fixed sdmc example

examples/sdmc/source/main.c

@@ -1,92 +1,19 @@
-#include <3ds/types.h>
-#include <3ds/srv.h>
-#include <3ds/svc.h>
-#include <3ds/gpu/gx.h>
-#include <3ds/services/apt.h>
-#include <3ds/services/gsp.h>
-#include <3ds/services/hid.h>
-#include <3ds/services/fs.h>
+///////////////////////////////////////
+//           SDMC example            //
+///////////////////////////////////////
+
+//this example shows you how to load a binary image file from the SD card and display it on the lower screen
+//for this to work you should copy test.bin to the root of your SD card
+//this file was generated with GIMP by saving a 240x320 image to raw RGB
+
+#include <3ds.h>
 #include "costable.h"
 
-u8* gspHeap;
-u32* gxCmdBuf;
-
-u8 currentBuffer;
-u8* topLeftFramebuffers[2];
-
-Handle gspEvent, gspSharedMemHandle;
-
-void gspGpuInit()
-{
-	gspInit();
-
-	GSPGPU_AcquireRight(NULL, 0x0);
-	GSPGPU_SetLcdForceBlack(NULL, 0x0);
-
-	//set subscreen to blue
-	u32 regData=0x01FF0000;
-	GSPGPU_WriteHWRegs(NULL, 0x202A04, &regData, 4);
-
-	//grab main left screen framebuffer addresses
-	GSPGPU_ReadHWRegs(NULL, 0x400468, (u32*)&topLeftFramebuffers, 8);
-
-	//convert PA to VA (assuming FB in VRAM)
-	topLeftFramebuffers[0]+=0x7000000;
-	topLeftFramebuffers[1]+=0x7000000;
-
-	//setup our gsp shared mem section
-	u8 threadID;
-	svcCreateEvent(&gspEvent, 0x0);
-	GSPGPU_RegisterInterruptRelayQueue(NULL, gspEvent, 0x1, &gspSharedMemHandle, &threadID);
-	svcMapMemoryBlock(gspSharedMemHandle, 0x10002000, 0x3, 0x10000000);
-
-	//map GSP heap
-	svcControlMemory((u32*)&gspHeap, 0x0, 0x0, 0x2000000, 0x10003, 0x3);
-
-	//wait until we can write stuff to it
-	svcWaitSynchronization(gspEvent, 0x55bcb0);
-
-	//GSP shared mem : 0x2779F000
-	gxCmdBuf=(u32*)(0x10002000+0x800+threadID*0x200);
-
-	currentBuffer=0;
-}
-
-void gspGpuExit()
-{
-	GSPGPU_UnregisterInterruptRelayQueue(NULL);
-
-	//unmap GSP shared mem
-	svcUnmapMemoryBlock(gspSharedMemHandle, 0x10002000);
-	svcCloseHandle(gspSharedMemHandle);
-	svcCloseHandle(gspEvent);
-	
-	gspExit();
-
-	//free GSP heap
-	svcControlMemory((u32*)&gspHeap, (u32)gspHeap, 0x0, 0x2000000, MEMOP_FREE, 0x0);
-}
-
-
-void swapBuffers()
-{
-	u32 regData;
-	GSPGPU_ReadHWRegs(NULL, 0x400478, &regData, 4);
-	regData^=1;
-	currentBuffer=regData&1;
-	GSPGPU_WriteHWRegs(NULL, 0x400478, &regData, 4);
-}
-
-void copyBuffer()
-{
-	//copy topleft FB
-	u8 copiedBuffer=currentBuffer^1;
-	u8* bufAdr=&gspHeap[0x46500*copiedBuffer];
-	GSPGPU_FlushDataCache(NULL, bufAdr, 0x46500);
-
-	GX_RequestDma(gxCmdBuf, (u32*)bufAdr, (u32*)topLeftFramebuffers[copiedBuffer], 0x46500);
-}
+//this will contain the data read from SDMC
+u8* buffer;
 
+//3DS has VFPs so we could just use cos
+//but we're old school so LUT4life
 s32 pcCos(u16 v)
 {
 	return costable[v&0x1FF];
@@ -94,71 +21,88 @@ s32 pcCos(u16 v)
 
 void renderEffect()
 {
-	u8* bufAdr=&gspHeap[0x46500*currentBuffer];
+	static int cnt;
+	u8* bufAdr=gfxGetFramebuffer(GFX_TOP, GFX_LEFT, NULL, NULL);
 
