diff --git a/examples/graphics/gpu/geoshader/source/gpu.c b/examples/graphics/gpu/geoshader/source/gpu.c
index abb8cdd..60b4b89 100644
--- a/examples/graphics/gpu/geoshader/source/gpu.c
+++ b/examples/graphics/gpu/geoshader/source/gpu.c
@@ -35,11 +35,12 @@ void gpuClearBuffers(u32 clearColor)
 
 void gpuFrameBegin(void)
 {
-	// Configure the viewport and the depth linear conversion function
-	GPU_SetViewport(
+	// Configure the output buffers, viewport and the depth linear conversion function
+	GPU_OutputBuffers(GPU_DEPTH24_EXT8, GPU_COLOR_RGBA8, 
 		(u32*)osConvertVirtToPhys((u32)depthBuf),
 		(u32*)osConvertVirtToPhys((u32)colorBuf),
-		0, 0, 240, 400); // The top screen is physically 240x400 pixels
+		240, 400); // The top screen is physically 240x400 pixels
+	GPU_SetViewport(0, 0, 240, 400); 
 	GPU_DepthMap(-1.0f, 0.0f); // calculate the depth value from the Z coordinate in the following way: -1.0*z + 0.0
 
 	// Configure some boilerplate
diff --git a/examples/graphics/gpu/simple_tri/source/gpu.c b/examples/graphics/gpu/simple_tri/source/gpu.c
index abb8cdd..60b4b89 100644
--- a/examples/graphics/gpu/simple_tri/source/gpu.c
+++ b/examples/graphics/gpu/simple_tri/source/gpu.c
@@ -35,11 +35,12 @@ void gpuClearBuffers(u32 clearColor)
 
 void gpuFrameBegin(void)
 {
-	// Configure the viewport and the depth linear conversion function
-	GPU_SetViewport(
+	// Configure the output buffers, viewport and the depth linear conversion function
+	GPU_OutputBuffers(GPU_DEPTH24_EXT8, GPU_COLOR_RGBA8, 
 		(u32*)osConvertVirtToPhys((u32)depthBuf),
 		(u32*)osConvertVirtToPhys((u32)colorBuf),
-		0, 0, 240, 400); // The top screen is physically 240x400 pixels
+		240, 400); // The top screen is physically 240x400 pixels
+	GPU_SetViewport(0, 0, 240, 400); 
 	GPU_DepthMap(-1.0f, 0.0f); // calculate the depth value from the Z coordinate in the following way: -1.0*z + 0.0
 
 	// Configure some boilerplate
diff --git a/examples/graphics/gpu/textured_cube/source/gpu.c b/examples/graphics/gpu/textured_cube/source/gpu.c
index abb8cdd..60b4b89 100644
--- a/examples/graphics/gpu/textured_cube/source/gpu.c
+++ b/examples/graphics/gpu/textured_cube/source/gpu.c
@@ -35,11 +35,12 @@ void gpuClearBuffers(u32 clearColor)
 
 void gpuFrameBegin(void)
 {
-	// Configure the viewport and the depth linear conversion function
-	GPU_SetViewport(
+	// Configure the output buffers, viewport and the depth linear conversion function
+	GPU_OutputBuffers(GPU_DEPTH24_EXT8, GPU_COLOR_RGBA8, 
 		(u32*)osConvertVirtToPhys((u32)depthBuf),
 		(u32*)osConvertVirtToPhys((u32)colorBuf),
-		0, 0, 240, 400); // The top screen is physically 240x400 pixels
+		240, 400); // The top screen is physically 240x400 pixels
+	GPU_SetViewport(0, 0, 240, 400); 
 	GPU_DepthMap(-1.0f, 0.0f); // calculate the depth value from the Z coordinate in the following way: -1.0*z + 0.0
 
 	// Configure some boilerplate
diff --git a/libctru/include/3ds/gpu/gpu.h b/libctru/include/3ds/gpu/gpu.h
index 5a48103..829c5e3 100644
--- a/libctru/include/3ds/gpu/gpu.h
+++ b/libctru/include/3ds/gpu/gpu.h
@@ -50,6 +50,21 @@ typedef enum
 	GPU_MIRRORED_REPEAT = 0x3,
 }GPU_TEXTURE_WRAP_PARAM;
 
