From dfab375c07545a9068a9b25efee746efd275bf89 Mon Sep 17 00:00:00 2001
From: Michal Krol <michal@vmware.com>
Date: Fri, 3 Apr 2009 17:06:36 +0200
Subject: [PATCH] tgsi/text: Allow optional component selection for indirect
 registers.

---
 src/gallium/auxiliary/tgsi/tgsi_text.c | 43 +++++++++++++++++++++++---
 1 file changed, 38 insertions(+), 5 deletions(-)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_text.c b/src/gallium/auxiliary/tgsi/tgsi_text.c
index bb1c7dc6ccf..a40fcab2126 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_text.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_text.c
@@ -358,9 +358,9 @@ parse_register_dst(
 
 /* Parse source register operand.
  *    <register_src> ::= <register_file_bracket_index> `]' |
- *                       <register_file_bracket> <register_dst> `]' |
- *                       <register_file_bracket> <register_dst> `+' <uint> `]' |
- *                       <register_file_bracket> <register_dst> `-' <uint> `]'
+ *                       <register_file_bracket> <register_dst> [`.' (`x' | `y' | `z' | `w')] `]' |
+ *                       <register_file_bracket> <register_dst> [`.' (`x' | `y' | `z' | `w')] `+' <uint> `]' |
+ *                       <register_file_bracket> <register_dst> [`.' (`x' | `y' | `z' | `w')] `-' <uint> `]'
  */
 static boolean
 parse_register_src(
@@ -368,11 +368,13 @@ parse_register_src(
    uint *file,
    int *index,
    uint *ind_file,
-   int *ind_index )
+   int *ind_index,
+   uint *ind_comp)
 {
    const char *cur;
    uint uindex;
 
+   *ind_comp = TGSI_SWIZZLE_X;
    if (!parse_register_file_bracket( ctx, file ))
       return FALSE;
    eat_opt_white( &ctx->cur );
@@ -381,6 +383,32 @@ parse_register_src(
       if (!parse_register_dst( ctx, ind_file, ind_index ))
          return FALSE;
       eat_opt_white( &ctx->cur );
+
+      if (*ctx->cur == '.') {
+         ctx->cur++;
+         eat_opt_white(&ctx->cur);
+
+         switch (uprcase(*ctx->cur)) {
+         case 'X':
+            *ind_comp = TGSI_SWIZZLE_X;
+            break;
+         case 'Y':
+            *ind_comp = TGSI_SWIZZLE_Y;
+            break;
+         case 'Z':
+            *ind_comp = TGSI_SWIZZLE_Z;
+            break;
+         case 'W':
+            *ind_comp = TGSI_SWIZZLE_W;
+            break;
+         default:
+            report_error(ctx, "Expected indirect register swizzle component `x', `y', `z' or `w'");
+            return FALSE;
+         }
+         ctx->cur++;
+         eat_opt_white(&ctx->cur);
+      }
+
       if (*ctx->cur == '+' || *ctx->cur == '-') {
          boolean negate;
 
@@ -561,6 +589,7 @@ parse_src_operand(
    int index;
    uint ind_file;
    int ind_index;
+   uint ind_comp;
    uint swizzle[4];
    boolean parsed_ext_negate_paren = FALSE;
    boolean parsed_swizzle;
@@ -643,7 +672,7 @@ parse_src_operand(
       }
    }
 
-   if (!parse_register_src( ctx, &file, &index, &ind_file, &ind_index ))
+   if (!parse_register_src(ctx, &file, &index, &ind_file, &ind_index, &ind_comp))
       return FALSE;
    src->SrcRegister.File = file;
    src->SrcRegister.Index = index;
@@ -651,6 +680,10 @@ parse_src_operand(
       src->SrcRegister.Indirect = 1;
       src->SrcRegisterInd.File = ind_file;
       src->SrcRegisterInd.Index = ind_index;
+      src->SrcRegisterInd.SwizzleX = ind_comp;
+      src->SrcRegisterInd.SwizzleY = ind_comp;
+      src->SrcRegisterInd.SwizzleZ = ind_comp;
+      src->SrcRegisterInd.SwizzleW = ind_comp;
    }
 
    /* Parse optional swizzle.
-- 
2.30.2