gallium: added new tgsi_scan.c / tgsi_scan_shader() function

Used to get information about registers, instructions used in a shader.

1 files changed, 117 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/tgsi/util/tgsi_scan.c b/src/gallium/auxiliary/tgsi/util/tgsi_scan.c
new file mode 100644
index 00000000000..4b99ac37cce
--- /dev/null
+++ b/src/gallium/auxiliary/tgsi/util/tgsi_scan.c
@@ -0,0 +1,117 @@
+/**************************************************************************
+ * 
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+/**
+ * TGSI program scan utility.
+ * Used to determine which registers and instructions are used by a shader.
+ *
+ * Authors:  Brian Paul
+ */
+
+
+#include "tgsi_scan.h"
+#include "tgsi/util/tgsi_parse.h"
+#include "tgsi/util/tgsi_build.h"
+
+
+
+
+/**
+ */
+void
+tgsi_scan_shader(const struct tgsi_token *tokens,
+                 struct tgsi_shader_info *info)
+{
+   uint procType;
+   struct tgsi_parse_context parse;
+
+   memset(info, 0, sizeof(*info));
+
+   /**
+    ** Setup to begin parsing input shader
+    **/
+   if (tgsi_parse_init( &parse, tokens ) != TGSI_PARSE_OK) {
+      debug_printf("tgsi_parse_init() failed in tgsi_scan_shader()!\n");
+      return;
+   }
+   procType = parse.FullHeader.Processor.Processor;
+   assert(procType == TGSI_PROCESSOR_FRAGMENT ||
+          procType == TGSI_PROCESSOR_VERTEX ||
+          procType == TGSI_PROCESSOR_GEOMETRY);
+
+
+   /**
+    ** Loop over incoming program tokens/instructions
+    */
+   while( !tgsi_parse_end_of_tokens( &parse ) ) {
+
+      tgsi_parse_token( &parse );
+
+      switch( parse.FullToken.Token.Type ) {
+      case TGSI_TOKEN_TYPE_INSTRUCTION:
+         {
+            struct tgsi_full_instruction *fullinst
+               = &parse.FullToken.FullInstruction;
+
+            assert(fullinst->Instruction.Opcode < TGSI_OPCODE_LAST);
+            info->opcode_count[fullinst->Instruction.Opcode]++;
+         }
+         break;
+
+      case TGSI_TOKEN_TYPE_DECLARATION:
+         {
+            struct tgsi_full_declaration *fulldecl
+               = &parse.FullToken.FullDeclaration;
+            uint file = fulldecl->Declaration.File;
+            uint i;
+            for (i = fulldecl->u.DeclarationRange.First;
+                 i <= fulldecl->u.DeclarationRange.Last;
+                 i++) {
+               info->file_mask[file] |= (1 << i);
+               info->file_count[file]++;
+
+               /* special case */
+               if (procType == TGSI_PROCESSOR_FRAGMENT &&
+                   file == TGSI_FILE_OUTPUT &&
+                   fulldecl->Semantic.SemanticName == TGSI_SEMANTIC_POSITION) {
+                  info->writes_z = TRUE;
+               }
+            }
+         }
+         break;
+
+      case TGSI_TOKEN_TYPE_IMMEDIATE:
+         info->immediate_count++;
+         break;
+
+      default:
+         assert( 0 );
+      }
+   }
+
+   tgsi_parse_free (&parse);
+}