Renamed folders to lowercase

1 files changed, 493 insertions, 0 deletions

diff --git a/src/System.c b/src/System.c
new file mode 100644
index 0000000..852fea1
--- /dev/null
+++ b/src/System.c
@@ -0,0 +1,493 @@
+/* *************************************
+ * 	Includes
+ * *************************************/
+
+#include "System.h"
+
+/* *************************************
+ * 	Defines
+ * *************************************/
+ 
+#define SYSTEM_MAX_TIMERS 16
+#define FILE_BUFFER_SIZE 0xC40
+#define END_STACK_PATTERN (uint32_t) 0x18022015
+#define BEGIN_STACK_ADDRESS (uint32_t*) 0x801FFF00
+#define STACK_SIZE 0x1000
+#define I_MASK (*(volatile unsigned int*)0x1F801074)
+
+/* *************************************
+ * 	Local Prototypes
+ * *************************************/
+
+static void SystemSetStackPattern(void);
+
+/* *************************************
+ * 	Local Variables
+ * *************************************/
+
+//Buffer to store any kind of files. It supports files up to 128 kB
+static uint8_t file_buffer[FILE_BUFFER_SIZE];
+//Global timer (called by interrupt)
+static volatile uint64_t global_timer;
+//Tells whether rand seed has been set
+static bool rand_seed;
+//Screen refresh flag (called by interrupt)
+static volatile bool refresh_needed;
+//Timers
+static bool one_second_timer;
+//Critical section is entered (i.e.: when accessing fopen() or other BIOS functions
+static volatile bool system_busy;
+
+/* *******************************************************************
+ * 
+ * @name: void SystemInit(void)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief: Calls main intialization routines.
+ * 
+ * @remarks: To be called before main loop.
+ * 
+ * *******************************************************************/
+
+void SystemInit(void)
+{
+	//Reset global timer
+	global_timer = 0;
+	//Reset 1 second timer
+	one_second_timer = 0;
+	//PSXSDK init
+	PSX_InitEx(PSX_INIT_SAVESTATE | PSX_INIT_CD);
+	//Graphics init
+	GsInit();
+	//Clear VRAM
+	GsClearMem();
+	//Set Video Resolution
+#ifdef _PAL_MODE_
+	GsSetVideoMode(X_SCREEN_RESOLUTION, Y_SCREEN_RESOLUTION, VMODE_PAL);
+#else
+	GsSetVideoMode(X_SCREEN_RESOLUTION, Y_SCREEN_RESOLUTION, VMODE_NTSC);
+#endif //_PAL_MODE_
+	//SPU init
+	SsInit();
+	//Set Drawing Environment
+	GfxInitDrawEnv();
+	//Set Display Environment
+	GfxInitDispEnv();
+	//Set Primitive List
+	GfxSetPrimitiveList();
+	//Initial value for system_busy
+	system_busy = false;
+	
+	GfxSetGlobalLuminance(NORMAL_LUMINANCE);
+
+	SystemSetStackPattern();
+}
+
+size_t SystemGetBufferSize(void)
+{
+    return sizeof(file_buffer);
+}
+
+/* *******************************************************************
+ * 
+ * @name: void SystemInit(void)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief:
+ * 	Calls srand() while avoiding multiple calls by setting internal
+ *	variable rand_seed to true. Internal variable "global_timer" is
+ *	used to generate the new seed.
+ * 
+ * @remarks:
+ * 	It is recommended to call it once user has pressed any key.
+ * 
+ * *******************************************************************/
+
+void SystemSetRandSeed(void)
+{
+	if(rand_seed == false)
+	{
+		rand_seed = true;
+		//Set random seed using global timer as reference
+		srand((unsigned int)global_timer);
+		
+		dprintf("Seed used: %d\n",(unsigned int)global_timer);
+	}
+}
+
+/* *******************************************************************
+ * 
+ * @name: bool SystemIsRandSeedSet(void)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief:
+ * 	Reportedly, returns whether rand seed has already been set.
+ * 
+ * @remarks:
+ *
+ * @return:
+ *	 Reportedly, returns whether rand seed has already been set.
+ * 
+ * *******************************************************************/
+
+bool SystemIsRandSeedSet(void)
+{
+	return rand_seed;
+}
+
+/* *******************************************************************
+ * 
+ * @name: bool SystemRefreshNeeded(void)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief:
+ * 
+ * @remarks:
+ *
+ * @return:
+ *	 Returns whether VSync flag has been enabled.
