GPencil: New Dots gradient
authorAntonioya <blendergit@gmail.com>
Mon, 15 Apr 2019 08:32:06 +0000 (10:32 +0200)
committerAntonioya <blendergit@gmail.com>
Mon, 15 Apr 2019 08:32:25 +0000 (10:32 +0200)
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.

24 files changed:
release/scripts/startup/bl_ui/properties_material_gpencil.py
release/scripts/startup/bl_ui/space_view3d_toolbar.py
source/blender/blenkernel/intern/brush.c
source/blender/blenkernel/intern/gpencil.c
source/blender/blenloader/intern/versioning_280.c
source/blender/draw/engines/gpencil/gpencil_draw_cache_impl.c
source/blender/draw/engines/gpencil/gpencil_draw_utils.c
source/blender/draw/engines/gpencil/gpencil_engine.h
source/blender/draw/engines/gpencil/shaders/gpencil_point_frag.glsl
source/blender/draw/engines/gpencil/shaders/gpencil_point_geom.glsl
source/blender/draw/engines/gpencil/shaders/gpencil_point_vert.glsl
source/blender/draw/engines/gpencil/shaders/gpencil_stroke_frag.glsl
source/blender/editors/gpencil/annotate_paint.c
source/blender/editors/gpencil/gpencil_fill.c
source/blender/editors/gpencil/gpencil_merge.c
source/blender/editors/gpencil/gpencil_paint.c
source/blender/editors/gpencil/gpencil_primitive.c
source/blender/editors/space_view3d/view3d_gizmo_ruler.c
source/blender/makesdna/DNA_brush_types.h
source/blender/makesdna/DNA_gpencil_types.h
source/blender/makesdna/DNA_material_types.h
source/blender/makesrna/intern/rna_brush.c
source/blender/makesrna/intern/rna_gpencil.c
source/blender/makesrna/intern/rna_material.c

index 24ba786..8cb59ce 100644 (file)
@@ -148,6 +148,9 @@ class MATERIAL_PT_gpencil_strokecolor(GPMaterialButtonsPanel, Panel):
             if gpcolor.stroke_style == 'SOLID' or gpcolor.use_stroke_pattern is True:
                 col.prop(gpcolor, "color", text="Color")
 
+            if gpcolor.mode in {'DOTS', 'BOX'}:
+                col.prop(gpcolor, "use_follow_path", text="Follow Drawing Path")
+
 
 class MATERIAL_PT_gpencil_fillcolor(GPMaterialButtonsPanel, Panel):
     bl_label = "Fill"
index 17dd35d..7c1fa0f 100644 (file)
@@ -1716,9 +1716,9 @@ class VIEW3D_PT_tools_grease_pencil_brush_option(View3DPanel, Panel):
         layout.use_property_decorate = False
 
         brush = context.tool_settings.gpencil_paint.brush
-        gp_settings = brush.gpencil_settings
 
         if brush is not None:
+            gp_settings = brush.gpencil_settings
             col = layout.column(align=True)
             col.prop(gp_settings, "input_samples")
             col.separator()
@@ -1728,7 +1728,20 @@ class VIEW3D_PT_tools_grease_pencil_brush_option(View3DPanel, Panel):
 
             col.prop(gp_settings, "angle", slider=True)
             col.prop(gp_settings, "angle_factor", text="Factor", slider=True)
+
+            ob = context.object
+            if ob:
+                ma = ob.active_material
+                    
+            if brush.gpencil_settings.material:
+                ma = brush.gpencil_settings.material
+
             col.separator()
+            subcol = col.column(align=True)
+            if ma and ma.grease_pencil.mode != 'DOTS':
+                subcol.enabled = False
+            subcol.prop(gp_settings, "gradient_factor", slider=True)
+            subcol.prop(gp_settings, "gradient_shape")
 
 
 class VIEW3D_PT_tools_grease_pencil_brush_stabilizer(View3DPanel, Panel):
index ea5605d..e0bc914 100644 (file)
@@ -304,6 +304,10 @@ void BKE_brush_gpencil_presets(bContext *C)
        brush->smooth_stroke_radius = SMOOTH_STROKE_RADIUS;
        brush->smooth_stroke_factor = SMOOTH_STROKE_FACTOR;
 
+       brush->gpencil_settings->gradient_f = 1.0f;
+       brush->gpencil_settings->gradient_s[0] = 1.0f;
+       brush->gpencil_settings->gradient_s[1] = 1.0f;
+
        /* Pen brush */
        brush = BKE_brush_add_gpencil(bmain, ts, "Draw Pen");
        deft = brush; /* save default brush */
@@ -336,6 +340,10 @@ void BKE_brush_gpencil_presets(bContext *C)
        brush->smooth_stroke_radius = SMOOTH_STROKE_RADIUS;
        brush->smooth_stroke_factor = SMOOTH_STROKE_FACTOR;
 
