gpu: Autogenerate glHint state

gpu/command_buffer/build_gles2_cmd_buffer.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """code generator for GLES2 command buffers."""
 
 import itertools
 import os
 import os.path
@@ skipping 324 matching lines @@
         'default': '0',
       },
       {
         'name': 'stencil_back_mask',
         'type': 'GLuint',
         'enum': 'GL_STENCIL_BACK_VALUE_MASK',
         'default': '0xFFFFFFFFU',
       },
     ],
   },
+  'Hint': {
+    'type': 'NamedParameter',
+    'func': 'Hint',
+    'states': [
+      {
+        'name': 'hint_generate_mipmap',
+        'type': 'GLenum',
+        'enum': 'GL_GENERATE_MIPMAP_HINT',
+        'default': 'GL_DONT_CARE'
+      },
+      {
+        'name': 'hint_fragment_shader_derivative',
+        'type': 'GLenum',
+        'enum': 'GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES',
+        'default': 'GL_DONT_CARE',
+        'extension_flag': 'oes_standard_derivatives'
+      }
+    ],
+  },
   # TODO: Consider implemenenting these states
-  # GL_GENERATE_MIPMAP_HINT
   # GL_ACTIVE_TEXTURE,
   # GL_PACK_ALIGNMENT,
   # GL_UNPACK_ALIGNMENT
   'LineWidth': {
     'type': 'Normal',
     'func': 'LineWidth',
     'enum': 'GL_LINE_WIDTH',
     'states': [
       {
         'name': 'line_width',
@@ skipping 1025 matching lines @@
       '1': 'GL_INCR'
     },
   },
   'StencilOpSeparate': {
     'type': 'StateSetFrontBackSeparate',
     'state': 'StencilOp',
     'valid_args': {
       '1': 'GL_INCR'
     },
   },
-  'Hint': {'decoder_func': 'DoHint'},
+  'Hint': {
+    'type': 'StateSetNamedParameter',
+    'state': 'Hint',
+  },
   'CullFace': {'type': 'StateSet', 'state': 'CullFace'},
   'FrontFace': {'type': 'StateSet', 'state': 'FrontFace'},
   'DepthFunc': {'type': 'StateSet', 'state': 'DepthFunc'},
   'LineWidth': {
     'type': 'StateSet',
     'state': 'LineWidth',
     'valid_args': {
       '0': '0.5f'
     },
   },
@@ skipping 1868 matching lines @@
       for ndx, item in enumerate(group):
         file.Write("    state_.%s = %s;\n" % (item['name'], args[ndx].name))
     if 'state_flag' in state:
       file.Write("    %s = true;\n" % state['state_flag'])
     if not func.GetInfo("no_gl"):
       file.Write("    %s(%s);\n" %
                  (func.GetGLFunctionName(), func.MakeOriginalArgString("")))
     file.Write("  }\n")
 
 
+class StateSetNamedParameter(TypeHandler):
+  """Handler for commands that set a state chosen with an enum parameter."""
+
+  def __init__(self):
+    TypeHandler.__init__(self)
+
+  def WriteHandlerImplementation(self, func, file):
+    """Overriden from TypeHandler."""
+    state_name = func.GetInfo('state')
+    state = _STATES[state_name]
+    states = state['states']
+    args = func.GetOriginalArgs()
+    num_args = len(args)
+    assert num_args == 2
+    for state in states:
+      file.Write("  " if state is states[0] else "  } else ")
+      file.Write("if (%s == %s &&\n      state_.%s != %s) {\n" %
+                 (args[0].name, state['enum'], state['name'], args[1].name))
+      file.Write("    state_.%s = %s;\n" %
+                 (state['name'], args[1].name))
+      if not func.GetInfo("no_gl"):
+        file.Write("    %s(%s);\n" %
+                   (func.GetGLFunctionName(), func.MakeOriginalArgString("")))
+    file.Write("  }\n")
+
+
 class CustomHandler(TypeHandler):
   """Handler for commands that are auto-generated but require minor tweaks."""
 
   def __init__(self):
     TypeHandler.__init__(self)
 
   def WriteServiceImplementation(self, func, file):
     """Overrriden from TypeHandler."""
     pass
 
