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/* |
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* VIC_SC.cpp - 6569R5 emulation (cycle based) |
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* |
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* Frodo Copyright (C) Christian Bauer |
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* |
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* This program 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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* |
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* This program 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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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; 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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|
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/* |
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* Incompatibilities: |
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* ------------------ |
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* |
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* - Color of $ff bytes read when BA is low and AEC is high |
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* is not correct |
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* - Changes to border/background color are visible 7 pixels |
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* too late |
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* - Sprite data access doesn't respect BA |
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* - Sprite collisions are only detected within the visible |
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* screen area (excluding borders) |
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* - Sprites are only drawn if they completely fit within the |
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* left/right limits of the chunky bitmap |
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*/ |
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|
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#include "sysdeps.h" |
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|
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#include "VIC.h" |
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#include "C64.h" |
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#include "CPUC64.h" |
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#include "Display.h" |
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#include "Prefs.h" |
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|
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|
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// First and last displayed line |
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const int FIRST_DISP_LINE = 0x10; |
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const int LAST_DISP_LINE = 0x11f; |
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|
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// First and last possible line for Bad Lines |
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const int FIRST_DMA_LINE = 0x30; |
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const int LAST_DMA_LINE = 0xf7; |
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|
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// Display window coordinates |
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const int ROW25_YSTART = 0x33; |
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const int ROW25_YSTOP = 0xfb; |
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const int ROW24_YSTART = 0x37; |
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const int ROW24_YSTOP = 0xf7; |
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|
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#if defined(SMALL_DISPLAY) |
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/* This does not work yet, the sprite code doesn't know about it. */ |
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const int COL40_XSTART = 0x14; |
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const int COL40_XSTOP = 0x154; |
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const int COL38_XSTART = 0x1B; |
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const int COL38_XSTOP = 0x14B; |
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#else |
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const int COL40_XSTART = 0x20; |
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const int COL40_XSTOP = 0x160; |
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const int COL38_XSTART = 0x27; |
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const int COL38_XSTOP = 0x157; |
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#endif |
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|
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|
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// Tables for sprite X expansion |
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uint16 ExpTable[256] = { |
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0x0000, 0x0003, 0x000C, 0x000F, 0x0030, 0x0033, 0x003C, 0x003F, |
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0x00C0, 0x00C3, 0x00CC, 0x00CF, 0x00F0, 0x00F3, 0x00FC, 0x00FF, |
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0x0300, 0x0303, 0x030C, 0x030F, 0x0330, 0x0333, 0x033C, 0x033F, |
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0x03C0, 0x03C3, 0x03CC, 0x03CF, 0x03F0, 0x03F3, 0x03FC, 0x03FF, |
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0x0C00, 0x0C03, 0x0C0C, 0x0C0F, 0x0C30, 0x0C33, 0x0C3C, 0x0C3F, |
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0x0CC0, 0x0CC3, 0x0CCC, 0x0CCF, 0x0CF0, 0x0CF3, 0x0CFC, 0x0CFF, |
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0x0F00, 0x0F03, 0x0F0C, 0x0F0F, 0x0F30, 0x0F33, 0x0F3C, 0x0F3F, |
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0x0FC0, 0x0FC3, 0x0FCC, 0x0FCF, 0x0FF0, 0x0FF3, 0x0FFC, 0x0FFF, |
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0x3000, 0x3003, 0x300C, 0x300F, 0x3030, 0x3033, 0x303C, 0x303F, |
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0x30C0, 0x30C3, 0x30CC, 0x30CF, 0x30F0, 0x30F3, 0x30FC, 0x30FF, |
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0x3300, 0x3303, 0x330C, 0x330F, 0x3330, 0x3333, 0x333C, 0x333F, |
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0x33C0, 0x33C3, 0x33CC, 0x33CF, 0x33F0, 0x33F3, 0x33FC, 0x33FF, |
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0x3C00, 0x3C03, 0x3C0C, 0x3C0F, 0x3C30, 0x3C33, 0x3C3C, 0x3C3F, |
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0x3CC0, 0x3CC3, 0x3CCC, 0x3CCF, 0x3CF0, 0x3CF3, 0x3CFC, 0x3CFF, |
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0x3F00, 0x3F03, 0x3F0C, 0x3F0F, 0x3F30, 0x3F33, 0x3F3C, 0x3F3F, |
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0x3FC0, 0x3FC3, 0x3FCC, 0x3FCF, 0x3FF0, 0x3FF3, 0x3FFC, 0x3FFF, |
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0xC000, 0xC003, 0xC00C, 0xC00F, 0xC030, 0xC033, 0xC03C, 0xC03F, |
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0xC0C0, 0xC0C3, 0xC0CC, 0xC0CF, 0xC0F0, 0xC0F3, 0xC0FC, 0xC0FF, |
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0xC300, 0xC303, 0xC30C, 0xC30F, 0xC330, 0xC333, 0xC33C, 0xC33F, |
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0xC3C0, 0xC3C3, 0xC3CC, 0xC3CF, 0xC3F0, 0xC3F3, 0xC3FC, 0xC3FF, |
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0xCC00, 0xCC03, 0xCC0C, 0xCC0F, 0xCC30, 0xCC33, 0xCC3C, 0xCC3F, |
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0xCCC0, 0xCCC3, 0xCCCC, 0xCCCF, 0xCCF0, 0xCCF3, 0xCCFC, 0xCCFF, |
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0xCF00, 0xCF03, 0xCF0C, 0xCF0F, 0xCF30, 0xCF33, 0xCF3C, 0xCF3F, |
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0xCFC0, 0xCFC3, 0xCFCC, 0xCFCF, 0xCFF0, 0xCFF3, 0xCFFC, 0xCFFF, |
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0xF000, 0xF003, 0xF00C, 0xF00F, 0xF030, 0xF033, 0xF03C, 0xF03F, |
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0xF0C0, 0xF0C3, 0xF0CC, 0xF0CF, 0xF0F0, 0xF0F3, 0xF0FC, 0xF0FF, |
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0xF300, 0xF303, 0xF30C, 0xF30F, 0xF330, 0xF333, 0xF33C, 0xF33F, |
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0xF3C0, 0xF3C3, 0xF3CC, 0xF3CF, 0xF3F0, 0xF3F3, 0xF3FC, 0xF3FF, |
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0xFC00, 0xFC03, 0xFC0C, 0xFC0F, 0xFC30, 0xFC33, 0xFC3C, 0xFC3F, |
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0xFCC0, 0xFCC3, 0xFCCC, 0xFCCF, 0xFCF0, 0xFCF3, 0xFCFC, 0xFCFF, |
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0xFF00, 0xFF03, 0xFF0C, 0xFF0F, 0xFF30, 0xFF33, 0xFF3C, 0xFF3F, |
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0xFFC0, 0xFFC3, 0xFFCC, 0xFFCF, 0xFFF0, 0xFFF3, 0xFFFC, 0xFFFF |
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}; |
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|
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uint16 MultiExpTable[256] = { |
