From: notaz <notasas@gmail.com>
Date: Sat, 13 Dec 2025 22:24:48 +0000 (+0200)
Subject: cdrom: new hacks for bios slowboot
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f8f99f573daaa15229b2a19bfc7bac9cd4c5ccb;p=pcsx_rearmed.git

cdrom: new hacks for bios slowboot

libretro/pcsx_rearmed#897
---

diff --git a/frontend/libretro.c b/frontend/libretro.c
index 407253e3..12119eeb 100644
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -2878,6 +2878,8 @@ static void update_variables(bool in_flight)
          Config.SlowBoot = 0;
          if (strcmp(var.value, "enabled") == 0)
             Config.SlowBoot = 1;
+         else if (strcmp(var.value, "enabled_no_pcsx") == 0)
+            Config.SlowBoot = 2;
       }
    }
 
diff --git a/frontend/libretro_core_options.h b/frontend/libretro_core_options.h
index 0fd5c177..dc272d9f 100644
--- a/frontend/libretro_core_options.h
+++ b/frontend/libretro_core_options.h
@@ -145,6 +145,7 @@ struct retro_core_option_v2_definition option_defs_us[] = {
       {
          { "disabled", NULL },
          { "enabled",  NULL },
+         { "enabled_no_pcsx", "ON, w/o PCSXtm" },
          { NULL, NULL },
       },
       "disabled",
diff --git a/frontend/menu.c b/frontend/menu.c
index 9717845e..18377e21 100644
--- a/frontend/menu.c
+++ b/frontend/menu.c
@@ -1535,6 +1535,7 @@ static int menu_loop_plugin_spu(int id, int keys)
 }
 
 static const char *men_gpu_dithering[] = { "OFF", "ON", "Force", NULL };
+static const char *men_bios_boot[] = { "OFF", "ON", "ON w/o PCSX", NULL };
 
 static const char h_bios[]       = "HLE is simulated BIOS. BIOS selection is saved in\n"
 				   "savestates and can't be changed there. Must save\n"
@@ -1596,9 +1597,12 @@ static int menu_loop_pluginsel_options(int id, int keys)
 	return 0;
 }
 
+static int slowboot_sel;
+
 static menu_entry e_menu_plugin_options[] =
 {
 	mee_enum_h    ("BIOS",                          0, bios_sel, bioses, h_bios),
+	mee_enum      ("BIOS logo (slow boot)",         0, slowboot_sel, men_bios_boot),
 	mee_enum      ("GPU Dithering",                 0, pl_rearmed_cbs.dithering, men_gpu_dithering),
 	mee_enum_h    ("GPU plugin",                    0, gpu_plugsel, gpu_plugins, h_plugin_gpu),
 	mee_enum_h    ("SPU plugin",                    0, spu_plugsel, spu_plugins, h_plugin_spu),
@@ -1612,7 +1616,9 @@ static menu_entry e_menu_main2[];
 static int menu_loop_plugin_options(int id, int keys)
 {
 	static int sel = 0;
+	slowboot_sel = Config.SlowBoot;
 	me_loop(e_menu_plugin_options, &sel);
+	Config.SlowBoot = slowboot_sel;
 
 	// sync BIOS/plugins
 	snprintf(Config.Bios, sizeof(Config.Bios), "%s", bioses[bios_sel]);
@@ -2135,7 +2141,7 @@ static int run_bios(void)
 	ready_to_go = 0;
 	if (reload_plugins(NULL) != 0)
 		return -1;
-	Config.SlowBoot = 1;
+	Config.SlowBoot = 2;
 	SysReset();
 	Config.SlowBoot = origSlowBoot;
 
diff --git a/libpcsxcore/cdrom.c b/libpcsxcore/cdrom.c
index 6014db59..ed2a1cdd 100644
--- a/libpcsxcore/cdrom.c
+++ b/libpcsxcore/cdrom.c
@@ -1211,8 +1211,20 @@ void cdrInterrupt(void) {
 			CDR_LOG_I("CdlID: %02x %02x %02x %02x\n", cdr.Result[0],
 				cdr.Result[1], cdr.Result[2], cdr.Result[3]);
 
-			/* This adds the string "PCSX" in Playstation bios boot screen */
-			memcpy((char *)&cdr.Result[4], "PCSX", 4);
+			/* 4-char string in Playstation bios boot screen */
+			if (Config.SlowBoot == 1)
+				memcpy(&cdr.Result[4], "PCSX", 4);
+			else {
+				cdr.Result[4] = 'S';
+				cdr.Result[5] = 'C';
+				cdr.Result[6] = 'E';
+				if (Config.PsxType == PSX_TYPE_PAL)
+					cdr.Result[7] = 'E';
+				else if (CdromId[2] == 'P' || CdromId[2] == 'p')
+					cdr.Result[7] = 'I';
+				else
+					cdr.Result[7] = 'A';
+			}
 			IrqStat = Complete;
 			break;
 
@@ -1236,6 +1248,13 @@ void cdrInterrupt(void) {
 		case CdlReadToc + CMD_WHILE_NOT_READY:
 			cdr.LocL[0] = LOCL_INVALID;
 			second_resp_time = cdReadTime * 180 / 4;
+			if (!Config.HLE && Config.SlowBoot) {
+				// hack: compensate cdrom being emulated too fast
+				// and bios finishing before the reverb decays
+				second_resp_time += cdReadTime * 75*2;
+				if ((psxRegs.pc >> 28) == 0x0b)
+					second_resp_time += cdReadTime * 75*3;
+			}
 			start_rotating = 1;
 			break;
 
diff --git a/libpcsxcore/psxcommon.h b/libpcsxcore/psxcommon.h
index 53c23f16..22574f80 100644
--- a/libpcsxcore/psxcommon.h
+++ b/libpcsxcore/psxcommon.h
@@ -132,7 +132,7 @@ typedef struct {
 	boolean Cdda;
 	boolean CHD_Precache; /* loads disk image into memory, works with CHD only. */
 	boolean HLE;
-	boolean SlowBoot;
+	uint8_t SlowBoot; // 0 = off, 1 = on, 2 = on, no PCSX 'ad'
 	boolean Debug;
 	boolean PsxOut;
 	boolean icache_emulation;