New Grease Pencil object for 2D animation

This commit merge the full development done in greasepencil-object branch and include mainly the following features.

- New grease pencil object.
- New drawing engine.
- New grease pencil modes Draw/Sculpt/Edit and Weight Paint.
- New brushes for grease pencil.
- New modifiers for grease pencil.
- New shaders FX.
- New material system (replace old palettes and colors).
- Split of annotations (old grease pencil) and new grease pencil object.
- UI adapted to blender 2.8.

You can get more info here:

https://code.blender.org/2017/12/drawing-2d-animation-in-blender-2-8/
https://code.blender.org/2018/07/grease-pencil-status-update/

This is the result of nearly two years of development and I want thanks firstly the other members of the grease pencil team: Daniel M. Lara, Matias Mendiola and Joshua Leung for their support, ideas and to keep working in the project all the time, without them this project had been impossible.

Also, I want thanks other Blender developers for their help, advices and to be there always to help me, and specially to Clément Foucault, Dalai Felinto, Pablo Vázquez and Campbell Barton.

1 files changed, 227 insertions, 188 deletions

diff --git a/source/blender/editors/space_outliner/outliner_draw.c b/source/blender/editors/space_outliner/outliner_draw.c
index 435e0018ac0..feab82a59c8 100644
--- a/source/blender/editors/space_outliner/outliner_draw.c
+++ b/source/blender/editors/space_outliner/outliner_draw.c
@@ -32,6 +32,7 @@
 #include "DNA_anim_types.h"
 #include "DNA_armature_types.h"
 #include "DNA_gpencil_types.h"
+#include "DNA_gpencil_modifier_types.h"
 #include "DNA_group_types.h"
 #include "DNA_lamp_types.h"
 #include "DNA_lightprobe_types.h"
@@ -50,6 +51,7 @@
 #include "BKE_context.h"
 #include "BKE_deform.h"
 #include "BKE_fcurve.h"
+#include "BKE_gpencil.h"
 #include "BKE_global.h"
 #include "BKE_idcode.h"
 #include "BKE_layer.h"
@@ -438,12 +440,16 @@ static void namebutton_cb(bContext *C, void *tsep, char *oldname)
 				}
 				case TSE_GP_LAYER:
 				{
-					bGPdata *gpd = (bGPdata *)tselem->id; // id = GP Datablock
+					bGPdata *gpd = (bGPdata *)tselem->id; /* id = GP Datablock */
 					bGPDlayer *gpl = te->directdata;
 
+					/* always make layer active */
+					BKE_gpencil_layer_setactive(gpd, gpl);
+
 					// XXX: name needs translation stuff
 					BLI_uniquename(&gpd->layers, gpl, "GP Layer", '.',
 					               offsetof(bGPDlayer, info), sizeof(gpl->info));
+
 					WM_event_add_notifier(C, NC_GPENCIL | ND_DATA, gpd);
 					break;
 				}
@@ -872,39 +878,6 @@ static void tselem_draw_icon_uibut(struct DrawIconArg *arg, int icon)
 
