layers:Add BINDABLE superclass for image/buffer state

Support for sparse memory binding is virually non-existant in current
validation layers. This is a first step down a long path to improve
sparse binding support.

The BINDABLE superclass is sub-classed by IMAGE & BUFFER state objs
and contains memory binding info in both the single binding and
sparse binding cases.

Bindings are initially encapsulated in the new MEM_BINDING struct.
For single binding cases, things are almost exactly the same as they
have always been. For sparse binding, the various bindings will be
stored in the sparse_bindings set where we initally don't have complete
information on the sparse binding as we only store the MEM_BINDING info
but this is a start.

1 files changed, 3 insertions, 3 deletions

diff --git a/layers/descriptor_sets.cpp b/layers/descriptor_sets.cpp
index a5f6b0cc..1e22f82c 100644
--- a/layers/descriptor_sets.cpp
+++ b/layers/descriptor_sets.cpp
@@ -386,12 +386,12 @@ bool cvdescriptorset::DescriptorSet::ValidateDrawState(const std::map<uint32_t,
                             *error = error_str.str();
                             return false;
                         } else {
-                            auto mem_entry = getMemObjInfo(device_data_, buffer_node->mem);
+                            auto mem_entry = getMemObjInfo(device_data_, buffer_node->binding.mem);
                             if (!mem_entry) {
                                 std::stringstream error_str;
                                 error_str << "Descriptor in binding #" << binding << " at global descriptor index " << i
-                                          << " uses buffer " << buffer << " that references invalid memory " << buffer_node->mem
-                                          << ".";
+                                          << " uses buffer " << buffer << " that references invalid memory "
+                                          << buffer_node->binding.mem << ".";
                                 *error = error_str.str();
                                 return false;
                             }