mirror of
https://github.com/AppleWin/AppleWin.git
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247 lines
7.1 KiB
C++
247 lines
7.1 KiB
C++
/*
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AppleWin : An Apple //e emulator for Windows
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Copyright (C) 2010-2011, William S Simms
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Copyright (C) 2016, Tom Charlesworth
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AppleWin is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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AppleWin is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with AppleWin; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "StdAfx.h"
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#include "Applewin.h"
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#include "Video.h"
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#include "NTSC_CharSet.h"
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unsigned char csbits_enhanced2e[2][256][8]; // Enhanced //e (2732 4K video ROM)
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static unsigned char csbits_2e_pal[2][256][8]; // PAL Original or Enhanced //e (2764 8K video ROM - low 4K) via rocker switch under keyboard
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unsigned char csbits_2e[2][256][8]; // Original //e (no mousetext)
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unsigned char csbits_a2[1][256][8]; // ][ and ][+
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unsigned char csbits_pravets82[1][256][8]; // Pravets 82
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unsigned char csbits_pravets8M[1][256][8]; // Pravets 8M
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unsigned char csbits_pravets8C[2][256][8]; // Pravets 8A & 8C
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//
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static const UINT bitmapWidth = 256;
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static const UINT bitmapWidthBytes = bitmapWidth/8;
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static const UINT bitmapHeight = 768;
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static const UINT charWidth = 16;
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static const UINT charWidthBytes = 16/8;
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static const UINT charHeight = 16;
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static void get_csbits_xy(csbits_t csbits, UINT ch, UINT cx, UINT cy, const BYTE* pBitmap)
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{
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_ASSERT(ch < 256);
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_ASSERT((cx < bitmapWidth/charWidth) && (cy < bitmapHeight/charHeight));
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pBitmap += cy*charHeight*bitmapWidthBytes + cx*charWidthBytes;
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for (UINT y=0; y<8; y++)
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{
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BYTE n = 0;
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for (int x=0; x<14; x+=2)
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{
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UINT xp = x/8;
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BYTE d = pBitmap[xp];
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UINT b = 7 - x%8;
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if (d & (1<<b)) n |= 0x80;
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n >>= 1;
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}
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csbits[0][ch][y] = n;
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pBitmap += bitmapWidthBytes*2;
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}
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}
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static void get_csbits(csbits_t csbits, const char* resourceName, const UINT cy0)
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{
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const UINT bufferSize = bitmapWidthBytes*bitmapHeight;
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BYTE* pBuffer = new BYTE [bufferSize];
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HBITMAP hCharBitmap = LoadBitmap(g_hInstance, resourceName);
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GetBitmapBits(hCharBitmap, bufferSize, pBuffer);
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for (UINT cy=cy0, ch=0; cy<cy0+16; cy++)
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{
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for (UINT cx=0; cx<16; cx++)
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{
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get_csbits_xy(csbits, ch++, cx, cy, pBuffer);
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}
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}
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DeleteObject(hCharBitmap);
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delete [] pBuffer;
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}
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//-------------------------------------
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// ROM address (RA):
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// -----------------
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// . RA10,..,RA3;SEGC,SEGB,SEGA => [2^8][2^3] => 256 chars of 8 lines (total = 2KiB)
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// . VID7,..,VID0 is the 8-bit video character (eg. from TEXT/$400 memory)
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//
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// UTAIIe:8-13, Table 8.2:
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//
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// ALTCHRSET | RA10 | RA9
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//------------------------------------------
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// 0 | VID7 + VID6.FLASH | VID6.VID7
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// 1 | VID7 | VID6
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//
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// FLASH toggles every 16 VBLs, so alternates between selecting NORMAL control/special and INVERSE control/special
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//
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void userVideoRom4K(csbits_t csbits, const BYTE* pVideoRom)
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{
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int RA = 0; // rom address
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int i = 0;
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// regular char set
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for (; i<64; i++, RA+=8) // [00..3F] INVERSE / [40..7F] FLASH
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{
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for (int y=0; y<8; y++)
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{
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csbits[0][i][y] = pVideoRom[RA+y] ^ 0xff; // UTAIIe:8-11 "dot patterns in the video ROM are inverted..."
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csbits[0][i+64][y] = pVideoRom[RA+y] ^ 0xff; // UTAIIe:8-14 (Table 8.3) we use FLASH=0, so RA=00ccccccsss
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}
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}
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RA = (1<<10 | 0<<9); // UTAIIe:8-14 (Table 8.3)
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for (i=128; i<256; i++, RA+=8) // [80..BF] NORMAL
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{
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for (int y=0; y<8; y++)
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{
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csbits[0][i][y] = pVideoRom[RA+y] ^ 0xff; // UTAIIe:8-11 "dot patterns in the video ROM are inverted..."
