Expand RS vector3 types to vector4.

BUG=5609007

The underlying LLVM implementation for vector3 types does this implicitly. If
RS does not adjust its implementation, we will always be misaligned for any
subsequent data after a vector3 type. We previously inserted padding into the
reflected layers from llvm-rs-cc (hence the skip padding part of this change).
We can safely ignore the padding now that the Java/native code is updated to
use the expanded size. The compiler will also need modification to ensure that
we don't mistakenly skip over any end-of-struct padding.

Fixing the 3 component vector padding problem.

Change-Id: If68af42287deb8f4b28addcd19a9fa314656be44

1 files changed, 17 insertions, 0 deletions

diff --git a/rsElement.cpp b/rsElement.cpp
index df90ce49..56c31b66 100644
--- a/rsElement.cpp
+++ b/rsElement.cpp
@@ -23,6 +23,7 @@ using namespace android::renderscript;
 
 Element::Element(Context *rsc) : ObjectBase(rsc) {
     mBits = 0;
+    mBitsUnpadded = 0;
     mFields = NULL;
     mFieldCount = 0;
     mHasReference = false;
@@ -60,6 +61,18 @@ size_t Element::getSizeBits() const {
     return total;
 }
 
+size_t Element::getSizeBitsUnpadded() const {
+    if (!mFieldCount) {
+        return mBitsUnpadded;
+    }
+
+    size_t total = 0;
+    for (size_t ct=0; ct < mFieldCount; ct++) {
+        total += mFields[ct].e->mBitsUnpadded * mFields[ct].arraySize;
+    }
+    return total;
+}
+
 void Element::dumpLOGV(const char *prefix) const {
     ObjectBase::dumpLOGV(prefix);
     ALOGV("%s Element: fieldCount: %zu,  size bytes: %zu", prefix, mFieldCount, getSizeBytes());
@@ -146,14 +159,18 @@ Element *Element::createFromStream(Context *rsc, IStream *stream) {
 void Element::compute() {
     if (mFieldCount == 0) {
         mBits = mComponent.getBits();
+        mBitsUnpadded = mComponent.getBitsUnpadded();
         mHasReference = mComponent.isReference();
         return;
     }
 
     size_t bits = 0;
+    size_t bitsUnpadded = 0;
     for (size_t ct=0; ct < mFieldCount; ct++) {
         mFields[ct].offsetBits = bits;
+        mFields[ct].offsetBitsUnpadded = bitsUnpadded;
         bits += mFields[ct].e->getSizeBits() * mFields[ct].arraySize;
+        bitsUnpadded += mFields[ct].e->getSizeBitsUnpadded() * mFields[ct].arraySize;
 
         if (mFields[ct].e->mHasReference) {
             mHasReference = true;