pgraph: fix alignment error in 32-bit Windows with Eigen

Fixes #251

panda/src/pgraph/nodePath.cxx

@@ -3262,7 +3262,7 @@ get_shader() const {
  *
  */
 void NodePath::
-set_shader_input(ShaderInput inp) {
+set_shader_input(const ShaderInput &inp) {
   nassertv_always(!is_empty());
 
   PandaNode *pnode = node();
@@ -3278,6 +3278,26 @@ set_shader_input(ShaderInput inp) {
   }
 }
 
+/**
+ *
+ */
+void NodePath::
+set_shader_input(ShaderInput &&inp) {
+  nassertv_always(!is_empty());
+
+  PandaNode *pnode = node();
+  const RenderAttrib *attrib =
+    pnode->get_attrib(ShaderAttrib::get_class_slot());
+  if (attrib != nullptr) {
+    const ShaderAttrib *sa = (const ShaderAttrib *)attrib;
+    pnode->set_attrib(sa->set_shader_input(move(inp)));
+  } else {
+    // Create a new ShaderAttrib for this node.
+    CPT(ShaderAttrib) sa = DCAST(ShaderAttrib, ShaderAttrib::make());
+    pnode->set_attrib(sa->set_shader_input(move(inp)));
+  }
+}
+
 /**
  *
  */

panda/src/pgraph/nodePath.h

@@ -629,7 +629,8 @@ PUBLISHED:
   void set_shader_auto(BitMask32 shader_switch, int priority=0);
   void clear_shader();
 
-  void set_shader_input(ShaderInput input);
+  void set_shader_input(const ShaderInput &input);
+  void set_shader_input(ShaderInput &&input);
 
   INLINE void set_shader_input(CPT_InternalName id, Texture *tex, const SamplerState &sampler, int priority=0);
   INLINE void set_shader_input(CPT_InternalName id, Texture *tex, bool read, bool write, int z=-1, int n=0, int priority=0);

panda/src/pgraph/shaderAttrib.cxx

@@ -195,7 +195,22 @@ clear_flag(int flag) const {
  *
  */
 CPT(RenderAttrib) ShaderAttrib::
-set_shader_input(ShaderInput input) const {
+set_shader_input(const ShaderInput &input) const {
+  ShaderAttrib *result = new ShaderAttrib(*this);
+  Inputs::iterator i = result->_inputs.find(input.get_name());
+  if (i == result->_inputs.end()) {
+    result->_inputs.insert(Inputs::value_type(input.get_name(), input));
+  } else {
+    i->second = input;
+  }
+  return return_new(result);
+}
+
+/**
+ *
+ */
+CPT(RenderAttrib) ShaderAttrib::
+set_shader_input(ShaderInput &&input) const {
   ShaderAttrib *result = new ShaderAttrib(*this);
   Inputs::iterator i = result->_inputs.find(input.get_name());
   if (i == result->_inputs.end()) {

panda/src/pgraph/shaderAttrib.h

@@ -71,7 +71,8 @@ PUBLISHED:
 
   CPT(RenderAttrib) clear_shader() const;
   // Shader Inputs
-  CPT(RenderAttrib) set_shader_input(ShaderInput input) const;
+  CPT(RenderAttrib) set_shader_input(const ShaderInput &input) const;
+  CPT(RenderAttrib) set_shader_input(ShaderInput &&input) const;
 
 public:
   INLINE CPT(RenderAttrib) set_shader_input(CPT_InternalName id, Texture *tex,       int priority=0) const;