diff --git a/libctru/include/3ds/gpu/gpu.h b/libctru/include/3ds/gpu/gpu.h
index aaceb0a..16f5b8f 100644
--- a/libctru/include/3ds/gpu/gpu.h
+++ b/libctru/include/3ds/gpu/gpu.h
@@ -44,6 +44,26 @@ typedef enum
 	GPU_GEQUAL = 7
 }GPU_TESTFUNC;
 
+typedef enum
+{
+	GPU_KEEP = 0, 		// keep destination value
+	GPU_AND_NOT = 1, 	// destination & ~source
+	GPU_XOR = 5,		// destination ^ source
+	// 2 is the same as 1. Other values are too weird to even be usable.
+} GPU_STENCILOP;
+
+typedef enum
+{
+	GPU_WRITE_RED = 0x01,
+	GPU_WRITE_GREEN = 0x02,
+	GPU_WRITE_BLUE = 0x04,
+	GPU_WRITE_ALPHA = 0x08,
+	GPU_WRITE_DEPTH = 0x10,
+	
+	GPU_WRITE_COLOR = 0x0F,
+	GPU_WRITE_ALL = 0x1F
+} GPU_WRITEMASK;
+
 typedef enum
 {
 	GPU_BLEND_ADD = 0,
@@ -144,8 +164,9 @@ void GPU_SetViewport(u32* depthBuffer, u32* colorBuffer, u32 x, u32 y, u32 w, u3
 
 void GPU_DepthRange(float nearVal, float farVal);
 void GPU_SetAlphaTest(bool enable, GPU_TESTFUNC function, u8 ref);
-void GPU_SetDepthTest(bool enable, GPU_TESTFUNC function, u8 ref);
-void GPU_SetStencilTest(bool enable, GPU_TESTFUNC function, u8 ref);
+void GPU_SetDepthTestAndWriteMask(bool enable, GPU_TESTFUNC function, GPU_WRITEMASK writemask); // GPU_WRITEMASK values can be ORed together
+void GPU_SetStencilTest(bool enable, GPU_TESTFUNC function, u8 ref, u8 mask, u8 replace);
+void GPU_SetStencilOp(GPU_STENCILOP sfail, GPU_STENCILOP dfail, GPU_STENCILOP pass);
 void GPU_SetFaceCulling(GPU_CULLMODE mode);
 
 // these two can't be used together
@@ -154,6 +175,8 @@ void GPU_SetAlphaBlending(GPU_BLENDEQUATION colorEquation, GPU_BLENDEQUATION alp
 	GPU_BLENDFACTOR alphaSrc, GPU_BLENDFACTOR alphaDst);
 void GPU_SetColorLogicOp(GPU_LOGICOP op);
 
+void GPU_SetBlendingColor(u8 r, u8 g, u8 b, u8 a);
+
 void GPU_SetAttributeBuffers(u8 totalAttributes, u32* baseAddress, u64 attributeFormats, u16 attributeMask, u64 attributePermutation, u8 numBuffers, u32 bufferOffsets[], u64 bufferPermutations[], u8 bufferNumAttributes[]);
 
 void GPU_SetTextureEnable(GPU_TEXUNIT units); // GPU_TEXUNITx values can be ORed together to enable multiple texture units
diff --git a/libctru/source/gpu/gpu.c b/libctru/source/gpu/gpu.c
index 835f1ff..96ad76e 100644
--- a/libctru/source/gpu/gpu.c
+++ b/libctru/source/gpu/gpu.c
@@ -294,23 +294,25 @@ void GPU_SetAlphaTest(bool enable, GPU_TESTFUNC function, u8 ref)
 	GPUCMD_AddSingleParam(0x000F0104, (enable&1)|((function&7)<<4)|(ref<<8));
 }
 
-void GPU_SetStencilTest(bool enable, GPU_TESTFUNC function, u8 ref)
+void GPU_SetStencilTest(bool enable, GPU_TESTFUNC function, u8 ref, u8 mask, u8 replace)
 {
-	GPUCMD_AddSingleParam(0x000F0105, (enable&1)|((function&7)<<4)|(ref<<8));
+	GPUCMD_AddSingleParam(0x000F0105, (enable&1)|((function&7)<<4)|(replace<<8)|(ref<<16)|(mask<<24));
 }
 
-void GPU_SetDepthTest(bool enable, GPU_TESTFUNC function, u8 ref)
+void GPU_SetStencilOp(GPU_STENCILOP sfail, GPU_STENCILOP dfail, GPU_STENCILOP pass)
 {
-	GPUCMD_AddSingleParam(0x000F0107, (enable&1)|((function&7)<<4)|(ref<<8));
+	GPUCMD_AddSingleParam(0x000F0106, sfail | (dfail << 4) | (pass << 8));
+}
+
+void GPU_SetDepthTestAndWriteMask(bool enable, GPU_TESTFUNC function, GPU_WRITEMASK writemask)
+{
+	GPUCMD_AddSingleParam(0x000F0107, (enable&1)|((function&7)<<4)|(writemask<<8));
 }
 
 void GPU_SetAlphaBlending(GPU_BLENDEQUATION colorEquation, GPU_BLENDEQUATION alphaEquation, 
 	GPU_BLENDFACTOR colorSrc, GPU_BLENDFACTOR colorDst, 
 	GPU_BLENDFACTOR alphaSrc, GPU_BLENDFACTOR alphaDst)
 {
-	// TODO: fixed color
-	// it is controlled by command 0103 but I haven't found were to place said command without freezing the GPU
-	
 	GPUCMD_AddSingleParam(0x000F0101, colorEquation | (alphaEquation<<8) | (colorSrc<<16) | (colorDst<<20) | (alphaSrc<<24) | (alphaDst<<28));
 	GPUCMD_AddSingleParam(0x00020100, 0x00000100);
 }
@@ -321,6 +323,11 @@ void GPU_SetColorLogicOp(GPU_LOGICOP op)
 	GPUCMD_AddSingleParam(0x00020100, 0x00000000);
 }
 
+void GPU_SetBlendingColor(u8 r, u8 g, u8 b, u8 a)
+{
+	GPUCMD_AddSingleParam(0x000F0103, r | (g << 8) | (b << 16) | (a << 24));
+}
+
 void GPU_SetTextureEnable(GPU_TEXUNIT units)
 {
 	GPUCMD_AddSingleParam(0x0002006F, units<<8); 			// enables texcoord outputs