Geometry Nodes: String to Curves Node

This commit adds a node that generates a text paragraph as curve
instances. The inputs on the node control the overall shape of the
paragraph, and other nodes can be used to move the individual instances
afterwards. To output more than one line, the "Special Characters" node
can be used.

The node outputs instances instead of real geometry so that it doesn't
have to duplicate work for every character afterwards. This is much
more efficient, because all of the curve evaluation and nodes like fill
curve don't have to repeat the same calculation for every instance of
the same character.

In the future, the instances component will support attributes, and the
node can output attribute fields like "Word Index" and "Line Index".

Differential Revision: https://developer.blender.org/D11522

1 files changed, 32 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_node_types.h b/source/blender/makesdna/DNA_node_types.h
index 6e4737b7d07..35a2dba627a 100644
--- a/source/blender/makesdna/DNA_node_types.h
+++ b/source/blender/makesdna/DNA_node_types.h
@@ -1502,6 +1502,16 @@ typedef struct NodeGeometryAttributeCapture {
   int8_t domain;
 } NodeGeometryAttributeCapture;
 
+typedef struct NodeGeometryStringToCurves {
+  /* GeometryNodeStringToCurvesOverflowMode */
+  uint8_t overflow;
+  /* GeometryNodeStringToCurvesAlignXMode */
+  uint8_t align_x;
+  /* GeometryNodeStringToCurvesAlignYMode */
+  uint8_t align_y;
+  char _pad[1];
+} NodeGeometryStringToCurves;
+
 /* script node mode */
 #define NODE_SCRIPT_INTERNAL 0
 #define NODE_SCRIPT_EXTERNAL 1
@@ -2098,6 +2108,28 @@ typedef enum GeometryNodeCurveFillMode {
   GEO_NODE_CURVE_FILL_MODE_NGONS = 1,
 } GeometryNodeCurveFillMode;
 
+typedef enum GeometryNodeStringToCurvesOverflowMode {
+  GEO_NODE_STRING_TO_CURVES_MODE_OVERFLOW = 0,
+  GEO_NODE_STRING_TO_CURVES_MODE_SCALE_TO_FIT = 1,
+  GEO_NODE_STRING_TO_CURVES_MODE_TRUNCATE = 2,
+} GeometryNodeStringToCurvesOverflowMode;
+
+typedef enum GeometryNodeStringToCurvesAlignXMode {
+  GEO_NODE_STRING_TO_CURVES_ALIGN_X_LEFT = 0,
+  GEO_NODE_STRING_TO_CURVES_ALIGN_X_CENTER = 1,
+  GEO_NODE_STRING_TO_CURVES_ALIGN_X_RIGHT = 2,
+  GEO_NODE_STRING_TO_CURVES_ALIGN_X_JUSTIFY = 3,
+  GEO_NODE_STRING_TO_CURVES_ALIGN_X_FLUSH = 4,
+} GeometryNodeStringToCurvesAlignXMode;
+
+typedef enum GeometryNodeStringToCurvesAlignYMode {
+  GEO_NODE_STRING_TO_CURVES_ALIGN_Y_TOP_BASELINE = 0,
+  GEO_NODE_STRING_TO_CURVES_ALIGN_Y_TOP = 1,
+  GEO_NODE_STRING_TO_CURVES_ALIGN_Y_MIDDLE = 2,
+  GEO_NODE_STRING_TO_CURVES_ALIGN_Y_BOTTOM_BASELINE = 3,
+  GEO_NODE_STRING_TO_CURVES_ALIGN_Y_BOTTOM = 4,
+} GeometryNodeStringToCurvesAlignYMode;
+
 #ifdef __cplusplus
 }
 #endif