+ * 
+ * *******************************************************************/
+
+bool SystemRefreshNeeded(void)
+{
+	return refresh_needed;
+}
+
+/* *******************************************************************
+ * 
+ * @name: void ISR_SystemDefaultVBlank(void)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief:
+ * 
+ * @remarks:
+ * 	Called from VSync interrupt. Called 50 times a second in PAL mode,
+ * 	60 times a second in NTSC mode.
+ * 
+ * *******************************************************************/
+
+void ISR_SystemDefaultVBlank(void)
+{
+	refresh_needed = true;
+	SystemIncreaseGlobalTimer();
+}
+
+/* *******************************************************************
+ * 
+ * @name: void SystemIncreaseGlobalTimer(void)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief:
+ * 	Increases internal variable responsible for time handling.
+ * 
+ * @remarks:
+ * 	Usually called from ISR_SystemDefaultVBlank().
+ * 
+ * *******************************************************************/
+
+void SystemIncreaseGlobalTimer(void)
+{
+	global_timer++;
+}
+
+/* *******************************************************************
+ * 
+ * @name: uint64_t SystemGetGlobalTimer(void)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief: Returns internal global timer value.
+ * 
+ * *******************************************************************/
+
+uint64_t SystemGetGlobalTimer(void)
+{
+	return global_timer;
+}
+
+/* *******************************************************************
+ * 
+ * @name: void SystemDisableScreenRefresh(void)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief: Resets VBlank IRQ flag.
+ * 
+ * *******************************************************************/
+
+void SystemDisableScreenRefresh(void)
+{
+	refresh_needed = false;
+}
+
+/* *******************************************************************
+ * 
+ * @name: bool System1SecondTick(void)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @return: bool variable with a 1-cycle-length pulse that gets
+ * 			set each second.
+ * 
+ * *******************************************************************/
+
+bool System1SecondTick(void)
+{
+	return !(global_timer % REFRESH_FREQUENCY);
+}
+
+/* ****************************************************************************************
+ * 
+ * @name	bool SystemLoadFileToBuffer(char* fname, uint8_t* buffer, uint32_t szBuffer)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief:	Given an input path, it fills a buffer pointed to by "buffer" with
+ * 			maximum size "szBuffer" with data from CD-ROM.
+ *
+ * @return:	true if file has been loaded successfully, false otherwise.
+ * 
+ * ****************************************************************************************/
+
+bool SystemLoadFileToBuffer(char* fname, uint32_t init_pos, uint8_t* buffer, uint32_t szBuffer)
+{
+	FILE *f;
+	int32_t size;
+	
+	// Wait for possible previous operation from the GPU before entering this section.
+	while( (SystemIsBusy() == true) || (GfxIsGPUBusy() == true) );
+	
+	if(fname == NULL)
+	{
+		dprintf("SystemLoadFile: NULL fname!\n");
+		return false;
+	}
+	
+	memset(buffer,0,szBuffer);
+	
+	system_busy = true;
+	
+	SystemDisableVBlankInterrupt();
+	
+	f = fopen(fname, "r");
+	
+	if(f == NULL)
+	{
+		dprintf("SystemLoadFile: file could not be found!\n");
+		//File couldn't be found
+		return false;
+	}
+
+	fseek(f, init_pos, SEEK_END);
+
+	size = ftell(f);
+	
+	if(size > szBuffer)
+	{
+		dprintf("SystemLoadFile: Exceeds file buffer size (%d bytes)\n",size);
+		//Bigger than 128 kB (buffer's max size)
+		return false;
+	}
+	
+	fseek(f, init_pos, SEEK_SET); //f->pos = 0;
+	
+	fread(buffer, sizeof(char), size, f);
+	
+	fclose(f);
+	
+	SystemEnableVBlankInterrupt();
+	
+	system_busy = false;
+	
+	dprintf("File \"%s\" loaded successfully!\n",fname);
+	
+	return true;
+}
+
+void SystemSetBusyFlag(bool value)
+{
+    system_busy = value;
+}
+
+/* ****************************************************************************************
+ * 
+ * @name	bool SystemLoadFile(char*fname)
+ * 
+ * @author: Xavier Del Campo
+ * 
+ * @brief:	Given an input file name, it loads its conents into internal buffer.
+ *
+ * @return:	true if file has been loaded successfully, false otherwise.