+typedef enum
+{
+	GPU_COLOR_RGBA8		= 0x00002,
+	GPU_COLOR_RGBA5551	= 0x20000,
+	GPU_COLOR_RGB565  	= 0x30000,
+	GPU_COLOR_RGBA4		= 0x40000
+} GPU_COLOR_FORMAT;
+
+typedef enum
+{
+	GPU_DEPTH16		= 0x00000,
+	GPU_DEPTH24		= 0x00002,
+	GPU_DEPTH24_EXT8	= 0x00003
+} GPU_DEPTH_FORMAT;
+
 typedef enum
 {
 	GPU_TEXUNIT0 = 0x1,
@@ -260,7 +275,8 @@ typedef enum{
 
 void GPU_SetFloatUniform(GPU_SHADER_TYPE type, u32 startreg, u32* data, u32 numreg);
 
-void GPU_SetViewport(u32* depthBuffer, u32* colorBuffer, u32 x, u32 y, u32 w, u32 h);
+void GPU_OutputBuffers(GPU_DEPTH_FORMAT depth, GPU_COLOR_FORMAT color, u32* depthBuffer, u32* colorBuffer, u32 w, u32 h);
+void GPU_SetViewport(u32 x, u32 y, u32 w, u32 h);
 
 void GPU_SetScissorTest(GPU_SCISSORMODE mode, u32 x, u32 y, u32 w, u32 h);
 
diff --git a/libctru/source/gpu/gpu.c b/libctru/source/gpu/gpu.c
index 723b65b..6664b6d 100644
--- a/libctru/source/gpu/gpu.c
+++ b/libctru/source/gpu/gpu.c
@@ -291,11 +291,10 @@ static u32 f32tof31(float f)
 }
 
 //takes PAs as arguments
-void GPU_SetViewport(u32* depthBuffer, u32* colorBuffer, u32 x, u32 y, u32 w, u32 h)
+
+void GPU_OutputBuffers(GPU_DEPTH_FORMAT depth, GPU_COLOR_FORMAT color, u32* depthBuffer, u32* colorBuffer, u32 w, u32 h)
 {
 	u32 param[0x4];
-	float fw=(float)w;
-	float fh=(float)h;
 
 	GPUCMD_AddWrite(GPUREG_0111, 0x00000001);
 	GPUCMD_AddWrite(GPUREG_0110, 0x00000001);
@@ -308,9 +307,23 @@ void GPU_SetViewport(u32* depthBuffer, u32* colorBuffer, u32 x, u32 y, u32 w, u3
 	GPUCMD_AddIncrementalWrites(GPUREG_DEPTHBUFFER_LOC, param, 0x00000003);
 
 	GPUCMD_AddWrite(GPUREG_006E, f116e);
-	GPUCMD_AddWrite(GPUREG_DEPTHBUFFER_FORMAT, 0x00000003); //depth buffer format
-	GPUCMD_AddWrite(GPUREG_COLORBUFFER_FORMAT, 0x00000002); //color buffer format
-	GPUCMD_AddWrite(GPUREG_011B, 0x00000000); //?
+	GPUCMD_AddWrite(GPUREG_DEPTHBUFFER_FORMAT, depth); //depth buffer format
+	GPUCMD_AddWrite(GPUREG_COLORBUFFER_FORMAT, color); //color buffer format
+	GPUCMD_AddWrite(GPUREG_BLOCKMODE, 0x00000000); //block mode (0x0 = 8x8, 0x1 = 32x32)
+
+	//enable depth buffer
+	param[0x0]=0x0000000F;
+	param[0x1]=0x0000000F;
+	param[0x2]=0x00000002;
+	param[0x3]=0x00000002;
+	GPUCMD_AddIncrementalWrites(GPUREG_0112, param, 0x00000004);
+}
+
+void GPU_SetViewport(u32 x, u32 y, u32 w, u32 h)
+{
+	u32 param[0x4];
+	float fw=(float)w;
+	float fh=(float)h;
 
 	param[0x0]=f32tof24(fw/2);
 	param[0x1]=f32tof31(2.0f / fw) << 1;
@@ -324,13 +337,6 @@ void GPU_SetViewport(u32* depthBuffer, u32* colorBuffer, u32 x, u32 y, u32 w, u3
 	param[0x1]=0x00000000;
 	param[0x2]=((h-1)<<16)|((w-1)&0xFFFF);
 	GPUCMD_AddIncrementalWrites(GPUREG_SCISSORTEST_MODE, param, 0x00000003);
-
-	//enable depth buffer
-	param[0x0]=0x0000000F;
-	param[0x1]=0x0000000F;
-	param[0x2]=0x00000002;
-	param[0x3]=0x00000002;
-	GPUCMD_AddIncrementalWrites(GPUREG_0112, param, 0x00000004);
 }
 
 void GPU_SetScissorTest(GPU_SCISSORMODE mode, u32 x, u32 y, u32 w, u32 h)