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0x0000, 0x0005, 0x000A, 0x000F, 0x0050, 0x0055, 0x005A, 0x005F, |
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0x00A0, 0x00A5, 0x00AA, 0x00AF, 0x00F0, 0x00F5, 0x00FA, 0x00FF, |
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0x0500, 0x0505, 0x050A, 0x050F, 0x0550, 0x0555, 0x055A, 0x055F, |
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0x05A0, 0x05A5, 0x05AA, 0x05AF, 0x05F0, 0x05F5, 0x05FA, 0x05FF, |
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0x0A00, 0x0A05, 0x0A0A, 0x0A0F, 0x0A50, 0x0A55, 0x0A5A, 0x0A5F, |
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0x0AA0, 0x0AA5, 0x0AAA, 0x0AAF, 0x0AF0, 0x0AF5, 0x0AFA, 0x0AFF, |
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0x0F00, 0x0F05, 0x0F0A, 0x0F0F, 0x0F50, 0x0F55, 0x0F5A, 0x0F5F, |
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0x0FA0, 0x0FA5, 0x0FAA, 0x0FAF, 0x0FF0, 0x0FF5, 0x0FFA, 0x0FFF, |
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0x5000, 0x5005, 0x500A, 0x500F, 0x5050, 0x5055, 0x505A, 0x505F, |
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0x50A0, 0x50A5, 0x50AA, 0x50AF, 0x50F0, 0x50F5, 0x50FA, 0x50FF, |
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0x5500, 0x5505, 0x550A, 0x550F, 0x5550, 0x5555, 0x555A, 0x555F, |
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0x55A0, 0x55A5, 0x55AA, 0x55AF, 0x55F0, 0x55F5, 0x55FA, 0x55FF, |
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0x5A00, 0x5A05, 0x5A0A, 0x5A0F, 0x5A50, 0x5A55, 0x5A5A, 0x5A5F, |
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0x5AA0, 0x5AA5, 0x5AAA, 0x5AAF, 0x5AF0, 0x5AF5, 0x5AFA, 0x5AFF, |
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0x5F00, 0x5F05, 0x5F0A, 0x5F0F, 0x5F50, 0x5F55, 0x5F5A, 0x5F5F, |
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0x5FA0, 0x5FA5, 0x5FAA, 0x5FAF, 0x5FF0, 0x5FF5, 0x5FFA, 0x5FFF, |
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0xA000, 0xA005, 0xA00A, 0xA00F, 0xA050, 0xA055, 0xA05A, 0xA05F, |
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0xA0A0, 0xA0A5, 0xA0AA, 0xA0AF, 0xA0F0, 0xA0F5, 0xA0FA, 0xA0FF, |
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0xA500, 0xA505, 0xA50A, 0xA50F, 0xA550, 0xA555, 0xA55A, 0xA55F, |
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0xA5A0, 0xA5A5, 0xA5AA, 0xA5AF, 0xA5F0, 0xA5F5, 0xA5FA, 0xA5FF, |
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0xAA00, 0xAA05, 0xAA0A, 0xAA0F, 0xAA50, 0xAA55, 0xAA5A, 0xAA5F, |
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0xAAA0, 0xAAA5, 0xAAAA, 0xAAAF, 0xAAF0, 0xAAF5, 0xAAFA, 0xAAFF, |
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0xAF00, 0xAF05, 0xAF0A, 0xAF0F, 0xAF50, 0xAF55, 0xAF5A, 0xAF5F, |
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0xAFA0, 0xAFA5, 0xAFAA, 0xAFAF, 0xAFF0, 0xAFF5, 0xAFFA, 0xAFFF, |
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0xF000, 0xF005, 0xF00A, 0xF00F, 0xF050, 0xF055, 0xF05A, 0xF05F, |
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0xF0A0, 0xF0A5, 0xF0AA, 0xF0AF, 0xF0F0, 0xF0F5, 0xF0FA, 0xF0FF, |
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0xF500, 0xF505, 0xF50A, 0xF50F, 0xF550, 0xF555, 0xF55A, 0xF55F, |
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0xF5A0, 0xF5A5, 0xF5AA, 0xF5AF, 0xF5F0, 0xF5F5, 0xF5FA, 0xF5FF, |
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0xFA00, 0xFA05, 0xFA0A, 0xFA0F, 0xFA50, 0xFA55, 0xFA5A, 0xFA5F, |
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0xFAA0, 0xFAA5, 0xFAAA, 0xFAAF, 0xFAF0, 0xFAF5, 0xFAFA, 0xFAFF, |
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0xFF00, 0xFF05, 0xFF0A, 0xFF0F, 0xFF50, 0xFF55, 0xFF5A, 0xFF5F, |
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0xFFA0, 0xFFA5, 0xFFAA, 0xFFAF, 0xFFF0, 0xFFF5, 0xFFFA, 0xFFFF |
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}; |
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|
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#ifdef GLOBAL_VARS |
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static uint16 mx[8]; // VIC registers |
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static uint8 my[8]; |
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static uint8 mx8; |
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static uint8 ctrl1, ctrl2; |
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static uint8 lpx, lpy; |
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static uint8 me, mxe, mye, mdp, mmc; |
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static uint8 vbase; |
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static uint8 irq_flag, irq_mask; |
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static uint8 clx_spr, clx_bgr; |
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static uint8 ec, b0c, b1c, b2c, b3c, mm0, mm1; |
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static uint8 sc[8]; |
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|
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static uint8 *ram, *char_rom, *color_ram; // Pointers to RAM and ROM |
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static C64 *the_c64; // Pointer to C64 |
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static C64Display *the_display; // Pointer to C64Display |
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static MOS6510 *the_cpu; // Pointer to 6510 |
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static MOS6569 *the_vic; // Pointer to self |
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|
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static uint8 colors[256]; // Indices of the 16 C64 colors (16 times mirrored to avoid "& 0x0f") |
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|
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static uint8 ec_color, b0c_color, b1c_color, b2c_color, b3c_color; // Indices for exterior/background colors |
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static uint8 mm0_color, mm1_color; // Indices for MOB multicolors |
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static uint8 spr_color[8]; // Indices for MOB colors |
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|
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static uint8 matrix_line[40]; // Buffer for video line, read in Bad Lines |
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static uint8 color_line[40]; // Buffer for color line, read in Bad Lines |
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|
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#ifdef __POWERPC__ |
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static double chunky_tmp[DISPLAY_X/8]; // Temporary line buffer for GameKit speedup |
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#endif |
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static uint8 *chunky_ptr; // Pointer in chunky bitmap buffer |
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static uint8 *chunky_line_start; // Pointer to start of current line in bitmap buffer |
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static uint8 *fore_mask_ptr; // Pointer in fore_mask_buf |
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static int xmod; // Number of bytes per row |
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|
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static uint16 raster_x; // Current raster x position |
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static uint16 raster_y; // Current raster line |
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static uint16 irq_raster; // Interrupt raster line |
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static uint16 dy_start; // Comparison values for border logic |
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static uint16 dy_stop; |
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static uint16 rc; // Row counter |
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static uint16 vc; // Video counter |
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static uint16 vc_base; // Video counter base |
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static uint16 x_scroll; // X scroll value |
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static uint16 y_scroll; // Y scroll value |
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static uint16 cia_vabase; // CIA VA14/15 video base |
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|
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static int cycle; // Current cycle in line (1..63) |
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|
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static int display_idx; // Index of current display mode |
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static int ml_index; // Index in matrix/color_line[] |
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static int skip_counter; // Counter for frame-skipping |
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|
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static uint16 mc[8]; // Sprite data counters |
