From 69613a3914c21a3aac5f74200314f425766ba8d4 Mon Sep 17 00:00:00 2001
From: smea <smealum@gmail.com>
Date: Sun, 2 Mar 2014 16:55:05 +0100
Subject: [PATCH] GPU : command buffer stuff

---
 gpu/source/main.c         | 41 +++++----------------------------------
 libctru/include/ctr/GPU.h |  3 +++
 libctru/source/APT.c      |  2 +-
 libctru/source/GPU.c      | 28 ++++++++++++++++++++++++++
 libctru/source/GX.c       |  4 ++--
 5 files changed, 39 insertions(+), 39 deletions(-)

diff --git a/gpu/source/main.c b/gpu/source/main.c
index cea6362..64dc011 100644
--- a/gpu/source/main.c
+++ b/gpu/source/main.c
@@ -79,40 +79,8 @@ void swapBuffers()
 	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);
-}
-
-s32 pcCos(u16 v)
-{
-	return costable[v&0x1FF];
-}
-
-u32 cnt;
-
-void renderEffect()
-{
-	u8* bufAdr=&gspHeap[0x46500*currentBuffer];
-
-	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+cnt)+4096)/32;
-			bufAdr[v+1]=(pcCos(j-256+cnt)+4096)/64;
-			bufAdr[v+2]=(pcCos(i+128-cnt)+4096)/32;
-		}
-	}
-	cnt++;
-}
+u32 gpuCmd[0x100];
+u32 gpuCmdSize=0x100;
 
 int main()
 {
@@ -134,13 +102,14 @@ int main()
 		if(status==APP_RUNNING)
 		{
 			u32 PAD=hidSharedMem[7];
+			GPU_SetCommandBuffer(gpuCmd, gpuCmdSize, 0);
 			
 			u32 regData=PAD|0x01000000;
 			GSPGPU_WriteHWRegs(NULL, 0x202A04, &regData, 4);
 
-			renderEffect();
+			GPU_RunCommandBuffer(gxCmdBuf);
+
 			swapBuffers();
-			copyBuffer();
 		}
 		svc_sleepThread(16666666);
 	}
diff --git a/libctru/include/ctr/GPU.h b/libctru/include/ctr/GPU.h
index 8fd70ca..6af3acd 100644
--- a/libctru/include/ctr/GPU.h
+++ b/libctru/include/ctr/GPU.h
@@ -2,5 +2,8 @@
 #define GPU_H
 
 void GPU_Init(Handle *gsphandle);
+void GPU_SetCommandBuffer(u32* adr, u32 size, u32 offset);
+void GPU_RunCommandBuffer(u32* gxbuf);
+void GPU_AddCommand(u32* cmd, u32 length);
 
 #endif
diff --git a/libctru/source/APT.c b/libctru/source/APT.c
index e02a380..753219d 100644
--- a/libctru/source/APT.c
+++ b/libctru/source/APT.c
@@ -7,7 +7,7 @@
 #include <ctr/GSP.h>
 #include <ctr/svc.h>
 
-#define APT_HANDLER_STACKSIZE (0x10000)
+#define APT_HANDLER_STACKSIZE (0x1000)
 
 NS_APPID currentAppId;
 
diff --git a/libctru/source/GPU.c b/libctru/source/GPU.c
index ede428d..c9bc999 100644
--- a/libctru/source/GPU.c
+++ b/libctru/source/GPU.c
@@ -43,6 +43,10 @@ const u32 gpuRegTopScreenInitTable[]={0x1EF00400, 0x000001C2,
 								0x1EF00498, 0x18300000,
 								0x1EF00478, 0x18300000};
 
+u32* gpuCmdBuf;
+u32 gpuCmdBufSize;
+u32 gpuCmdBufOffset;
+
 Result writeRegisterValues(Handle* handle, u32* table, u32 num)
 {
 	if(!table || !num)return -1;
@@ -87,4 +91,28 @@ void GPU_Init(Handle *gsphandle)
 	
 	data=0x10501;
 	GSPGPU_WriteHWRegs(gsphandle, GSP_REBASE_REG(0x1EF00474), &data, 4);
+
+	gpuCmdBuf=NULL;
+	gpuCmdBufSize=0;
+	gpuCmdBufOffset=0;
+}
+
+void GPU_SetCommandBuffer(u32* adr, u32 size, u32 offset)
+{
+	gpuCmdBuf=adr;
+	gpuCmdBufSize=size;
+	gpuCmdBufOffset=offset;
+}
+
+void GPU_RunCommandBuffer(u32* gxbuf)
+{
+	GX_SetCommandList_Last(gxbuf, gpuCmdBuf, gpuCmdBufOffset*4, 0x3);
+}
+
+void GPU_AddCommand(u32* cmd, u32 length)
+{
+	if(!cmd || !gpuCmdBuf || gpuCmdBufOffset+length>gpuCmdBufSize)return;
+
+	memcpy(&gpuCmdBuf[gpuCmdBufOffset], cmd, length*4);
+	gpuCmdBufOffset+=length;
 }
diff --git a/libctru/source/GX.c b/libctru/source/GX.c
index ea4ccc3..18ac5dd 100644
--- a/libctru/source/GX.c
+++ b/libctru/source/GX.c
@@ -24,9 +24,9 @@ Result GX_SetCommandList_Last(u32* gxbuf, u32* buf0a, u32 buf0s, u8 flags)
 	gxCommand[0]=0x01; //CommandID
 	gxCommand[1]=(u32)buf0a; //buf0 address
 	gxCommand[2]=(u32)buf0s; //buf0 size
-	gxCommand[3]=flags&1;
+	gxCommand[3]=flags&1; //written to GSP module state
 	gxCommand[4]=gxCommand[5]=gxCommand[6]=0x0;
-	gxCommand[7]=(flags>>1)&1;
+	gxCommand[7]=(flags>>1)&1; //when non-zero, call svcFlushProcessDataCache() with the specified buffer
 
 	return GSPGPU_submitGxCommand(gxbuf, gxCommand, NULL);
 }