Reviewers: dev-osl_imagworks.com, osl-dev_googlegroups.com,

Description:
Array assignment was incorrectly clearing the derivatives of all entries
instead of just the derivatives of the entry being assigned.

Please review this at http://codereview.appspot.com/205043/show

Affected files:
src/liboslexec/oparray.cpp


Index: src/liboslexec/oparray.cpp
===================================================================
--- src/liboslexec/oparray.cpp (revision 571)
+++ src/liboslexec/oparray.cpp (working copy)
@@ -176,8 +176,12 @@
// Uniform case
int ind = *index;
(&result[0])[ind] = *src;
- if (Result.has_derivs ())
- exec->zero_derivs (Result);
+ if (Result.has_derivs ()) {
+ // write 0's to this element only
+ int len = Result.typespec().arraylength();
+ memset(&((&result[0])[ind + len]), 0, sizeof(T));
+ memset(&((&result[0])[ind + 2 * len]), 0, sizeof(T));
+ }
} else if (index.is_uniform()) {
// Uniform index, potentially varying src array
int ind = *index;
@@ -186,16 +190,20 @@
(&result[i])[ind] = src[i];

if (Result.has_derivs()) {
+ int len = Result.typespec().arraylength();
if (Src.is_varying() && Src.has_derivs()) {
- int len = Result.typespec().arraylength();
VaryingRef<Dual2<T> > src ((Dual2<T> *)Src.data(), Src.step());
for (int i = beginpoint; i < endpoint; ++i)
if (runflags[i]) {
- (&result[i])[ind+len] = src[i].dx();
- (&result[i])[ind+2*len] = src[i].dy();
+ (&result[i])[ind + len] = src[i].dx();
+ (&result[i])[ind + 2 * len] = src[i].dy();
}
} else {
- exec->zero_derivs (Result);
+ for (int i = beginpoint; i < endpoint; ++i)
+ if (runflags[i]) {
+ memset(&((&result[i])[ind + len]), 0, sizeof(T));
+ memset(&((&result[i])[ind + 2 * len]), 0, sizeof(T));
+ }
}
}
} else {
@@ -205,16 +213,21 @@
(&result[i])[index[i]] = src[i];

if (Result.has_derivs()) {
+ int len = Result.typespec().arraylength();
if (Src.is_varying() && Src.has_derivs()) {
- int len = Result.typespec().arraylength();
VaryingRef<Dual2<T> > src ((Dual2<T> *)Src.data(), Src.step());
for (int i = beginpoint; i < endpoint; ++i)
if (runflags[i]) {
- (&result[i])[index[i]+len] = src[i].dx();
- (&result[i])[index[i]+2*len] = src[i].dy();
+ (&result[i])[index[i] + len] = src[i].dx();
+ (&result[i])[index[i] + 2 * len] = src[i].dy();
}
} else {
- exec->zero_derivs (Result);
+ for (int i = beginpoint; i < endpoint; ++i)
+ if (runflags[i]) {
+ memset(&((&result[i])[index[i] + len]), 0, sizeof(T));
+ memset(&((&result[i])[index[i] + 2 * len]), 0, sizeof(T));
+ }
+
}
}
}