+ * 
+ * ****************************************************************************************/
+
+bool SystemLoadFile(char*fname)
+{
+	return SystemLoadFileToBuffer(fname,0,file_buffer,sizeof(file_buffer));
+}
+
+/* ******************************************************************
+ * 
+ * @name	uint8_t* SystemGetBufferAddress(void)
+ * 
+ * @author: Xavier Del Campo
+ *
+ * @return:	Reportedly, returns internal buffer initial address.
+ * 
+ * *****************************************************************/
+
+uint8_t* SystemGetBufferAddress(void)
+{
+	return file_buffer;
+}
+
+/* ******************************************************************
+ * 
+ * @name	void SystemClearBuffer(void)
+ * 
+ * @author: Xavier Del Campo
+ *
+ * @return:	Fills internal buffer with zeros
+ * 
+ * *****************************************************************/
+
+void SystemClearBuffer(void)
+{
+	memset(file_buffer, 0, sizeof(file_buffer));
+}
+
+/* ******************************************************************
+ * 
+ * @name	uint32_t SystemRand(uint32_t min, uint32_t max)
+ * 
+ * @author: Xavier Del Campo
+ *
+ * @return:	random number between "min" and "max".
+ *
+ * @remarks: rand seed must be set before using this function, or
+ * 			 you will predictable values otherwise!
+ * 
+ * *****************************************************************/
+
+uint32_t SystemRand(uint32_t min, uint32_t max)
+{
+	return rand() % (max - min + 1) + min;
+}
+
+/* ***********************************************************************
+ * 
+ * @name	volatile bool SystemIsBusy(void)
+ * 
+ * @author: Xavier Del Campo
+ *
+ * @return:	returns system busy flag.
+ * 
+ * ***********************************************************************/
+
+volatile bool SystemIsBusy(void)
+{
+	return system_busy;
+}
+
+bool SystemArrayCompare(unsigned short* arr1, unsigned short* arr2, size_t sz)
+{
+	size_t i;
+	
+	for(i = 0; i < sz; i++)
+	{
+		if(arr1[i] != arr2[i])
+		{
+			return false;
+		}
+	}
+	
+	return true;
+}
+
+void SystemPrintStackPointerAddress(void)
+{
+#ifdef PSXSDK_DEBUG // Used to avoid unused variable warning
+	void * ptr = NULL;
+	fix16_t used_bytes = fix16_from_int((int)((void*)BEGIN_STACK_ADDRESS - (void*)&ptr));
+	fix16_t stackPercent = fix16_sdiv(used_bytes,fix16_from_int((int)STACK_SIZE));
+	
+	stackPercent = fix16_smul(stackPercent, fix16_from_int((int)100));
+	
+	dprintf("stackPercent: %d\n", stackPercent);
+	
+	dprintf("Stack begin pointer: 0x%08X\n"
+			"Stack pointer address: 0x%08X\n"
+			"Used %d%% of stack size.\n"
+			"\tUsed bytes: %d\n",
+			(void*)BEGIN_STACK_ADDRESS,
+			(void*)&ptr,
+			fix16_to_int(stackPercent),
+			fix16_to_int(used_bytes)	);
+#endif // PSXSDK_DEBUG
+
+}
+
+void SystemCheckStack(void)
+{
+	uint32_t * ptrStack = BEGIN_STACK_ADDRESS;
+	uint32_t data;
+	
+	ptrStack -= STACK_SIZE;
+	data = (*ptrStack);
+	
+	if(data != END_STACK_PATTERN)
+	{
+		dprintf("Stack overflow?\n");
+		
+		while(1);
+	}
+}
+
+void SystemSetStackPattern(void)
+{
+	uint32_t * ptrStack = BEGIN_STACK_ADDRESS;
+	
+	ptrStack -= STACK_SIZE;
+	
+	*ptrStack = END_STACK_PATTERN;
+}
+
+int32_t SystemIndexOfStringArray(char* str, char** array)
+{
+	int32_t i;
+	
+	for(i = 0; array[i] != NULL; i++)
+	{
+		dprintf("String to find: %s\nEntry: %s\n", str, array[i]);
+		
+		if(strcmp(str, array[i]) == 0)
+		{
+			dprintf("Match! Returning index %d...\n", i);
+			return i;
+		}
+	}
+	
+	return -1;
+}
+void SystemCyclicHandler(void)
+{	
+	SystemDisableScreenRefresh();
+	SystemCheckStack();
+}
+
+void SystemDisableVBlankInterrupt(void)
+{
+	I_MASK &= ~(0x00000001);
+}
+
+void SystemEnableVBlankInterrupt(void)
+{
+	I_MASK |= (0x00000001);
+}