1 files changed, 235 insertions, 0 deletions
diff --git a/mesalib/src/mesa/main/get_hash_generator.py b/mesalib/src/mesa/main/get_hash_generator.py
new file mode 100644
index 000000000..4b3f5f490
--- /dev/null
+++ b/mesalib/src/mesa/main/get_hash_generator.py
@@ -0,0 +1,235 @@
+#!/usr/bin/python2
+# coding=utf-8
+# -*- Mode: Python; py-indent-offset: 4 -*-
+#
+# Copyright © 2012 Intel Corporation
+#
+# Based on code by Kristian Høgsberg <krh@bitplanet.net>,
+#   extracted from mesa/main/get.c
+#
+# 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
+# on 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
+# IBM 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.
+
+# Generate a C header file containing hash tables of glGet parameter
+# names for each GL API. The generated file is to be included by glGet.c
+
+import os, sys, imp, getopt
+from collections import defaultdict
+import get_hash_params
+
+cur_dir = os.path.dirname(sys.argv[0])
+param_desc_file = "%s/get_hash_params.py" % cur_dir
+
+GLAPI = "%s/../../mapi/glapi/gen" % cur_dir
+sys.path.append(GLAPI)
+import gl_XML
+
+prime_factor = 89
+prime_step = 281
+hash_table_size = 1024
+
+gl_apis=set(["GL", "GL_CORE", "GLES", "GLES2"])
+
+def print_header():
+   print "typedef const unsigned short table_t[%d];\n" % (hash_table_size)
+   print "static const int prime_factor = %d, prime_step = %d;\n" % \
+          (prime_factor, prime_step)
+
+def print_params(params):
+   print "static struct value_desc values[] = {"
+   for p in params:
+      print "    { %s, %s }," % (p[0], p[1])
+
+   print "};\n"
+
+def api_name(api):
+   return "API_OPEN%s" % api
+
+# This must match gl_api enum in src/mesa/main/mtypes.h
+api_enum = [
+   'GL',
+   'GLES',
+   'GLES2',
+   'GL_CORE',
+]
+
+def api_index(api):
+    return api_enum.index(api)
+
+def table_name(api):
+   return "table_" + api_name(api)
+
+def print_table(api, table):
+   print "static table_t %s = {" % (table_name(api))
+
+   # convert sparse (index, value) table into a dense table
+   dense_table = [0] * hash_table_size
+   for i, v in table:
+      dense_table[i] = v
+
+   row_size = 4
+   for i in range(0, hash_table_size, row_size):
+      row = dense_table[i : i + row_size]
+      idx_val = ["%4d" % v for v in row]
+      print " " * 4 + ", ".join(idx_val) + ","
+
+   print "};\n"
+
+def print_tables(tables):
+   for table in tables:
+      print_table(table["apis"][0], table["indices"])
+
+   dense_tables = ['NULL'] * len(api_enum)
+   for table in tables:
+      tname = table_name(table["apis"][0])
+      for api in table["apis"]:
+         i = api_index(api)
+         dense_tables[i] = "&%s" % (tname)
+
+   print "static table_t *table_set[] = {"
+   for expr in dense_tables:
+      print "   %s," % expr
+   print "};\n"
+
+   print "#define table(api) (*table_set[api])"
+
+# Merge tables with matching parameter lists (i.e. GL and GL_CORE)
+def merge_tables(tables):
+   merged_tables = []
+   for api, indices in sorted(tables.items()):
+      matching_table = filter(lambda mt:mt["indices"] == indices,
+                              merged_tables)
+      if matching_table:
+         matching_table[0]["apis"].append(api)
+      else:
+         merged_tables.append({"apis": [api], "indices": indices})
+
+   return merged_tables
+
+def add_to_hash_table(table, hash_val, value):
+   while True:
+      index = hash_val & (hash_table_size - 1)
+      if index not in table:
+         table[index] = value
+         break
+      hash_val += prime_step
+
+def die(msg):
+   sys.stderr.write("%s: %s\n" % (program, msg))
+   exit(1)
+
+program = os.path.basename(sys.argv[0])
+
+def generate_hash_tables(enum_list, enabled_apis, param_descriptors):
+   tables = defaultdict(lambda:{})
+
+   # the first entry should be invalid, so that get.c:find_value can use
+   # its index for the 'enum not found' condition.
+   params = [[0, ""]]
+
+   for param_block in param_descriptors:
+      if set(["apis", "params"]) != set(param_block):
+         die("missing fields (%s) in param descriptor file (%s)" %
+               (", ".join(set(["apis", "params"]) - set(param_block)),
+                param_desc_file))
+
+      valid_apis = set(param_block["apis"])
+      if valid_apis - gl_apis:
+         die("unknown API(s) in param descriptor file (%s): %s\n" %
+               (param_desc_file, ",".join(valid_apis - gl_apis)))
+
+      if not (valid_apis & enabled_apis):
+         continue
+
+      valid_apis &= enabled_apis
+
+      for param in param_block["params"]:
+         enum_name = param[0]
+         enum_val = enum_list[enum_name].value
+         hash_val = enum_val * prime_factor
+
+         for api in valid_apis:
+            add_to_hash_table(tables[api], hash_val, len(params))
+
+         params.append(["GL_" + enum_name, param[1]])
+
+   sorted_tables={}
+   for api, indices in tables.items():
+      sorted_tables[api] = sorted(indices.items())
+
+   return params, merge_tables(sorted_tables)
+
+def opt_to_apis(feature):
+   _map = {"ES1": "GLES", "ES2": "GLES2", "GL": "GL"}
+   if feature not in _map:
+      return None
+
+   apis = set([_map[feature]])
+   if "GL" in apis:
+      apis.add("GL_CORE")
+
+   return apis
+
+def show_usage():
+   sys.stderr.write(
+"""Usage: %s [OPTIONS]
+  -f <file>          specify GL API XML file
+  -a [GL|ES1|ES2]    specify APIs to generate hash tables for
+""" % (program))
+   exit(1)
+
+if __name__ == '__main__':
+   try:
+      (opts, args) = getopt.getopt(sys.argv[1:], "f:a:")
+   except Exception,e:
+      show_usage()
+
+   if len(args) != 0:
+      show_usage()
+
+   enabled_apis = set([])
+   api_desc_file = ""
+
+   for opt_name, opt_val in opts:
+      if opt_name == "-f":
+         api_desc_file = opt_val
+      if opt_name == "-a":
+         apis = opt_to_apis(opt_val.upper())
+         if not apis:
+            die("invalid API %s\n" % opt_val)
+
+         enabled_apis |= apis
+
+   if not api_desc_file:
+      die("missing descriptor file (-f)\n")
+
+   if len(enabled_apis) == 0:
+      die("need at least a single enabled API\n")
+
+   try:
+      api_desc = gl_XML.parse_GL_API(api_desc_file)
+   except Exception:
+      die("couldn't parse API specification file %s\n" % api_desc_file)
+
+   (params, hash_tables) = generate_hash_tables(api_desc.enums_by_name,
+                              enabled_apis, get_hash_params.descriptor)
+
+   print_header()
+   print_params(params)
+   print_tables(hash_tables)