Mesa (master): draw: fix fog coord export.

[Dave Airlie]

Module: Mesa
Branch: master
Commit: fa2a76a21c8c513de506f2c5ec938c829cc65fdf
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=fa2a76a21c8c513de506f2c5ec938c829cc65fdf

Author: Dave Airlie <airlied at redhat.com>
Date:   Sat Jan 28 18:29:18 2012 +0000

draw: fix fog coord export.

This does what we do in the hw drivers, and only export the X.

fixes the fogcoord.dp* tests.

Signed-off-by: Dave Airlie <airlied at redhat.com>

---

 src/gallium/auxiliary/draw/draw_vs_exec.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/src/gallium/auxiliary/draw/draw_vs_exec.c b/src/gallium/auxiliary/draw/draw_vs_exec.c
index eaba475..84ce8c1 100644
--- a/src/gallium/auxiliary/draw/draw_vs_exec.c
+++ b/src/gallium/auxiliary/draw/draw_vs_exec.c
@@ -168,7 +168,12 @@ vs_exec_run_linear( struct draw_vertex_shader *shader,
                output[slot][2] = CLAMP(machine->Outputs[slot].xyzw[2].f[j], 0.0f, 1.0f);
                output[slot][3] = CLAMP(machine->Outputs[slot].xyzw[3].f[j], 0.0f, 1.0f);
             }
-            else
+            else if (name == TGSI_SEMANTIC_FOG) {
+               output[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
+               output[slot][1] = 0;
+               output[slot][2] = 0;
+               output[slot][3] = 1;
+	    } else
             {
                output[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
                output[slot][1] = machine->Outputs[slot].xyzw[1].f[j];