From eafe85d96b0e0381f9368b317f1a383a8f218976 Mon Sep 17 00:00:00 2001
From: Sulter <Sulter@users.noreply.github.com>
Date: Sun, 26 Jul 2020 19:28:29 +0200
Subject: [PATCH] Added fast-forward functionality

---
 Source/Config/ConfigOptions.cpp        |  1 +
 Source/Config/ConfigOptions.h          |  1 +
 Source/Core/CPU.cpp                    |  3 +-
 Source/HLEAudio/AudioBuffer.cpp        |  2 +-
 Source/SysVita/UI/InGameMenuScreen.cpp | 46 +++++++++++++++++++++++---
 Source/SysVita/UI/Menu.h               | 18 ++++++++++
 6 files changed, 65 insertions(+), 6 deletions(-)

diff --git a/Source/Config/ConfigOptions.cpp b/Source/Config/ConfigOptions.cpp
index c4ecd429..a4d1aacb 100644
--- a/Source/Config/ConfigOptions.cpp
+++ b/Source/Config/ConfigOptions.cpp
@@ -44,5 +44,6 @@ bool	gFogEnabled					= false;	// Enable fog
 bool    gMemoryAccessOptimisation   = false;	// Enable the memory access optimisation
 bool	gCheatsEnabled				= true;		// Enable cheat codes
 u32		gControllerIndex			= 0;		// Which controller config to set
+bool	gFastForward                = false;
 
 DaedalusConfig g_DaedalusConfig;
diff --git a/Source/Config/ConfigOptions.h b/Source/Config/ConfigOptions.h
index 6839936e..779650e9 100644
--- a/Source/Config/ConfigOptions.h
+++ b/Source/Config/ConfigOptions.h
@@ -49,6 +49,7 @@ extern bool gVideoRateMatch;
 extern bool gFogEnabled;
 extern bool gMemoryAccessOptimisation;
 extern bool gCheatsEnabled;
+extern bool gFastForward;
 //ToDo: Needs moving to Graphics plugin config
 extern bool	gCleanSceneEnabled;
 extern u32	gCheckTextureHashFrequency;
diff --git a/Source/Core/CPU.cpp b/Source/Core/CPU.cpp
index 67e453cb..c88ef1ac 100644
--- a/Source/Core/CPU.cpp
+++ b/Source/Core/CPU.cpp
@@ -673,7 +673,8 @@ void CPU_HANDLE_COUNT_INTERRUPT()
 
 			gVerticalInterrupts++;
 
-			FramerateLimiter_Limit();
+			if(!gFastForward)
+				FramerateLimiter_Limit();
 #ifdef DAEDALUS_W32
 			if (gAudioPlugin != nullptr)
 				gAudioPlugin->Update(false);
diff --git a/Source/HLEAudio/AudioBuffer.cpp b/Source/HLEAudio/AudioBuffer.cpp
index 669c06f5..bfba77b6 100644
--- a/Source/HLEAudio/AudioBuffer.cpp
+++ b/Source/HLEAudio/AudioBuffer.cpp
@@ -121,7 +121,7 @@ void CAudioBuffer::AddSamples( const Sample * samples, u32 num_samples, u32 freq
 		if( write_ptr >= mBufferEnd )
 			write_ptr = mBufferBegin;
 
-		while( write_ptr == read_ptr )
+		while( write_ptr == read_ptr && !gFastForward)
 		{
 			// The buffer is full - spin until the read pointer advances.
 			//    Note - spends a lot of time here if program is running
diff --git a/Source/SysVita/UI/InGameMenuScreen.cpp b/Source/SysVita/UI/InGameMenuScreen.cpp
index a94b3d2b..ca5dc240 100644
--- a/Source/SysVita/UI/InGameMenuScreen.cpp
+++ b/Source/SysVita/UI/InGameMenuScreen.cpp
@@ -30,8 +30,37 @@
 #include "SysVita/UI/Menu.h"
 