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static uint16 mc_base[8]; // Sprite data counter bases |
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|
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static uint8 spr_coll_buf[0x180]; // Buffer for sprite-sprite collisions and priorities |
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static uint8 fore_mask_buf[0x180/8]; // Foreground mask for sprite-graphics collisions and priorities |
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|
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static bool display_state; // true: Display state, false: Idle state |
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static bool border_on; // Flag: Upper/lower border on |
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static bool frame_skipped; // Flag: Frame is being skipped |
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static bool bad_lines_enabled; // Flag: Bad Lines enabled for this frame |
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static bool lp_triggered; // Flag: Lightpen was triggered in this frame |
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static bool is_bad_line; // Flag: Current line is Bad Line |
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static bool draw_this_line; // Flag: This line is drawn on the screen |
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static bool ud_border_on; // Flag: Upper/lower border on |
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static bool vblanking; // Flag: VBlank in next cycle |
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|
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static bool border_on_sample[5]; // Samples of border state at different cycles (1, 17, 18, 56, 57) |
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static uint8 border_color_sample[DISPLAY_X/8]; // Samples of border color at each "displayed" cycle |
216 |
|
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static uint16 matrix_base; // Video matrix base |
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static uint16 char_base; // Character generator base |
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static uint16 bitmap_base; // Bitmap base |
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|
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static uint8 ref_cnt; // Refresh counter |
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static uint8 spr_exp_y; // 8 sprite y expansion flipflops |
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static uint8 spr_dma_on; // 8 flags: Sprite DMA active |
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static uint8 spr_disp_on; // 8 flags: Sprite display active |
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static uint8 spr_draw; // 8 flags: Draw sprite in this line |
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static uint16 spr_ptr[8]; // Sprite data pointers |
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|
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static uint8 gfx_data, char_data, color_data, last_char_data; |
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static uint8 spr_data[8][4]; // Sprite data read |
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static uint8 spr_draw_data[8][4]; // Sprite data for drawing |
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|
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static uint32 first_ba_cycle; // Cycle when BA first went low |
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#endif |
234 |
|
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|
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/* |
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* Constructor: Initialize variables |
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*/ |
239 |
|
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MOS6569::MOS6569(C64 *c64, C64Display *disp, MOS6510 *CPU, uint8 *RAM, uint8 *Char, uint8 *Color) |
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#ifndef GLOBAL_VARS |
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: ram(RAM), char_rom(Char), color_ram(Color), the_c64(c64), the_display(disp), the_cpu(CPU) |
243 |
#endif |
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{ |
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int i; |
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|
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// Set pointers |
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#ifdef GLOBAL_VARS |
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the_vic = this; |
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the_c64 = c64; |
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the_display = disp; |
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the_cpu = CPU; |
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ram = RAM; |
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char_rom = Char; |
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color_ram = Color; |
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#endif |
257 |
matrix_base = 0; |
258 |
char_base = 0; |
259 |
bitmap_base = 0; |
260 |
|
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// Get bitmap info |
262 |
chunky_ptr = chunky_line_start = disp->BitmapBase(); |
263 |
xmod = disp->BitmapXMod(); |
264 |
|
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// Initialize VIC registers |
266 |
mx8 = 0; |
267 |
ctrl1 = ctrl2 = 0; |
268 |
lpx = lpy = 0; |
269 |
me = mxe = mye = mdp = mmc = 0; |
270 |
vbase = irq_flag = irq_mask = 0; |
271 |
clx_spr = clx_bgr = 0; |
272 |
cia_vabase = 0; |
273 |
ec = b0c = b1c = b2c = b3c = mm0 = mm1 = 0; |
274 |
for (i=0; i<8; i++) mx[i] = my[i] = sc[i] = 0; |
275 |
|
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// Initialize other variables |
277 |
raster_y = TOTAL_RASTERS - 1; |
278 |
rc = 7; |
279 |
irq_raster = vc = vc_base = x_scroll = y_scroll = 0; |
280 |
dy_start = ROW24_YSTART; |
281 |
dy_stop = ROW24_YSTOP; |
282 |
ml_index = 0; |
283 |
|
284 |
cycle = 1; |
285 |
display_idx = 0; |
286 |
display_state = false; |
287 |
border_on = ud_border_on = vblanking = false; |
288 |
lp_triggered = draw_this_line = false; |
289 |
is_bad_line = false; |
290 |
|
291 |
spr_exp_y = spr_dma_on = spr_disp_on = 0; |
292 |
for (i=0; i<8; i++) { |
293 |
mc[i] = 63; |
294 |
mc_base[i] = 0; |
295 |
spr_ptr[i] = 0; |
296 |
} |
297 |
|
298 |
frame_skipped = false; |
299 |
skip_counter = 1; |
300 |
|
301 |
memset(spr_coll_buf, 0, 0x180); |
302 |
memset(fore_mask_buf, 0, 0x180/8); |
303 |
|
304 |
// Preset colors to black |
305 |
disp->InitColors(colors); |
306 |
ec_color = b0c_color = b1c_color = b2c_color = b3c_color = mm0_color = mm1_color = colors[0]; |
307 |
for (i=0; i<8; i++) spr_color[i] = colors[0]; |
308 |
} |
309 |
|
310 |
|
311 |
/* |
312 |
* Reinitialize the colors table for when the palette has changed |
313 |
*/ |
314 |
|
315 |
void MOS6569::ReInitColors(void) |
316 |
{ |
317 |
int i; |
318 |
|
319 |
// Build inverse color table. |
320 |
uint8 xlate_colors[256]; |
321 |
memset(xlate_colors, 0, sizeof(xlate_colors)); |
322 |
for (i=0; i<16; i++) |
323 |
xlate_colors[colors[i]] = i; |
324 |
|
325 |
// Get the new colors. |
326 |
the_display->InitColors(colors); |
327 |
|
328 |
// Build color translation table. |
329 |
for (i=0; i<256; i++) |
330 |
xlate_colors[i] = colors[xlate_colors[i]]; |
331 |
|
332 |
// Translate all the old colors variables. |
333 |
ec_color = colors[ec]; |
334 |
b0c_color = colors[b0c]; |
335 |
b1c_color = colors[b1c]; |
336 |
b2c_color = colors[b2c]; |
337 |
b3c_color = colors[b3c]; |
338 |
mm0_color = colors[mm0]; |
339 |
mm1_color = colors[mm1]; |
340 |
for (i=0; i<8; i++) |
341 |
spr_color[i] = colors[sc[i]]; |
342 |
|
343 |
// Translate the border color sample buffer. |
344 |
for (unsigned x = 0; x < sizeof(border_color_sample); x++) |
345 |
border_color_sample[x] = xlate_colors[border_color_sample[x]]; |
346 |
|
347 |
// Translate the chunky buffer. |
348 |
uint8 *scanline = the_display->BitmapBase(); |
349 |
for (int y=0; y<DISPLAY_Y; y++) { |
350 |
for (int x=0; x<DISPLAY_X; x++) |
351 |
scanline[x] = xlate_colors[scanline[x]]; |
352 |
scanline += xmod; |
353 |
} |
354 |
} |
355 |
|
356 |
|
357 |
/* |
358 |
* Get VIC state |
359 |
*/ |
360 |
|
361 |
void MOS6569::GetState(MOS6569State *vd) |
362 |
{ |
363 |
int i; |
364 |
|
365 |
vd->m0x = mx[0] & 0xff; vd->m0y = my[0]; |
366 |
vd->m1x = mx[1] & 0xff; vd->m1y = my[1]; |
367 |
vd->m2x = mx[2] & 0xff; vd->m2y = my[2]; |
368 |
vd->m3x = mx[3] & 0xff; vd->m3y = my[3]; |
369 |
vd->m4x = mx[4] & 0xff; vd->m4y = my[4]; |
370 |
vd->m5x = mx[5] & 0xff; vd->m5y = my[5]; |
371 |
vd->m6x = mx[6] & 0xff; vd->m6y = my[6]; |
372 |
vd->m7x = mx[7] & 0xff; vd->m7y = my[7]; |
373 |
vd->mx8 = mx8; |
374 |
|
375 |
vd->ctrl1 = (ctrl1 & 0x7f) | ((raster_y & 0x100) >> 1); |
376 |
vd->raster = raster_y & 0xff; |
377 |
vd->lpx = lpx; vd->lpy = lpy; |
378 |
vd->ctrl2 = ctrl2; |
379 |
vd->vbase = vbase; |
380 |
vd->irq_flag = irq_flag; |
381 |
vd->irq_mask = irq_mask; |
382 |
|
383 |
vd->me = me; vd->mxe = mxe; vd->mye = mye; vd->mdp = mdp; vd->mmc = mmc; |
