/* Project 16 Source Code~\r
- * Copyright (C) 2012-2017 sparky4 & pngwen & andrius4669 & joncampbell123 & yakui-lover\r
+ * Copyright (C) 2012-2022 sparky4 & pngwen & andrius4669 & joncampbell123 & yakui-lover\r
*\r
* This file is part of Project 16.\r
*\r
\r
#include "src/lib/16_snd.h"\r
\r
+static void interrupt (*t0OldService)(void);\r
+\r
void opl2out(word reg, word data)\r
{\r
__asm\r
opCellNum = (byte)0xC0 + (byte)voiceNum;\r
opl2out(opCellNum, ins->Feedback);\r
} /* End of FMSetVoice */\r
+\r
+\r
+//newer sd\r
+\r
+\r
+struct glob_game_vars *ggvv;\r
+// WARNING: subroutine call in interrupt handler. make sure you compile with -zu flag for large/compact memory models\r
+void interrupt SDL_irq0()\r
+{\r
+ ggvv->ca.sd.irq0_ticks++;\r
+ if ((ggvv->ca.sd.irq0_cnt += ggvv->ca.sd.irq0_add) >= ggvv->ca.sd.irq0_max) {\r
+ ggvv->ca.sd.irq0_cnt -= ggvv->ca.sd.irq0_max;\r
+ t0OldService();\r
+ }\r
+ else {\r
+ p8259_OCW2(0,P8259_OCW2_NON_SPECIFIC_EOI);\r
+ }\r
+}\r
+\r
+void SD_Initimf(global_game_variables_t *gvar)\r
+{\r
+ if (!init_adlib()) {\r
+ printf("Cannot init library\n");\r
+ return;\r
+ }\r
+ if (!probe_8254()) { /* we need the timer to keep time with the music */\r
+ printf("8254 timer not found\n");\r
+ return;\r
+ }\r
+\r
+ gvar->ca.sd.imf_delay_countdown=0;\r
+ gvar->ca.sd.imf_music=\r
+ gvar->ca.sd.imf_play_ptr=\r
+ gvar->ca.sd.imf_music_end=NULL;\r
+\r
+ SD_adlib_shut_up();\r
+ shutdown_adlib_opl3(); // NTS: Apparently the music won't play otherwise\r
+}\r
+\r
+void SD_imf_reset_music(global_game_variables_t *gvar)\r
+{\r
+ gvar->ca.sd.imf_music = gvar->ca.sd.imf_play_ptr = gvar->ca.sd.imf_music_end = NULL;\r
+ gvar->ca.sd.imf_delay_countdown = 0;\r
+}\r
+\r
+void SD_StartupTimer(global_game_variables_t *gvar)\r
+{\r
+ gvar->ca.sd.irq0_ticks=\r
+ gvar->ca.sd.irq0_cnt = 0;\r
+ gvar->ca.sd.irq0_add = 182;\r
+ gvar->ca.sd.irq0_max = 1000; /* about 18.2Hz */\r
+ gvar->ca.sd.tickrate = 700;\r
+\r
+ write_8254_system_timer(T8254_REF_CLOCK_HZ / gvar->ca.sd.tickrate);\r
+ t0OldService = _dos_getvect(8); /*IRQ0*/\r
+ _dos_setvect(8,SDL_irq0);\r
+\r
+ _cli();\r
+ gvar->ca.sd.irq0_ticks = gvar->ca.sd.ptick = 0;\r
+ _sti();\r
+}\r
+\r
+void SD_ShutdownTimer()\r
+{\r
+ _dos_setvect(8,t0OldService);\r
+}\r
+\r
+void SD_imf_free_music(global_game_variables_t *gvar)\r
+{\r
+#ifndef SD_USESCAMMPM\r
+ if (gvar->ca.sd.imf_music) free(gvar->ca.sd.imf_music);\r
+#else\r
+ MM_FreePtr(MEMPTRCONV gvar->ca.audiosegs[0], gvar); //TODO make behave like id engine\r
+#endif\r
+ SD_imf_reset_music(gvar);\r
+}\r
+\r
+int SD_imf_load_music(const char *path, global_game_variables_t *gvar)\r
+{\r
+ unsigned long len;\r
