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interlace mode

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minjaesong
2026-06-17 11:02:00 +09:00
parent 35fb833835
commit aaf84e0fa4
2 changed files with 38 additions and 4 deletions
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40
tsvm_core/src/net/torvald/tsvm/peripheral/GraphicsAdapter.kt
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@@ -139,6 +139,9 @@ open class GraphicsAdapter(private val assetsRoot: String, val vm: VM, val confi
var graphicsMode = 0
private var layerArrangement = 0
/** Interlaced-mode level `i` of MMIO 7 (`0b00ii000t`), 0..3. Only has an effect in
* graphics modes 1 and 2; reads back as zero in every other mode (see terranmon.txt §MMIO 7). */
private var interlaceMode = 0
private val memTextCursorPosOffset = 0L
@@ -344,7 +347,11 @@ open class GraphicsAdapter(private val assetsRoot: String, val vm: VM, val confi
ttyRawMode.toInt(1) or
blinkCursor.toInt()).toByte()
private fun getGraphicsAttributes(): Byte = graphicsDisableTexts.toInt().toByte()
private fun getGraphicsAttributes(): Byte {
// interlace only takes effect (and reads back nonzero) in graphics modes 1 and 2
val i = if (graphicsMode == 1 || graphicsMode == 2) interlaceMode.and(3) else 0
return (i.shl(4) or graphicsDisableTexts.toInt()).toByte()
}
private fun setTextmodeAttributes(rawbyte: Byte) {
currentChrRom = rawbyte.toInt().and(0b11110000).ushr(4)
@@ -353,7 +360,9 @@ open class GraphicsAdapter(private val assetsRoot: String, val vm: VM, val confi
}
private fun setGraphicsAttributes(rawbyte: Byte) {
graphicsDisableTexts = rawbyte.and(1) == 1.toByte()
val bi = rawbyte.toUint()
graphicsDisableTexts = bi.and(1) == 1
interlaceMode = bi.ushr(4).and(3) // 0b00ii000t
}
override fun mmio_read(addr: Long): Byte? {
@@ -1128,7 +1137,32 @@ open class GraphicsAdapter(private val assetsRoot: String, val vm: VM, val confi
if (xoff in -(280 - 1) until 280) {
for (x in xs) {
val colour = layerOrder.map { layer ->
// Interlace: interweave the layers in a 2x2 checkerboard so they spatially
// blend (terranmon.txt §MMIO 7). The tile selects which layer(s) appear at
// each logical pixel; layerOrder is low->high draw order.
// mode 2 (2 layers): [L1 L2 / L2 L1] for any nonzero i
// mode 1 (4 layers): low(L?) drawn behind, high drawn over, the checkerboard
// selecting the middle layer(s) per level i.
val cellOrder: List<Int> = if (interlaceMode <= 0) layerOrder
else {
val diag = (x and 1) == (y and 1) // top-left & bottom-right
val topRight = (x and 1) == 1 && (y and 1) == 0
if (graphicsMode == 2) // only two layers exist
listOf(if (diag) layerOrder[0] else layerOrder[1])
else when (interlaceMode) { // mode 1, four layers (low,midLow,midHigh,high)
// [L1 L2 / L2 L1] L1=mid-low, L2=mid-high; low behind, high over
1 -> if (diag) listOf(layerOrder[0], layerOrder[1], layerOrder[3])
else listOf(layerOrder[0], layerOrder[2], layerOrder[3])
// [L1 L2 / L3 L1] L1=low, L2=mid-low, L3=mid-high; high over
2 -> if (diag) listOf(layerOrder[0], layerOrder[3])
else if (topRight) listOf(layerOrder[1], layerOrder[3])
else listOf(layerOrder[2], layerOrder[3])
// [L1 L2 / L3 L4] one full layer per cell
else -> if (diag) listOf(if ((x and 1) == 0) layerOrder[0] else layerOrder[3])
else listOf(if (topRight) layerOrder[1] else layerOrder[2])
}
}
val colour = cellOrder.map { layer ->
if (graphicsMode == 1) {
val colourIndex = framebuffer[(280L * 224 * layer) + (y * 280 + x)].toUint()
Color(