384 |
vd->mm = clx_spr; vd->md = clx_bgr; |
385 |
|
386 |
vd->ec = ec; |
387 |
vd->b0c = b0c; vd->b1c = b1c; vd->b2c = b2c; vd->b3c = b3c; |
388 |
vd->mm0 = mm0; vd->mm1 = mm1; |
389 |
vd->m0c = sc[0]; |
390 |
vd->m1c = sc[1]; |
391 |
vd->m2c = sc[2]; |
392 |
vd->m3c = sc[3]; |
393 |
vd->m4c = sc[4]; |
394 |
vd->m5c = sc[5]; |
395 |
vd->m6c = sc[6]; |
396 |
vd->m7c = sc[7]; |
397 |
|
398 |
vd->pad0 = 0; |
399 |
vd->irq_raster = irq_raster; |
400 |
vd->vc = vc; |
401 |
vd->vc_base = vc_base; |
402 |
vd->rc = rc; |
403 |
vd->spr_dma = spr_dma_on; |
404 |
vd->spr_disp = spr_disp_on; |
405 |
for (i=0; i<8; i++) { |
406 |
vd->mc[i] = mc[i]; |
407 |
vd->mc_base[i] = mc_base[i]; |
408 |
} |
409 |
vd->display_state = display_state; |
410 |
vd->bad_line = raster_y >= FIRST_DMA_LINE && raster_y <= LAST_DMA_LINE && ((raster_y & 7) == y_scroll) && bad_lines_enabled; |
411 |
vd->bad_line_enable = bad_lines_enabled; |
412 |
vd->lp_triggered = lp_triggered; |
413 |
vd->border_on = border_on; |
414 |
|
415 |
vd->bank_base = cia_vabase; |
416 |
vd->matrix_base = ((vbase & 0xf0) << 6) | cia_vabase; |
417 |
vd->char_base = ((vbase & 0x0e) << 10) | cia_vabase; |
418 |
vd->bitmap_base = ((vbase & 0x08) << 10) | cia_vabase; |
419 |
for (i=0; i<8; i++) |
420 |
vd->sprite_base[i] = spr_ptr[i] | cia_vabase; |
421 |
|
422 |
vd->cycle = cycle; |
423 |
vd->raster_x = raster_x; |
424 |
vd->ml_index = ml_index; |
425 |
vd->ref_cnt = ref_cnt; |
426 |
vd->last_vic_byte = LastVICByte; |
427 |
vd->ud_border_on = ud_border_on; |
428 |
} |
429 |
|
430 |
|
431 |
/* |
432 |
* Set VIC state (only works if in VBlank) |
433 |
*/ |
434 |
|
435 |
void MOS6569::SetState(MOS6569State *vd) |
436 |
{ |
437 |
int i, j; |
438 |
|
439 |
mx[0] = vd->m0x; my[0] = vd->m0y; |
440 |
mx[1] = vd->m1x; my[1] = vd->m1y; |
441 |
mx[2] = vd->m2x; my[2] = vd->m2y; |
442 |
mx[3] = vd->m3x; my[3] = vd->m3y; |
443 |
mx[4] = vd->m4x; my[4] = vd->m4y; |
444 |
mx[5] = vd->m5x; my[5] = vd->m5y; |
445 |
mx[6] = vd->m6x; my[6] = vd->m6y; |
446 |
mx[7] = vd->m7x; my[7] = vd->m7y; |
447 |
mx8 = vd->mx8; |
448 |
for (i=0, j=1; i<8; i++, j<<=1) { |
449 |
if (mx8 & j) |
450 |
mx[i] |= 0x100; |
451 |
else |
452 |
mx[i] &= 0xff; |
453 |
} |
454 |
|
455 |
ctrl1 = vd->ctrl1; |
456 |
ctrl2 = vd->ctrl2; |
457 |
x_scroll = ctrl2 & 7; |
458 |
y_scroll = ctrl1 & 7; |
459 |
if (ctrl1 & 8) { |
460 |
dy_start = ROW25_YSTART; |
461 |
dy_stop = ROW25_YSTOP; |
462 |
} else { |
463 |
dy_start = ROW24_YSTART; |
464 |
dy_stop = ROW24_YSTOP; |
465 |
} |
466 |
display_idx = ((ctrl1 & 0x60) | (ctrl2 & 0x10)) >> 4; |
467 |
|
468 |
raster_y = 0; |
469 |
lpx = vd->lpx; lpy = vd->lpy; |
470 |
|
471 |
vbase = vd->vbase; |
472 |
cia_vabase = vd->bank_base; |
473 |
matrix_base = (vbase & 0xf0) << 6; |
474 |
char_base = (vbase & 0x0e) << 10; |
475 |
bitmap_base = (vbase & 0x08) << 10; |
476 |
|
477 |
irq_flag = vd->irq_flag; |
478 |
irq_mask = vd->irq_mask; |
479 |
|
480 |
me = vd->me; mxe = vd->mxe; mye = vd->mye; mdp = vd->mdp; mmc = vd->mmc; |
481 |
clx_spr = vd->mm; clx_bgr = vd->md; |
482 |
|
483 |
ec = vd->ec; |
484 |
ec_color = colors[ec]; |
485 |
|
486 |
b0c = vd->b0c; b1c = vd->b1c; b2c = vd->b2c; b3c = vd->b3c; |
487 |
b0c_color = colors[b0c]; |
488 |
b1c_color = colors[b1c]; |
489 |
b2c_color = colors[b2c]; |
490 |
b3c_color = colors[b3c]; |
491 |
|
492 |
mm0 = vd->mm0; mm1 = vd->mm1; |
493 |
mm0_color = colors[mm0]; |
494 |
mm1_color = colors[mm1]; |
495 |
|
496 |
sc[0] = vd->m0c; sc[1] = vd->m1c; |
497 |
sc[2] = vd->m2c; sc[3] = vd->m3c; |
498 |
sc[4] = vd->m4c; sc[5] = vd->m5c; |
499 |
sc[6] = vd->m6c; sc[7] = vd->m7c; |
500 |
for (i=0; i<8; i++) |
501 |
spr_color[i] = colors[sc[i]]; |
502 |
|
503 |
irq_raster = vd->irq_raster; |
504 |
vc = vd->vc; |
505 |
vc_base = vd->vc_base; |
506 |
rc = vd->rc; |
507 |
spr_dma_on = vd->spr_dma; |
508 |
spr_disp_on = vd->spr_disp; |
509 |
for (i=0; i<8; i++) { |
510 |
mc[i] = vd->mc[i]; |
511 |
mc_base[i] = vd->mc_base[i]; |
512 |
spr_ptr[i] = vd->sprite_base[i] & 0x3fff; |
513 |
} |
514 |
display_state = vd->display_state; |
515 |
bad_lines_enabled = vd->bad_line_enable; |
516 |
lp_triggered = vd->lp_triggered; |
517 |
border_on = vd->border_on; |
518 |
|
519 |
cycle = vd->cycle; |
520 |
raster_x = vd->raster_x; |
521 |
ml_index = vd->ml_index; |
522 |
ref_cnt = vd->ref_cnt; |
523 |
LastVICByte = vd->last_vic_byte; |
524 |
ud_border_on = vd->ud_border_on; |
525 |
} |
526 |
|
527 |
|
528 |
/* |
529 |
* Trigger raster IRQ |
530 |
*/ |
531 |
|
532 |
#ifdef GLOBAL_VARS |
533 |
static inline void raster_irq(void) |
534 |
#else |
535 |
inline void MOS6569::raster_irq(void) |
536 |
#endif |
537 |
{ |
538 |
irq_flag |= 0x01; |
539 |
if (irq_mask & 0x01) { |
540 |
irq_flag |= 0x80; |
541 |
the_cpu->TriggerVICIRQ(); |
542 |
} |
543 |
} |
544 |
|
545 |
|
546 |
/* |
547 |
* Read from VIC register |
548 |
*/ |
549 |
|
550 |
uint8 MOS6569::ReadRegister(uint16 adr) |
551 |
{ |
552 |
switch (adr) { |
553 |
case 0x00: case 0x02: case 0x04: case 0x06: |
554 |
case 0x08: case 0x0a: case 0x0c: case 0x0e: |
555 |
return mx[adr >> 1]; |
556 |
|
557 |
case 0x01: case 0x03: case 0x05: case 0x07: |
558 |
case 0x09: case 0x0b: case 0x0d: case 0x0f: |
559 |
return my[adr >> 1]; |
560 |
|
561 |
case 0x10: // Sprite X position MSB |
562 |
return mx8; |
563 |
|
564 |
case 0x11: // Control register 1 |
565 |
return (ctrl1 & 0x7f) | ((raster_y & 0x100) >> 1); |
566 |
|
567 |
case 0x12: // Raster counter |
568 |
return raster_y; |
569 |
|
570 |
case 0x13: // Light pen X |
571 |
return lpx; |
572 |
|
573 |
case 0x14: // Light pen Y |
574 |
return lpy; |
575 |
|
576 |
case 0x15: // Sprite enable |
577 |
return me; |
578 |
|
579 |
case 0x16: // Control register 2 |
580 |
return ctrl2 | 0xc0; |
581 |
|
582 |
case 0x17: // Sprite Y expansion |
583 |
return mye; |
584 |
|
585 |
case 0x18: // Memory pointers |
586 |
return vbase | 0x01; |
587 |
|
588 |
case 0x19: // IRQ flags |
589 |
return irq_flag | 0x70; |
590 |
|
591 |
case 0x1a: // IRQ mask |
592 |
return irq_mask | 0xf0; |
593 |
|
594 |
case 0x1b: // Sprite data priority |
595 |
return mdp; |
596 |
|
597 |
case 0x1c: // Sprite multicolor |
598 |
return mmc; |
599 |
|
600 |
case 0x1d: // Sprite X expansion |
601 |
return mxe; |
602 |
|
603 |
case 0x1e:{ // Sprite-sprite collision |
604 |
uint8 ret = clx_spr; |
605 |
clx_spr = 0; // Read and clear |
606 |
return ret; |
607 |
} |
608 |
|
609 |
case 0x1f:{ // Sprite-background collision |
610 |
uint8 ret = clx_bgr; |
611 |
clx_bgr = 0; // Read and clear |
612 |
return ret; |
613 |
} |
614 |
|
615 |
case 0x20: return ec | 0xf0; |
616 |
case 0x21: return b0c | 0xf0; |
617 |
case 0x22: return b1c | 0xf0; |
618 |
case 0x23: return b2c | 0xf0; |
619 |
case 0x24: return b3c | 0xf0; |
620 |
case 0x25: return mm0 | 0xf0; |
621 |
case 0x26: return mm1 | 0xf0; |
622 |
|
623 |
case 0x27: case 0x28: case 0x29: case 0x2a: |
624 |
case 0x2b: case 0x2c: case 0x2d: case 0x2e: |
625 |
return sc[adr - 0x27] | 0xf0; |
626 |
|
627 |
default: |
628 |
return 0xff; |
629 |
} |
630 |
} |
631 |
|
632 |
|
633 |
/* |
634 |
* Write to VIC register |
635 |
*/ |
636 |
|
637 |
void MOS6569::WriteRegister(uint16 adr, uint8 byte) |
638 |
{ |
639 |
switch (adr) { |
640 |
case 0x00: case 0x02: case 0x04: case 0x06: |
641 |
case 0x08: case 0x0a: case 0x0c: case 0x0e: |
642 |
mx[adr >> 1] = (mx[adr >> 1] & 0xff00) | byte; |
643 |
break; |
644 |
|
645 |
case 0x10:{ |
646 |
int i, j; |
647 |
mx8 = byte; |
648 |
for (i=0, j=1; i<8; i++, j<<=1) { |
649 |
if (mx8 & j) |
650 |
mx[i] |= 0x100; |
651 |
else |
652 |
mx[i] &= 0xff; |
653 |
} |
654 |
break; |
655 |
} |
656 |
|
657 |
case 0x01: case 0x03: case 0x05: case 0x07: |
658 |
case 0x09: case 0x0b: case 0x0d: case 0x0f: |
659 |
my[adr >> 1] = byte; |
660 |
break; |
661 |
|
662 |
case 0x11:{ // Control register 1 |
663 |
ctrl1 = byte; |
664 |
y_scroll = byte & 7; |
665 |
|
666 |
uint16 new_irq_raster = (irq_raster & 0xff) | ((byte & 0x80) << 1); |
667 |
if (irq_raster != new_irq_raster && raster_y == new_irq_raster) |
668 |
raster_irq(); |
669 |
irq_raster = new_irq_raster; |
670 |
|
671 |
if (byte & 8) { |
672 |
dy_start = ROW25_YSTART; |
673 |
dy_stop = ROW25_YSTOP; |
674 |
} else { |
675 |
dy_start = ROW24_YSTART; |
676 |
dy_stop = ROW24_YSTOP; |
677 |
} |
678 |
|
679 |
// In line $30, the DEN bit controls if Bad Lines can occur |
680 |
if (raster_y == 0x30 && byte & 0x10) |
681 |
bad_lines_enabled = true; |
682 |
|
683 |
// Bad Line condition? |
684 |
is_bad_line = (raster_y >= FIRST_DMA_LINE && raster_y <= LAST_DMA_LINE && ((raster_y & 7) == y_scroll) && bad_lines_enabled); |
685 |
|
686 |
display_idx = ((ctrl1 & 0x60) | (ctrl2 & 0x10)) >> 4; |
687 |
break; |
688 |
} |
689 |
|
690 |
case 0x12:{ // Raster counter |
691 |
uint16 new_irq_raster = (irq_raster & 0xff00) | byte; |
692 |
if (irq_raster != new_irq_raster && raster_y == new_irq_raster) |
693 |
raster_irq(); |
694 |
irq_raster = new_irq_raster; |
695 |
break; |
696 |
} |
697 |
|
698 |
case 0x15: // Sprite enable |
699 |
me = byte; |
700 |
break; |
701 |
|
702 |
case 0x16: // Control register 2 |
703 |
ctrl2 = byte; |
704 |
x_scroll = byte & 7; |
705 |
display_idx = ((ctrl1 & 0x60) | (ctrl2 & 0x10)) >> 4; |