+ unsigned char buf[8];\r
+ int fd;\r
+\r
+#ifndef SD_USESCAMMPM\r
+ SD_imf_free_music(gvar);\r
+#else\r
+ SD_imf_reset_music(gvar);\r
+#endif\r
+\r
+ fd = open(path,O_RDONLY|O_BINARY);\r
+ if (fd < 0) return 0;\r
+\r
+ len = lseek(fd,0,SEEK_END);\r
+ lseek(fd,0,SEEK_SET);\r
+ read(fd,buf,2);\r
+ if (buf[0] != 0 || buf[1] != 0) // type 1 IMF\r
+ len = *((uint16_t*)buf);\r
+ else\r
+ lseek(fd,0,SEEK_SET);\r
+\r
+ if (len == 0 || len > 65535UL) {\r
+ close(fd);\r
+ return 0;\r
+ }\r
+ len -= len & 3;\r
+\r
+#ifndef SD_USESCAMMPM\r
+ gvar->ca.sd.imf_music = malloc(len);\r
+#else\r
+ MM_GetPtr(MEMPTRCONV gvar->ca.audiosegs[0],len, gvar);\r
+ gvar->ca.sd.imf_music = (struct imf_entry *)gvar->ca.audiosegs[0];\r
+#endif\r
+ if (gvar->ca.sd.imf_music == NULL) {\r
+ close(fd);\r
+ return 0;\r
+ }\r
+ read(fd,gvar->ca.sd.imf_music,len);\r
+ close(fd);\r
+\r
+ gvar->ca.sd.imf_play_ptr = gvar->ca.sd.imf_music;\r
+ gvar->ca.sd.imf_music_end = gvar->ca.sd.imf_music + (len >> 2UL);\r
+ return 1;\r
+}\r
+\r
+void SD_imf_tick(global_game_variables_t *gvar)\r
+{\r
+ if (gvar->ca.sd.imf_delay_countdown == 0) {\r
+ do {\r
+ adlib_write(gvar->ca.sd.imf_play_ptr->reg,gvar->ca.sd.imf_play_ptr->data);\r
+ gvar->ca.sd.imf_delay_countdown = gvar->ca.sd.imf_play_ptr->delay;\r
+ gvar->ca.sd.imf_play_ptr++;\r
+ if (gvar->ca.sd.imf_play_ptr == gvar->ca.sd.imf_music_end)\r
+ {\r
+// printf("replay\n");\r
+ gvar->ca.sd.imf_play_ptr = gvar->ca.sd.imf_music;\r
+ }\r
+ } while (gvar->ca.sd.imf_delay_countdown == 0);\r
+ }\r
+ else {\r
+ gvar->ca.sd.imf_delay_countdown--;\r
+ }\r
+}\r
+\r
+void SD_adlib_shut_up() {\r
+ int i;\r
+\r
+ memset(adlib_fm,0,sizeof(adlib_fm));\r
+ memset(&adlib_reg_bd,0,sizeof(adlib_reg_bd));\r
+ for (i=0;i < adlib_fm_voices;i++) {\r
+ struct adlib_fm_operator *f;\r
+ f = &adlib_fm[i].mod;\r
+ f->ch_a = f->ch_b = f->ch_c = f->ch_d = 1;\r
+ f = &adlib_fm[i].car;\r
+ f->ch_a = f->ch_b = f->ch_c = f->ch_d = 1;\r
+ }\r
+\r
+ for (i=0;i < adlib_fm_voices;i++) {\r
+ struct adlib_fm_operator *f;\r
+\r
+ f = &adlib_fm[i].mod;\r
+ f->mod_multiple = 1;\r
+ f->total_level = 63 - 16;\r
+ f->attack_rate = 15;\r
+ f->decay_rate = 4;\r
+ f->sustain_level = 0;\r
+ f->release_rate = 8;\r
+ f->f_number = 400;\r
+ f->sustain = 1;\r
+ f->octave = 4;\r
+ f->key_on = 0;\r
+\r
+ f = &adlib_fm[i].car;\r
+ f->mod_multiple = 1;\r
+ f->total_level = 63 - 16;\r
+ f->attack_rate = 15;\r
+ f->decay_rate = 4;\r
+ f->sustain_level = 0;\r
+ f->release_rate = 8;\r
+ f->f_number = 0;\r
+ f->sustain = 1;\r
+ f->octave = 0;\r
+ f->key_on = 0;\r
+ }\r
+\r
+ adlib_apply_all();\r
+}\r
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