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}
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}
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RA = (1<<10 | 1<<9); // UTAIIe:8-14 (Table 8.3)
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for (i=192; i<256; i++, RA+=8) // [C0..FF] NORMAL
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{
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for (int y=0; y<8; y++)
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{
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csbits[0][i][y] = pVideoRom[RA+y] ^ 0xff; // UTAIIe:8-11 "dot patterns in the video ROM are inverted..."
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}
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}
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// alt char set
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RA = 0;
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for (i=0; i<256; i++, RA+=8) // [00..7F] INVERSE / [80..FF] NORMAL
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{
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for (int y=0; y<8; y++)
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{
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csbits[1][i][y] = pVideoRom[RA+y] ^ 0xff; // UTAIIe:8-11 "dot patterns in the video ROM are inverted..."
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}
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}
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}
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void userVideoRomForIIe(void)
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{
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const BYTE* pVideoRom;
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UINT size = GetVideoRom(pVideoRom); // 2K or 4K or 8K
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if (size < kVideoRomSize4K)
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return;
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if (size == kVideoRomSize4K)
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{
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userVideoRom4K(&csbits_enhanced2e[0], pVideoRom);
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}
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else
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{
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userVideoRom4K(&csbits_2e_pal[0], pVideoRom);
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userVideoRom4K(&csbits_enhanced2e[0], &pVideoRom[4*1024]);
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}
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// NB. Same *custom* US video ROM for Original & Enhanced //e
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memcpy(csbits_2e, csbits_enhanced2e, sizeof(csbits_enhanced2e));
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}
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//-------------------------------------
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void userVideoRom2K(csbits_t csbits, const BYTE* pVideoRom)
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{
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int RA = 0; // rom address
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for (int i=0; i<256; i++, RA+=8)
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{
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for (int y=0; y<8; y++)
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{
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BYTE n = pVideoRom[RA+y];
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// UTAII:8-30 "Bit 7 of your EPROM fonts will control flashing in the lower 1024 bytes of the EPROM"
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// UTAII:8-31 "If you leave O7 (EPROM Output7) reset in these patterns, the resulting characters will be inversions..."
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if (!(n & 0x80) && RA < 1024)
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n = n ^ 0x7f;
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// UTAII:8-30 "TEXT ROM pattern is ... reversed"
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BYTE d = 0;
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for (BYTE j=0; j<7; j++, n >>= 1) // Just bits [0..6]
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d = (d << 1) | (n & 1);
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csbits[0][i][y] = d;
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}
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}
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}
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void userVideoRomForIIPlus(void)
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{
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const BYTE* pVideoRom;
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UINT size = GetVideoRom(pVideoRom); // 2K or 4K or 8K
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if (size != kVideoRomSize2K)
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return;
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userVideoRom2K(&csbits_a2[0], pVideoRom);
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}
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//-------------------------------------
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void make_csbits(void)
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{
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get_csbits(&csbits_enhanced2e[0], TEXT("CHARSET40"), 0); // Enhanced //e: Alt char set off
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get_csbits(&csbits_enhanced2e[1], TEXT("CHARSET40"), 16); // Enhanced //e: Alt char set on (mousetext)
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get_csbits(&csbits_a2[0], TEXT("CHARSET40"), 32); // Apple ][, ][+
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get_csbits(&csbits_pravets82[0], TEXT("CHARSET82"), 0); // Pravets 82
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get_csbits(&csbits_pravets8M[0], TEXT("CHARSET8M"), 0); // Pravets 8M
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get_csbits(&csbits_pravets8C[0], TEXT("CHARSET8C"), 0); // Pravets 8A / 8C: Alt char set off
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get_csbits(&csbits_pravets8C[1], TEXT("CHARSET8C"), 16); // Pravets 8A / 8C: Alt char set on
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// Original //e is just Enhanced //e with the 32 mousetext chars [0x40..0x5F] replaced by the non-alt charset chars [0x40..0x5F]
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memcpy(csbits_2e, csbits_enhanced2e, sizeof(csbits_enhanced2e));
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memcpy(&csbits_2e[1][64], &csbits_2e[0][64], 32*8);
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// Try to use any user-provided video ROM for Original/Enhanced //e
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userVideoRomForIIe();
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// Try to use any user-provided video ROM for II/II+
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userVideoRomForIIPlus();
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}
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csbits_t Get2e_csbits(void)
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{
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const csbits_t videoRom4K = (GetApple2Type() == A2TYPE_APPLE2E) ? csbits_2e : csbits_enhanced2e;
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if (IsVideoRom4K()) // 4K means US-only, so no secondary PAL video ROM
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return videoRom4K;
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return GetVideoRomRockerSwitch() == false ? videoRom4K : csbits_2e_pal; // NB. Same PAL video ROM for Original & Enhanced //e
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}
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