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https://github.com/freewilll/apple2-go.git
synced 2025-04-13 10:37:33 +00:00
Added colored hires mode and monochrome keyboard toggle
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Will Angenent
parent
9323078bc0
commit
85417562c1
@ -7,8 +7,8 @@ An Apple //e emulator written in Go using [ebiten](https://github.com/hajimehosh
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* MOS 6502 CPU
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* Keyboard
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* 40 column text mode
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* Low resolution color graphics
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* High resolution monochrome graphics
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* Low resolution monochrome and color graphics
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* High resolution monochrome and color graphics
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* Upper memory bank switching: $d000 page and ROM/RAM
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* Main memory page1/page2 switching in text, lores and hires
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* Disk image reading & writing
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@ -34,7 +34,7 @@ Download `apple2e.rom` from
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## Keyboard shortcuts
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* ctrl-alt-R reset
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* ctrl-alt-M mute
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* ctrl-alt-M toggle monochrome/color display
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* ctrl-alt-C caps lock
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* ctrl-alt-F show FPS
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22
apple2.go
22
apple2.go
@ -26,8 +26,9 @@ var (
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disableDosDelay *bool // Disable DOS delay functions
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breakAddress *uint16 // Break address from the command line
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resetKeysDown bool // Keep track of ctrl-alt-R key down state
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fpsKeysDown bool // Keep track of ctrl-alt-F key down state
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resetKeysDown bool // Keep track of ctrl-alt-R key down state
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fpsKeysDown bool // Keep track of ctrl-alt-F key down state
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monochromeKeysDown bool // Keep track of ctrl-alt-M key down state
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)
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// checkSpecialKeys checks
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@ -53,14 +54,27 @@ func checkSpecialKeys() {
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} else {
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fpsKeysDown = false
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}
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// Check for ctrl-alt-M and toggle FPS display
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if ebiten.IsKeyPressed(ebiten.KeyControl) && ebiten.IsKeyPressed(ebiten.KeyAlt) && ebiten.IsKeyPressed(ebiten.KeyM) {
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monochromeKeysDown = true
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} else if ebiten.IsKeyPressed(ebiten.KeyControl) && ebiten.IsKeyPressed(ebiten.KeyAlt) && !ebiten.IsKeyPressed(ebiten.KeyM) && monochromeKeysDown {
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monochromeKeysDown = false
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video.Monochrome = !video.Monochrome
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} else {
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monochromeKeysDown = false
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}
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}
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// update is the main ebiten loop
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func update(screen *ebiten.Image) error {
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keyboard.Poll() // Convert ebiten's keyboard state to an interal value
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checkSpecialKeys() // Poll the keyboard and check for R and F keys
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if !(fpsKeysDown || monochromeKeysDown) {
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keyboard.Poll() // Convert ebiten's keyboard state to an interal value
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}
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system.FrameCycles = 0 // Reset cycles processed this frame
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system.LastAudioCycles = 0 // Reset processed audio cycles
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exitAtBreak := true // Die if a BRK instruction is seen
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@ -122,7 +136,7 @@ func main() {
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// Start the ebiten main loop
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ebiten.SetRunnableInBackground(true)
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ebiten.Run(update, 280*video.ScreenSizeFactor, 192*video.ScreenSizeFactor, 2, "Apple //e")
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ebiten.Run(update, 560, 384, 1, "Apple //e")
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// The main loop has ended, flush any data to the disk image if any writes have been done.
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disk.FlushImage()
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153
video/video.go
153
video/video.go
@ -12,9 +12,6 @@ import (
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)
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const (
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// ScreenSizeFactor is the fFactor by which the whole screen is resized
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ScreenSizeFactor = 1
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textVideoMemory = 0x400 // Base location of page 1 text video memory
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flashFrames = 11 // Number of frames when FLASH mode is toggled
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)
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@ -23,19 +20,27 @@ const (
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type drawTextLoresByte func(*ebiten.Image, int, int, uint8) error
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var (
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flashCounter int // Counter used for flashing characters on the text screen
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flashOn bool // Are we currently flashing?
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loresSquares [16]*ebiten.Image // Colored blocks for lores rendering
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flashCounter int // Counter used for flashing characters on the text screen
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flashOn bool // Are we currently flashing?
