Geometry Nodes: Expand the Boolean Math node

Currently the Boolean Math node only has 3 basic logic gates:
AND, OR, and NOT. This commit adds 6 additional logic gates
for convenience and ease of use.

- **Not And (NAND)** returns true when at least one input is false.
- **Nor (NOR)** returns true when both inputs are false.
- **Equal (XNOR)** returns true when both inputs are equal.
- **Not Equal (XOR)** returns true when both inputs are different.
- **Imply (IMPLY)** returns true unless the first input is true and
  the second is false.
- **Subtract (NIMPLY)** returns true when the first input is true and
  the second is false.

Differential Revision: https://developer.blender.org/D13774

source/blender/makesdna/DNA_node_types.h

@@ -1931,6 +1931,14 @@ enum {
   NODE_BOOLEAN_MATH_AND = 0,
   NODE_BOOLEAN_MATH_OR = 1,
   NODE_BOOLEAN_MATH_NOT = 2,
+
+  NODE_BOOLEAN_MATH_NAND = 3,
+  NODE_BOOLEAN_MATH_NOR = 4,
+  NODE_BOOLEAN_MATH_XNOR = 5,
+  NODE_BOOLEAN_MATH_XOR = 6,
+
+  NODE_BOOLEAN_MATH_IMPLY = 7,
+  NODE_BOOLEAN_MATH_NIMPLY = 8,
 };
 
 /** Float compare node operations. */

source/blender/makesrna/intern/rna_nodetree.c

@@ -300,9 +300,33 @@ const EnumPropertyItem rna_enum_node_vec_math_items[] = {
 };
 
 const EnumPropertyItem rna_enum_node_boolean_math_items[] = {
-    {NODE_BOOLEAN_MATH_AND, "AND", 0, "And", "Outputs true only when both inputs are true"},
-    {NODE_BOOLEAN_MATH_OR, "OR", 0, "Or", "Outputs or when at least one of the inputs is true"},
-    {NODE_BOOLEAN_MATH_NOT, "NOT", 0, "Not", "Outputs the opposite of the input"},
+    {NODE_BOOLEAN_MATH_AND, "AND", 0, "And", "True when both inputs are true"},
+    {NODE_BOOLEAN_MATH_OR, "OR", 0, "Or", "True when at least one input is true"},
+    {NODE_BOOLEAN_MATH_NOT, "NOT", 0, "Not", "Opposite of the input"},
+    {0, "", ICON_NONE, NULL, NULL},
+    {NODE_BOOLEAN_MATH_NAND, "NAND", 0, "Not And", "True when at least one input is false"},
+    {NODE_BOOLEAN_MATH_NOR, "NOR", 0, "Nor", "True when both inputs are false"},
+    {NODE_BOOLEAN_MATH_XNOR,
+     "XNOR",
+     0,
+     "Equal",
+     "True when both inputs are equal (exclusive nor)"},
+    {NODE_BOOLEAN_MATH_XOR,
+     "XOR",
+     0,
+     "Not Equal",
+     "True when both inputs are different (exclusive or)"},
+    {0, "", ICON_NONE, NULL, NULL},
+    {NODE_BOOLEAN_MATH_IMPLY,
+     "IMPLY",
+     0,
+     "Imply",
+     "True unless the first input is true and the second is false"},
+    {NODE_BOOLEAN_MATH_NIMPLY,
+     "NIMPLY",
+     0,
+     "Subtract",
+     "True when the first input is true and the second is false (not imply)"},
     {0, NULL, 0, NULL, NULL},
 };
 

source/blender/nodes/function/nodes/node_fn_boolean_math.cc

@@ -43,8 +43,7 @@ static void node_boolean_math_update(bNodeTree *ntree, bNode *node)
 {
   bNodeSocket *sockB = (bNodeSocket *)BLI_findlink(&node->inputs, 1);
 
-  nodeSetSocketAvailability(
-      ntree, sockB, ELEM(node->custom1, NODE_BOOLEAN_MATH_AND, NODE_BOOLEAN_MATH_OR));
+  nodeSetSocketAvailability(ntree, sockB, !ELEM(node->custom1, NODE_BOOLEAN_MATH_NOT));
 }
 
 static void node_boolean_math_label(const bNodeTree *UNUSED(ntree),
@@ -67,6 +66,18 @@ static const fn::MultiFunction *get_multi_function(bNode &bnode)
   static fn::CustomMF_SI_SI_SO<bool, bool, bool> or_fn{"Or",
                                                        [](bool a, bool b) { return a || b; }};
   static fn::CustomMF_SI_SO<bool, bool> not_fn{"Not", [](bool a) { return !a; }};
+  static fn::CustomMF_SI_SI_SO<bool, bool, bool> nand_fn{"Not And",
+                                                         [](bool a, bool b) { return !(a && b); }};
+  static fn::CustomMF_SI_SI_SO<bool, bool, bool> nor_fn{"Nor",
+                                                        [](bool a, bool b) { return !(a || b); }};
+  static fn::CustomMF_SI_SI_SO<bool, bool, bool> xnor_fn{"Equal",
+                                                         [](bool a, bool b) { return a == b; }};
+  static fn::CustomMF_SI_SI_SO<bool, bool, bool> xor_fn{"Not Equal",
+                                                        [](bool a, bool b) { return a != b; }};
+  static fn::CustomMF_SI_SI_SO<bool, bool, bool> imply_fn{"Imply",
+                                                          [](bool a, bool b) { return !a || b; }};
+  static fn::CustomMF_SI_SI_SO<bool, bool, bool> nimply_fn{"Subtract",
+                                                           [](bool a, bool b) { return a && !b; }};
 
   switch (bnode.custom1) {
     case NODE_BOOLEAN_MATH_AND:
@@ -75,6 +86,18 @@ static const fn::MultiFunction *get_multi_function(bNode &bnode)
       return &or_fn;
     case NODE_BOOLEAN_MATH_NOT:
       return &not_fn;
+    case NODE_BOOLEAN_MATH_NAND:
+      return &nand_fn;
+    case NODE_BOOLEAN_MATH_NOR:
+      return &nor_fn;
+    case NODE_BOOLEAN_MATH_XNOR:
+      return &xnor_fn;
+    case NODE_BOOLEAN_MATH_XOR:
+      return &xor_fn;
+    case NODE_BOOLEAN_MATH_IMPLY:
+      return &imply_fn;
+    case NODE_BOOLEAN_MATH_NIMPLY:
+      return &nimply_fn;
   }
 
   BLI_assert_unreachable();