-	if(!currentBuffer)return;
 	int i, j;
 	for(i=1;i<400;i++)
 	{
 		for(j=1;j<240;j++)
 		{
 			u32 v=(j+i*240)*3;
-			bufAdr[v]=(pcCos(i)+4096)/32;
-			bufAdr[v+1]=0x00;
-			bufAdr[v+2]=0xFF*currentBuffer;
+			bufAdr[v]=(pcCos(i+cnt)+4096)/32;
+			bufAdr[v+1]=(pcCos(j-256+cnt)+4096)/64;
+			bufAdr[v+2]=(pcCos(i+128-cnt)+4096)/32;
 		}
 	}
+
+	cnt++;
 }
 
-int main()
+int main(int argc, char** argv)
 {
-	srvInit();
-		
-	aptInit(APPID_APPLICATION);
+	//initialize the services we're going to be using
+	srvInit(); //needed for everything
+	aptInit(); //needed for everything
+	hidInit(NULL); //needed for input
+	gfxInit(); //makes displaying to screen easier
+	fsInit(); //needed for filesystem stuff
 
-	gspGpuInit();
-
-	hidInit(NULL);
-
-	Handle fsuHandle;
-	srvGetServiceHandle(&fsuHandle, "fs:USER");
-	FSUSER_Initialize(fsuHandle);
-
-	Handle fileHandle;
+	u64 size;
 	u32 bytesRead;
+	Handle fileHandle;
+	//setup SDMC archive
 	FS_archive sdmcArchive=(FS_archive){ARCH_SDMC, (FS_path){PATH_EMPTY, 1, (u8*)""}};
-	FS_path filePath=(FS_path){PATH_CHAR, 10, (u8*)"/test.bin"};
-	FSUSER_OpenFileDirectly(fsuHandle, &fileHandle, sdmcArchive, filePath, FS_OPEN_READ, FS_ATTRIBUTE_NONE);
-	FSFILE_Read(fileHandle, &bytesRead, 0x0, (u32*)gspHeap, 0x46500);
-	FSFILE_Close(fileHandle);
+	//create file path struct (note : FS_makePath actually only supports PATH_CHAR, it will change in the future)
+	FS_path filePath=FS_makePath(PATH_CHAR, "/test.bin");
+
+	//open file
+	Result ret=FSUSER_OpenFileDirectly(NULL, &fileHandle, sdmcArchive, filePath, FS_OPEN_READ, FS_ATTRIBUTE_NONE);
+	//check for errors : exit if there is one
+	if(ret)goto exit;
+
+	//get file size
+	ret=FSFILE_GetSize(fileHandle, &size);
+	if(ret)goto exit;
+
+	//allocate a buffer on linear heap (could just be a malloc fwiw)
+	buffer=linearAlloc(size);
+	if(!buffer)goto exit;
+
+	//read contents !
+	ret=FSFILE_Read(fileHandle, &bytesRead, 0x0, buffer, size);
+	if(ret || size!=bytesRead)goto exit;
+
+	//close the file because we like being nice and tidy
+	ret=FSFILE_Close(fileHandle);
+	if(ret)goto exit;
 	
-	APP_STATUS status;
-	while((status=aptGetStatus())!=APP_EXITING)
+	while(aptMainLoop())
 	{
-		if(status==APP_RUNNING)
-		{
-			u32 PAD=hidSharedMem[7];
-			renderEffect();
-			swapBuffers();
-			copyBuffer();
-			u32 regData=PAD|0x01000000;
-			GSPGPU_WriteHWRegs(NULL, 0x202A04, &regData, 4);
-			svcSleepThread(1000000000);
-		}
-		else if(status == APP_SUSPENDING)
-		{
-			aptReturnToMenu();
-		}
-		else if(status == APP_SLEEPMODE)
-		{
-			aptWaitStatusEvent();
-		}
+		//exit when user hits B
+		hidScanInput();
+		if(keysHeld()&KEY_B)break;
+
+		//render rainbow
+		renderEffect();
+
+		//copy buffer to lower screen (don't have to do it every frame)
+		memcpy(gfxGetFramebuffer(GFX_BOTTOM, GFX_BOTTOM, NULL, NULL), buffer, size);
+
+		//wait & swap
+		gfxSwapBuffersGpu();
+		gspWaitForEvent(GSPEVENT_VBlank0, false);
 	}
 
-	svcCloseHandle(fsuHandle);
+	//cleanup and return
+	//returning from main() returns to hbmenu when run under ninjhax
+	exit:
+	//closing all handles is super important
+	svcCloseHandle(fileHandle);
+	//closing all services even more so
+	gfxExit();
 	hidExit();
-	gspGpuExit();
 	aptExit();
-	svcExitProcess();
+	srvExit();
 	return 0;
 }