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Rudimentary implementation of DGR / Double LoRes

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This commit is contained in:
Tamas Rudnai 2024-01-14 20:48:18 -08:00
parent 8cafeff4d9
commit 67cc9d2359
1 changed files with 14 additions and 7 deletions
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21
A2Mac/LoRes.swift
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@ -41,6 +41,8 @@ class LoRes: NSView {
let LoResIntBuffer1 = UnsafeRawBufferPointer(start: RAM + Page1Addr, count: PageSize * 2)
let LoResIntBuffer2 = UnsafeRawBufferPointer(start: RAM + Page2Addr, count: PageSize * 2)
let LoResAuxBuffer1 = UnsafeRawBufferPointer(start: AUX + Page1Addr, count: PageSize * 2)
let LoResAuxBuffer2 = UnsafeRawBufferPointer(start: AUX + Page2Addr, count: PageSize * 2)
let LoResBuffer1 = UnsafeRawBufferPointer(start: MEM + Page1Addr, count: PageSize * 2)
let LoResBuffer2 = UnsafeRawBufferPointer(start: MEM + Page2Addr, count: PageSize * 2)
var LoResBufferPointer1 = UnsafeRawBufferPointer(start: MEM + Page1Addr, count: PageSize * 2)
@ -339,6 +341,11 @@ class LoRes: NSView {
func colorPixel ( pixelAddr : Int, color : Int ) {
LoRes.pixelsSRGB[pixelAddr] = colorTable[color]
}
func rot4bit(_ i : Int) -> Int {
return ((i << 1) | ((i & 0x08) >> 3)) & 0x0F
}
func Render() {
@ -354,21 +361,21 @@ class LoRes: NSView {
}
if MEMcfg.txt_page_2 == 1 {
if (MEMcfg.RD_AUX_MEM == 0) {
LoResBufferPointer1 = LoResBuffer2
LoResBufferPointer1 = LoResAuxBuffer2
LoResBufferPointer2 = LoResBuffer2
}
else {
LoResBufferPointer1 = LoResIntBuffer2
LoResBufferPointer1 = LoResBuffer2
LoResBufferPointer2 = LoResIntBuffer2
}
}
else {
if (MEMcfg.RD_AUX_MEM == 0) {
LoResBufferPointer1 = LoResBuffer1
LoResBufferPointer1 = LoResAuxBuffer1
LoResBufferPointer2 = LoResBuffer1
}
else {
LoResBufferPointer1 = LoResIntBuffer1
LoResBufferPointer1 = LoResAuxBuffer1
LoResBufferPointer2 = LoResIntBuffer1
}
}
@ -407,8 +414,8 @@ class LoRes: NSView {
shadowScreen[ screenIdx ] = block1
shadowScreen[ screenIdx + 1] = block2
colorPixel(pixelAddr: pixelHAddr, color: block1 & 0x0F )
colorPixel(pixelAddr: pixelLAddr, color: (block1 >> 4) & 0x0F )
colorPixel(pixelAddr: pixelHAddr, color: rot4bit(block1))
colorPixel(pixelAddr: pixelLAddr, color: rot4bit(block1 >> 4))
colorPixel(pixelAddr: pixelHAddr + 1, color: block2 & 0x0F )
colorPixel(pixelAddr: pixelLAddr + 1, color: (block2 >> 4) & 0x0F )
@ -446,7 +453,7 @@ class LoRes: NSView {
}
}
// needsDisplay = true // refresh the entire screen
needsDisplay = true // refresh the entire screen
}