.Black
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2019-04-21 19:04:02 +00:00
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if pixel {
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2019-04-21 22:18:14 +00:00
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colour = color.White
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2019-04-21 19:04:02 +00:00
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}
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2019-04-21 22:18:14 +00:00
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img.Set(x, y, colour)
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2019-04-21 19:04:02 +00:00
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}
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}
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return img
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}
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2019-04-26 16:08:30 +00:00
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func getGraphLineOffset(line int) uint16 {
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// See "Understand 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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//fmt.Printf("line: %v, lo: %x\n", line, lo)
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return memPage[lo : lo+40]
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}
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func snapshotGraphMode(a *Apple2, page int) *image.RGBA {
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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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