UI: ShaderFx Drag and Drop, Layout Updates

This patch implements the list panel system D7490 for grease pencil
shader effects. It also moves their drawing to a callback in
ShaderFxTypeInfo in line with the extensible architecture refactoring
goal T75724.

The implementation is basically exactly the same as for the modifier
patch (9b099c86123fc82).

Thanks to Matias Mendiola (@mendio) for helping to develop the layout
changes.

Differential Revision: https://developer.blender.org/D7985

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_shader_fx.h b/source/blender/blenkernel/BKE_shader_fx.h
index bdc782a606e..31e14c6c884 100644
--- a/source/blender/blenkernel/BKE_shader_fx.h
+++ b/source/blender/blenkernel/BKE_shader_fx.h
@@ -28,6 +28,7 @@
 extern "C" {
 #endif
 
+struct ARegionType;
 struct ID;
 struct ListBase;
 struct ModifierUpdateDepsgraphContext;
@@ -157,11 +158,17 @@ typedef struct ShaderFxTypeInfo {
                         struct Object *ob,
                         ShaderFxIDWalkFunc walk,
                         void *userData);
+
+  /* Register the panel types for the effect's UI. */
+  void (*panelRegister)(struct ARegionType *region_type);
 } ShaderFxTypeInfo;
 
+#define SHADERFX_TYPE_PANEL_PREFIX "FX_PT_"
+
 /* Initialize  global data (type info and some common global storages). */
 void BKE_shaderfx_init(void);
 
+void BKE_shaderfxType_panel_id(ShaderFxType type, char *panel_id);
 const ShaderFxTypeInfo *BKE_shaderfx_get_info(ShaderFxType type);
 struct ShaderFxData *BKE_shaderfx_new(int type);
 void BKE_shaderfx_free_ex(struct ShaderFxData *fx, const int flag);