From: Eric Anholt <eric@anholt.net>
Date: Fri, 8 Oct 2010 18:14:48 +0000 (-0700)
Subject: i965: Fix new FS gen6 interpolation for sparsely-populated arrays.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cac04a93974e7ae773b84e000a2b26391ee2f4bb;p=mesa.git

i965: Fix new FS gen6 interpolation for sparsely-populated arrays.

We'd overwrite the same element twice.
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 710eb0bb721..bc49ee8fe0d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -813,9 +813,9 @@ fs_visitor::emit_general_interpolation(ir_variable *ir)
 			 fs_reg(interp)));
 	    attr.reg_offset++;
 	 }
-	 attr.reg_offset -= type->vector_elements;
 
 	 if (intel->gen < 6) {
+	    attr.reg_offset -= type->vector_elements;
 	    for (unsigned int c = 0; c < type->vector_elements; c++) {
 	       emit(fs_inst(BRW_OPCODE_MUL,
 			    attr,