Mesa (master): tgsi: add prolog() method to tgsi_transform_context

[Brian Paul]

Module: Mesa
Branch: master
Commit: b16bb3f50f0d71f7e720c4feefcb86e15090d52f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b16bb3f50f0d71f7e720c4feefcb86e15090d52f

Author: Brian Paul <brianp at vmware.com>
Date:   Fri Mar 14 14:49:33 2014 -0600

tgsi: add prolog() method to tgsi_transform_context

Called when the user can insert new decls, instructions.
This could be used in a few places in the 'draw' module.

Reviewed-by: Charmaine Lee <charmainel at vmware.com>

---

 src/gallium/auxiliary/tgsi/tgsi_transform.c |    7 +++++++
 src/gallium/auxiliary/tgsi/tgsi_transform.h |    6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_transform.c b/src/gallium/auxiliary/tgsi/tgsi_transform.c
index b16d296..93e5b98 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_transform.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_transform.c
@@ -109,6 +109,7 @@ tgsi_transform_shader(const struct tgsi_token *tokens_in,
                       struct tgsi_transform_context *ctx)
 {
    uint procType;
+   boolean first_instruction = TRUE;
 
    /* input shader */
    struct tgsi_parse_context parse;
@@ -166,10 +167,16 @@ tgsi_transform_shader(const struct tgsi_token *tokens_in,
             struct tgsi_full_instruction *fullinst
                = &parse.FullToken.FullInstruction;
 
+            if (first_instruction && ctx->prolog) {
+               ctx->prolog(ctx);
+            }
+
             if (ctx->transform_instruction)
                ctx->transform_instruction(ctx, fullinst);
             else
                ctx->emit_instruction(ctx, fullinst);
+
+            first_instruction = FALSE;
          }
          break;
 
diff --git a/src/gallium/auxiliary/tgsi/tgsi_transform.h b/src/gallium/auxiliary/tgsi/tgsi_transform.h
index 8b96664..5ec0719 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_transform.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_transform.h
@@ -57,6 +57,12 @@ struct tgsi_transform_context
                               struct tgsi_full_property *prop);
 
    /**
+    * Called after last declaration, before first instruction.  This is
+    * where the user might insert new declarations and/or instructions.
+    */
+   void (*prolog)(struct tgsi_transform_context *ctx);
+
+   /**
     * Called at end of input program to allow caller to append extra
     * instructions.  Return number of tokens emitted.
     */