Geometry Nodes: Add explicit Float to Int conversion node

This patch adds a very simple node that explicitly converts a float to
an int. While this may seem redundant, it would offer 2 benefits to the
current requirement to use implicit float conversions:
 1. It makes the node tree's intent more clear and self-documenting
    (especially if changes in the future require integer inputs).
 2. It eliminates undefined behavior in current/future nodes from float
    inputs by guaranteeing that the input is an integer.

The node offers a variety of rounding techniques to make it more flexible.

Differential Revision: https://developer.blender.org/D11700

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_node_types.h b/source/blender/makesdna/DNA_node_types.h
index 54bd792294f..f1ad41a4492 100644
--- a/source/blender/makesdna/DNA_node_types.h
+++ b/source/blender/makesdna/DNA_node_types.h
@@ -1688,6 +1688,14 @@ typedef enum FloatCompareOperation {
   NODE_FLOAT_COMPARE_NOT_EQUAL = 5,
 } FloatCompareOperation;
 
+/* Float to Int node operations. */
+typedef enum FloatToIntRoundingMode {
+  FN_NODE_FLOAT_TO_INT_ROUND = 0,
+  FN_NODE_FLOAT_TO_INT_FLOOR = 1,
+  FN_NODE_FLOAT_TO_INT_CEIL = 2,
+  FN_NODE_FLOAT_TO_INT_TRUNCATE = 3,
+} FloatToIntRoundingMode;
+
 /* Clamp node types. */
 enum {
   NODE_CLAMP_MINMAX = 0,