1 files changed, 95 insertions, 0 deletions
diff --git a/libs/renderengine/Mesh.cpp b/libs/renderengine/Mesh.cpp
new file mode 100644
index 0000000000..6a40c6c680
--- /dev/null
+++ b/libs/renderengine/Mesh.cpp
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2013 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.
+ */
+
+#include <renderengine/Mesh.h>
+
+#include <utils/Log.h>
+
+namespace android {
+namespace renderengine {
+
+Mesh::Mesh(Primitive primitive, size_t vertexCount, size_t vertexSize, size_t texCoordSize)
+      : mVertexCount(vertexCount),
+        mVertexSize(vertexSize),
+        mTexCoordsSize(texCoordSize),
+        mPrimitive(primitive) {
+    if (vertexCount == 0) {
+        mVertices.resize(1);
+        mVertices[0] = 0.0f;
+        mStride = 0;
+        return;
+    }
+
+    size_t stride = vertexSize + texCoordSize;
+    size_t remainder = (stride * vertexCount) / vertexCount;
+    // Since all of the input parameters are unsigned, if stride is less than
+    // either vertexSize or texCoordSize, it must have overflowed. remainder
+    // will be equal to stride as long as stride * vertexCount doesn't overflow.
+    if ((stride < vertexSize) || (remainder != stride)) {
+        ALOGE("Overflow in Mesh(..., %zu, %zu, %zu)", vertexCount, vertexSize, texCoordSize);
+        mVertices.resize(1);
+        mVertices[0] = 0.0f;
+        mVertexCount = 0;
+        mVertexSize = 0;
+        mTexCoordsSize = 0;
+        mStride = 0;
+        return;
+    }
+
+    mVertices.resize(stride * vertexCount);
+    mStride = stride;
+}
+
+Mesh::Primitive Mesh::getPrimitive() const {
+    return mPrimitive;
+}
+
+float const* Mesh::getPositions() const {
+    return mVertices.data();
+}
+float* Mesh::getPositions() {
+    return mVertices.data();
+}
+
+float const* Mesh::getTexCoords() const {
+    return mVertices.data() + mVertexSize;
+}
+float* Mesh::getTexCoords() {
+    return mVertices.data() + mVertexSize;
+}
+
+size_t Mesh::getVertexCount() const {
+    return mVertexCount;
+}
+
+size_t Mesh::getVertexSize() const {
+    return mVertexSize;
+}
+
+size_t Mesh::getTexCoordsSize() const {
+    return mTexCoordsSize;
+}
+
+size_t Mesh::getByteStride() const {
+    return mStride * sizeof(float);
+}
+
+size_t Mesh::getStride() const {
+    return mStride;
+}
+
+} // namespace renderengine
+} // namespace android