From bffbc975e201e07565c261fcf99d75cc027ebcff Mon Sep 17 00:00:00 2001
From: smea <smealum@gmail.com>
Date: Wed, 12 Mar 2014 20:11:34 +0100
Subject: [PATCH] GPU : added buffer setup commands to GPU_SetViewport

---
 gpu/source/main.c         |  8 +++++++-
 libctru/include/ctr/GPU.h |  2 +-
 libctru/source/GPU.c      | 35 +++++++++++++++++++++++++++++------
 3 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/gpu/source/main.c b/gpu/source/main.c
index d521482..073db12 100644
--- a/gpu/source/main.c
+++ b/gpu/source/main.c
@@ -114,7 +114,13 @@ int main()
 			GSPGPU_WriteHWRegs(NULL, 0x202A04, &regData, 4);
 
 			GPUCMD_SetBuffer(gpuCmd, gpuCmdSize, 0);
-			GPUCMD_AddSingleParam(0x0008025E, 0x00000000);
+
+				//depth buffer in VRAM, color buffer in FCRAM (gspHeap)
+				//(no real reasoning behind this configuration)
+				GPU_SetViewport((u32*)0x18000000,(u32*)0x20000000,0,0,240*2,400);
+				SHDR_UseProgram(shader, 0);
+				GPUCMD_AddSingleParam(0x0008025E, 0x00000000);
+
 			GPUCMD_Finalize();
 			GPUCMD_Run(gxCmdBuf);
 
diff --git a/libctru/include/ctr/GPU.h b/libctru/include/ctr/GPU.h
index 47189b7..1a9e3b6 100644
--- a/libctru/include/ctr/GPU.h
+++ b/libctru/include/ctr/GPU.h
@@ -11,6 +11,6 @@ void GPUCMD_AddSingleParam(u32 cmd, u32 param);
 void GPUCMD_Finalize();
 
 void GPU_SetUniform(u32 startreg, u32* data, u32 numreg);
-void GPU_SetViewport(u32 x, u32 y, float w, float h);
+void GPU_SetViewport(u32* depthBuffer, u32* colorBuffer, u32 x, u32 y, u32 w, u32 h);
 
 #endif
diff --git a/libctru/source/GPU.c b/libctru/source/GPU.c
index 08019bd..e7af939 100644
--- a/libctru/source/GPU.c
+++ b/libctru/source/GPU.c
@@ -222,7 +222,7 @@ u32 computeInvValue(u32 val)
 	u32 tmp3=*((u32*)&fval);
 	tmp1=(tmp3<<9)>>9;
 	tmp2=tmp3&(~0x80000000);
-	if(tmp3&(~0x80000000))
+	if(tmp2)
 	{
 		tmp1=(tmp3<<9)>>9;
 		int tmp=((tmp3<<1)>>24)-0x40;
@@ -233,15 +233,38 @@ u32 computeInvValue(u32 val)
 	return (tmp1|(tmp2<<23)|(tmp3<<30))<<1;
 }
 
-void GPU_SetViewport(u32 x, u32 y, float w, float h)
+//takes PAs as arguments
+void GPU_SetViewport(u32* depthBuffer, u32* colorBuffer, u32 x, u32 y, u32 w, u32 h)
 {
 	u32 param[0x4];
+	float fw=(float)w;
+	float fh=(float)h;
 
-	param[0x0]=f32tof24(w/2);
-	param[0x1]=computeInvValue(w);
-	param[0x2]=f32tof24(h/2);
-	param[0x3]=computeInvValue(h);
+	GPUCMD_AddSingleParam(0x000F0111, 0x00000001);
+	GPUCMD_AddSingleParam(0x000F0110, 0x00000001);
+
+	u32 f116e=0x01000000|(((h-1)&0xFFF)<<12)|(w&0xFFF);
+
+	param[0x0]=((u32)depthBuffer)>>3;
+	param[0x1]=((u32)colorBuffer)>>3;
+	param[0x2]=f116e;
+	GPUCMD_Add(0x800F011C, param, 0x00000003);
+
+	GPUCMD_AddSingleParam(0x000F006E, f116e);
+	GPUCMD_AddSingleParam(0x000F0116, 0x00000003); //?
+	GPUCMD_AddSingleParam(0x000F0117, 0x00000002); //?
+	GPUCMD_AddSingleParam(0x000F011B, 0x00000000); //?
+
+	param[0x0]=f32tof24(fw/2);
+	param[0x1]=computeInvValue(fw);
+	param[0x2]=f32tof24(fh/2);
+	param[0x3]=computeInvValue(fh);
 	GPUCMD_Add(0x800F0041, param, 0x00000004);
 
 	GPUCMD_AddSingleParam(0x000F0068, (y<<16)|(x&0xFFFF));
+
+	param[0x0]=0x00000000;
+	param[0x1]=0x00000000;
+	param[0x2]=((h-1)<<16)|((w-1)&0xFFFF);
+	GPUCMD_Add(0x800F0065, param, 0x00000003);
 }