- brw_MOV(p, offset(m0, 2), ndc);
-
- if (intel->is_ironlake || intel->gen >= 6) {
- /* There are 20 DWs (D0-D19) in VUE vertex header on Ironlake */
- brw_MOV(p, offset(m0, 3), pos); /* a portion of vertex header */
- /* m4, m5 contain the distances from vertex to the user clip planeXXX.
- * Seems it is useless for us.
- * m6 is used for aligning, so that the remainder of vertex element is
- * reg-aligned.
- */
- brw_MOV(p, offset(m0, 7), pos); /* the remainder of vertex element */
- len_vertext_header = 6;
+
+ if (intel->gen >= 6) {
+ /* There are 16 DWs (D0-D15) in VUE header on Sandybridge:
+ * dword 0-3 (m1) of the header is indices, point width, clip flags.
+ * dword 4-7 (m2) is the 4D space position
+ * dword 8-15 (m3,m4) of the vertex header is the user clip distance.
+ * m5 is the first vertex data we fill, which is the vertex position.
+ */
+ brw_MOV(p, offset(m0, 2), pos);
+ brw_MOV(p, offset(m0, 5), pos);
+ len_vertex_header = 4;
+ } else if (intel->is_ironlake) {
+ /* There are 20 DWs (D0-D19) in VUE header on Ironlake:
+ * dword 0-3 (m1) of the header is indices, point width, clip flags.
+ * dword 4-7 (m2) is the ndc position (set above)
+ * dword 8-11 (m3) of the vertex header is the 4D space position
+ * dword 12-19 (m4,m5) of the vertex header is the user clip distance.
+ * m6 is a pad so that the vertex element data is aligned
+ * m7 is the first vertex data we fill, which is the vertex position.
+ */
+ brw_MOV(p, offset(m0, 2), ndc);
+ brw_MOV(p, offset(m0, 3), pos);
+ brw_MOV(p, offset(m0, 7), pos);
+ len_vertex_header = 6;