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monochromeLoresSquares [16]*ebiten.Image // Monochrome blocks for lores rendering
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colorLoresSquares [16]*ebiten.Image // Colored blocks for lores rendering
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colors [16]color.NRGBA // 4-bit Colors
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// ShowFPS determines if the FPS is shown in the corner of the video
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ShowFPS bool
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ShowFPS bool
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Monochrome bool
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)
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// initLoresSquares creates 16 colored squares for the lores renderer
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func initLoresSquares() {
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var err error
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for i := 0; i < 16; i++ {
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loresSquares[i], err = ebiten.NewImage(7, 4, ebiten.FilterNearest)
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monochromeLoresSquares[i], err = ebiten.NewImage(7, 4, ebiten.FilterNearest)
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if err != nil {
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panic(err)
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}
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colorLoresSquares[i], err = ebiten.NewImage(7, 4, ebiten.FilterNearest)
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if err != nil {
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panic(err)
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}
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@ -45,27 +50,36 @@ func initLoresSquares() {
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// https://mrob.com/pub/xgithub.com/freewilll/apple2/colors.html
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// https://archive.org/details/IIgs_2523063_Master_Color_Values
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alpha := uint8(0xff)
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loresSquares[0x00].Fill(color.NRGBA{0, 0, 0, alpha})
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loresSquares[0x01].Fill(color.NRGBA{221, 0, 51, alpha})
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loresSquares[0x02].Fill(color.NRGBA{0, 0, 153, alpha})
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loresSquares[0x03].Fill(color.NRGBA{221, 34, 221, alpha})
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loresSquares[0x04].Fill(color.NRGBA{0, 119, 34, alpha})
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loresSquares[0x05].Fill(color.NRGBA{85, 85, 85, alpha})
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loresSquares[0x06].Fill(color.NRGBA{34, 34, 255, alpha})
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loresSquares[0x07].Fill(color.NRGBA{102, 170, 255, alpha})
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loresSquares[0x08].Fill(color.NRGBA{136, 85, 0, alpha})
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loresSquares[0x09].Fill(color.NRGBA{255, 102, 0, alpha})
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loresSquares[0x0A].Fill(color.NRGBA{170, 170, 170, alpha})
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loresSquares[0x0B].Fill(color.NRGBA{255, 153, 136, alpha})
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loresSquares[0x0C].Fill(color.NRGBA{17, 221, 0, alpha})
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loresSquares[0x0D].Fill(color.NRGBA{255, 255, 0, alpha})
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loresSquares[0x0E].Fill(color.NRGBA{68, 255, 153, alpha})
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loresSquares[0x0F].Fill(color.NRGBA{255, 255, 255, alpha})
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colors[0x00] = color.NRGBA{0, 0, 0, alpha}
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colors[0x01] = color.NRGBA{221, 0, 51, alpha}
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colors[0x02] = color.NRGBA{0, 0, 153, alpha}
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colors[0x03] = color.NRGBA{221, 34, 221, alpha}
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colors[0x04] = color.NRGBA{0, 119, 34, alpha}
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colors[0x05] = color.NRGBA{85, 85, 85, alpha}
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colors[0x06] = color.NRGBA{34, 34, 255, alpha}
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colors[0x07] = color.NRGBA{102, 170, 255, alpha}
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colors[0x08] = color.NRGBA{136, 85, 0, alpha}
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colors[0x09] = color.NRGBA{255, 102, 0, alpha}
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colors[0x0A] = color.NRGBA{170, 170, 170, alpha}
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colors[0x0B] = color.NRGBA{255, 153, 136, alpha}
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colors[0x0C] = color.NRGBA{17, 221, 0, alpha}
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colors[0x0D] = color.NRGBA{255, 255, 0, alpha}
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colors[0x0E] = color.NRGBA{68, 255, 153, alpha}
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colors[0x0F] = color.NRGBA{255, 255, 255, alpha}
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for i := 0; i < 0x10; i++ {
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colorLoresSquares[i].Fill(colors[i])
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avgIntensity := float64(int(colors[i].R)+int(colors[i].G)+int(colors[i].B)) / 3
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avgColor := color.NRGBA{byte(avgIntensity * 0.2), byte(avgIntensity * 0.75), byte(avgIntensity * 0.2), alpha}
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monochromeLoresSquares[i].Fill(avgColor)
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}
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}
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// Init the video data structures used for rendering
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func Init() {
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ShowFPS = false
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Monochrome = true
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initTextCharMap()
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initLoresSquares()
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@ -95,8 +109,8 @@ func drawText(screen *ebiten.Image, x int, y int, value uint8) error {
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}
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Scale(ScreenSizeFactor, ScreenSizeFactor)
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op.GeoM.Translate(ScreenSizeFactor*7*float64(x), ScreenSizeFactor*8*float64(y))
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op.GeoM.Scale(2, 2)
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op.GeoM.Translate(2*7*float64(x), 2*8*float64(y))
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r := image.Rect(0, 0, 7, 8)
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op.SourceRect = &r
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@ -107,8 +121,10 @@ func drawText(screen *ebiten.Image, x int, y int, value uint8) error {
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op.ColorM.Translate(1, 1, 1, 0)
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}
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// Make it look greenish
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op.ColorM.Scale(0.20, 0.75, 0.20, 1)
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if Monochrome {
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// Make it look greenish
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op.ColorM.Scale(0.20, 0.75, 0.20, 1)
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}