706 |
break; |
707 |
|
708 |
case 0x17: // Sprite Y expansion |
709 |
mye = byte; |
710 |
spr_exp_y |= ~byte; |
711 |
break; |
712 |
|
713 |
case 0x18: // Memory pointers |
714 |
vbase = byte; |
715 |
matrix_base = (byte & 0xf0) << 6; |
716 |
char_base = (byte & 0x0e) << 10; |
717 |
bitmap_base = (byte & 0x08) << 10; |
718 |
break; |
719 |
|
720 |
case 0x19: // IRQ flags |
721 |
irq_flag = irq_flag & (~byte & 0x0f); |
722 |
if (irq_flag & irq_mask) // Set master bit if allowed interrupt still pending |
723 |
irq_flag |= 0x80; |
724 |
else |
725 |
the_cpu->ClearVICIRQ(); // Else clear interrupt |
726 |
break; |
727 |
|
728 |
case 0x1a: // IRQ mask |
729 |
irq_mask = byte & 0x0f; |
730 |
if (irq_flag & irq_mask) { // Trigger interrupt if pending and now allowed |
731 |
irq_flag |= 0x80; |
732 |
the_cpu->TriggerVICIRQ(); |
733 |
} else { |
734 |
irq_flag &= 0x7f; |
735 |
the_cpu->ClearVICIRQ(); |
736 |
} |
737 |
break; |
738 |
|
739 |
case 0x1b: // Sprite data priority |
740 |
mdp = byte; |
741 |
break; |
742 |
|
743 |
case 0x1c: // Sprite multicolor |
744 |
mmc = byte; |
745 |
break; |
746 |
|
747 |
case 0x1d: // Sprite X expansion |
748 |
mxe = byte; |
749 |
break; |
750 |
|
751 |
case 0x20: ec_color = colors[ec = byte]; break; |
752 |
case 0x21: b0c_color = colors[b0c = byte]; break; |
753 |
case 0x22: b1c_color = colors[b1c = byte]; break; |
754 |
case 0x23: b2c_color = colors[b2c = byte]; break; |
755 |
case 0x24: b3c_color = colors[b3c = byte]; break; |
756 |
case 0x25: mm0_color = colors[mm0 = byte]; break; |
757 |
case 0x26: mm1_color = colors[mm1 = byte]; break; |
758 |
|
759 |
case 0x27: case 0x28: case 0x29: case 0x2a: |
760 |
case 0x2b: case 0x2c: case 0x2d: case 0x2e: |
761 |
spr_color[adr - 0x27] = colors[sc[adr - 0x27] = byte]; |
762 |
break; |
763 |
} |
764 |
} |
765 |
|
766 |
|
767 |
/* |
768 |
* CIA VA14/15 has changed |
769 |
*/ |
770 |
|
771 |
void MOS6569::ChangedVA(uint16 new_va) |
772 |
{ |
773 |
cia_vabase = new_va << 14; |
774 |
WriteRegister(0x18, vbase); // Force update of memory pointers |
775 |
} |
776 |
|
777 |
|
778 |
/* |
779 |
* Trigger lightpen interrupt, latch lightpen coordinates |
780 |
*/ |
781 |
|
782 |
void MOS6569::TriggerLightpen(void) |
783 |
{ |
784 |
if (!lp_triggered) { // Lightpen triggers only once per frame |
785 |
lp_triggered = true; |
786 |
|
787 |
lpx = raster_x >> 1; // Latch current coordinates |
788 |
lpy = raster_y; |
789 |
|
790 |
irq_flag |= 0x08; // Trigger IRQ |
791 |
if (irq_mask & 0x08) { |
792 |
irq_flag |= 0x80; |
793 |
the_cpu->TriggerVICIRQ(); |
794 |
} |
795 |
} |
796 |
} |
797 |
|
798 |
|
799 |
/* |
800 |
* Read a byte from the VIC's address space |
801 |
*/ |
802 |
|
803 |
#ifdef GLOBAL_VARS |
804 |
static inline uint8 read_byte(uint16 adr) |
805 |
#else |
806 |
inline uint8 MOS6569::read_byte(uint16 adr) |
807 |
#endif |
808 |
{ |
809 |
uint16 va = adr | cia_vabase; |
810 |
if ((va & 0x7000) == 0x1000) |
811 |
#ifdef GLOBAL_VARS |
812 |
return the_vic->LastVICByte = char_rom[va & 0x0fff]; |
813 |
#else |
814 |
return LastVICByte = char_rom[va & 0x0fff]; |
815 |
#endif |
816 |
else |
817 |
#ifdef GLOBAL_VARS |
818 |
return the_vic->LastVICByte = ram[va]; |
819 |
#else |
820 |
return LastVICByte = ram[va]; |
821 |
#endif |
822 |
} |
823 |
|
824 |
|
825 |
/* |
826 |
* Quick memset of 8 bytes |
827 |
*/ |
828 |
|
829 |
inline void memset8(uint8 *p, uint8 c) |
830 |
{ |
831 |
p[0] = p[1] = p[2] = p[3] = p[4] = p[5] = p[6] = p[7] = c; |
832 |
} |
833 |
|
834 |
|
835 |
/* |
836 |
* Video matrix access |
837 |
*/ |
838 |
|
839 |
#ifdef __i386 |
840 |
inline |
841 |
#endif |
842 |
#ifdef GLOBAL_VARS |
843 |
static void matrix_access(void) |
844 |
#else |
845 |
void MOS6569::matrix_access(void) |
846 |
#endif |
847 |
{ |
848 |
if (the_cpu->BALow) { |
849 |
if (the_c64->CycleCounter-first_ba_cycle < 3) |
850 |
matrix_line[ml_index] = color_line[ml_index] = 0xff; |
851 |
else { |
852 |
uint16 adr = (vc & 0x03ff) | matrix_base; |
853 |
matrix_line[ml_index] = read_byte(adr); |
854 |
color_line[ml_index] = color_ram[adr & 0x03ff]; |
855 |
} |
856 |
} |
857 |
} |
858 |
|
859 |
|
860 |
/* |
861 |
* Graphics data access |
862 |
*/ |
863 |
|
864 |
#ifdef __i386 |
865 |
inline |
866 |
#endif |
867 |
#ifdef GLOBAL_VARS |
868 |
static void graphics_access(void) |
869 |
#else |
870 |
void MOS6569::graphics_access(void) |
871 |
#endif |
872 |
{ |
873 |
if (display_state) { |
874 |
|
875 |
uint16 adr; |
876 |
if (ctrl1 & 0x20) // Bitmap |
877 |
adr = ((vc & 0x03ff) << 3) | bitmap_base | rc; |
878 |
else // Text |
879 |
adr = (matrix_line[ml_index] << 3) | char_base | rc; |
880 |
if (ctrl1 & 0x40) // ECM |
881 |
adr &= 0xf9ff; |
882 |
gfx_data = read_byte(adr); |
883 |
char_data = matrix_line[ml_index]; |
884 |
color_data = color_line[ml_index]; |
885 |
ml_index++; |
886 |
vc++; |
887 |
|
888 |
} else { |
889 |
|
890 |
// Display is off |
891 |
gfx_data = read_byte(ctrl1 & 0x40 ? 0x39ff : 0x3fff); |
892 |
char_data = color_data = 0; |
893 |
} |
894 |
} |
895 |
|
896 |
|
897 |
/* |
898 |
* Background display (8 pixels) |
899 |
*/ |
900 |
|
901 |
#ifdef GLOBAL_VARS |
902 |
static void draw_background(void) |
903 |
#else |
904 |
void MOS6569::draw_background(void) |
905 |
#endif |
906 |
{ |
907 |
uint8 *p = chunky_ptr; |
908 |
uint8 c; |
909 |
|
910 |
if (!draw_this_line) |
911 |
return; |
912 |
|
913 |
switch (display_idx) { |
914 |
case 0: // Standard text |
915 |
case 1: // Multicolor text |
916 |
case 3: // Multicolor bitmap |
917 |
c = b0c_color; |
918 |
break; |
919 |
case 2: // Standard bitmap |
920 |
c = colors[last_char_data]; |
921 |
break; |
922 |
case 4: // ECM text |
923 |
if (last_char_data & 0x80) |
924 |
if (last_char_data & 0x40) |
925 |
c = b3c_color; |
926 |
else |
927 |
c = b2c_color; |
928 |
else |
929 |
if (last_char_data & 0x40) |
930 |
c = b1c_color; |
931 |
else |
932 |
c = b0c_color; |
933 |
break; |
934 |
default: |
935 |
c = colors[0]; |
936 |
break; |
937 |
} |
938 |
memset8(p, c); |
939 |
} |
940 |
|
941 |
|
942 |
/* |
943 |
* Graphics display (8 pixels) |
944 |
*/ |
945 |
|
946 |
#ifdef __i386 |
947 |
inline |
948 |
#endif |
949 |
#ifdef GLOBAL_VARS |
950 |
static void draw_graphics(void) |
951 |
#else |
952 |
void MOS6569::draw_graphics(void) |
953 |
#endif |
954 |
{ |
955 |
uint8 *p = chunky_ptr + x_scroll; |
956 |
uint8 c[4], data; |
957 |
|
958 |
if (!draw_this_line) |
959 |
return; |
960 |
if (ud_border_on) { |
961 |
draw_background(); |
962 |
return; |
963 |
} |
964 |
|
965 |
switch (display_idx) { |
966 |
|
967 |
case 0: // Standard text |
968 |
c[0] = b0c_color; |
969 |
c[1] = colors[color_data]; |
970 |
goto draw_std; |
971 |
|
972 |
case 1: // Multicolor text |
973 |
if (color_data & 8) { |
974 |
c[0] = b0c_color; |
975 |
c[1] = b1c_color; |
976 |
c[2] = b2c_color; |
977 |
c[3] = colors[color_data & 7]; |
978 |
goto draw_multi; |
979 |
} else { |
980 |
c[0] = b0c_color; |
981 |
c[1] = colors[color_data]; |
982 |
goto draw_std; |
983 |
} |
984 |
|
985 |
case 2: // Standard bitmap |
986 |
c[0] = colors[char_data]; |
987 |
c[1] = colors[char_data >> 4]; |
988 |
goto draw_std; |
989 |
|
990 |
case 3: // Multicolor bitmap |
991 |
c[0]= b0c_color; |
992 |
c[1] = colors[char_data >> 4]; |
993 |
c[2] = colors[char_data]; |
994 |
c[3] = colors[color_data]; |
995 |
goto draw_multi; |
996 |
|
997 |
case 4: // ECM text |
998 |
if (char_data & 0x80) |
999 |
if (char_data & 0x40) |
1000 |
c[0] = b3c_color; |
1001 |
else |
1002 |
c[0] = b2c_color; |
1003 |
else |
1004 |
if (char_data & 0x40) |
1005 |
c[0] = b1c_color; |
1006 |
else |
1007 |
c[0] = b0c_color; |
1008 |
c[1] = colors[color_data]; |
1009 |
goto draw_std; |
1010 |
|
1011 |
case 5: // Invalid multicolor text |
1012 |
memset8(p, colors[0]); |
1013 |
if (color_data & 8) { |
1014 |
fore_mask_ptr[0] |= ((gfx_data & 0xaa) | (gfx_data & 0xaa) >> 1) >> x_scroll; |
1015 |
fore_mask_ptr[1] |= ((gfx_data & 0xaa) | (gfx_data & 0xaa) >> 1) << (8-x_scroll); |
1016 |
} else { |
1017 |
fore_mask_ptr[0] |= gfx_data >> x_scroll; |
1018 |
fore_mask_ptr[1] |= gfx_data << (7-x_scroll); |
1019 |
} |
1020 |
return; |
1021 |
|
1022 |
case 6: // Invalid standard bitmap |
1023 |
memset8(p, colors[0]); |
1024 |
fore_mask_ptr[0] |= gfx_data >> x_scroll; |
1025 |
fore_mask_ptr[1] |= gfx_data << (7-x_scroll); |
1026 |
return; |
1027 |
|
1028 |
case 7: // Invalid multicolor bitmap |
1029 |
memset8(p, colors[0]); |
1030 |
fore_mask_ptr[0] |= ((gfx_data & 0xaa) | (gfx_data & 0xaa) >> 1) >> x_scroll; |
1031 |
fore_mask_ptr[1] |= ((gfx_data & 0xaa) | (gfx_data & 0xaa) >> 1) << (8-x_scroll); |
1032 |
return; |
1033 |
|
1034 |
default: // Can't happen |
1035 |
return; |
1036 |
} |
1037 |
|
1038 |
draw_std: |
1039 |
|
1040 |
fore_mask_ptr[0] |= gfx_data >> x_scroll; |
1041 |
fore_mask_ptr[1] |= gfx_data << (7-x_scroll); |
1042 |
|
1043 |
data = gfx_data; |
1044 |
p[7] = c[data & 1]; data >>= 1; |
1045 |
p[6] = c[data & 1]; data >>= 1; |
1046 |
p[5] = c[data & 1]; data >>= 1; |
1047 |
p[4] = c[data & 1]; data >>= 1; |
1048 |
p[3] = c[data & 1]; data >>= 1; |
1049 |
p[2] = c[data & 1]; data >>= 1; |
1050 |
p[1] = c[data & 1]; data >>= 1; |
1051 |
p[0] = c[data]; |
1052 |
return; |
