From 8485811f10142f54756d876ebe91193bfc8f8a0e Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Wed, 6 Jan 2010 17:42:53 -0700
Subject: tnl: set FOGC result to (f,0,0,1)

Fixed FDO bug 23397.
---
 src/mesa/tnl/t_vb_program.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src')

diff --git a/src/mesa/tnl/t_vb_program.c b/src/mesa/tnl/t_vb_program.c
index e69f7d5766..a9dae7d2e7 100644
--- a/src/mesa/tnl/t_vb_program.c
+++ b/src/mesa/tnl/t_vb_program.c
@@ -390,6 +390,13 @@ run_vp( GLcontext *ctx, struct tnl_pipeline_stage *stage )
 #endif
          COPY_4V(store->results[attr].data[i], machine.Outputs[attr]);
       }
+
+      /* FOGC is a special case.  Fragment shader expects (f,0,0,1) */
+      if (program->Base.OutputsWritten & BITFIELD64_BIT(VERT_RESULT_FOGC)) {
+         store->results[VERT_RESULT_FOGC].data[i][1] = 0.0;
+         store->results[VERT_RESULT_FOGC].data[i][2] = 0.0;
+         store->results[VERT_RESULT_FOGC].data[i][3] = 1.0;
+      }
 #ifdef NAN_CHECK
       ASSERT(machine.Outputs[0][3] != 0.0F);
 #endif
-- 
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