tgsi: Drop uses_fogcoord and uses_frontfacing from tgsi_scan.

It was not used anywhere; the code was buggy (it didn't take care of
indirect registers and could potential cause buffer underflows) and the
same effect can now be easily achieved by just by looking at
input_semantic_name[] and input_usage_mask[].

2 files changed, 0 insertions, 16 deletions

diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c b/src/gallium/auxiliary/tgsi/tgsi_scan.c
index 7ee272b9498..ced9c94f468 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
@@ -95,20 +95,6 @@ tgsi_scan_shader(const struct tgsi_token *tokens,
                   &fullinst->Src[i];
                int ind = src->Register.Index;
 
-               /* check if we read the frag shader FOG or FACE inputs */
-               if (procType == TGSI_PROCESSOR_FRAGMENT) {
-                  if (src->Register.File == TGSI_FILE_INPUT ||
-                      src->Register.File == TGSI_FILE_SYSTEM_VALUE) {
-                     assert(ind >= 0);
-                     if (info->input_semantic_name[ind] == TGSI_SEMANTIC_FOG) {
-                        info->uses_fogcoord = TRUE;
-                     }
-                     else if (info->input_semantic_name[ind] == TGSI_SEMANTIC_FACE) {
-                        info->uses_frontfacing = TRUE;
-                     }
-                  }
-               }
-
                /* Mark which inputs are effectively used */
                if (src->Register.File == TGSI_FILE_INPUT) {
                   unsigned usage_mask;
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.h b/src/gallium/auxiliary/tgsi/tgsi_scan.h
index f43541429d7..e75280336f0 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.h
@@ -62,8 +62,6 @@ struct tgsi_shader_info
    boolean writes_z;  /**< does fragment shader write Z value? */
    boolean writes_edgeflag; /**< vertex shader outputs edgeflag */
    boolean uses_kill;  /**< KIL or KILP instruction used? */
-   boolean uses_fogcoord; /**< fragment shader uses fog coord? */
-   boolean uses_frontfacing; /**< fragment shader uses front/back-face flag? */
 
    struct {
       unsigned name;