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.

3 files changed, 14 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_brush_types.h b/source/blender/makesdna/DNA_brush_types.h
index 4bfbb3655af..9aa6ff8c1c8 100644
--- a/source/blender/makesdna/DNA_brush_types.h
+++ b/source/blender/makesdna/DNA_brush_types.h
@@ -111,6 +111,12 @@ typedef struct BrushGpencilSettings {
 	/** Internal grease pencil drawing flags. */
 	int flag;
 
+	/** gradient control along y for color */
+	float gradient_f;
+	/** factor xy of shape for dots gradients */
+	float gradient_s[2];
+	char _pad_2[4];
+
 	struct CurveMapping *curve_sensitivity;
 	struct CurveMapping *curve_strength;
 	struct CurveMapping *curve_jitter;
diff --git a/source/blender/makesdna/DNA_gpencil_types.h b/source/blender/makesdna/DNA_gpencil_types.h
index 56e17fe9149..dc752cc0bc9 100644
--- a/source/blender/makesdna/DNA_gpencil_types.h
+++ b/source/blender/makesdna/DNA_gpencil_types.h
@@ -199,6 +199,12 @@ typedef struct bGPDstroke {
 	/** Caps mode for each stroke extreme */
 	short caps[2];
 
+	/** gradient control along y for color */
+	float gradient_f;
+	/** factor xy of shape for dots gradients */
+	float gradient_s[2];
+	char _pad_3[4];
+
 	/** Vertex weight data. */
 	struct MDeformVert *dvert;
 	void *_pad3;
diff --git a/source/blender/makesdna/DNA_material_types.h b/source/blender/makesdna/DNA_material_types.h
index 3db8bf92f56..a8f3384ea85 100644
--- a/source/blender/makesdna/DNA_material_types.h
+++ b/source/blender/makesdna/DNA_material_types.h
@@ -121,6 +121,8 @@ typedef enum eMaterialGPencilStyle_Flag {
 	GP_STYLE_STROKE_SHOW = (1 << 8),
 	/* Fill  show main switch */
 	GP_STYLE_FILL_SHOW = (1 << 9),
+	/* Don't rotate dots/boxes */
+	GP_STYLE_COLOR_LOCK_DOTS = (1 << 10)
 } eMaterialGPencilStyle_Flag;
 
 typedef enum eMaterialGPencilStyle_Mode {