mesa: when emitting vertex program fog, set yzw=0,0,1

Fixes piglit fp-fog failure with gallium.

diff --git a/src/mesa/main/ffvertex_prog.c b/src/mesa/main/ffvertex_prog.c
index 80dde4b5aa2338a93a79d3db5ddd4625f3266d7e..8e21a27f897c08ff1c4ee5f0ea3b7e748149d40b 100644 (file)
--- a/src/mesa/main/ffvertex_prog.c
+++ b/src/mesa/main/ffvertex_prog.c
@@ -1306,7 +1306,9 @@ static void build_fog( struct tnl_program *p )
       input = swizzle1(register_input(p, VERT_ATTRIB_FOG), X);
    }
 
+   /* result.fog = {abs(f),0,0,1}; */
    emit_op1(p, OPCODE_ABS, fog, WRITEMASK_X, input);
+   emit_op1(p, OPCODE_MOV, fog, WRITEMASK_YZW, get_identity_param(p));
 }