GPencil: New Dots gradient

This commit adds support for drawing Dots strokes with a gradient factor to get artistic effects like watercolor.

Currently, the option is only supported by Dots materials, and in the future will be added to line strokes, but now there is a limitation on drawing engine and we will keep disabled on Line materials.

Also, added the option to align Dots and Boxes strokes textures aligned with the drawing path to get more fluid strokes.

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/draw/engines/gpencil/gpencil_engine.h b/source/blender/draw/engines/gpencil/gpencil_engine.h
index 8af74ec7451..5d0d2397f8d 100644
--- a/source/blender/draw/engines/gpencil/gpencil_engine.h
+++ b/source/blender/draw/engines/gpencil/gpencil_engine.h
@@ -119,6 +119,10 @@ typedef struct GPENCIL_shgroup {
 	int caps_mode[2];
 	float obj_scale;
 	int xray_mode;
+	int use_follow_path;
+
+	float gradient_f;
+	float gradient_s[2];
 
 	/* color of the wireframe */
 	float wire_color[4];
@@ -164,6 +168,10 @@ typedef struct GPENCIL_Storage {
 	bool simplify_fx;
 	bool simplify_blend;
 
+	float gradient_f;
+	float gradient_s[2];
+	int use_follow_path;
+
 	/* Render Matrices and data */
 	float persmat[4][4], persinv[4][4];
 	float viewmat[4][4], viewinv[4][4];
@@ -334,6 +342,7 @@ typedef struct GpencilBatchCacheElem {
 	uint color_id;
 	uint thickness_id;
 	uint uvdata_id;
+	uint prev_pos_id;
 
 	/* size for VBO alloc */
 	int tot_vertex;