This is the O3D source tree's initial commit to the Chromium tree. It

is not built or referenced at all by the chrome build yet, and doesn't 
yet build in it's new home.  We'll change that shortly.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17035 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 211 insertions, 0 deletions

diff --git a/o3d/command_buffer/client/cross/effect_helper.cc b/o3d/command_buffer/client/cross/effect_helper.cc
new file mode 100644
index 0000000..0cab6ee
--- /dev/null
+++ b/o3d/command_buffer/client/cross/effect_helper.cc
@@ -0,0 +1,211 @@
+/*
+ * 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.
+ */
+
+
+// This file implements the EffectHelper class.
+
+#include "command_buffer/common/cross/cmd_buffer_format.h"
+#include "command_buffer/client/cross/cmd_buffer_helper.h"
+#include "command_buffer/client/cross/effect_helper.h"
+#include "command_buffer/client/cross/fenced_allocator.h"
+#include "command_buffer/client/cross/id_allocator.h"
+
+// TODO: write a unit test.
+
+namespace o3d {
+namespace command_buffer {
+
+bool EffectHelper::CreateEffectParameters(ResourceID effect_id,
+                                          std::vector<EffectParamDesc> *descs) {
+  using effect_param::Desc;
+  DCHECK_NE(effect_id, kInvalidResource);
+  DCHECK(descs);
+  descs->clear();
+
+  // Get the param count.
+  Uint32 *retval = shm_allocator_->AllocTyped<Uint32>(1);
+  CommandBufferEntry args[4];
+  args[0].value_uint32 = effect_id;
+  args[1].value_uint32 = sizeof(*retval);
+  args[2].value_uint32 = shm_id_;
+  args[3].value_uint32 = shm_allocator_->GetOffset(retval);
+  helper_->AddCommand(GET_PARAM_COUNT, 4, args);
+  // Finish has to be called to get the result.
+  helper_->Finish();
+
+  // We could have failed if the effect_id is invalid.
+  if (helper_->interface()->GetParseError() !=
+      BufferSyncInterface::PARSE_NO_ERROR) {
+    shm_allocator_->Free(retval);
+    return false;
+  }
+  unsigned int param_count = *retval;
+
+  shm_allocator_->Free(retval);
+  unsigned int max_buffer_size = shm_allocator_->GetLargestFreeOrPendingSize();
+  if (max_buffer_size < sizeof(Desc)) {  // NOLINT
+    // Not enough memory to get at least 1 param desc.
+    return false;
+  }
+  descs->resize(param_count);
+  for (unsigned int i = 0; i < param_count; ++i) {
+    EffectParamDesc *desc = &((*descs)[i]);
+    desc->id = param_id_allocator_->AllocateID();
+    args[0].value_uint32 = desc->id;
+    args[1].value_uint32 = effect_id;
+    args[2].value_uint32 = i;
+    helper_->AddCommand(CREATE_PARAM, 3, args);
+  }
+
+  // Read param descriptions in batches. We use as much shared memory as
+  // possible so that we only call Finish as little as possible.
+  unsigned int max_param_per_batch =
+      std::min(param_count, max_buffer_size / sizeof(Desc));  // NOLINT
+  Desc *raw_descs = shm_allocator_->AllocTyped<Desc>(max_param_per_batch);
+  DCHECK(raw_descs);
+  for (unsigned int i = 0; i < param_count; i += max_param_per_batch) {
+    unsigned int count = std::min(param_count - i, max_param_per_batch);
+    for (unsigned int j = 0 ; j < count; ++j) {
+      EffectParamDesc *desc = &((*descs)[i + j]);
+      Desc *raw_desc = raw_descs + j;
+      args[0].value_uint32 = desc->id;
+      args[1].value_uint32 = sizeof(*raw_desc);
+      args[2].value_uint32 = shm_id_;
+      args[3].value_uint32 = shm_allocator_->GetOffset(raw_desc);
+      helper_->AddCommand(GET_PARAM_DESC, 4, args);
+    }
+    // Finish to get the results.