 }
 
-static void UNUSED_FUNCTION(tselem_draw_gp_icon_uibut)(struct DrawIconArg *arg, ID *id, bGPDlayer *gpl)
-{
-	/* restrict column clip - skip it for now... */
-	if (arg->x >= arg->xmax) {
-		/* pass */
-	}
-	else {
-		PointerRNA ptr;
-		const float eps = 0.001f;
-		const bool is_stroke_visible = (gpl->color[3] > eps);
-		const bool is_fill_visible = (gpl->fill[3] > eps);
-		float w = 0.5f  * UI_UNIT_X;
-		float h = 0.85f * UI_UNIT_Y;
-
-		RNA_pointer_create(id, &RNA_GPencilLayer, gpl, &ptr);
-
-		UI_block_align_begin(arg->block);
-
-		UI_block_emboss_set(arg->block, is_stroke_visible ? UI_EMBOSS : UI_EMBOSS_NONE);
-		uiDefButR(arg->block, UI_BTYPE_COLOR, 1, "", arg->xb, arg->yb, w, h,
-		          &ptr, "color", -1,
-		          0, 0, 0, 0, NULL);
-
-		UI_block_emboss_set(arg->block, is_fill_visible ? UI_EMBOSS : UI_EMBOSS_NONE);
-		uiDefButR(arg->block, UI_BTYPE_COLOR, 1, "", arg->xb + w, arg->yb, w, h,
-		          &ptr, "fill_color", -1,
-		          0, 0, 0, 0, NULL);
-
-		UI_block_emboss_set(arg->block, UI_EMBOSS_NONE);
-		UI_block_align_end(arg->block);
-	}
-}
-
 static void tselem_draw_icon(
         uiBlock *block, int xmax, float x, float y, TreeStoreElem *tselem, TreeElement *te,
         float alpha, const bool is_clickable)
@@ -969,156 +942,212 @@ static void tselem_draw_icon(
 			case TSE_MODIFIER:
 			{
 				Object *ob = (Object *)tselem->id;
-				ModifierData *md = BLI_findlink(&ob->modifiers, tselem->nr);
-				switch ((ModifierType)md->type) {
-					case eModifierType_Subsurf:
-						ICON_DRAW(ICON_MOD_SUBSURF);
-						break;
-					case eModifierType_Armature:
-						ICON_DRAW(ICON_MOD_ARMATURE);
-						break;
-					case eModifierType_Lattice:
-						ICON_DRAW(ICON_MOD_LATTICE);
-						break;
-					case eModifierType_Curve:
-						ICON_DRAW(ICON_MOD_CURVE);
-						break;
-					case eModifierType_Build:
-						ICON_DRAW(ICON_MOD_BUILD);
-						break;
-					case eModifierType_Mirror:
-						ICON_DRAW(ICON_MOD_MIRROR);
-						break;
-					case eModifierType_Decimate:
-						ICON_DRAW(ICON_MOD_DECIM);
-						break;
-					case eModifierType_Wave:
-						ICON_DRAW(ICON_MOD_WAVE);
-						break;
-					case eModifierType_Hook:
-						ICON_DRAW(ICON_HOOK);
-						break;
-					case eModifierType_Softbody:
-						ICON_DRAW(ICON_MOD_SOFT);
-						break;
-					case eModifierType_Boolean:
-						ICON_DRAW(ICON_MOD_BOOLEAN);
-						break;
-					case eModifierType_ParticleSystem:
-						ICON_DRAW(ICON_MOD_PARTICLES);
-						break;
-					case eModifierType_ParticleInstance:
-						ICON_DRAW(ICON_MOD_PARTICLES);
-						break;
-					case eModifierType_EdgeSplit:
-						ICON_DRAW(ICON_MOD_EDGESPLIT);
-						break;
-					case eModifierType_Array:
-						ICON_DRAW(ICON_MOD_ARRAY);
-						break;
-					case eModifierType_UVProject:
-					case eModifierType_UVWarp:  /* TODO, get own icon */
-						ICON_DRAW(ICON_MOD_UVPROJECT);
-						break;
-					case eModifierType_Displace:
-						ICON_DRAW(ICON_MOD_DISPLACE);
-						break;
-					case eModifierType_Shrinkwrap:
-						ICON_DRAW(ICON_MOD_SHRINKWRAP);
-						break;
-					case eModifierType_Cast:
-						ICON_DRAW(ICON_MOD_CAST);
-						break;
-					case eModifierType_MeshDeform:
-					case eModifierType_SurfaceDeform:
-						ICON_DRAW(ICON_MOD_MESHDEFORM);
-						break;
-					case eModifierType_Bevel:
-						ICON_DRAW(ICON_MOD_BEVEL);
