1 files changed, 76 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.gldebugger/src/com/android/ide/eclipse/gltrace/state/transforms/BufferSubDataTransform.java b/eclipse/plugins/com.android.ide.eclipse.gldebugger/src/com/android/ide/eclipse/gltrace/state/transforms/BufferSubDataTransform.java
new file mode 100644
index 000000000..393f1b9b7
--- /dev/null
+++ b/eclipse/plugins/com.android.ide.eclipse.gldebugger/src/com/android/ide/eclipse/gltrace/state/transforms/BufferSubDataTransform.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.ide.eclipse.gltrace.state.transforms;
+
+import com.android.ide.eclipse.gltrace.GLProtoBuf.GLMessage.Function;
+import com.android.ide.eclipse.gltrace.state.IGLProperty;
+
+import java.nio.ByteBuffer;
+
+/**
+ * A {@link BufferSubDataTransform} updates a portion of the buffer data as specified by
+ * the {@link Function#glBufferSubData} function.
+ */
+public class BufferSubDataTransform implements IStateTransform {
+    private final IGLPropertyAccessor mAccessor;
+    private final int mOffset;
+
+    private final byte[] mSubData;
+    private byte[] mOldData;
+    private byte[] mNewData;
+
+    public BufferSubDataTransform(IGLPropertyAccessor accessor, int offset, byte[] data) {
+        mAccessor = accessor;
+        mOffset = offset;
+        mSubData = data;
+    }
+
+    @Override
+    public void apply(IGLProperty state) {
+        IGLProperty property = mAccessor.getProperty(state);
+        mOldData = (byte[]) property.getValue();
+
+        if (mOldData != null) {
+            mNewData = new byte[mOldData.length];
+            ByteBuffer bb = ByteBuffer.wrap(mNewData);
+
+            // copy all of the old buffer
+            bb.put(mOldData);
+            bb.rewind();
+
+            // update with the sub buffer data at specified offset
+            bb.position(mOffset);
+            bb.put(mSubData);
+        }
+
+        property.setValue(mNewData);
+    }
+
+    @Override
+    public void revert(IGLProperty state) {
+        if (mOldData != null) {
+            IGLProperty property = mAccessor.getProperty(state);
+            property.setValue(mOldData);
+            mOldData = null;
+        }
+    }
+
+    @Override
+    public IGLProperty getChangedProperty(IGLProperty state) {
+        return mAccessor.getProperty(state);
+    }
+}