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https://github.com/ekeeke/Genesis-Plus-GX.git
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349 lines
8.3 KiB
C
349 lines
8.3 KiB
C
/****************************************************************************
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* ggentry.c
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*
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* Genesis Plus GX Game Genie
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*
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* Softdev (2006)
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* Eke-Eke (2007,2008,2009)
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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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#include "shared.h"
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#include "font.h"
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#include "gui.h"
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#define MAXCODES 8
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extern char menutitle[60];
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typedef struct
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{
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int address;
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unsigned short data;
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} GGPATCH;
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/*** Game Genie Codes Array ***/
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unsigned char ggcodes[MAXCODES][10]; /*** Codes are entered as XXXX-XXXX ***/
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int gghpos[MAXCODES]; /*** Edit positions ***/
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int ggrow = 0;
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int editing = 0;
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char ggvalidchars[] = "ABCDEFGHJKLMNPRSTVWXYZ0123456789*";
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GGPATCH ggpatch[8];
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/****************************************************************************
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* Decode Game Genie entries to memory patches
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****************************************************************************/
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void decode_genie (char *code, int which)
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{
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char *p;
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int n, i;
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for (i = 0; i < 8; i++)
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{
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/*** This should only happen if memory is corrupt! ***/
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p = strchr (ggvalidchars, code[i]);
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if (p == NULL)
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{
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ggpatch[which].address = ggpatch[which].data = 0;
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return;
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}
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n = p - ggvalidchars;
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switch (i)
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{
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case 0:
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ggpatch[which].data |= n << 3;
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break;
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case 1:
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ggpatch[which].data |= n >> 2;
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ggpatch[which].address |= (n & 3) << 14;
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break;
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case 2:
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ggpatch[which].address |= n << 9;
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break;
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case 3:
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ggpatch[which].address |= (n & 0xF) << 20 | (n >> 4) << 8;
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break;
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case 4:
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ggpatch[which].data |= (n & 1) << 12;
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ggpatch[which].address |= (n >> 1) << 16;
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break;
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case 5:
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ggpatch[which].data |= (n & 1) << 15 | (n >> 1) << 8;
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break;
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case 6:
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ggpatch[which].data |= (n >> 3) << 13;
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ggpatch[which].address |= (n & 7) << 5;
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break;
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case 7:
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ggpatch[which].address |= n;
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break;
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}
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}
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}
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void decode_ggcodes ()
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{
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int i, j;
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char thiscode[10];
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/*** Clear out any old patches ***/
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memset (&ggpatch[0], 0, 8 * sizeof (GGPATCH));
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memset (&thiscode, 0, 10);
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j = 0;
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for (i = 0; i < 8; i++)
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{
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if (strcmp ((char *)ggcodes[i], "AAAA-AAAA"))
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{
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/*** Move the code into thiscode ***/
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memcpy (&thiscode, &ggcodes[i], 4);
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memcpy (&thiscode[4], &ggcodes[i][5], 4);
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decode_genie (thiscode, j);
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j++;
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}
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}
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/*** And now apply the patches ***/
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if (j)
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{
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for (i = 0; i < j; i++)
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{
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if (ggpatch[i].address < 0x400000)
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{
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/*** Patching ROM space ONLY (Game Genie does NOT have access to other memory areas) ***/
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if (cart_rom) *(uint16 *)(cart_rom + ggpatch[i].address) = ggpatch[i].data & 0xffff;
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}
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}
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}
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}
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/****************************************************************************
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* ClearGGCodes
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*
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* Should be called whenever a new rom is loaded
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****************************************************************************/
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void ClearGGCodes ()
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{
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int i;
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for (i = 0; i < MAXCODES; i++)
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{
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strcpy ((char *)ggcodes[i], "AAAA-AAAA");
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gghpos[i] = 0;
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}
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ggrow = 0;
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}
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/****************************************************************************
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* DrawGGCodes
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*
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* Just draw the codes, with the current one highlighted.