 static uint64_t tmr1;
-static uint32_t oldpad;
 bool pause_emu = false;
+ButtonSce selectBtn {false, 0, 500000, SCE_CTRL_SELECT};
+
+int update_button(ButtonSce* btn, const SceCtrlData* pad, uint32_t ticks)
+{
+	if ((pad->buttons & btn->btn) && !btn->down){
+		btn->down = true;
+		btn->downTime = ticks;
+		return BUTTON_SHORT_HOLD;
+	} else if (!(pad->buttons & btn->btn) && btn->down){
+		btn->down = false;
+		uint32_t deltaTime = ticks - btn->downTime;
+		if(deltaTime > btn->longPressTime){
+			return BUTTON_LONG_RELEASED;
+		}
+		else {
+			return BUTTON_SHORT_RELEASED;
+		}
+	} else if ((pad->buttons & btn->btn) && btn->down){
+		uint32_t deltaTime = ticks - btn->downTime;
+		if(deltaTime > btn->longPressTime){
+			return BUTTON_LONG_HOLD;
+		}
+		else {
+			return BUTTON_SHORT_HOLD;
+		}
+	}
+	else {
+		return BUTTON_NEUTRAL;
+	}
+}
 
 void DrawInGameMenu() {
 	DrawInGameMenuBar();
@@ -53,12 +82,21 @@ void DrawInGameMenu() {
 		show_menubar = !gHideMenubar;
 	}
 	
-	// Handling emulation pause
+	// Handling select button (menu pause and fast-forward)
 	SceCtrlData pad;
 	sceCtrlPeekBufferPositive(0, &pad, 1);
-	if ((pad.buttons & SCE_CTRL_SELECT) && (!(oldpad & SCE_CTRL_SELECT))) {
+	int statusSelectBtn = update_button(&selectBtn, &pad, sceKernelGetProcessTimeWide());
+	if(statusSelectBtn == BUTTON_SHORT_RELEASED){
 		pause_emu = !pause_emu;
 		EnableMenuButtons(pause_emu);
+	} else if(statusSelectBtn == BUTTON_LONG_HOLD){
+		if(!gFastForward && !pause_emu){
+			gFastForward = true;
+			vglWaitVblankStart(GL_FALSE);
+		}
+	}
+	else if(statusSelectBtn == BUTTON_LONG_RELEASED){
+		gFastForward = false;
+		vglWaitVblankStart(gUseVSync);
 	}
-	oldpad = pad.buttons;
 }
diff --git a/Source/SysVita/UI/Menu.h b/Source/SysVita/UI/Menu.h
index 7a9b3be7..cf269170 100644
--- a/Source/SysVita/UI/Menu.h
+++ b/Source/SysVita/UI/Menu.h
@@ -246,6 +246,15 @@ enum {
 	MEM_DOWNLOAD
 };
 
+// Button status types
+enum {
+	BUTTON_SHORT_HOLD,
+	BUTTON_SHORT_RELEASED,
+	BUTTON_LONG_HOLD,
+	BUTTON_LONG_RELEASED,
+	BUTTON_NEUTRAL
+};
+
 struct Download {
 	void (*post_func)();
 	char url[256];
@@ -277,6 +286,13 @@ struct Overlay {
 	Overlay *next;
 };
 
+struct ButtonSce {
+	bool down;
+	uint32_t downTime;
+	uint32_t longPressTime;
+	const SceCtrlButtons btn;
+};
+
 extern Dialog cur_dialog;
 extern Alert cur_alert;
 extern Download cur_download;
@@ -349,3 +365,5 @@ void extract_file(char *file, char *dir);
 int download_file(char *url, char *file, char *msg, float int_total_bytes, bool has_temp_file);
 
 void dummy_func();
+
+int update_button(ButtonSce* btn, const SceCtrlData* pad, uint32_t ticks);