softpipe: draw_find_shader_output returns -1 on invalid outputs

It was changed from 0 to allow shader outputs at 0 that are
different from position.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

diff --git a/src/gallium/drivers/softpipe/sp_state_derived.c b/src/gallium/drivers/softpipe/sp_state_derived.c
index 93cd38e..6115349 100644 (file)
--- a/src/gallium/drivers/softpipe/sp_state_derived.c
+++ b/src/gallium/drivers/softpipe/sp_state_derived.c
@@ -127,7 +127,7 @@ softpipe_get_vertex_info(struct softpipe_context *softpipe)
          src = draw_find_shader_output(softpipe->draw,
                                        fsInfo->input_semantic_name[i],
                                        fsInfo->input_semantic_index[i]);
-        if (fsInfo->input_semantic_name[i] == TGSI_SEMANTIC_COLOR && src == 0)
+        if (fsInfo->input_semantic_name[i] == TGSI_SEMANTIC_COLOR && src == -1)
           /* try and find a bcolor */
           src = draw_find_shader_output(softpipe->draw,
                                         TGSI_SEMANTIC_BCOLOR, fsInfo->input_semantic_index[i]);