gpu: Defer reads from default framebuffer when needed.

gpu/command_buffer/build_gles2_cmd_buffer.py

Index: gpu/command_buffer/build_gles2_cmd_buffer.py
diff --git a/gpu/command_buffer/build_gles2_cmd_buffer.py b/gpu/command_buffer/build_gles2_cmd_buffer.py
index 32e53f43365270c94108506e6f6f4d6e3e135479..2941a0e9bcc3ee7ae04c1b937b7d12eadfcad389 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -1180,7 +1180,7 @@ _FUNCTION_INFO = {
     'client_test': False,
   },
   'BlitFramebufferEXT': {
-    'decoder_func': 'DoBlitFramebufferEXT',
+    'type': 'ManualService',
     'unit_test': False,
     'extension': True,
     'pepper_interface': 'FramebufferBlit',

[greggman, 2012/11/30 02:49:01]

Would be better to add add a couple of flags here?

'defer_draw': True,
'defer_read': True,

And adjust the generation code?

[piman, 2012/11/30 04:52:34]

Done.

@@ -1203,8 +1203,7 @@ _FUNCTION_INFO = {
     'result': ['GLenum'],
   },
   'Clear': {
-    'type': 'Manual',
-    'cmd_args': 'GLbitfield mask'
+    'type': 'ManualService',
   },
   'ClearColor': {
     'type': 'StateSet',
@@ -1261,11 +1260,11 @@ _FUNCTION_INFO = {
     'decoder_func': 'DoCompressedTexSubImage2D',
   },
   'CopyTexImage2D': {
-    'decoder_func': 'DoCopyTexImage2D',
+    'type': 'ManualService',
     'unit_test': False,
   },
   'CopyTexSubImage2D': {
-    'decoder_func': 'DoCopyTexSubImage2D',
+    'type': 'ManualService',
   },
   'CreateProgram': {
     'type': 'Create',
@@ -3246,6 +3245,25 @@ class ManualHandler(CustomHandler):
       CustomHandler.WriteImmediateCmdGetTotalSize(self, func, file)
 
 
+class ManualServiceHandler(TypeHandler):
+  """Handler for commands that are auto-generated but for the service side."""
+
+  def __init__(self):
+    TypeHandler.__init__(self)
+
+  def WriteServiceImplementation(self, func, file):
+    """Overrriden from TypeHandler."""
+    pass
+
+  def WriteImmediateServiceImplementation(self, func, file):
+    """Overrriden from TypeHandler."""
+    pass
+
+  def WriteBucketServiceImplementation(self, func, file):
+    """Overrriden from TypeHandler."""
+    pass
+
+
 class DataHandler(TypeHandler):
   """Handler for glBufferData, glBufferSubData, glTexImage2D, glTexSubImage2D,
      glCompressedTexImage2D, glCompressedTexImageSub2D."""
@@ -6414,6 +6432,7 @@ class GLGenerator(object):
       'HandWritten': HandWrittenHandler(),
       'Is': IsHandler(),
       'Manual': ManualHandler(),
+      'ManualService': ManualServiceHandler(),
       'PUT': PUTHandler(),
       'PUTn': PUTnHandler(),
       'PUTXn': PUTXnHandler(),