1053 |
|
1054 |
draw_multi: |
1055 |
|
1056 |
fore_mask_ptr[0] |= ((gfx_data & 0xaa) | (gfx_data & 0xaa) >> 1) >> x_scroll; |
1057 |
fore_mask_ptr[1] |= ((gfx_data & 0xaa) | (gfx_data & 0xaa) >> 1) << (8-x_scroll); |
1058 |
|
1059 |
data = gfx_data; |
1060 |
p[7] = p[6] = c[data & 3]; data >>= 2; |
1061 |
p[5] = p[4] = c[data & 3]; data >>= 2; |
1062 |
p[3] = p[2] = c[data & 3]; data >>= 2; |
1063 |
p[1] = p[0] = c[data]; |
1064 |
return; |
1065 |
} |
1066 |
|
1067 |
|
1068 |
/* |
1069 |
* Sprite display |
1070 |
*/ |
1071 |
|
1072 |
#ifdef GLOBAL_VARS |
1073 |
inline static void draw_sprites(void) |
1074 |
#else |
1075 |
inline void MOS6569::draw_sprites(void) |
1076 |
#endif |
1077 |
{ |
1078 |
int i; |
1079 |
int snum, sbit; // Sprite number/bit mask |
1080 |
int spr_coll=0, gfx_coll=0; |
1081 |
|
1082 |
// Clear sprite collision buffer |
1083 |
{ |
1084 |
uint32 *lp = (uint32 *)spr_coll_buf - 1; |
1085 |
for (i=0; i<DISPLAY_X/4; i++) |
1086 |
*++lp = 0; |
1087 |
} |
1088 |
|
1089 |
// Loop for all sprites |
1090 |
for (snum=0, sbit=1; snum<8; snum++, sbit<<=1) { |
1091 |
|
1092 |
// Is sprite visible? |
1093 |
if ((spr_draw & sbit) && mx[snum] <= DISPLAY_X-32) { |
1094 |
#ifdef __POWERPC__ |
1095 |
uint8 *p = (uint8 *)chunky_tmp + mx[snum] + 8; |
1096 |
#else |
1097 |
uint8 *p = chunky_line_start + mx[snum] + 8; |
1098 |
#endif |
1099 |
uint8 *q = spr_coll_buf + mx[snum] + 8; |
1100 |
uint8 color = spr_color[snum]; |
1101 |
|
1102 |
// Fetch sprite data and mask |
1103 |
uint32 sdata = (spr_draw_data[snum][0] << 24) | (spr_draw_data[snum][1] << 16) | (spr_draw_data[snum][2] << 8); |
1104 |
|
1105 |
int spr_mask_pos = mx[snum] + 8; // Sprite bit position in fore_mask_buf |
1106 |
|
1107 |
uint8 *fmbp = fore_mask_buf + (spr_mask_pos / 8); |
1108 |
int sshift = spr_mask_pos & 7; |
1109 |
uint32 fore_mask = (((*(fmbp+0) << 24) | (*(fmbp+1) << 16) | (*(fmbp+2) << 8) |
1110 |
| (*(fmbp+3))) << sshift) | (*(fmbp+4) >> (8-sshift)); |
1111 |
|
1112 |
if (mxe & sbit) { // X-expanded |
1113 |
if (mx[snum] > DISPLAY_X-56) |
1114 |
continue; |
1115 |
|
1116 |
uint32 sdata_l = 0, sdata_r = 0, fore_mask_r; |
1117 |
fore_mask_r = (((*(fmbp+4) << 24) | (*(fmbp+5) << 16) | (*(fmbp+6) << 8) |
1118 |
| (*(fmbp+7))) << sshift) | (*(fmbp+8) >> (8-sshift)); |
1119 |
|
1120 |
if (mmc & sbit) { // Multicolor mode |
1121 |
uint32 plane0_l, plane0_r, plane1_l, plane1_r; |
1122 |
|
1123 |
// Expand sprite data |
1124 |
sdata_l = MultiExpTable[sdata >> 24 & 0xff] << 16 | MultiExpTable[sdata >> 16 & 0xff]; |
1125 |
sdata_r = MultiExpTable[sdata >> 8 & 0xff] << 16; |
1126 |
|
1127 |
// Convert sprite chunky pixels to bitplanes |
1128 |
plane0_l = (sdata_l & 0x55555555) | (sdata_l & 0x55555555) << 1; |
1129 |
plane1_l = (sdata_l & 0xaaaaaaaa) | (sdata_l & 0xaaaaaaaa) >> 1; |
1130 |
plane0_r = (sdata_r & 0x55555555) | (sdata_r & 0x55555555) << 1; |
1131 |
plane1_r = (sdata_r & 0xaaaaaaaa) | (sdata_r & 0xaaaaaaaa) >> 1; |
1132 |
|
1133 |
// Collision with graphics? |
1134 |
if ((fore_mask & (plane0_l | plane1_l)) || (fore_mask_r & (plane0_r | plane1_r))) { |
1135 |
gfx_coll |= sbit; |
1136 |
if (mdp & sbit) { |
1137 |
plane0_l &= ~fore_mask; // Mask sprite if in background |
1138 |
plane1_l &= ~fore_mask; |
1139 |
plane0_r &= ~fore_mask_r; |
1140 |
plane1_r &= ~fore_mask_r; |
1141 |
} |
1142 |
} |
1143 |
|
1144 |
// Paint sprite |
1145 |
for (i=0; i<32; i++, plane0_l<<=1, plane1_l<<=1) { |
1146 |
uint8 col; |
1147 |
if (plane1_l & 0x80000000) { |
1148 |
if (plane0_l & 0x80000000) |
1149 |
col = mm1_color; |
1150 |
else |
1151 |
col = color; |
1152 |
} else { |
1153 |
if (plane0_l & 0x80000000) |
1154 |
col = mm0_color; |
1155 |
else |
1156 |
continue; |
1157 |
} |
1158 |
if (q[i]) |
1159 |
spr_coll |= q[i] | sbit; |
1160 |
else { |
1161 |
p[i] = col; |
1162 |
q[i] = sbit; |
1163 |
} |
1164 |
} |
1165 |
for (; i<48; i++, plane0_r<<=1, plane1_r<<=1) { |
1166 |
uint8 col; |
1167 |
if (plane1_r & 0x80000000) { |
1168 |
if (plane0_r & 0x80000000) |
1169 |
col = mm1_color; |
1170 |
else |
1171 |
col = color; |
1172 |
} else { |
1173 |
if (plane0_r & 0x80000000) |
1174 |
col = mm0_color; |
1175 |
else |
1176 |
continue; |
1177 |
} |
1178 |
if (q[i]) |
1179 |
spr_coll |= q[i] | sbit; |
1180 |
else { |
1181 |
p[i] = col; |
1182 |
q[i] = sbit; |
1183 |
} |
1184 |
} |
1185 |
|
1186 |
} else { // Standard mode |
1187 |
|
1188 |
// Expand sprite data |
1189 |
sdata_l = ExpTable[sdata >> 24 & 0xff] << 16 | ExpTable[sdata >> 16 & 0xff]; |
1190 |
sdata_r = ExpTable[sdata >> 8 & 0xff] << 16; |
1191 |
|
1192 |
// Collision with graphics? |
1193 |
if ((fore_mask & sdata_l) || (fore_mask_r & sdata_r)) { |
1194 |
gfx_coll |= sbit; |
1195 |
if (mdp & sbit) { |
1196 |
sdata_l &= ~fore_mask; // Mask sprite if in background |
1197 |
sdata_r &= ~fore_mask_r; |
1198 |
} |
1199 |
} |
1200 |
|
1201 |
// Paint sprite |
1202 |
for (i=0; i<32; i++, sdata_l<<=1) |
1203 |
if (sdata_l & 0x80000000) { |
1204 |
if (q[i]) // Collision with sprite? |
1205 |
spr_coll |= q[i] | sbit; |
1206 |
else { // Draw pixel if no collision |
1207 |
p[i] = color; |
1208 |
q[i] = sbit; |
1209 |
} |
1210 |
} |
1211 |
for (; i<48; i++, sdata_r<<=1) |
1212 |
if (sdata_r & 0x80000000) { |
1213 |
if (q[i]) // Collision with sprite? |
1214 |
spr_coll |= q[i] | sbit; |
1215 |
else { // Draw pixel if no collision |
1216 |
p[i] = color; |
1217 |
q[i] = sbit; |
1218 |
} |
1219 |
} |
1220 |
} |
1221 |
|
1222 |
} else { // Unexpanded |
1223 |
|
1224 |
if (mmc & sbit) { // Multicolor mode |
1225 |
uint32 plane0, plane1; |
1226 |
|
1227 |
// Convert sprite chunky pixels to bitplanes |
1228 |
plane0 = (sdata & 0x55555555) | (sdata & 0x55555555) << 1; |
1229 |
plane1 = (sdata & 0xaaaaaaaa) | (sdata & 0xaaaaaaaa) >> 1; |
1230 |
|
1231 |
// Collision with graphics? |
1232 |
if (fore_mask & (plane0 | plane1)) { |
1233 |
gfx_coll |= sbit; |
1234 |
if (mdp & sbit) { |
1235 |
plane0 &= ~fore_mask; // Mask sprite if in background |
1236 |
plane1 &= ~fore_mask; |
1237 |
} |
1238 |
} |
1239 |
|
1240 |
// Paint sprite |
1241 |
for (i=0; i<24; i++, plane0<<=1, plane1<<=1) { |
1242 |
uint8 col; |
1243 |
if (plane1 & 0x80000000) { |
1244 |
if (plane0 & 0x80000000) |
1245 |
col = mm1_color; |
1246 |
else |
1247 |
col = color; |
1248 |
} else { |
1249 |
if (plane0 & 0x80000000) |
1250 |
col = mm0_color; |
1251 |
else |
1252 |
continue; |
1253 |
} |
1254 |
if (q[i]) |
1255 |
spr_coll |= q[i] | sbit; |
1256 |
else { |
1257 |
p[i] = col; |
1258 |
q[i] = sbit; |
1259 |
} |
1260 |
} |
1261 |
|
1262 |
} else { // Standard mode |
1263 |
|
1264 |
// Collision with graphics? |
1265 |
if (fore_mask & sdata) { |
1266 |
gfx_coll |= sbit; |
1267 |
if (mdp & sbit) |
1268 |
sdata &= ~fore_mask; // Mask sprite if in background |
1269 |
} |
1270 |
|
1271 |
// Paint sprite |
1272 |
for (i=0; i<24; i++, sdata<<=1) |
1273 |
if (sdata & 0x80000000) { |
1274 |
if (q[i]) { // Collision with sprite? |
1275 |
spr_coll |= q[i] | sbit; |
1276 |
} else { // Draw pixel if no collision |
1277 |
p[i] = color; |
1278 |
q[i] = sbit; |
1279 |
} |
1280 |
} |
1281 |
} |
1282 |
} |
1283 |
} |
1284 |
} |
1285 |
|
1286 |
if (ThePrefs.SpriteCollisions) { |
1287 |
|
1288 |
// Check sprite-sprite collisions |
1289 |
if (clx_spr) |
1290 |
clx_spr |= spr_coll; |
1291 |
else { |
1292 |
clx_spr |= spr_coll; |
1293 |
irq_flag |= 0x04; |
1294 |
if (irq_mask & 0x04) { |
1295 |
irq_flag |= 0x80; |
1296 |
the_cpu->TriggerVICIRQ(); |
1297 |
} |
1298 |
} |
1299 |
|
1300 |
// Check sprite-background collisions |
1301 |
if (clx_bgr) |
1302 |
clx_bgr |= gfx_coll; |
1303 |
else { |
1304 |
clx_bgr |= gfx_coll; |
1305 |
irq_flag |= 0x02; |
1306 |
if (irq_mask & 0x02) { |
1307 |
irq_flag |= 0x80; |
1308 |
the_cpu->TriggerVICIRQ(); |
1309 |
} |
1310 |
} |
1311 |
} |
1312 |
} |
1313 |
|
1314 |
|
1315 |
#ifdef __POWERPC__ |
1316 |
static asm void fastcopy(register uchar *dst, register uchar *src); |
1317 |
static asm void fastcopy(register uchar *dst, register uchar *src) |
1318 |
{ |
1319 |
lfd fp0,0(src) |
1320 |
lfd fp1,8(src) |
1321 |
lfd fp2,16(src) |
1322 |
lfd fp3,24(src) |
1323 |
lfd fp4,32(src) |
1324 |
lfd fp5,40(src) |
1325 |
lfd fp6,48(src) |
1326 |
lfd fp7,56(src) |
1327 |
addi src,src,64 |
1328 |
stfd fp0,0(dst) |
1329 |
stfd fp1,8(dst) |
1330 |
stfd fp2,16(dst) |
1331 |
stfd fp3,24(dst) |
1332 |
stfd fp4,32(dst) |
1333 |
stfd fp5,40(dst) |
1334 |
stfd fp6,48(dst) |
1335 |
stfd fp7,56(dst) |
1336 |
addi dst,dst,64 |
1337 |
|
1338 |
lfd fp0,0(src) |
1339 |
lfd fp1,8(src) |
1340 |
lfd fp2,16(src) |
1341 |
lfd fp3,24(src) |
1342 |
lfd fp4,32(src) |
1343 |
lfd fp5,40(src) |
1344 |
lfd fp6,48(src) |
1345 |
lfd fp7,56(src) |
1346 |
addi src,src,64 |
1347 |
stfd fp0,0(dst) |
1348 |
stfd fp1,8(dst) |
1349 |
stfd fp2,16(dst) |
1350 |
stfd fp3,24(dst) |
1351 |
stfd fp4,32(dst) |
1352 |
stfd fp5,40(dst) |
1353 |
stfd fp6,48(dst) |
1354 |
stfd fp7,56(dst) |
1355 |
addi dst,dst,64 |
1356 |
|
1357 |
lfd fp0,0(src) |
1358 |
lfd fp1,8(src) |
1359 |
lfd fp2,16(src) |
1360 |
lfd fp3,24(src) |
1361 |
lfd fp4,32(src) |
1362 |
lfd fp5,40(src) |
1363 |
lfd fp6,48(src) |
1364 |
lfd fp7,56(src) |
1365 |
addi src,src,64 |
1366 |
stfd fp0,0(dst) |
1367 |
stfd fp1,8(dst) |
