src/mesa/main/get_hash_generator.py

   1 #!/usr/bin/python2
   2 # coding=utf-8
   3 # -*- Mode: Python; py-indent-offset: 4 -*-
   4 #
   5 # Copyright © 2012 Intel Corporation
   6 #
   7 # Based on code by Kristian Høgsberg <krh@bitplanet.net>,
   8 #   extracted from mesa/main/get.c
   9 #
  10 # Permission is hereby granted, free of charge, to any person obtaining a
  11 # copy of this software and associated documentation files (the "Software"),
  12 # to deal in the Software without restriction, including without limitation
  13 # on the rights to use, copy, modify, merge, publish, distribute, sub
  14 # license, and/or sell copies of the Software, and to permit persons to whom
  15 # the Software is furnished to do so, subject to the following conditions:
  16 #
  17 # The above copyright notice and this permission notice (including the next
  18 # paragraph) shall be included in all copies or substantial portions of the
  19 # Software.
  20 #
  21 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23 # FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  24 # IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  26 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  27 # IN THE SOFTWARE.
  28
  29 # Generate a C header file containing hash tables of glGet parameter
  30 # names for each GL API. The generated file is to be included by glGet.c
  31
  32 import os, sys, imp, getopt
  33 from collections import defaultdict
  34 import get_hash_params
  35
  36 cur_dir = os.path.dirname(sys.argv[0])
  37 param_desc_file = "%s/get_hash_params.py" % cur_dir
  38
  39 GLAPI = "%s/../../mapi/glapi/gen" % cur_dir
  40 sys.path.append(GLAPI)
  41 import gl_XML
  42
  43 prime_factor = 89
  44 prime_step = 281
  45 hash_table_size = 1024
  46
  47 gl_apis=set(["GL", "GL_CORE", "GLES", "GLES2"])
  48
  49 def print_header():
  50    print "typedef const unsigned short table_t[%d];\n" % (hash_table_size)
  51    print "static const int prime_factor = %d, prime_step = %d;\n" % \
  52           (prime_factor, prime_step)
  53
  54 def print_params(params):
  55    print "static struct value_desc values[] = {"
  56    for p in params:
  57       print "    { %s, %s }," % (p[0], p[1])
  58
  59    print "};\n"
  60
  61 def api_name(api):
  62    return "API_OPEN%s" % api
  63
  64 def table_name(api):
  65    return "table_" + api_name(api)
  66
  67 def print_table(api, table):
  68    print "static table_t %s = {" % (table_name(api))
  69
  70    row_size = 4
  71    for i in range(0, len(table), row_size):
  72       row = table[i : i + row_size]
  73       idx_val = ["[%4d] = %4d" % iv for iv in row]
  74       print " " * 4 + ", ".join(idx_val) + ","
  75
  76    print "};\n"
  77
  78 def print_tables(tables):
  79    for table in tables:
  80       print_table(table["apis"][0], table["indices"])
  81
  82    print "static table_t *table_set[] = {"
  83    for table in tables:
  84       tname = table_name(table["apis"][0])
  85       for api in table["apis"]:
  86          print "   [%s] = &%s," % (api_name(api), tname)
  87    print "};\n"
  88
  89    print "#define table(api) (*table_set[api])"
  90
  91 # Merge tables with matching parameter lists (i.e. GL and GL_CORE)
  92 def merge_tables(tables):
  93    merged_tables = []
  94    for api, indices in sorted(tables.items()):
  95       matching_table = filter(lambda mt:mt["indices"] == indices,
  96                               merged_tables)
  97       if matching_table:
  98          matching_table[0]["apis"].append(api)
  99       else:
 100          merged_tables.append({"apis": [api], "indices": indices})
 101
 102    return merged_tables
 103
 104 def add_to_hash_table(table, hash_val, value):
 105    while True:
 106       index = hash_val & (hash_table_size - 1)
 107       if index not in table:
 108          table[index] = value
 109          break
 110       hash_val += prime_step
 111
 112 def die(msg):
 113    sys.stderr.write("%s: %s\n" % (program, msg))
 114    exit(1)
 115
 116 program = os.path.basename(sys.argv[0])
 117
 118 def generate_hash_tables(enum_list, enabled_apis, param_descriptors):
 119    tables = defaultdict(lambda:{})
 120
 121    # the first entry should be invalid, so that get.c:find_value can use
 122    # its index for the 'enum not found' condition.
 123    params = [[0, ""]]
 124
 125    for param_block in param_descriptors:
 126       if set(["apis", "params"]) != set(param_block):
 127          die("missing fields (%s) in param descriptor file (%s)" %
 128                (", ".join(set(["apis", "params"]) - set(param_block)),
 129                 param_desc_file))
 130
 131       valid_apis = set(param_block["apis"])
 132       if valid_apis - gl_apis:
 133          die("unknown API(s) in param descriptor file (%s): %s\n" %
 134                (param_desc_file, ",".join(valid_apis - gl_apis)))
 135
 136       if not (valid_apis & enabled_apis):
 137          continue
 138
 139       valid_apis &= enabled_apis
 140
 141       for param in param_block["params"]:
 142          enum_name = param[0]
 143          enum_val = enum_list[enum_name].value
 144          hash_val = enum_val * prime_factor
 145
 146          for api in valid_apis:
 147             add_to_hash_table(tables[api], hash_val, len(params))
 148
 149          params.append(["GL_" + enum_name, param[1]])
 150
 151    sorted_tables={}
 152    for api, indices in tables.items():
 153       sorted_tables[api] = sorted(indices.items())
 154
 155    return params, merge_tables(sorted_tables)
 156
 157 def opt_to_apis(feature):
 158    _map = {"ES1": "GLES", "ES2": "GLES2", "GL": "GL"}
 159    if feature not in _map:
 160       return None
 161
 162    apis = set([_map[feature]])
 163    if "GL" in apis:
 164       apis.add("GL_CORE")
 165
 166    return apis
 167
 168 def show_usage():
 169    sys.stderr.write(
 170 """Usage: %s [OPTIONS]
 171   -f <file>          specify GL API XML file
 172   -a [GL|ES1|ES2]    specify APIs to generate hash tables for
 173 """ % (program))
 174    exit(1)
 175
 176 if __name__ == '__main__':
 177    try:
 178       (opts, args) = getopt.getopt(sys.argv[1:], "f:a:")
 179    except Exception,e:
 180       show_usage()
 181
 182    if len(args) != 0:
 183       show_usage()
 184
 185    enabled_apis = set([])
 186    api_desc_file = ""
 187
 188    for opt_name, opt_val in opts:
 189       if opt_name == "-f":
 190          api_desc_file = opt_val
 191       if opt_name == "-a":
 192          apis = opt_to_apis(opt_val.upper())
 193          if not apis:
 194             die("invalid API %s\n" % opt_val)
 195
 196          enabled_apis |= apis
 197
 198    if not api_desc_file:
 199       die("missing descriptor file (-f)\n")
 200
 201    if len(enabled_apis) == 0:
 202       die("need at least a single enabled API\n")
 203
 204    try:
 205       api_desc = gl_XML.parse_GL_API(api_desc_file)
 206    except Exception:
 207       die("couldn't parse API specification file %s\n" % api_desc_file)
 208
 209    (params, hash_tables) = generate_hash_tables(api_desc.enums_by_name,
 210                               enabled_apis, get_hash_params.descriptor)
 211
 212    print_header()
 213    print_params(params)
 214    print_tables(hash_tables)