-						break;
-					case eModifierType_Smooth:
-					case eModifierType_LaplacianSmooth:
-					case eModifierType_CorrectiveSmooth:
-						ICON_DRAW(ICON_MOD_SMOOTH);
-						break;
-					case eModifierType_SimpleDeform:
-						ICON_DRAW(ICON_MOD_SIMPLEDEFORM);
-						break;
-					case eModifierType_Mask:
-						ICON_DRAW(ICON_MOD_MASK);
-						break;
-					case eModifierType_Cloth:
-						ICON_DRAW(ICON_MOD_CLOTH);
-						break;
-					case eModifierType_Explode:
-						ICON_DRAW(ICON_MOD_EXPLODE);
-						break;
-					case eModifierType_Collision:
-					case eModifierType_Surface:
-						ICON_DRAW(ICON_MOD_PHYSICS);
-						break;
-					case eModifierType_Fluidsim:
-						ICON_DRAW(ICON_MOD_FLUIDSIM);
-						break;
-					case eModifierType_Multires:
-						ICON_DRAW(ICON_MOD_MULTIRES);
-						break;
-					case eModifierType_Smoke:
-						ICON_DRAW(ICON_MOD_SMOKE);
-						break;
-					case eModifierType_Solidify:
-						ICON_DRAW(ICON_MOD_SOLIDIFY);
-						break;
-					case eModifierType_Screw:
-						ICON_DRAW(ICON_MOD_SCREW);
-						break;
-					case eModifierType_Remesh:
-						ICON_DRAW(ICON_MOD_REMESH);
-						break;
-					case eModifierType_WeightVGEdit:
-					case eModifierType_WeightVGMix:
-					case eModifierType_WeightVGProximity:
-						ICON_DRAW(ICON_MOD_VERTEX_WEIGHT);
-						break;
-					case eModifierType_DynamicPaint:
-						ICON_DRAW(ICON_MOD_DYNAMICPAINT);
-						break;
-					case eModifierType_Ocean:
-						ICON_DRAW(ICON_MOD_OCEAN);
-						break;
-					case eModifierType_Warp:
-						ICON_DRAW(ICON_MOD_WARP);
-						break;
-					case eModifierType_Skin:
-						ICON_DRAW(ICON_MOD_SKIN);
-						break;
-					case eModifierType_Triangulate:
-						ICON_DRAW(ICON_MOD_TRIANGULATE);
-						break;
-					case eModifierType_MeshCache:
-						ICON_DRAW(ICON_MOD_MESHDEFORM); /* XXX, needs own icon */
-						break;
-					case eModifierType_MeshSequenceCache:
-						ICON_DRAW(ICON_MOD_MESHDEFORM); /* XXX, needs own icon */
-						break;
-					case eModifierType_Wireframe:
-						ICON_DRAW(ICON_MOD_WIREFRAME);
-						break;
-					case eModifierType_LaplacianDeform:
-						ICON_DRAW(ICON_MOD_MESHDEFORM); /* XXX, needs own icon */
-						break;
-					case eModifierType_DataTransfer:
-						ICON_DRAW(ICON_MOD_DATA_TRANSFER);
-						break;
-					case eModifierType_NormalEdit:
-						ICON_DRAW(ICON_MOD_NORMALEDIT);
-						break;
-					/* Default */
-					case eModifierType_None:
-					case eModifierType_ShapeKey:
-					case NUM_MODIFIER_TYPES:
-						ICON_DRAW(ICON_DOT);
-						break;
+				if (ob->type != OB_GPENCIL) {
+					ModifierData *md = BLI_findlink(&ob->modifiers, tselem->nr);
+					switch ((ModifierType)md->type) {
+						case eModifierType_Subsurf:
+							ICON_DRAW(ICON_MOD_SUBSURF);
+							break;
+						case eModifierType_Armature:
+							ICON_DRAW(ICON_MOD_ARMATURE);
+							break;
+						case eModifierType_Lattice:
+							ICON_DRAW(ICON_MOD_LATTICE);
+							break;
+						case eModifierType_Curve:
+							ICON_DRAW(ICON_MOD_CURVE);
+							break;
+						case eModifierType_Build:
+							ICON_DRAW(ICON_MOD_BUILD);
+							break;
+						case eModifierType_Mirror:
+							ICON_DRAW(ICON_MOD_MIRROR);
+							break;
+						case eModifierType_Decimate:
+							ICON_DRAW(ICON_MOD_DECIM);
+							break;
+						case eModifierType_Wave:
