Initial commit for C implementation of hires rendering

src/dev/video/hires.c

@@ -0,0 +1,54 @@
+//
+//  hires.c
+//  A2Mac
+//
+//  Created by Tamas Rudnai on 5/28/21.
+//  Copyright © 2021 GameAlloy. All rights reserved.
+//
+
+#include "hires.h"
+#include "mmio.h"
+
+static const uint16_t PageSize  = 0x2000;
+static const uint16_t Page1Addr = 0x2000;
+static const uint16_t Page2Addr = 0x4000;
+
+static const uint16_t PixelWidth  = 280;
+static const uint16_t PixelMixedHeight = 160;
+static const uint16_t PixelHeight = 192;
+static const uint16_t MixedHeight = 160;
+static const uint8_t MixedTextHeight = 4;
+static const uint8_t blockRows = 24;
+static const uint8_t blockCols = 40;
+static const uint8_t blockWidth = PixelWidth / blockCols;
+static const uint8_t blockHeight = PixelHeight / blockRows;
+
+const uint8_t* HiResRawPointer = Apple2_64K_RAM + Page1Addr;
+const uint8_t* HiResBuffer1 = Apple2_64K_MEM + Page1Addr;
+const uint8_t* HiResBuffer2 = Apple2_64K_MEM + Page2Addr;
+uint8_t* HiResBufferPointer = Apple2_64K_MEM + Page1Addr;
+
+// holds the starting addresses for each lines minus the screen page starting address
+uint16_t HiResLineAddrTbl[PixelHeight];
+
+typedef enum {
+    _B = 0,
+    _G = 1,
+    _R = 2,
+    _A = 3,
+} RGBA_t;
+
+
+void initHiResLineAddresses() {
+    int i = 0;
+    
+    for( int x = 0; x <= 0x50; x += 0x28 ) {
+        for( int y = 0; y <= 0x380; y += 0x80 ) {
+            for( int z = 0; z <= 0x1C00; z += 0x400 ) {
+                HiResLineAddrTbl[i++] = x + y + z;
+            }
+        }
+    }
+}
+
+

src/dev/video/hires.h

@@ -0,0 +1,14 @@
+//
+//  hires.h
+//  A2Mac
+//
+//  Created by Tamas Rudnai on 5/28/21.
+//  Copyright © 2021 GameAlloy. All rights reserved.
+//
+
+#ifndef hires_h
+#define hires_h
+
+#include <stdio.h>
+
+#endif /* hires_h */