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.

5 files changed, 34 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_vector.h b/source/blender/blenlib/BLI_math_vector.h
index ec16a6854c4..ef2ff10b5c6 100644
--- a/source/blender/blenlib/BLI_math_vector.h
+++ b/source/blender/blenlib/BLI_math_vector.h
@@ -78,6 +78,9 @@ MINLINE void zero_v3_int(int r[3]);
 MINLINE void copy_v2_v2_int(int r[2], const int a[2]);
 MINLINE void copy_v3_v3_int(int r[3], const int a[3]);
 MINLINE void copy_v4_v4_int(int r[4], const int a[4]);
+/* int <-> float */
+MINLINE void copy_v2fl_v2i(float r[2], const int a[2]);
+MINLINE void round_v2i_v2fl(int r[2], const float a[2]);
 /* double -> float */
 MINLINE void copy_v2fl_v2db(float r[2], const double a[2]);
 MINLINE void copy_v3fl_v3db(float r[3], const double a[3]);
diff --git a/source/blender/blenlib/BLI_rand.h b/source/blender/blenlib/BLI_rand.h
index 612151b7ea2..f7dea562393 100644
--- a/source/blender/blenlib/BLI_rand.h
+++ b/source/blender/blenlib/BLI_rand.h
@@ -64,6 +64,9 @@ void        BLI_rng_shuffle_array(struct RNG *rng, void *data, unsigned int elem
 /** Note that skipping is as slow as generating n numbers! */
 void        BLI_rng_skip(struct RNG *rng, int n) ATTR_NONNULL(1);
 
+/* fill an array with random numbers */
+void    BLI_array_frand(float *ar, int count, unsigned int seed);
+
 /** Return a pseudo-random (hash) float from an integer value */
 float	BLI_hash_frand(unsigned int seed) ATTR_WARN_UNUSED_RESULT;
 
diff --git a/source/blender/blenlib/intern/listbase.c b/source/blender/blenlib/intern/listbase.c
index 568448327bd..80b8a8d041c 100644
--- a/source/blender/blenlib/intern/listbase.c
+++ b/source/blender/blenlib/intern/listbase.c
@@ -578,6 +578,9 @@ void *BLI_findstring(const ListBase *listbase, const char *id, const int offset)
 	Link *link = NULL;
 	const char *id_iter;
 
+	if (id == NULL)
+		return NULL;
+
 	for (link = listbase->first; link; link = link->next) {
 		id_iter = ((const char *)link) + offset;
 
diff --git a/source/blender/blenlib/intern/math_vector_inline.c b/source/blender/blenlib/intern/math_vector_inline.c
index 189b94a6f13..c4535eacefa 100644
--- a/source/blender/blenlib/intern/math_vector_inline.c
+++ b/source/blender/blenlib/intern/math_vector_inline.c
@@ -192,6 +192,19 @@ MINLINE void copy_v4_v4_int(int r[4], const int a[4])
 	r[3] = a[3];
 }
 
+/* int <-> float */
+MINLINE void round_v2i_v2fl(int r[2], const float a[2])
+{
+	r[0] = (int)roundf(a[0]);
+	r[1] = (int)roundf(a[1]);
+}
+
+MINLINE void copy_v2fl_v2i(float r[2], const int a[2])
+{
+	r[0] = (float)a[0];
+	r[1] = (float)a[1];
+}
+
 /* double -> float */
 MINLINE void copy_v2fl_v2db(float r[2], const double a[2])
 {
diff --git a/source/blender/blenlib/intern/rand.c b/source/blender/blenlib/intern/rand.c
index 9e56ce6b2cf..8613a0ea6dd 100644
--- a/source/blender/blenlib/intern/rand.c
+++ b/source/blender/blenlib/intern/rand.c
@@ -265,6 +265,18 @@ void BLI_rng_skip(RNG *rng, int n)
 
 /***/
 
+/* fill an array with random numbers */
+void BLI_array_frand(float *ar, int count, unsigned int seed)
+{
+	RNG rng;
+
+	BLI_rng_srandom(&rng, seed);
+
+	for (int i = 0; i < count; i++) {
+		ar[i] = BLI_rng_get_float(&rng);
+	}
+}
+
 float BLI_hash_frand(unsigned int seed)
 {
 	RNG rng;