+							ICON_DRAW(ICON_MOD_WAVE);
+							break;
+						case eModifierType_Hook:
+							ICON_DRAW(ICON_HOOK);
+							break;
+						case eModifierType_Softbody:
+							ICON_DRAW(ICON_MOD_SOFT);
+							break;
+						case eModifierType_Boolean:
+							ICON_DRAW(ICON_MOD_BOOLEAN);
+							break;
+						case eModifierType_ParticleSystem:
+							ICON_DRAW(ICON_MOD_PARTICLES);
+							break;
+						case eModifierType_ParticleInstance:
+							ICON_DRAW(ICON_MOD_PARTICLES);
+							break;
+						case eModifierType_EdgeSplit:
+							ICON_DRAW(ICON_MOD_EDGESPLIT);
+							break;
+						case eModifierType_Array:
+							ICON_DRAW(ICON_MOD_ARRAY);
+							break;
+						case eModifierType_UVProject:
+						case eModifierType_UVWarp:  /* TODO, get own icon */
+							ICON_DRAW(ICON_MOD_UVPROJECT);
+							break;
+						case eModifierType_Displace:
+							ICON_DRAW(ICON_MOD_DISPLACE);
+							break;
+						case eModifierType_Shrinkwrap:
+							ICON_DRAW(ICON_MOD_SHRINKWRAP);
+							break;
+						case eModifierType_Cast:
+							ICON_DRAW(ICON_MOD_CAST);
+							break;
+						case eModifierType_MeshDeform:
+						case eModifierType_SurfaceDeform:
+							ICON_DRAW(ICON_MOD_MESHDEFORM);
+							break;
+						case eModifierType_Bevel:
+							ICON_DRAW(ICON_MOD_BEVEL);
+							break;
+						case eModifierType_Smooth:
+						case eModifierType_LaplacianSmooth:
+						case eModifierType_CorrectiveSmooth:
+							ICON_DRAW(ICON_MOD_SMOOTH);
+							break;
+						case eModifierType_SimpleDeform:
+							ICON_DRAW(ICON_MOD_SIMPLEDEFORM);
+							break;
+						case eModifierType_Mask:
+							ICON_DRAW(ICON_MOD_MASK);
+							break;
+						case eModifierType_Cloth:
+							ICON_DRAW(ICON_MOD_CLOTH);
+							break;
+						case eModifierType_Explode:
+							ICON_DRAW(ICON_MOD_EXPLODE);
+							break;
+						case eModifierType_Collision:
+						case eModifierType_Surface:
+							ICON_DRAW(ICON_MOD_PHYSICS);
+							break;
+						case eModifierType_Fluidsim:
+							ICON_DRAW(ICON_MOD_FLUIDSIM);
+							break;
+						case eModifierType_Multires:
+							ICON_DRAW(ICON_MOD_MULTIRES);
+							break;
+						case eModifierType_Smoke:
+							ICON_DRAW(ICON_MOD_SMOKE);
+							break;
+						case eModifierType_Solidify:
+							ICON_DRAW(ICON_MOD_SOLIDIFY);
+							break;
+						case eModifierType_Screw:
+							ICON_DRAW(ICON_MOD_SCREW);
+							break;
+						case eModifierType_Remesh:
+							ICON_DRAW(ICON_MOD_REMESH);
+							break;
+						case eModifierType_WeightVGEdit:
+						case eModifierType_WeightVGMix:
+						case eModifierType_WeightVGProximity:
+							ICON_DRAW(ICON_MOD_VERTEX_WEIGHT);
+							break;
+						case eModifierType_DynamicPaint:
+							ICON_DRAW(ICON_MOD_DYNAMICPAINT);
+							break;
+						case eModifierType_Ocean:
+							ICON_DRAW(ICON_MOD_OCEAN);
+							break;
+						case eModifierType_Warp:
+							ICON_DRAW(ICON_MOD_WARP);
+							break;
+						case eModifierType_Skin:
+							ICON_DRAW(ICON_MOD_SKIN);
+							break;
+						case eModifierType_Triangulate:
+							ICON_DRAW(ICON_MOD_TRIANGULATE);
+							break;
+						case eModifierType_MeshCache:
+							ICON_DRAW(ICON_MOD_MESHDEFORM); /* XXX, needs own icon */
+							break;
+						case eModifierType_MeshSequenceCache:
+							ICON_DRAW(ICON_MOD_MESHDEFORM); /* XXX, needs own icon */
+							break;
