diff --git a/libctru/include/ctr/GPU.h b/libctru/include/ctr/GPU.h
index 1e3e55b..d1eac52 100644
--- a/libctru/include/ctr/GPU.h
+++ b/libctru/include/ctr/GPU.h
@@ -26,9 +26,22 @@ typedef enum{
 	GPU_ETC1A4=0xC
 }GPU_TEXCOLOR;
 
+typedef enum
+{
+	GL_NEVER = 0,
+	GL_ALWAYS = 1,
+	GL_EQUAL = 2,
+	GL_NOTEQUAL = 3,
+	GL_LESS = 4,
+	GL_LEQUAL = 5,
+	GL_GREATER = 6,
+	GL_GEQUAL = 7
+}GPU_TestFunction;
+
 void GPU_SetUniform(u32 startreg, u32* data, u32 numreg);
 void GPU_SetViewport(u32* depthBuffer, u32* colorBuffer, u32 x, u32 y, u32 w, u32 h);
 void GPU_DepthRange(float nearVal, float farVal);
+void GPU_SetDepthTest(bool enable, GPU_TestFunction function, u8 ref);
 void GPU_SetTexture(u32* data, u16 width, u16 height, u32 param, GPU_TEXCOLOR colorType);
 
 #endif
diff --git a/libctru/source/GPU.c b/libctru/source/GPU.c
index 7302e3d..558a4c7 100644
--- a/libctru/source/GPU.c
+++ b/libctru/source/GPU.c
@@ -276,6 +276,11 @@ void GPU_DepthRange(float nearVal, float farVal)
 	GPUCMD_AddSingleParam(0x000F004E, f32tof24(farVal));
 }
 
+void GPU_SetDepthTest(bool enable, GPU_TestFunction function, u8 ref)
+{
+	GPUCMD_AddSingleParam(0x000F0107, (enable&1)|((function&7)<<4)|(ref<<8));
+}
+
 void GPU_SetTexture(u32* data, u16 width, u16 height, u32 param, GPU_TEXCOLOR colorType)
 {
 	GPUCMD_AddSingleParam(0x000F008E, colorType);