1368 |
stfd fp2,16(dst) |
1369 |
stfd fp3,24(dst) |
1370 |
stfd fp4,32(dst) |
1371 |
stfd fp5,40(dst) |
1372 |
stfd fp6,48(dst) |
1373 |
stfd fp7,56(dst) |
1374 |
addi dst,dst,64 |
1375 |
|
1376 |
lfd fp0,0(src) |
1377 |
lfd fp1,8(src) |
1378 |
lfd fp2,16(src) |
1379 |
lfd fp3,24(src) |
1380 |
lfd fp4,32(src) |
1381 |
lfd fp5,40(src) |
1382 |
lfd fp6,48(src) |
1383 |
lfd fp7,56(src) |
1384 |
addi src,src,64 |
1385 |
stfd fp0,0(dst) |
1386 |
stfd fp1,8(dst) |
1387 |
stfd fp2,16(dst) |
1388 |
stfd fp3,24(dst) |
1389 |
stfd fp4,32(dst) |
1390 |
stfd fp5,40(dst) |
1391 |
stfd fp6,48(dst) |
1392 |
stfd fp7,56(dst) |
1393 |
addi dst,dst,64 |
1394 |
|
1395 |
lfd fp0,0(src) |
1396 |
lfd fp1,8(src) |
1397 |
lfd fp2,16(src) |
1398 |
lfd fp3,24(src) |
1399 |
lfd fp4,32(src) |
1400 |
lfd fp5,40(src) |
1401 |
lfd fp6,48(src) |
1402 |
lfd fp7,56(src) |
1403 |
addi src,src,64 |
1404 |
stfd fp0,0(dst) |
1405 |
stfd fp1,8(dst) |
1406 |
stfd fp2,16(dst) |
1407 |
stfd fp3,24(dst) |
1408 |
stfd fp4,32(dst) |
1409 |
stfd fp5,40(dst) |
1410 |
stfd fp6,48(dst) |
1411 |
stfd fp7,56(dst) |
1412 |
addi dst,dst,64 |
1413 |
|
1414 |
lfd fp0,0(src) |
1415 |
lfd fp1,8(src) |
1416 |
lfd fp2,16(src) |
1417 |
lfd fp3,24(src) |
1418 |
lfd fp4,32(src) |
1419 |
lfd fp5,40(src) |
1420 |
lfd fp6,48(src) |
1421 |
lfd fp7,56(src) |
1422 |
addi src,src,64 |
1423 |
stfd fp0,0(dst) |
1424 |
stfd fp1,8(dst) |
1425 |
stfd fp2,16(dst) |
1426 |
stfd fp3,24(dst) |
1427 |
stfd fp4,32(dst) |
1428 |
stfd fp5,40(dst) |
1429 |
stfd fp6,48(dst) |
1430 |
stfd fp7,56(dst) |
1431 |
addi dst,dst,64 |
1432 |
blr |
1433 |
} |
1434 |
#endif |
1435 |
|
1436 |
|
1437 |
/* |
1438 |
* Emulate one clock cycle, returns true if new raster line has started |
1439 |
*/ |
1440 |
|
1441 |
// Set BA low |
1442 |
#define SetBALow \ |
1443 |
if (!the_cpu->BALow) { \ |
1444 |
first_ba_cycle = the_c64->CycleCounter; \ |
1445 |
the_cpu->BALow = true; \ |
1446 |
} |
1447 |
|
1448 |
// Turn on display if Bad Line |
1449 |
#define DisplayIfBadLine \ |
1450 |
if (is_bad_line) \ |
1451 |
display_state = true; |
1452 |
|
1453 |
// Turn on display and matrix access if Bad Line |
1454 |
#define FetchIfBadLine \ |
1455 |
if (is_bad_line) { \ |
1456 |
display_state = true; \ |
1457 |
SetBALow; \ |
1458 |
} |
1459 |
|
1460 |
// Turn on display and matrix access and reset RC if Bad Line |
1461 |
#define RCIfBadLine \ |
1462 |
if (is_bad_line) { \ |
1463 |
display_state = true; \ |
1464 |
rc = 0; \ |
1465 |
SetBALow; \ |
1466 |
} |
1467 |
|
1468 |
// Idle access |
1469 |
#define IdleAccess \ |
1470 |
read_byte(0x3fff) |
1471 |
|
1472 |
// Refresh access |
1473 |
#define RefreshAccess \ |
1474 |
read_byte(0x3f00 | ref_cnt--) |
1475 |
|
1476 |
// Turn on sprite DMA if necessary |
1477 |
#define CheckSpriteDMA \ |
1478 |
mask = 1; \ |
1479 |
for (i=0; i<8; i++, mask<<=1) \ |
1480 |
if ((me & mask) && (raster_y & 0xff) == my[i]) { \ |
1481 |
spr_dma_on |= mask; \ |
1482 |
mc_base[i] = 0; \ |
1483 |
if (mye & mask) \ |
1484 |
spr_exp_y &= ~mask; \ |
1485 |
} |
1486 |
|
1487 |
// Fetch sprite data pointer |
1488 |
#define SprPtrAccess(num) \ |
1489 |
spr_ptr[num] = read_byte(matrix_base | 0x03f8 | num) << 6; |
1490 |
|
1491 |
// Fetch sprite data, increment data counter |
1492 |
#define SprDataAccess(num, bytenum) \ |
1493 |
if (spr_dma_on & (1 << num)) { \ |
1494 |
spr_data[num][bytenum] = read_byte(mc[num] & 0x3f | spr_ptr[num]); \ |
1495 |
mc[num]++; \ |
1496 |
} else if (bytenum == 1) \ |
1497 |
IdleAccess; |
1498 |
|
1499 |
// Sample border color and increment chunky_ptr and fore_mask_ptr |
1500 |
#define SampleBorder \ |
1501 |
if (draw_this_line) { \ |
1502 |
if (border_on) \ |
1503 |
border_color_sample[cycle-13] = ec_color; \ |
1504 |
chunky_ptr += 8; \ |
1505 |
fore_mask_ptr++; \ |
1506 |
} |
1507 |
|
1508 |
|
1509 |
bool MOS6569::EmulateCycle(void) |
1510 |
{ |
1511 |
uint8 mask; |
1512 |
int i; |
1513 |
|
1514 |
switch (cycle) { |
1515 |
|
1516 |
// Fetch sprite pointer 3, increment raster counter, trigger raster IRQ, |
1517 |
// test for Bad Line, reset BA if sprites 3 and 4 off, read data of sprite 3 |
1518 |
case 1: |
1519 |
if (raster_y == TOTAL_RASTERS-1) { |
1520 |
|
1521 |
// Trigger VBlank in cycle 2 |
1522 |
vblanking = true; |
1523 |
|
1524 |
} else { |
1525 |
|
1526 |
// Increment raster counter |
1527 |
raster_y++; |
1528 |
|
1529 |
// Trigger raster IRQ if IRQ line reached |
1530 |
if (raster_y == irq_raster) |
1531 |
raster_irq(); |
1532 |
|
1533 |
// In line $30, the DEN bit controls if Bad Lines can occur |
1534 |
if (raster_y == 0x30) |
1535 |
bad_lines_enabled = ctrl1 & 0x10; |
1536 |
|
1537 |
// Bad Line condition? |
1538 |
is_bad_line = (raster_y >= FIRST_DMA_LINE && raster_y <= LAST_DMA_LINE && ((raster_y & 7) == y_scroll) && bad_lines_enabled); |
1539 |
|
1540 |
// Don't draw all lines, hide some at the top and bottom |
1541 |
draw_this_line = (raster_y >= FIRST_DISP_LINE && raster_y <= LAST_DISP_LINE && !frame_skipped); |
1542 |
} |
1543 |
|
1544 |
// First sample of border state |
1545 |
border_on_sample[0] = border_on; |
1546 |
|
1547 |
SprPtrAccess(3); |
1548 |
SprDataAccess(3, 0); |
1549 |
DisplayIfBadLine; |
1550 |
if (!(spr_dma_on & 0x18)) |
1551 |
the_cpu->BALow = false; |
1552 |
break; |
1553 |
|
1554 |
// Set BA for sprite 5, read data of sprite 3 |
1555 |
case 2: |
1556 |
if (vblanking) { |
1557 |
|
1558 |
// Vertical blank, reset counters |
1559 |
raster_y = vc_base = 0; |
1560 |
ref_cnt = 0xff; |
1561 |
lp_triggered = vblanking = false; |
1562 |
|
1563 |
if (!(frame_skipped = --skip_counter)) |
1564 |
skip_counter = ThePrefs.SkipFrames; |
1565 |
|
1566 |
the_c64->VBlank(!frame_skipped); |
1567 |
|
1568 |
// Get bitmap pointer for next frame. This must be done |
1569 |
// after calling the_c64->VBlank() because the preferences |
1570 |
// and screen configuration may have been changed there |
1571 |
chunky_line_start = the_display->BitmapBase(); |
1572 |
xmod = the_display->BitmapXMod(); |
1573 |
|
1574 |
// Trigger raster IRQ if IRQ in line 0 |
1575 |
if (irq_raster == 0) |
1576 |
raster_irq(); |
1577 |
|
1578 |
} |
1579 |
|
1580 |
// Our output goes here |
1581 |
#ifdef __POWERPC__ |
1582 |
chunky_ptr = (uint8 *)chunky_tmp; |
1583 |
#else |
1584 |
chunky_ptr = chunky_line_start; |
1585 |
#endif |
1586 |
|
1587 |
// Clear foreground mask |
1588 |
memset(fore_mask_buf, 0, DISPLAY_X/8); |
1589 |
fore_mask_ptr = fore_mask_buf; |
1590 |
|
1591 |
SprDataAccess(3,1); |
1592 |
SprDataAccess(3,2); |
1593 |
DisplayIfBadLine; |
1594 |
if (spr_dma_on & 0x20) |
1595 |
SetBALow; |
1596 |
break; |
1597 |
|
1598 |
// Fetch sprite pointer 4, reset BA is sprite 4 and 5 off |
1599 |
case 3: |
1600 |
SprPtrAccess(4); |
1601 |
SprDataAccess(4, 0); |
1602 |
DisplayIfBadLine; |
1603 |
if (!(spr_dma_on & 0x30)) |
1604 |
the_cpu->BALow = false; |
1605 |
break; |
1606 |
|
1607 |
// Set BA for sprite 6, read data of sprite 4 |
1608 |
case 4: |
1609 |
SprDataAccess(4, 1); |
1610 |
SprDataAccess(4, 2); |
1611 |
DisplayIfBadLine; |
1612 |
if (spr_dma_on & 0x40) |
1613 |
SetBALow; |
1614 |
break; |
1615 |
|
1616 |
// Fetch sprite pointer 5, reset BA if sprite 5 and 6 off |
1617 |
case 5: |
1618 |
SprPtrAccess(5); |
1619 |
SprDataAccess(5, 0); |
1620 |
DisplayIfBadLine; |
1621 |
if (!(spr_dma_on & 0x60)) |
1622 |
the_cpu->BALow = false; |
1623 |
break; |
1624 |
|
1625 |
// Set BA for sprite 7, read data of sprite 5 |
1626 |
case 6: |
1627 |
SprDataAccess(5, 1); |
1628 |
SprDataAccess(5, 2); |
1629 |
DisplayIfBadLine; |
1630 |
if (spr_dma_on & 0x80) |
1631 |
SetBALow; |
1632 |
break; |
1633 |
|
1634 |
// Fetch sprite pointer 6, reset BA if sprite 6 and 7 off |
1635 |
case 7: |
1636 |
SprPtrAccess(6); |
1637 |
SprDataAccess(6, 0); |
1638 |
DisplayIfBadLine; |
1639 |
if (!(spr_dma_on & 0xc0)) |
1640 |
the_cpu->BALow = false; |
1641 |
break; |
1642 |
|
1643 |
// Read data of sprite 6 |
1644 |
case 8: |
1645 |
SprDataAccess(6, 1); |
1646 |
SprDataAccess(6, 2); |
1647 |
DisplayIfBadLine; |
1648 |
break; |
1649 |
|
1650 |
// Fetch sprite pointer 7, reset BA if sprite 7 off |
1651 |
case 9: |
1652 |
SprPtrAccess(7); |
1653 |
SprDataAccess(7, 0); |
1654 |
DisplayIfBadLine; |
1655 |
if (!(spr_dma_on & 0x80)) |
1656 |
the_cpu->BALow = false; |
1657 |
break; |
1658 |
|
1659 |
// Read data of sprite 7 |
1660 |
case 10: |
1661 |
SprDataAccess(7, 1); |
1662 |
SprDataAccess(7, 2); |
1663 |
DisplayIfBadLine; |
1664 |
break; |
1665 |
|
1666 |
// Refresh, reset BA |
1667 |
case 11: |
1668 |
RefreshAccess; |
1669 |
DisplayIfBadLine; |
1670 |
the_cpu->BALow = false; |
1671 |
break; |
1672 |
|
1673 |
// Refresh, turn on matrix access if Bad Line |
1674 |
case 12: |
1675 |
RefreshAccess; |
1676 |
FetchIfBadLine; |
1677 |
break; |
1678 |
|
1679 |
// Refresh, turn on matrix access if Bad Line, reset raster_x, graphics display starts here |
1680 |
case 13: |
1681 |
draw_background(); |
1682 |
SampleBorder; |
1683 |
RefreshAccess; |
1684 |
FetchIfBadLine; |
1685 |
raster_x = 0xfffc; |
1686 |
break; |
1687 |
|
1688 |
// Refresh, VCBASE->VCCOUNT, turn on matrix access and reset RC if Bad Line |
1689 |
case 14: |
1690 |
draw_background(); |
1691 |
SampleBorder; |
1692 |
RefreshAccess; |
1693 |
