Cleanup: Nodes: Begin splitting shader node buttons into individual files

Currently, most node buttons are defined in `drawnode.cc` however,
this is inconvenient because it requires editing many files when adding new nodes.
The goal is to minimize the number of files needed to add or update a node.

This commit moves most of the node layout functions for shader nodes into their respected
source/blender/nodes/shader/nodes file.

In the future, these functions will be simplified to node_layout.

Some nodes were left in `drawnode.cc` as this would require duplicating code
while this is likely fine it is best to leave that to a seperate commit.

1 files changed, 47 insertions, 0 deletions

diff --git a/source/blender/nodes/shader/nodes/node_shader_tex_sky.cc b/source/blender/nodes/shader/nodes/node_shader_tex_sky.cc
index 209d71db1ff..b8728d69bba 100644
--- a/source/blender/nodes/shader/nodes/node_shader_tex_sky.cc
+++ b/source/blender/nodes/shader/nodes/node_shader_tex_sky.cc
@@ -20,6 +20,12 @@
 #include "node_shader_util.hh"
 #include "sky_model.h"
 
+#include "BKE_context.h"
+#include "BKE_scene.h"
+
+#include "UI_interface.h"
+#include "UI_resources.h"
+
 namespace blender::nodes::node_shader_tex_sky_cc {
 
 static void node_declare(NodeDeclarationBuilder &b)
@@ -28,6 +34,46 @@ static void node_declare(NodeDeclarationBuilder &b)
   b.add_output<decl::Color>(N_("Color")).no_muted_links();
 }
 
+static void node_shader_buts_tex_sky(uiLayout *layout, bContext *C, PointerRNA *ptr)
+{
+  uiItemR(layout, ptr, "sky_type", UI_ITEM_R_SPLIT_EMPTY_NAME, "", ICON_NONE);
+
+  if (RNA_enum_get(ptr, "sky_type") == SHD_SKY_PREETHAM) {
+    uiItemR(layout, ptr, "sun_direction", UI_ITEM_R_SPLIT_EMPTY_NAME, "", ICON_NONE);
+    uiItemR(layout, ptr, "turbidity", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+  }
+  if (RNA_enum_get(ptr, "sky_type") == SHD_SKY_HOSEK) {
+    uiItemR(layout, ptr, "sun_direction", UI_ITEM_R_SPLIT_EMPTY_NAME, "", ICON_NONE);
+    uiItemR(layout, ptr, "turbidity", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+    uiItemR(layout, ptr, "ground_albedo", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+  }
+  if (RNA_enum_get(ptr, "sky_type") == SHD_SKY_NISHITA) {
+    Scene *scene = CTX_data_scene(C);
+    if (BKE_scene_uses_blender_eevee(scene)) {
+      uiItemL(layout, TIP_("Nishita not available in Eevee"), ICON_ERROR);
+    }
+    uiItemR(layout, ptr, "sun_disc", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, 0);
+
+    uiLayout *col;
+    if (RNA_boolean_get(ptr, "sun_disc")) {
+      col = uiLayoutColumn(layout, true);
+      uiItemR(col, ptr, "sun_size", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+      uiItemR(col, ptr, "sun_intensity", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+    }
+
+    col = uiLayoutColumn(layout, true);
+    uiItemR(col, ptr, "sun_elevation", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+    uiItemR(col, ptr, "sun_rotation", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+
+    uiItemR(layout, ptr, "altitude", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+
+    col = uiLayoutColumn(layout, true);
+    uiItemR(col, ptr, "air_density", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+    uiItemR(col, ptr, "dust_density", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+    uiItemR(col, ptr, "ozone_density", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
+  }
+}
+
 static void node_shader_init_tex_sky(bNodeTree *UNUSED(ntree), bNode *node)
 {
   NodeTexSky *tex = MEM_cnew<NodeTexSky>("NodeTexSky");
@@ -210,6 +256,7 @@ void register_node_type_sh_tex_sky()
 
   sh_node_type_base(&ntype, SH_NODE_TEX_SKY, "Sky Texture", NODE_CLASS_TEXTURE);
   ntype.declare = file_ns::node_declare;
+  ntype.draw_buttons = file_ns::node_shader_buts_tex_sky;
   node_type_size_preset(&ntype, NODE_SIZE_MIDDLE);
   node_type_init(&ntype, file_ns::node_shader_init_tex_sky);
   node_type_storage(&ntype, "NodeTexSky", node_free_standard_storage, node_copy_standard_storage);