Geometry Nodes: new Image Texture node

This adds a new image texture node for geometry nodes. It does not
reuse the same node that is used in shading, because we want to be
able to expose the image and frame as sockets.

There is a known update issue when a movie or image sequence is
used. That will be fixed separately (also see D12957).

Currently, the image socket is just a pointer to an Image ID data block.
This can contain single images but also movies and image sequences.
In the future, the definition of an image socket can be expanded to
include images that are generated from scratch in the node tree.
For more details read the discussion in D12827.

Some of the code is a direct port from cycles and should be cleaned
up a bit in the future. For example `image_cubic_texture_lookup`.

For still images, the frame input is ignored. Otherwise, the frame
has to be in a valid range for the node to work. In the future we
may add e.g. automatic looping functionality.

Differential Revision: https://developer.blender.org/D12827

1 files changed, 46 insertions, 5 deletions

diff --git a/source/blender/makesrna/intern/rna_nodetree.c b/source/blender/makesrna/intern/rna_nodetree.c
index f0508ee5317..8daf311fbfe 100644
--- a/source/blender/makesrna/intern/rna_nodetree.c
+++ b/source/blender/makesrna/intern/rna_nodetree.c
@@ -5022,10 +5022,8 @@ static void def_fn_input_bool(StructRNA *srna)
 
   prop = RNA_def_property(srna, "boolean", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "boolean", 1);
-  RNA_def_property_ui_text(
-    prop, "Boolean", "Input value used for unconnected socket");
+  RNA_def_property_ui_text(prop, "Boolean", "Input value used for unconnected socket");
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_update");
-
 }
 
 static void def_fn_input_int(StructRNA *srna)
@@ -5037,8 +5035,7 @@ static void def_fn_input_int(StructRNA *srna)
   prop = RNA_def_property(srna, "integer", PROP_INT, PROP_NONE);
   RNA_def_property_int_sdna(prop, NULL, "integer");
   RNA_def_property_int_default(prop, 1);
-  RNA_def_property_ui_text(
-    prop, "Integer", "Input value used for unconnected socket");
+  RNA_def_property_ui_text(prop, "Integer", "Input value used for unconnected socket");
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_update");
 }
 
@@ -5416,6 +5413,50 @@ static void def_sh_tex_image(StructRNA *srna)
   RNA_def_property_update(prop, 0, "rna_Node_update");
 }
 
+static void def_geo_image_texture(StructRNA *srna)
+{
+  static const EnumPropertyItem fn_tex_prop_interpolation_items[] = {
+      {SHD_INTERP_LINEAR, "Linear", 0, "Linear", "Linear interpolation"},
+      {SHD_INTERP_CLOSEST, "Closest", 0, "Closest", "No interpolation (sample closest texel)"},
+      {SHD_INTERP_CUBIC, "Cubic", 0, "Cubic", "Cubic interpolation"},
+      {0, NULL, 0, NULL, NULL},
+  };
+
+  static const EnumPropertyItem prop_image_extension[] = {
+      {SHD_IMAGE_EXTENSION_REPEAT,
+       "REPEAT",
+       0,
+       "Repeat",
+       "Cause the image to repeat horizontally and vertically"},
+      {SHD_IMAGE_EXTENSION_EXTEND,
+       "EXTEND",
+       0,
+       "Extend",
+       "Extend by repeating edge pixels of the image"},
+      {SHD_IMAGE_EXTENSION_CLIP,
+       "CLIP",
+       0,
+       "Clip",
+       "Clip to image size and set exterior pixels as transparent"},
+      {0, NULL, 0, NULL, NULL},
+  };
+
+  PropertyRNA *prop;
+
+  RNA_def_struct_sdna_from(srna, "NodeGeometryImageTexture", "storage");
+
+  prop = RNA_def_property(srna, "interpolation", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_items(prop, fn_tex_prop_interpolation_items);
+  RNA_def_property_ui_text(prop, "Interpolation", "Method for smoothing values between pixels");
+  RNA_def_property_update(prop, 0, "rna_Node_update");
+
+  prop = RNA_def_property(srna, "extension", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_items(prop, prop_image_extension);
+  RNA_def_property_ui_text(
+      prop, "Extension", "How the image is extrapolated past its original bounds");
+  RNA_def_property_update(prop, 0, "rna_Node_update");
+}
+
 static void def_sh_tex_gradient(StructRNA *srna)
 {
   static const EnumPropertyItem prop_gradient_type[] = {