@@ skipping 3441 matching lines @@
       'HandWritten': HandWrittenHandler(),
       'Is': IsHandler(),
       'Manual': ManualHandler(),
       'PUT': PUTHandler(),
       'PUTn': PUTnHandler(),
       'PUTXn': PUTXnHandler(),
       'StateSet': StateSetHandler(),
       'StateSetRGBAlpha': StateSetRGBAlphaHandler(),
       'StateSetFrontBack': StateSetFrontBackHandler(),
       'StateSetFrontBackSeparate': StateSetFrontBackSeparateHandler(),
+      'StateSetNamedParameter': StateSetNamedParameter(),
       'STRn': STRnHandler(),
       'Todo': TodoHandler(),
     }
 
     for func_name in _FUNCTION_INFO:
       info = _FUNCTION_INFO[func_name]
       type = ''
       if 'type' in info:
         type = info['type']
       self._function_info[func_name] = FunctionInfo(info,
@@ skipping 299 matching lines @@
       state = _STATES[state_name]
       if state['type'] == 'FrontBack':
         num_states = len(state['states'])
         for ndx, group in enumerate(Grouper(num_states / 2, state['states'])):
           args = []
           for item in group:
             args.append('%s' % item['name'])
           file.Write(
               "  gl%s(%s, %s);\n" %
               (state['func'], ('GL_FRONT', 'GL_BACK')[ndx], ", ".join(args)))
+      elif state['type'] == 'NamedParameter':
+        for item in state['states']:
+          if 'extension_flag' in item:
+            file.Write("  if (feature_info_->feature_flags().%s)\n  " %
+                       item['extension_flag'])
+          file.Write("  gl%s(%s, %s);\n" %
+                     (state['func'], item['enum'], item['name']))
       else:
         args = []
         for item in state['states']:
           args.append('%s' % item['name'])
         file.Write("  gl%s(%s);\n" % (state['func'], ", ".join(args)))
     file.Write("}\n")
 
     file.Write("""bool ContextState::GetEnabled(GLenum cap) const {
   switch (cap) {
 """)
@@ skipping 147 matching lines @@
           for item in group:
             if 'expected' in item:
               args.append(item['expected'])
             else:
               args.append(item['default'])
           file.Write(
               "  EXPECT_CALL(*gl_, %s(%s, %s))\n" %
               (state['func'], ('GL_FRONT', 'GL_BACK')[ndx], ", ".join(args)))
           file.Write("      .Times(1)\n")
           file.Write("      .RetiresOnSaturation();\n")
+      elif state['type'] == 'NamedParameter':
+        for item in state['states']:
+          if 'extension_flag' in item:
+            continue
+          file.Write(
+              "  EXPECT_CALL(*gl_, %s(%s, %s))\n" %
+              (state['func'], item['enum'], item['default']))
+          file.Write("      .Times(1)\n")
+          file.Write("      .RetiresOnSaturation();\n")
       else:
         args = []
         for item in state['states']:
           if 'expected' in item:
             args.append(item['expected'])
           else:
             args.append(item['default'])
         file.Write("  EXPECT_CALL(*gl_, %s(%s))\n" %
                    (state['func'], ", ".join(args)))
         file.Write("      .Times(1)\n")
@@ skipping 393 matching lines @@
 
   (options, args) = parser.parse_args(args=argv)
 
   # Add in states and capabilites to GLState
   for state_name in sorted(_STATES.keys()):
     state = _STATES[state_name]
     if 'enum' in state:
       _ENUM_LISTS['GLState']['valid'].append(state['enum'])
     else:
       for item in state['states']:
+        if 'extension_flag' in item:
+          continue
         _ENUM_LISTS['GLState']['valid'].append(item['enum'])
   for capability in _CAPABILITY_FLAGS:
     _ENUM_LISTS['GLState']['valid'].append("GL_%s" % capability['name'].upper())
 
   # This script lives under gpu/command_buffer, cd to base directory.
   os.chdir(os.path.dirname(__file__) + "/../..")
 
   gen = GLGenerator(options.verbose)
   gen.ParseGLH("common/GLES2/gl2.h")
 
@@ skipping 47 matching lines @@
     gen.WriteGLES2Header("../GLES2/gl2chromium_autogen.h")
 
   if gen.errors > 0:
     print "%d errors" % gen.errors
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))