pacbox - a Pacman arcade machine emulator. Currently working for all colour targets and the iriver H1x0. Requires the Pacman arcade machine ROMs in /.rockbox/pacman/

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9001 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 197 insertions, 0 deletions

diff --git a/apps/plugins/pacbox/hardware.c b/apps/plugins/pacbox/hardware.c
new file mode 100644
index 0000000000..3cc4858e43
--- /dev/null
+++ b/apps/plugins/pacbox/hardware.c
@@ -0,0 +1,197 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Pacbox - a Pacman Emulator for Rockbox
+ *
+ * Based on PIE - Pacman Instructional Emulator
+ *
+ * Copyright (c) 1997-2003,2004 Alessandro Scotti
+ * http://www.ascotti.org/
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "plugin.h"
+#include "hardware.h"
+
+extern struct plugin_api* rb;
+
+/* The main data for Pacman  */
+
+unsigned char ram_[20*1024] IBSS_ATTR;          // ROM (16K) and RAM (4K)
+unsigned char charset_rom_[4*1024] IBSS_ATTR;   // Character set ROM (4K)
+unsigned char spriteset_rom_[4*1024] IBSS_ATTR; // Sprite set ROM (4K)
+unsigned char dirty_[1024] IBSS_ATTR;
+unsigned char video_mem_[1024] IBSS_ATTR;       // Video memory (1K)
+unsigned char color_mem_[1024] IBSS_ATTR;       // Color memory (1K)
+unsigned char charmap_[256*8*8];    /* Character data for 256 8x8 characters */
+unsigned char spritemap_[64*16*16]; /* Sprite data for 64 16x16 sprites */
+unsigned char output_devices_ IBSS_ATTR;  /* Output flip-flops set by the game program */
+unsigned char interrupt_vector_ IBSS_ATTR;
+unsigned      coin_counter_ IBSS_ATTR;
+unsigned char port1_ IBSS_ATTR;
+unsigned char port2_ IBSS_ATTR;
+unsigned char dip_switches_ IBSS_ATTR;
+
+/* Internal tables and structures for faster access to data */
+struct PacmanSprite sprites_[8];    /* Sprites */
+short vchar_to_i_[1024];
+
+
+/*
+    For Z80 Environment: write a byte to memory.
+*/
+void writeByte( unsigned addr, unsigned char b )
+{
+    addr &= 0x7FFF;
+
+    if( addr < 0x4000 ) {
+        // This is a ROM address, do not write into it!
+    }
+    else if( addr < 0x4400 ) {
+        // Video memory
+        if (ram_[addr] != b) {
+            int x = vchar_to_i_[addr-0x4000];
+            ram_[addr] = b;
+            dirty_[x] = 1;
+            video_mem_[x] = b;
+        }
+    }
+    else if( addr < 0x4800 ) {
+        // Color memory
+        if (ram_[addr] != b) {
+            int x = vchar_to_i_[addr-0x4400];
+            ram_[addr] = b;
+            dirty_[x] = 1;
+            color_mem_[x] = b;
+        }
+    }
+    else if( addr < 0x4FF0 ) {
+        // Standard memory
+        ram_[addr] = b;
+    }
+    else if( addr < 0x5000 ) {
+        // Sprites
+        ram_[addr] = b;
+
+        unsigned idx = (addr - 0x4FF0) / 2;
+
+        if( addr & 1 ) {
+            sprites_[ idx ].color = b;
+        }
+        else {
+            sprites_[ idx ].n = b >> 2;
+            sprites_[ idx ].mode = b & 0x03;
+        }
+    }
+    else {
+    // Memory mapped ports
+    switch( addr ) {
+        case 0x5000:
+            // Interrupt enable
+            setOutputFlipFlop( InterruptEnabled, b & 0x01 );
+            break;
+        case 0x5001:
+            // Sound enable
+            setOutputFlipFlop( SoundEnabled, b & 0x01 );
+            break;
+        case 0x5002:
+            // Aux board enable?
+            break;
+        case 0x5003:
+            // Flip screen
+            setOutputFlipFlop( FlipScreen, b & 0x01 );
+            break;
+        case 0x5004:
+            // Player 1 start light
+            setOutputFlipFlop( PlayerOneLight, b & 0x01 );
+            break;
+        case 0x5005:
+            // Player 2 start light
+            setOutputFlipFlop( PlayerTwoLight, b & 0x01 );
+            break;
+        case 0x5006:
+            // Coin lockout: bit 0 is used to enable/disable the coin insert slots 
+            // (0=disable).
+            // The coin slot is enabled at startup and (temporarily) disabled when 
+            // the maximum number of credits (99) is inserted.
+            setOutputFlipFlop( CoinLockout, b & 0x01 );
+            break;
+        case 0x5007:
+            // Coin meter (coin counter incremented on 0/1 edge)
+            if( (output_devices_ & CoinMeter) == 0 && (b & 0x01) != 0 )
+                coin_counter_++;
+            setOutputFlipFlop( CoinMeter, b & 0x01 );
+            break;
+        case 0x50c0:
+            // Watchdog reset
+            break;
+        default:
+            if( addr >= 0x5040 && addr < 0x5060 ) {
+                // Sound registers
+                //SOUND sound_chip_.setRegister( addr-0x5040, b );
+            }
+            else if( addr >= 0x5060 && addr < 0x5070 ) {
+                // Sprite coordinates, x/y pairs for 8 sprites
+                unsigned idx = (addr-0x5060) / 2;
+
+                if( addr & 1 ) {
+                    sprites_[ idx ].y = 272 - b + 1;
+                }
+                else {
+                    sprites_[ idx ].x = 240 - b - 1;
+
+                    if( idx <= 2 ) {
+                        // In Pacman the first few sprites must be further offset 
+                        // to the left to get a correct display (is this a hack?)
+                        sprites_[ idx ].x -= 1;
+                    }
+                }
+            }
+            break;
+        }
+    }
+}
+
+/*
+    For Z80 Environment: read from a port.
+
+    Note: all ports in Pacman are memory mapped so they are read with readByte().
+*/
+unsigned char readPort( unsigned port ) 
+{
+    (void)port;
+    return 0;
+}
+
+/*
+    For Z80 Environment: write to a port.
+*/
+void writePort( unsigned addr, unsigned char b )
+{
+    if( addr == 0 ) {
+        // Sets the interrupt vector for the next CPU interrupt
+        interrupt_vector_ = b;
+    }
+}
+
+void setOutputFlipFlop( unsigned char bit, unsigned char value )
+{
+    if( value ) {
+        output_devices_ |= bit;
+    }
+    else {
+        output_devices_ &= ~bit;
+    }
+}