From: Eric Anholt <eric@anholt.net>
Date: Mon, 13 Dec 2010 21:37:54 +0000 (-0800)
Subject: i965: Fix gl_FragCoord.z setup on gen6.
X-Git-Tag: mesa-7.11-rc1~3224
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=036c817f77f71e7c4b17571ae100a9bc93d8fe5b;p=platform%2Fupstream%2Fmesa.git

i965: Fix gl_FragCoord.z setup on gen6.

Fixes glsl-bug-22603.
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index c3cbe0d..4eead32 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -474,8 +474,13 @@ fs_visitor::emit_fragcoord_interpolation(ir_variable *ir)
    wpos.reg_offset++;
 
    /* gl_FragCoord.z */
-   emit(fs_inst(FS_OPCODE_LINTERP, wpos, this->delta_x, this->delta_y,
-		interp_reg(FRAG_ATTRIB_WPOS, 2)));
+   if (intel->gen >= 6) {
+      emit(fs_inst(BRW_OPCODE_MOV, wpos,
+		   fs_reg(brw_vec8_grf(c->source_depth_reg, 0))));
+   } else {
+      emit(fs_inst(FS_OPCODE_LINTERP, wpos, this->delta_x, this->delta_y,
+		   interp_reg(FRAG_ATTRIB_WPOS, 2)));
+   }
    wpos.reg_offset++;
 
    /* gl_FragCoord.w: Already set up in emit_interpolation */