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return screen.DrawImage(charMap[value], op)
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}
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@ -121,9 +137,17 @@ func drawLores(screen *ebiten.Image, x int, y int, value uint8) error {
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// Render top & bottom squares
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for i := 0; i < 2; i++ {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Scale(ScreenSizeFactor, ScreenSizeFactor)
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op.GeoM.Translate(ScreenSizeFactor*7*float64(x), ScreenSizeFactor*8*float64(y)+float64(i)*4)
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if err := screen.DrawImage(loresSquares[values[i]], op); err != nil {
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op.GeoM.Scale(2, 2)
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op.GeoM.Translate(2*7*float64(x), 2*8*float64(y)+2*float64(i)*4)
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var loresSquare *ebiten.Image
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if Monochrome {
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loresSquare = monochromeLoresSquares[values[i]]
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} else {
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loresSquare = colorLoresSquares[values[i]]
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}
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if err := screen.DrawImage(loresSquare, op); err != nil {
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return err
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}
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}
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@ -187,11 +211,8 @@ func drawTextOrLoresScreen(screen *ebiten.Image) error {
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// drawHiresScreen draws an entire hires screen. If it's in mixed mode, the lower end is drawn in text.
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func drawHiresScreen(screen *ebiten.Image) error {
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if ScreenSizeFactor != 1 {
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panic("Hires mode for ScreenSizeFactor != 1 not implemented")
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}
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pixels := make([]byte, 280*192*4)
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pixels := make([]byte, 560*384*4)
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halfPixels := make([]byte, 14)
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// Loop over all hires lines
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for y := 0; y < 192; y++ {
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@ -207,21 +228,65 @@ func drawHiresScreen(screen *ebiten.Image) error {
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yOffset += 0x2000
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}
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// For each byte, flip the 7 bits and write it to the pixels array
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// Initialize 4-bit 4-color and 14 half-pixels
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var color uint8 // Current 4-bit color
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colorPos := uint8(0) // Current half-pixel in the 4-bit color
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for i := 0; i < 14; i++ {
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halfPixels[i] = 0
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}
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// For each byte, expand the 7 bits to the 14 half-pixels array
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// If the high bit is set, shift one half pixel over.
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// Don't shift half-bits in monochrome mode
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for x := 0; x < 40; x++ {
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offset := yOffset + x
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value := mmu.ReadPageTable[offset>>8][offset&0xff]
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value &= 0x7f
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phaseShifted := value >> 7
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var hp uint8
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if Monochrome {
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hp = 0
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} else {
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hp = phaseShifted
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}
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halfPixels[0] = halfPixels[13] // Rotate the last phase shifted pixel in
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// Double up the pixels into half pixels starting at offset hp
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for bit := 0; bit < 7; bit++ {
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b := float64(value & 1)
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halfPixels[hp] = value & 1
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hp = hp + 1
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if hp < 14 {
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halfPixels[hp] = value & 1
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hp = hp + 1
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}
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value = value >> 1
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p := (y*280 + x*7 + bit) * 4
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}
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pixels[p+0] = byte(0xff * float64(0.20) * b)
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pixels[p+1] = byte(0xff * float64(0.75) * b)
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pixels[p+2] = byte(0xff * float64(0.20) * b)
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pixels[p+3] = 0xff
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for hp = 0; hp < 14; hp++ {
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// Update the color bit in colorPos with the half pixel value
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color &= ((1 << colorPos) ^ 0xf)
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color |= halfPixels[hp] << colorPos
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colorPos = (colorPos + 1) & 3
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// Draw two lines at a time
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for rowDouble := 0; rowDouble < 2; rowDouble++ {
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p := ((y*2+rowDouble)*560 + x*2*7 + int(hp)) * 4
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if Monochrome {
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b := float64(halfPixels[hp])
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pixels[p+0] = byte(0xff * float64(0.20) * b)
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pixels[p+1] = byte(0xff * float64(0.75) * b)
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pixels[p+2] = byte(0xff * float64(0.20) * b)
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pixels[p+3] = 0xff
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} else {
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pixels[p+0] = colors[color].R
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pixels[p+1] = colors[color].G
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pixels[p+2] = colors[color].B
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pixels[p+3] = 0xff
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}
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}
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}
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}
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}
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