+						case eModifierType_Wireframe:
+							ICON_DRAW(ICON_MOD_WIREFRAME);
+							break;
+						case eModifierType_LaplacianDeform:
+							ICON_DRAW(ICON_MOD_MESHDEFORM); /* XXX, needs own icon */
+							break;
+						case eModifierType_DataTransfer:
+							ICON_DRAW(ICON_MOD_DATA_TRANSFER);
+							break;
+						case eModifierType_NormalEdit:
+							ICON_DRAW(ICON_MOD_NORMALEDIT);
+							break;
+							/* Default */
+						case eModifierType_None:
+						case eModifierType_ShapeKey:
+
+						case NUM_MODIFIER_TYPES:
+							ICON_DRAW(ICON_DOT);
+							break;
+					}
+				}
+				else {
+					/* grease pencil modifiers */
+					GpencilModifierData *md = BLI_findlink(&ob->greasepencil_modifiers, tselem->nr);
+					switch ((GpencilModifierType)md->type) {
+						case eGpencilModifierType_Noise:
+							ICON_DRAW(ICON_RNDCURVE);
+							break;
+						case eGpencilModifierType_Subdiv:
+							ICON_DRAW(ICON_MOD_SUBSURF);
+							break;
+						case eGpencilModifierType_Thick:
+							ICON_DRAW(ICON_MAN_ROT);
+							break;
+						case eGpencilModifierType_Tint:
+							ICON_DRAW(ICON_COLOR);
+							break;
+						case eGpencilModifierType_Instance:
+							ICON_DRAW(ICON_MOD_ARRAY);
+							break;
+						case eGpencilModifierType_Build:
+							ICON_DRAW(ICON_MOD_BUILD);
+							break;
+						case eGpencilModifierType_Opacity:
+							ICON_DRAW(ICON_MOD_MASK);
+							break;
+						case eGpencilModifierType_Color:
+							ICON_DRAW(ICON_GROUP_VCOL);
+							break;
+						case eGpencilModifierType_Lattice:
+							ICON_DRAW(ICON_MOD_LATTICE);
+							break;
+						case eGpencilModifierType_Mirror:
+							ICON_DRAW(ICON_MOD_MIRROR);
+							break;
+						case eGpencilModifierType_Simplify:
+							ICON_DRAW(ICON_MOD_DECIM);
+							break;
+						case eGpencilModifierType_Smooth:
+							ICON_DRAW(ICON_MOD_SMOOTH);
+							break;
+						case eGpencilModifierType_Hook:
+							ICON_DRAW(ICON_HOOK);
+							break;
+						case eGpencilModifierType_Offset:
+							ICON_DRAW(ICON_MOD_DISPLACE);
+							break;
+
+							/* Default */
+						default:
+							ICON_DRAW(ICON_DOT);
+							break;
+					}
 				}
 				break;
 			}
@@ -1185,11 +1214,18 @@ static void tselem_draw_icon(
 				ICON_DRAW(ICON_GROUP);
 				break;
 			/* Removed the icons from outliner. Need a better structure with Layers, Palettes and Colors */
-#if 0
 			case TSE_GP_LAYER:
-				tselem_draw_gp_icon_uibut(&arg, tselem->id, te->directdata);
+			{
+				/* indicate whether layer is active */
+				bGPDlayer *gpl = te->directdata;
+				if (gpl->flag & GP_LAYER_ACTIVE) {
+					ICON_DRAW(ICON_GREASEPENCIL);
+				}
+				else {
+					ICON_DRAW(ICON_DOT);
+				}
 				break;
-#endif
+			}
 			default:
 				ICON_DRAW(ICON_DOT);
 				break;
@@ -1229,6 +1265,9 @@ static void tselem_draw_icon(
 						ICON_CLICK_DRAW(ICON_OUTLINER_OB_EMPTY);
 					}
 					break;
+				case OB_GPENCIL:
+					ICON_CLICK_DRAW(ICON_OUTLINER_OB_GREASEPENCIL); break;
+					break;
 			}
 		}
 		else {
@@ -1304,7 +1343,7 @@ static void tselem_draw_icon(
 				case ID_LS:
 					tselem_draw_icon_uibut(&arg, ICON_LINE_DATA); break;
 				case ID_GD:
-					tselem_draw_icon_uibut(&arg, ICON_GREASEPENCIL); break;
+					tselem_draw_icon_uibut(&arg, ICON_OUTLINER_DATA_GREASEPENCIL); break;
 				case ID_LP:
 				{
 					LightProbe * lp = (LightProbe *)tselem->id;