Splits the command buffers into common commands...

command_buffer/service/cross/common_decoder.cc

+/*
+ * Copyright 2009, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "command_buffer/service/cross/common_decoder.h"
+#include "command_buffer/service/cross/cmd_buffer_engine.h"
+
+namespace o3d {
+namespace command_buffer {
+
+void* CommonDecoder::GetAddressAndCheckSize(unsigned int shm_id,
+                                            unsigned int offset,
+                                            unsigned int size) {
+  void* shm_addr = engine_->GetSharedMemoryAddress(shm_id);
+  if (!shm_addr) return NULL;
+  size_t shm_size = engine_->GetSharedMemorySize(shm_id);
+  unsigned int end = offset + size;
+  if (end > shm_size || end < offset) {
+    return NULL;
+  }
+  return static_cast<char *>(shm_addr) + offset;

[apatrick, 2009/10/28 16:44:01]

char -> int8

+}
+
+const char* CommonDecoder::GetCommonCommandName(
+    cmd::CommandId command_id) const {
+  return cmd::GetCommandName(command_id);
+}
+
+namespace {
+
+// A struct to hold info about each command.
+struct CommandInfo {
+  int arg_flags;  // How to handle the arguments for this command
+  int arg_count;  // How many arguments are expected for this command.
+};
+
+// A table of CommandInfo for all the commands.
+const CommandInfo g_command_info[] = {
+  #define COMMON_COMMAND_BUFFER_CMD_OP(name) {                           \
+    cmd::name::kArgFlags,                                                \
+    sizeof(cmd::name) / sizeof(CommandBufferEntry) - 1, },  /* NOLINT */ \
+
+  COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
+
+  #undef COMMON_COMMAND_BUFFER_CMD_OP
+};
+
+}  // anonymous namespace.
+
+// Decode command with its arguments, and call the corresponding method.
+// Note: args is a pointer to the command buffer. As such, it could be changed
+// by a (malicious) client at any time, so if validation has to happen, it
+// should operate on a copy of them.
+parse_error::ParseError CommonDecoder::DoCommonCommand(
+    unsigned int command,
+    unsigned int arg_count,
+    const void* cmd_data) {
+  if (command < arraysize(g_command_info)) {
+    const CommandInfo& info = g_command_info[command];
+    unsigned int info_arg_count = static_cast<unsigned int>(info.arg_count);
+    if ((info.arg_flags == cmd::kFixed && arg_count == info_arg_count) ||
+        (info.arg_flags == cmd::kAtLeastN && arg_count >= info_arg_count)) {
+      switch (command) {
+        #define COMMON_COMMAND_BUFFER_CMD_OP(name)                      \
+          case cmd::name::kCmdId:                                       \
+            return Handle ## name(                                      \
+                arg_count,                                              \
+                *static_cast<const cmd::name*>(cmd_data));              \
+
+        COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
+
+        #undef COMMON_COMMAND_BUFFER_CMD_OP
+      }
+    } else {
+      return parse_error::kParseInvalidArguments;
+    }
+  }
+  return DoCommonCommand(command, arg_count, cmd_data);
+  return parse_error::kParseUnknownCommand;
+}
+
+parse_error::ParseError CommonDecoder::HandleNoop(
+    uint32 arg_count,
+    const cmd::Noop& args) {
+  return parse_error::kParseNoError;
+}
+
+parse_error::ParseError CommonDecoder::HandleSetToken(
+    uint32 arg_count,
+    const cmd::SetToken& args) {
+  engine_->set_token(args.token);
+  return parse_error::kParseNoError;
+}
+
+}  // namespace command_buffer
+}  // namespace o3d
+
+
+