+#define SH_WRITEMASK_0 0x1
+#define SH_WRITEMASK_1 0x2
+#define SH_WRITEMASK_2 0x4
+#define SH_WRITEMASK_3 0x8
+#define SH_WRITEMASK_ALL 0xf
+
+#define SH_DSTMOD_NONE 0x0
+#define SH_DSTMOD_SATURATE 0x1
+#define SH_DSTMOD_PARTIALPRECISION 0x2
+#define SH_DSTMOD_MSAMPCENTROID 0x4
+