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****************************************************************************/
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void DrawGGCodes ()
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{
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int i,j;
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unsigned char c[2] = { 0, 0 };
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gxClearScreen ((GXColor)BLACK);
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WriteCentre (134, menutitle);
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for (i = 0; i < MAXCODES; i++)
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{
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if (i == ggrow)
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{
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/*** Highlight selected ***/
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WriteCentre_HL (i * fheight + 190, (char *)ggcodes[i]);
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/*** If editing, highlight the current character ***/
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if (editing)
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{
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int hpos = 0;
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for (j=0; j<strlen ((char *)ggcodes[i]); j++) hpos += font_size[ggcodes[i][j]];
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hpos = ((640 - hpos) >> 1);
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for (j=0; j<gghpos[i]; j++) hpos += font_size[ggcodes[i][j]];
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c[0] = ggcodes[i][gghpos[i]];
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fntDrawBoxFilled (hpos, (i * fheight) + 190, hpos + font_size[c[0]],
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((i + 1) * fheight) + 190, COLOR_YELLOW);
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write_font (hpos, (i * fheight) + 190, (char *)c);
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}
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}
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else WriteCentre ((i * fheight) + 190, (char *)ggcodes[i]);
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}
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gxSetScreen ();
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}
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/****************************************************************************
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* GGEditLine
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*
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* Up/Down traverses valid character array
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* Left/Right moves along current line
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* A exits edit mode
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****************************************************************************/
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void GGEditLine ()
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{
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short p;
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char c[2] = { 0, 0 };
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char *v;
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int redraw = 1;
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int quit = 0;
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editing = 1;
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while (quit == 0)
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{
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if (redraw)
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{
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DrawGGCodes ();
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redraw = 0;
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}
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p = m_input.keys;
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if (p & PAD_BUTTON_UP)
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{
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/*** Increment the entry ***/
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redraw = 1;
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c[0] = ggcodes[ggrow][gghpos[ggrow]];
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v = strstr (ggvalidchars, c);
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v++;
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if (*v == '*') ggcodes[ggrow][gghpos[ggrow]] = 'A';
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else ggcodes[ggrow][gghpos[ggrow]] = *v;
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}
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if (p & PAD_BUTTON_DOWN)
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{
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/*** Decrement entry ***/
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redraw = 1;
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c[0] = ggcodes[ggrow][gghpos[ggrow]];
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v = strstr (ggvalidchars, c);
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if (*v == 'A') ggcodes[ggrow][gghpos[ggrow]] = '9';
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else
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{
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v--;
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ggcodes[ggrow][gghpos[ggrow]] = *v;
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}
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}
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if (p & PAD_BUTTON_LEFT)
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{
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redraw = 1;
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gghpos[ggrow]--;
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if (gghpos[ggrow] == 4) gghpos[ggrow]--;
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}
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if (p & PAD_BUTTON_RIGHT)
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{
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redraw = 1;
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gghpos[ggrow]++;
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if (gghpos[ggrow] == 4) gghpos[ggrow]++;
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}
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if (gghpos[ggrow] < 0) gghpos[ggrow] = 8;
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if (gghpos[ggrow] > 8) gghpos[ggrow] = 0;
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if (p & PAD_BUTTON_A) quit = 1;
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}
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editing = 0;
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}
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/****************************************************************************
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* GGSelectLine
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*
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* Select which line to edit
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****************************************************************************/
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void GGSelectLine ()
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{
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int redraw = 1;
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int quit = 0;
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short j;
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/*** To select a line, just move up or down.
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Pressing A will enter edit mode.
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Pressing B will exit to caller. ***/
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while (quit == 0)
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{
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if (redraw)
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{
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DrawGGCodes ();
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redraw = 0;
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}
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j = m_input.keys;
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if (j & PAD_BUTTON_UP)
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{
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ggrow--;
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redraw = 1;
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}
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if (j & PAD_BUTTON_DOWN)
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{
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ggrow++;
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redraw = 1;
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}
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if (ggrow < 0) ggrow = MAXCODES - 1;
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if (ggrow == MAXCODES) ggrow = 0;
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if (j & PAD_BUTTON_B) quit = 1;
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if (j & PAD_BUTTON_A)
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{
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GGEditLine ();
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redraw = 1;
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}
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if (j & PAD_TRIGGER_Z)
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{
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/* reset code */
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strcpy ((char *)ggcodes[ggrow], "AAAA-AAAA");
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gghpos[ggrow] = 0;
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redraw = 1;
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}
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}
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}
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/****************************************************************************
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* GetGGEntries
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*
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* Screen to return encoded Game Genie codes.
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* No keyboard is available, so it's just a simple wrap round each line kind
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* of thing.
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****************************************************************************/
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void GetGGEntries ()
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{
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editing = 0;
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strcpy (menutitle, "Game Genie Entry");
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GGSelectLine ();
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/* Apply Game Genie patches */
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decode_ggcodes ();
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}
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