RCIfBadLine; |
1694 |
vc = vc_base; |
1695 |
break; |
1696 |
|
1697 |
// Refresh and matrix access, increment mc_base by 2 if y expansion flipflop is set |
1698 |
case 15: |
1699 |
draw_background(); |
1700 |
SampleBorder; |
1701 |
RefreshAccess; |
1702 |
FetchIfBadLine; |
1703 |
|
1704 |
for (i=0; i<8; i++) |
1705 |
if (spr_exp_y & (1 << i)) |
1706 |
mc_base[i] += 2; |
1707 |
|
1708 |
ml_index = 0; |
1709 |
matrix_access(); |
1710 |
break; |
1711 |
|
1712 |
// Graphics and matrix access, increment mc_base by 1 if y expansion flipflop is set |
1713 |
// and check if sprite DMA can be turned off |
1714 |
case 16: |
1715 |
draw_background(); |
1716 |
SampleBorder; |
1717 |
graphics_access(); |
1718 |
FetchIfBadLine; |
1719 |
|
1720 |
mask = 1; |
1721 |
for (i=0; i<8; i++, mask<<=1) { |
1722 |
if (spr_exp_y & mask) |
1723 |
mc_base[i]++; |
1724 |
if ((mc_base[i] & 0x3f) == 0x3f) |
1725 |
spr_dma_on &= ~mask; |
1726 |
} |
1727 |
|
1728 |
matrix_access(); |
1729 |
break; |
1730 |
|
1731 |
// Graphics and matrix access, turn off border in 40 column mode, display window starts here |
1732 |
case 17: |
1733 |
if (ctrl2 & 8) { |
1734 |
if (raster_y == dy_stop) |
1735 |
ud_border_on = true; |
1736 |
else { |
1737 |
if (ctrl1 & 0x10) { |
1738 |
if (raster_y == dy_start) |
1739 |
border_on = ud_border_on = false; |
1740 |
else |
1741 |
if (!ud_border_on) |
1742 |
border_on = false; |
1743 |
} else |
1744 |
if (!ud_border_on) |
1745 |
border_on = false; |
1746 |
} |
1747 |
} |
1748 |
|
1749 |
// Second sample of border state |
1750 |
border_on_sample[1] = border_on; |
1751 |
|
1752 |
draw_background(); |
1753 |
draw_graphics(); |
1754 |
SampleBorder; |
1755 |
graphics_access(); |
1756 |
FetchIfBadLine; |
1757 |
matrix_access(); |
1758 |
break; |
1759 |
|
1760 |
// Turn off border in 38 column mode |
1761 |
case 18: |
1762 |
if (!(ctrl2 & 8)) { |
1763 |
if (raster_y == dy_stop) |
1764 |
ud_border_on = true; |
1765 |
else { |
1766 |
if (ctrl1 & 0x10) { |
1767 |
if (raster_y == dy_start) |
1768 |
border_on = ud_border_on = false; |
1769 |
else |
1770 |
if (!ud_border_on) |
1771 |
border_on = false; |
1772 |
} else |
1773 |
if (!ud_border_on) |
1774 |
border_on = false; |
1775 |
} |
1776 |
} |
1777 |
|
1778 |
// Third sample of border state |
1779 |
border_on_sample[2] = border_on; |
1780 |
|
1781 |
// Falls through |
1782 |
|
1783 |
// Graphics and matrix access |
1784 |
case 19: case 20: case 21: case 22: case 23: case 24: |
1785 |
case 25: case 26: case 27: case 28: case 29: case 30: |
1786 |
case 31: case 32: case 33: case 34: case 35: case 36: |
1787 |
case 37: case 38: case 39: case 40: case 41: case 42: |
1788 |
case 43: case 44: case 45: case 46: case 47: case 48: |
1789 |
case 49: case 50: case 51: case 52: case 53: case 54: // Gnagna... |
1790 |
draw_graphics(); |
1791 |
SampleBorder; |
1792 |
graphics_access(); |
1793 |
FetchIfBadLine; |
1794 |
matrix_access(); |
1795 |
last_char_data = char_data; |
1796 |
break; |
1797 |
|
1798 |
// Last graphics access, turn off matrix access, turn on sprite DMA if Y coordinate is |
1799 |
// right and sprite is enabled, handle sprite y expansion, set BA for sprite 0 |
1800 |
case 55: |
1801 |
draw_graphics(); |
1802 |
SampleBorder; |
1803 |
graphics_access(); |
1804 |
DisplayIfBadLine; |
1805 |
|
1806 |
// Invert y expansion flipflop if bit in MYE is set |
1807 |
mask = 1; |
1808 |
for (i=0; i<8; i++, mask<<=1) |
1809 |
if (mye & mask) |
1810 |
spr_exp_y ^= mask; |
1811 |
CheckSpriteDMA; |
1812 |
|
1813 |
if (spr_dma_on & 0x01) { // Don't remove these braces! |
1814 |
SetBALow; |
1815 |
} else |
1816 |
the_cpu->BALow = false; |
1817 |
break; |
1818 |
|
1819 |
// Turn on border in 38 column mode, turn on sprite DMA if Y coordinate is right and |
1820 |
// sprite is enabled, set BA for sprite 0, display window ends here |
1821 |
case 56: |
1822 |
if (!(ctrl2 & 8)) |
1823 |
border_on = true; |
1824 |
|
1825 |
// Fourth sample of border state |
1826 |
border_on_sample[3] = border_on; |
1827 |
|
1828 |
draw_graphics(); |
1829 |
SampleBorder; |
1830 |
IdleAccess; |
1831 |
DisplayIfBadLine; |
1832 |
CheckSpriteDMA; |
1833 |
|
1834 |
if (spr_dma_on & 0x01) |
1835 |
SetBALow; |
1836 |
break; |
1837 |
|
1838 |
// Turn on border in 40 column mode, set BA for sprite 1, paint sprites |
1839 |
case 57: |
1840 |
if (ctrl2 & 8) |
1841 |
border_on = true; |
1842 |
|
1843 |
// Fifth sample of border state |
1844 |
border_on_sample[4] = border_on; |
1845 |
|
1846 |
// Sample spr_disp_on and spr_data for sprite drawing |
1847 |
if ((spr_draw = spr_disp_on) != 0) |
1848 |
memcpy(spr_draw_data, spr_data, 8*4); |
1849 |
|
1850 |
// Turn off sprite display if DMA is off |
1851 |
mask = 1; |
1852 |
for (i=0; i<8; i++, mask<<=1) |
1853 |
if ((spr_disp_on & mask) && !(spr_dma_on & mask)) |
1854 |
spr_disp_on &= ~mask; |
1855 |
|
1856 |
draw_background(); |
1857 |
SampleBorder; |
1858 |
IdleAccess; |
1859 |
DisplayIfBadLine; |
1860 |
if (spr_dma_on & 0x02) |
1861 |
SetBALow; |
1862 |
break; |
1863 |
|
1864 |
// Fetch sprite pointer 0, mc_base->mc, turn on sprite display if necessary, |
1865 |
// turn off display if RC=7, read data of sprite 0 |
1866 |
case 58: |
1867 |
draw_background(); |
1868 |
SampleBorder; |
1869 |
|
1870 |
mask = 1; |
1871 |
for (i=0; i<8; i++, mask<<=1) { |
1872 |
mc[i] = mc_base[i]; |
1873 |
if ((spr_dma_on & mask) && (raster_y & 0xff) == my[i]) |
1874 |
spr_disp_on |= mask; |
1875 |
} |
1876 |
SprPtrAccess(0); |
1877 |
SprDataAccess(0, 0); |
1878 |
|
1879 |
if (rc == 7) { |
1880 |
vc_base = vc; |
1881 |
display_state = false; |
1882 |
} |
1883 |
if (is_bad_line || display_state) { |
1884 |
display_state = true; |
1885 |
rc = (rc + 1) & 7; |
1886 |
} |
1887 |
break; |
1888 |
|
1889 |
// Set BA for sprite 2, read data of sprite 0 |
1890 |
case 59: |
1891 |
draw_background(); |
1892 |
SampleBorder; |
1893 |
SprDataAccess(0, 1); |
1894 |
SprDataAccess(0, 2); |
1895 |
DisplayIfBadLine; |
1896 |
if (spr_dma_on & 0x04) |
1897 |
SetBALow; |
1898 |
break; |
1899 |
|
1900 |
// Fetch sprite pointer 1, reset BA if sprite 1 and 2 off, graphics display ends here |
1901 |
case 60: |
1902 |
draw_background(); |
1903 |
SampleBorder; |
1904 |
|
1905 |
if (draw_this_line) { |
1906 |
|
1907 |
// Draw sprites |
1908 |
if (spr_draw && ThePrefs.SpritesOn) |
1909 |
draw_sprites(); |
1910 |
|
1911 |
// Draw border |
1912 |
#ifdef __POWERPC__ |
1913 |
if (border_on_sample[0]) |
1914 |
for (i=0; i<4; i++) |
1915 |
memset8((uint8 *)chunky_tmp+i*8, border_color_sample[i]); |
1916 |
if (border_on_sample[1]) |
1917 |
memset8((uint8 *)chunky_tmp+4*8, border_color_sample[4]); |
1918 |
if (border_on_sample[2]) |
1919 |
for (i=5; i<43; i++) |
1920 |
memset8((uint8 *)chunky_tmp+i*8, border_color_sample[i]); |
1921 |
if (border_on_sample[3]) |
1922 |
memset8((uint8 *)chunky_tmp+43*8, border_color_sample[43]); |
1923 |
if (border_on_sample[4]) |
1924 |
for (i=44; i<DISPLAY_X/8; i++) |
1925 |
memset8((uint8 *)chunky_tmp+i*8, border_color_sample[i]); |
1926 |
#else |
1927 |
if (border_on_sample[0]) |
1928 |
for (i=0; i<4; i++) |
1929 |
memset8(chunky_line_start+i*8, border_color_sample[i]); |
1930 |
if (border_on_sample[1]) |
1931 |
memset8(chunky_line_start+4*8, border_color_sample[4]); |
1932 |
if (border_on_sample[2]) |
1933 |
for (i=5; i<43; i++) |
1934 |
memset8(chunky_line_start+i*8, border_color_sample[i]); |
1935 |
if (border_on_sample[3]) |
1936 |
memset8(chunky_line_start+43*8, border_color_sample[43]); |
1937 |
if (border_on_sample[4]) |
1938 |
for (i=44; i<DISPLAY_X/8; i++) |
1939 |
memset8(chunky_line_start+i*8, border_color_sample[i]); |
1940 |
#endif |
1941 |
|
1942 |
#ifdef __POWERPC__ |
1943 |
// Copy temporary buffer to bitmap |
1944 |
fastcopy(chunky_line_start, (uint8 *)chunky_tmp); |
1945 |
#endif |
1946 |
|
1947 |
// Increment pointer in chunky buffer |
1948 |
chunky_line_start += xmod; |
1949 |
} |
1950 |
|
1951 |
SprPtrAccess(1); |
1952 |
SprDataAccess(1, 0); |
1953 |
DisplayIfBadLine; |
1954 |
if (!(spr_dma_on & 0x06)) |
1955 |
the_cpu->BALow = false; |
1956 |
break; |
1957 |
|
1958 |
// Set BA for sprite 3, read data of sprite 1 |
1959 |
case 61: |
1960 |
SprDataAccess(1, 1); |
1961 |
SprDataAccess(1, 2); |
1962 |
DisplayIfBadLine; |
1963 |
if (spr_dma_on & 0x08) |
1964 |
SetBALow; |
1965 |
break; |
1966 |
|
1967 |
// Read sprite pointer 2, reset BA if sprite 2 and 3 off, read data of sprite 2 |
1968 |
case 62: |
1969 |
SprPtrAccess(2); |
1970 |
SprDataAccess(2, 0); |
1971 |
DisplayIfBadLine; |
1972 |
if (!(spr_dma_on & 0x0c)) |
1973 |
the_cpu->BALow = false; |
1974 |
break; |
1975 |
|
1976 |
// Set BA for sprite 4, read data of sprite 2 |
1977 |
case 63: |
1978 |
SprDataAccess(2, 1); |
1979 |
SprDataAccess(2, 2); |
1980 |
DisplayIfBadLine; |
1981 |
|
1982 |
if (raster_y == dy_stop) |
1983 |
ud_border_on = true; |
1984 |
else |
1985 |
if (ctrl1 & 0x10 && raster_y == dy_start) |
1986 |
ud_border_on = false; |
1987 |
|
1988 |
if (spr_dma_on & 0x10) |
1989 |
SetBALow; |
1990 |
|
1991 |
// Last cycle |
1992 |
raster_x += 8; |
1993 |
cycle = 1; |
1994 |
return true; |
1995 |
} |
1996 |
|
1997 |
// Next cycle |
1998 |
raster_x += 8; |
1999 |
cycle++; |
2000 |
return false; |
2001 |
} |