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/* |
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* main.cpp - SIDPlayer common routines |
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* |
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* SIDPlayer (C) Copyright 1996-2004 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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#include "sys.h" |
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|
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#include <stdio.h> |
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#include <string.h> |
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|
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#if defined(__BEOS__) |
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#include <support/UTF8.h> |
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#endif |
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|
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#include "main.h" |
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#include "prefs.h" |
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#include "mem.h" |
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#include "cpu.h" |
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#include "sid.h" |
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#include "psid.h" |
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|
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|
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// Global variables |
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uint32 f_rand_seed = 1; |
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int number_of_songs, current_song; |
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char module_name[64]; |
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char author_name[64]; |
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char copyright_info[64]; |
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|
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// Flag: PSID file loaded and ready |
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static bool psid_loaded = false; |
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|
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// Data from PSID header |
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static uint16 init_adr; // C64 init routine address |
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uint16 play_adr; // C64 replay routine address |
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static bool play_adr_from_irq_vec; // Flag: dynamically update play_adr from IRQ vector ($0314/$0315 or $fffe/$ffff) |
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static uint32 speed_flags; // Speed flags (1 bit/song) |
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|
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|
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|
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/* |
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* Init everything |
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*/ |
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|
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void InitAll(int &argc, char **&argv) |
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{ |
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PrefsInit(argc, argv); |
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MemoryInit(); |
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SIDInit(); |
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CPUInit(); |
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} |
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|
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|
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/* |
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* Exit everything |
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*/ |
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|
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void ExitAll() |
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{ |
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CPUExit(); |
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SIDExit(); |
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MemoryExit(); |
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PrefsExit(); |
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} |
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|
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|
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/* |
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* Read PSID file header to buffer |
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*/ |
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|
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bool LoadPSIDHeader(const char *file, uint8 *p) |
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{ |
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// Read header |
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memset(p, 0, PSID_MAX_HEADER_LENGTH); |
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FILE *f = fopen(file, "rb"); |
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if (f == NULL) |
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return false; |
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size_t actual = fread(p, 1, PSID_MAX_HEADER_LENGTH, f); |
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fclose(f); |
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return actual >= PSID_MIN_HEADER_LENGTH; |
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} |
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|
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|
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/* |
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* Check for PSID header |
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*/ |
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|
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bool IsPSIDHeader(const uint8 *p) |
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{ |
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// Check signature and version |
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uint32 id = read_psid_32(p, PSID_ID); |
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uint16 version = read_psid_16(p, PSID_VERSION); |
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return id == 0x50534944 && (version == 1 || version == 2); |
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} |
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|
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|
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/* |
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* Check whether file is a PSID file |
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*/ |
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|
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bool IsPSIDFile(const char *file) |
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{ |
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// Load header |
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uint8 header[PSID_MAX_HEADER_LENGTH]; |
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if (!LoadPSIDHeader(file, header)) |
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return false; |
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|
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// Check header |
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return IsPSIDHeader(header); |
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} |
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|
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|
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/* |
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* Load PSID file for playing |
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*/ |
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|
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bool LoadPSIDFile(const char *file) |
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{ |
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// Open file |
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FILE *f = fopen(file, "rb"); |
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if (f == NULL) |
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return false; |
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|
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// Clear C64 RAM |
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MemoryClear(); |
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psid_loaded = false; |
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|
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// Load and check header |
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uint8 header[PSID_MAX_HEADER_LENGTH]; |
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memset(header, 0, PSID_MAX_HEADER_LENGTH); |
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size_t actual = fread(header, 1, PSID_MAX_HEADER_LENGTH, f); |
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if (actual < PSID_MIN_HEADER_LENGTH || !IsPSIDHeader(header)) { |
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fclose(f); |
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return false; |
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} |
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|
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// Extract data from header |
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number_of_songs = read_psid_16(header, PSID_NUMBER); |
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if (number_of_songs == 0) |
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number_of_songs = 1; |
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current_song = read_psid_16(header, PSID_DEFSONG); |
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if (current_song) |
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current_song--; |
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if (current_song >= number_of_songs) |
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current_song = 0; |
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|
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init_adr = read_psid_16(header, PSID_INIT); |
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play_adr = read_psid_16(header, PSID_MAIN); |
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play_adr_from_irq_vec = (play_adr == 0); |
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|
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speed_flags = read_psid_32(header, PSID_SPEED); |
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|
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#if defined(__BEOS__) |
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int32 sl = 32, dl = 64, state = 0; |
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convert_to_utf8(B_ISO1_CONVERSION, (char *)(header + PSID_NAME), &sl, module_name, &dl, &state); |
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sl = 32, dl = 64, state = 0; |
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convert_to_utf8(B_ISO1_CONVERSION, (char *)(header + PSID_AUTHOR), &sl, author_name, &dl, &state); |
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sl = 32, dl = 64, state = 0; |
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convert_to_utf8(B_ISO1_CONVERSION, (char *)(header + PSID_COPYRIGHT), &sl, copyright_info, &dl, &state); |
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module_name[63] = 0; |
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author_name[63] = 0; |
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copyright_info[63] = 0; |
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#else |
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strncpy(module_name, (char *)(header + PSID_NAME), 32); |
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strncpy(author_name, (char *)(header + PSID_AUTHOR), 32); |
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strncpy(copyright_info, (char *)(header + PSID_COPYRIGHT), 32); |
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module_name[32] = 0; |
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author_name[32] = 0; |
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copyright_info[32] = 0; |
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#endif |
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|
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// Seek to start of module data |
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fseek(f, read_psid_16(header, PSID_LENGTH), SEEK_SET); |
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|
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// Find load address |
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uint16 load_adr = read_psid_16(header, PSID_START); |
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if (load_adr == 0) { // Load address is at start of module data |
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uint8 lo = fgetc(f); |
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uint8 hi = fgetc(f); |
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load_adr = (hi << 8) | lo; |
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} |
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if (init_adr == 0) // Init routine address is equal to load address |
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init_adr = load_adr; |
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|
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// Load module data to C64 RAM |
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fread(ram + load_adr, 1, RAM_SIZE - load_adr, f); |
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fclose(f); |
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|
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// Select default song |
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SelectSong(current_song); |
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|
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// Everything OK |
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psid_loaded = true; |
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return true; |
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} |
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|
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|
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/* |
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* PSID file loaded and ready? |
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*/ |
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|
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bool IsPSIDLoaded() |
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{ |
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return psid_loaded; |
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} |
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|
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|
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/* |
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* Select song for playing |
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*/ |
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|
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void SelectSong(int num) |
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{ |
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if (num >= number_of_songs) |
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num = 0; |
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current_song = num; |
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|
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// Reset SID |
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SIDReset(0); |
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|
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// Set replay frequency |
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int freq = 50; |
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if (num < 32) |
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freq = speed_flags & (1 << num) ? 60 : 50; |
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SIDSetReplayFreq(freq); |
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SIDAdjustSpeed(100); |
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|
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// Execute init routine |
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CPUExecute(init_adr, current_song, 0, 0, 1000000); |
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} |
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|
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|
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/* |
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* Update play_adr from IRQ vector if necessary |
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*/ |
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|
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void UpdatePlayAdr() |
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{ |
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if (play_adr_from_irq_vec) { |
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if (ram[1] & 2) // Kernal ROM switched in |
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play_adr = (ram[0x0315] << 8) | ram[0x0314]; |
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else // Kernal ROM switched out |
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play_adr = (ram[0xffff] << 8) | ram[0xfffe]; |
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} |
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} |
