mirror of
https://github.com/ivanizag/izapple2.git
synced 2024-12-23 00:30:21 +00:00
159 lines
4.6 KiB
Go
159 lines
4.6 KiB
Go
package izapple2
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import (
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"image"
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"image/color"
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"github.com/ivanizag/izapple2/screen"
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)
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const (
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textPage1Address = uint16(0x0400)
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textPage2Address = uint16(0x0800)
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textPageSize = uint16(0x0400)
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hiResPage1Address = uint16(0x2000)
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hiResPage2Address = uint16(0x4000)
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hiResPageSize = uint16(0x2000)
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shResPageAddress = uint16(0x2000)
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shResPageSize = uint16(0x8000)
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)
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// GetCurrentVideoMode returns the active video mode
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func (a *Apple2) GetCurrentVideoMode() uint16 {
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isTextMode := a.io.isSoftSwitchActive(ioFlagText)
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isHiResMode := a.io.isSoftSwitchActive(ioFlagHiRes)
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is80Columns := a.io.isSoftSwitchActive(ioFlag80Col)
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isStore80Active := a.mmu.store80Active
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isDoubleResMode := !isTextMode && is80Columns && !a.io.isSoftSwitchActive(ioFlagAnnunciator3)
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isSuperHighResMode := a.io.isSoftSwitchActive(ioDataNewVideo)
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isVidex := a.softVideoSwitch.isActive()
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isRGBCard := a.io.isSoftSwitchActive(ioFlagRGBCardActive)
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rgbFlag1 := a.io.isSoftSwitchActive(ioFlag1RGBCard)
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rgbFlag2 := a.io.isSoftSwitchActive(ioFlag2RGBCard)
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isMono560 := isDoubleResMode && !rgbFlag1 && !rgbFlag2
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isRGBMixMode := isDoubleResMode && !rgbFlag1 && rgbFlag2
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isRGB160Mode := isDoubleResMode && rgbFlag1 && !rgbFlag2
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isMixMode := a.io.isSoftSwitchActive(ioFlagMixed)
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isSecondPage := a.io.isSoftSwitchActive(ioFlagSecondPage) && !a.mmu.store80Active
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isAltText := a.isApple2e && a.io.isSoftSwitchActive(ioFlagAltChar)
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var mode uint16
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if isSuperHighResMode {
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mode = screen.VideoSHR
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isMixMode = false
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} else if isVidex {
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mode = screen.VideoVidex
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isMixMode = false
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} else if isTextMode {
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if is80Columns {
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mode = screen.VideoText80
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} else if isRGBCard && isStore80Active {
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mode = screen.VideoText40RGB
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} else {
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mode = screen.VideoText40
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}
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isMixMode = false
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} else if isHiResMode {
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if !isDoubleResMode {
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mode = screen.VideoHGR
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} else if isMono560 {
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mode = screen.VideoMono560
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} else if isRGBMixMode {
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mode = screen.VideoRGBMix
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} else if isRGB160Mode {
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mode = screen.VideoRGB160
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} else {
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mode = screen.VideoDHGR
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}
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} else if isDoubleResMode {
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mode = screen.VideoDGR
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} else {
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mode = screen.VideoGR
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}
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// Modifiers
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if isMixMode {
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if is80Columns {
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mode |= screen.VideoMixText80
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} else /* if isStore80Active {
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mode |= screen.VideoMixText40RGB
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} else */{
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mode |= screen.VideoMixText40
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}
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}
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if isSecondPage {
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mode |= screen.VideoSecondPage
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}
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if isAltText {
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mode |= screen.VideoAltText
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}
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return mode
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}
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// GetTextMemory returns a slice to the text memory pages
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func (a *Apple2) GetTextMemory(secondPage bool, ext bool) []uint8 {
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mem := a.mmu.getVideoRAM(ext)
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addressStart := textPage1Address
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if secondPage {
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addressStart = textPage2Address
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}
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return mem.subRange(addressStart, addressStart+textPageSize)
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}
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// GetVideoMemory returns a slice to the video memory pages
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func (a *Apple2) GetVideoMemory(secondPage bool, ext bool) []uint8 {
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mem := a.mmu.getVideoRAM(ext)
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addressStart := hiResPage1Address
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if secondPage {
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addressStart = hiResPage2Address
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}
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return mem.subRange(addressStart, addressStart+hiResPageSize)
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}
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// GetSuperVideoMemory returns a slice to the SHR video memory
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func (a *Apple2) GetSuperVideoMemory() []uint8 {
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mem := a.mmu.getVideoRAM(true)
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return mem.subRange(shResPageAddress, shResPageAddress+shResPageSize)
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}
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// GetCharacterPixel returns the pixel as output by the character generator
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func (a *Apple2) GetCharacterPixel(char uint8, rowInChar int, colInChar int, isAltText bool, isFlashedFrame bool) bool {
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var pixel bool
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if a.isApple2e {
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vid6 := (char & 0x40) != 0
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vid7 := (char & 0x80) != 0
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char := char & 0x3f
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if vid6 && (vid7 || isAltText) {
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char += 0x40
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}
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if vid7 || (vid6 && isFlashedFrame && !isAltText) {
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char += 0x80
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}
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pixel = !a.cg.getPixel(char, rowInChar, colInChar)
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} else {
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pixel = a.cg.getPixel(char, rowInChar, colInChar)
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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 = pixel != (isInverse || (isFlash && isFlashedFrame))
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}
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return pixel
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}
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// GetCardImage returns an image provided by a card, like the videx card
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func (a *Apple2) GetCardImage(light color.Color) *image.RGBA {
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return a.softVideoSwitch.BuildAlternateImage(light)
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}
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// DumpTextModeAnsi returns the text mode contents using ANSI escape codes for reverse and flash
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func DumpTextModeAnsi(a *Apple2) string {
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is80Columns := a.io.isSoftSwitchActive(ioFlag80Col)
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isSecondPage := a.io.isSoftSwitchActive(ioFlagSecondPage) && !a.mmu.store80Active
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isAltText := a.isApple2e && a.io.isSoftSwitchActive(ioFlagAltChar)
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return screen.RenderTextModeAnsi(a, is80Columns, isSecondPage, isAltText, a.isApple2e)
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}
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