+    helper_->Finish();
+    DCHECK_EQ(helper_->interface()->GetParseError(),
+              BufferSyncInterface::PARSE_NO_ERROR);
+    for (unsigned int j = 0 ; j < count; ++j) {
+      EffectParamDesc *desc = &((*descs)[i + j]);
+      Desc *raw_desc = raw_descs + j;
+      desc->data_type = raw_desc->data_type;
+      desc->data_size = raw_desc->data_size;
+      desc->cmd_desc_size = raw_desc->size;
+    }
+  }
+  shm_allocator_->Free(raw_descs);
+  return true;
+}
+
+bool EffectHelper::GetParamStrings(EffectParamDesc *desc) {
+  using effect_param::Desc;
+  DCHECK(desc);
+  DCHECK_NE(desc->id, kInvalidResource);
+  // desc may not have come directly from CreateEffectParameters, so it may be
+  // less than the minimum required size.
+  unsigned int size = std::max(desc->cmd_desc_size, sizeof(Desc));  // NOLINT
+  Desc *raw_desc = static_cast<Desc *>(shm_allocator_->Alloc(size));
+  if (!raw_desc) {
+    // Not enough memory to get the param desc.
+    return false;
+  }
+  CommandBufferEntry args[4];
+  args[0].value_uint32 = desc->id;
+  args[1].value_uint32 = size;
+  args[2].value_uint32 = shm_id_;
+  args[3].value_uint32 = shm_allocator_->GetOffset(raw_desc);
+  helper_->AddCommand(GET_PARAM_DESC, 4, args);
+  // Finish to get the results.
+  helper_->Finish();
+
+  // We could have failed if the param ID is invalid.
+  if (helper_->interface()->GetParseError() !=
+      BufferSyncInterface::PARSE_NO_ERROR) {
+    shm_allocator_->Free(raw_desc);
+    return false;
+  }
+
+  if (raw_desc->size > size) {
+    // We had not allocated enough memory the first time (e.g. if the
+    // EffectParamDesc didn't come from CreateEffectParameters, so the user had
+    // no way of knowing what size was needed for the strings), so re-allocate
+    // and try again.
+    size = raw_desc->size;
+    desc->cmd_desc_size = size;
+    shm_allocator_->Free(raw_desc);
+    raw_desc = static_cast<Desc *>(shm_allocator_->Alloc(size));
+    if (!raw_desc) {
+      // Not enough memory to get the param desc.
+      return false;
+    }
+    args[1].value_uint32 = size;
+    args[3].value_uint32 = shm_allocator_->GetOffset(raw_desc);
+    helper_->AddCommand(GET_PARAM_DESC, 4, args);
+    // Finish to get the results.
+    helper_->Finish();
+    DCHECK_EQ(helper_->interface()->GetParseError(),
+              BufferSyncInterface::PARSE_NO_ERROR);
+    DCHECK_EQ(raw_desc->size, size);
+  }
+
+  const char *raw_desc_string = reinterpret_cast<char *>(raw_desc);
+  if (raw_desc->name_offset) {
+    DCHECK_LE(raw_desc->name_offset + raw_desc->name_size, raw_desc->size);
+    DCHECK_GT(raw_desc->name_size, 0);
+    DCHECK_EQ(raw_desc_string[raw_desc->name_offset + raw_desc->name_size - 1],
+              0);
+    desc->name = String(raw_desc_string + raw_desc->name_offset,
+                        raw_desc->name_size - 1);
+  } else {
+    desc->name.clear();
+  }
+  if (raw_desc->semantic_offset) {
+    DCHECK_LE(raw_desc->semantic_offset + raw_desc->semantic_size,
+              raw_desc->size);
+    DCHECK_GT(raw_desc->semantic_size, 0);
+    DCHECK_EQ(raw_desc_string[raw_desc->semantic_offset +
+                              raw_desc->semantic_size - 1],
+              0);
+    desc->semantic = String(raw_desc_string + raw_desc->semantic_offset,
+                            raw_desc->semantic_size - 1);
+  } else {
+    desc->semantic.clear();
+  }
+  shm_allocator_->Free(raw_desc);
+  return true;
+}
+
+void EffectHelper::DestroyEffectParameters(
+    const std::vector<EffectParamDesc> &descs) {
+  CommandBufferEntry args[1];
+  for (unsigned int i = 0; i < descs.size(); ++i) {
+    const EffectParamDesc &desc = descs[i];
+    args[0].value_uint32 = desc.id;
+    helper_->AddCommand(DESTROY_PARAM, 1, args);
+    param_id_allocator_->FreeID(desc.id);
+  }
+}
+
+}  // namespace command_buffer
+}  // namespace o3d