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-rw-r--r--src/mesa/tnl/t_vb_arbprogram.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mesa/tnl/t_vb_arbprogram.h b/src/mesa/tnl/t_vb_arbprogram.h
index 92ae46113f..27f878c4e9 100644
--- a/src/mesa/tnl/t_vb_arbprogram.h
+++ b/src/mesa/tnl/t_vb_arbprogram.h
@@ -112,6 +112,10 @@ union instruction {
GLuint dword;
};
+
+/**
+ * Reduced swizzle is a 2-bit field; only X/Y/Z/W are allowed, not 0/1.
+ */
#define RSW_NOOP ((0<<0) | (1<<2) | (2<<4) | (3<<6))
#define GET_RSW(swz, idx) (((swz) >> ((idx)*2)) & 0x3)