hires starting

2026-04-26 03:28:52 +00:00 · 2017-08-10 20:06:41 -04:00
parent 7575e135b4
commit ff51d2f4b2
2 changed files with 59 additions and 0 deletions
@@ -0,0 +1,55 @@
+//
+//  HiresMode.swift
+//  FruitMachine
+//
+//  Created by Christopher Rohl on 8/10/17.
+//  Copyright © 2017 Christopher Rohl. All rights reserved.
+//
+
+import Cocoa
+
+class HiresMode: NSObject {
+    static func putHiresPixel(buffer: UnsafeMutablePointer<BitmapPixelsLE555.PixelData>?, pixel: UInt8, address: UInt16) {
+        let pageBase: Address
+        
+        if(EmulatedSystemInstance!.videoSoftswitches.PAGE_2) {
+            pageBase = 0x4000
+        } else {
+            pageBase = 0x2000
+        }
+        
+        //Convert the address into an (X,Y) pixel coordinate.
+        var offset = address - 0x2000
+        if(offset >= 0x2000) { //Page 2 address
+            offset -= 0x2000
+        }
+        
+        //Find the row number.
+        var rowNumber = offset / 0x80
+        let lowByte = offset & 0x0FF
+        
+        if(0x28 ... 0x4F ~= lowByte || 0xA8 ... 0xCF ~= lowByte) {
+            //Middle third.
+            rowNumber += 64
+            //cellX = (lowByte & ~(0x80)) - 0x28
+        }
+        else if(0x50 ... 0x77 ~= lowByte || 0xD0 ... 0xF7 ~= lowByte) {
+            //Bottom third.
+            rowNumber += 64
+            //cellX = (lowByte & ~(0x80)) - 0x50
+        }
+        else if(0x78 ... 0x7F ~= lowByte || 0xF8 ... 0xFF ~= lowByte) {
+            //Discard.
+        }
+        else {
+            //Top third.
+            rowNumber += 0
+            //cellX = (lowByte & ~(0x80))
+        }
+        
+        rowNumber += offset / 0x400
+        
+        let columnByte = (offset & 0x0007)
+        
+    }
+}