+       brush->gpencil_settings->gradient_f = 1.0f;
+       brush->gpencil_settings->gradient_s[0] = 1.0f;
+       brush->gpencil_settings->gradient_s[1] = 1.0f;
+
        /* Ink brush */
        brush = BKE_brush_add_gpencil(bmain, ts, "Draw Ink");
        brush->size = 60.0f;
@@ -365,6 +373,10 @@ void BKE_brush_gpencil_presets(bContext *C)
        brush->smooth_stroke_radius = SMOOTH_STROKE_RADIUS;
        brush->smooth_stroke_factor = SMOOTH_STROKE_FACTOR;
 
+       brush->gpencil_settings->gradient_f = 1.0f;
+       brush->gpencil_settings->gradient_s[0] = 1.0f;
+       brush->gpencil_settings->gradient_s[1] = 1.0f;
+
        /* Curve */
        custom_curve = brush->gpencil_settings->curve_sensitivity;
        curvemapping_set_defaults(custom_curve, 0, 0.0f, 0.0f, 1.0f, 1.0f);
@@ -408,6 +420,10 @@ void BKE_brush_gpencil_presets(bContext *C)
        curvemapping_initialize(custom_curve);
        brush_gpencil_curvemap_reset(custom_curve->cm, 3, GPCURVE_PRESET_INKNOISE);
 
+       brush->gpencil_settings->gradient_f = 1.0f;
+       brush->gpencil_settings->gradient_s[0] = 1.0f;
+       brush->gpencil_settings->gradient_s[1] = 1.0f;
+
        /* Block Basic brush */
        brush = BKE_brush_add_gpencil(bmain, ts, "Draw Block");
        brush->size = 150.0f;
@@ -436,6 +452,10 @@ void BKE_brush_gpencil_presets(bContext *C)
        brush->smooth_stroke_radius = SMOOTH_STROKE_RADIUS;
        brush->smooth_stroke_factor = SMOOTH_STROKE_FACTOR;
 
+       brush->gpencil_settings->gradient_f = 1.0f;
+       brush->gpencil_settings->gradient_s[0] = 1.0f;
+       brush->gpencil_settings->gradient_s[1] = 1.0f;
+
        /* Marker brush */
        brush = BKE_brush_add_gpencil(bmain, ts, "Draw Marker");
        brush->size = 80.0f;
@@ -472,6 +492,10 @@ void BKE_brush_gpencil_presets(bContext *C)
        curvemapping_initialize(custom_curve);
        brush_gpencil_curvemap_reset(custom_curve->cm, 4, GPCURVE_PRESET_MARKER);
 
+       brush->gpencil_settings->gradient_f = 1.0f;
+       brush->gpencil_settings->gradient_s[0] = 1.0f;
+       brush->gpencil_settings->gradient_s[1] = 1.0f;
+
        /* Fill brush */
        brush = BKE_brush_add_gpencil(bmain, ts, "Fill Area");
        brush->size = 1.0f;
@@ -495,6 +519,10 @@ void BKE_brush_gpencil_presets(bContext *C)
 
        brush->gpencil_settings->draw_strength = 1.0f;
 
+       brush->gpencil_settings->gradient_f = 1.0f;
+       brush->gpencil_settings->gradient_s[0] = 1.0f;
+       brush->gpencil_settings->gradient_s[1] = 1.0f;
+
        /* Soft Eraser brush */
        brush = BKE_brush_add_gpencil(bmain, ts, "Eraser Soft");
        brush->size = 30.0f;
index c204a81..d47b3f2 100644 (file)
@@ -467,6 +467,10 @@ bGPDstroke *BKE_gpencil_add_stroke(bGPDframe *gpf, int mat_idx, int totpoints, s
        bGPDstroke *gps = MEM_callocN(sizeof(bGPDstroke), "gp_stroke");
 
        gps->thickness = thickness;
+       gps->gradient_f = 1.0f;
+       gps->gradient_s[0] = 1.0f;
+       gps->gradient_s[1] = 1.0f;
+
        gps->inittime = 0;
 
        /* enable recalculation flag by default */
index ce2345b..41b1627 100644 (file)
@@ -3110,6 +3110,33 @@ void blo_do_versions_280(FileData *fd, Library *UNUSED(lib), Main *bmain)
                                }
                        }
                }
+
+               /* init grease pencil brush gradients */
+               if (!DNA_struct_elem_find(fd->filesdna, "BrushGpencilSettings", "float", "gradient_f")) {
+                       for (Brush *brush = bmain->brushes.first; brush; brush = brush->id.next) {
+                               if (brush->gpencil_settings != NULL) {
+                                       BrushGpencilSettings *gp = brush->gpencil_settings;
+                                       gp->gradient_f = 1.0f;
+                                       gp->gradient_s[0] = 1.0f;
+                                       gp->gradient_s[1] = 1.0f;
+                               }
+                       }
+               }
+
+               /* init grease pencil stroke gradients */
+               if (!DNA_struct_elem_find(fd->filesdna, "bGPDstroke", "float", "gradient_f")) {
+                       for (bGPdata *gpd = bmain->gpencils.first; gpd; gpd = gpd->id.next) {
+                               for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+                                       for (bGPDframe *gpf = gpl->frames.first; gpf; gpf = gpf->next) {
+                                               for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {
+                                                       gps->gradient_f = 1.0f;
+                                                       gps->gradient_s[0] = 1.0f;
+                                                       gps->gradient_s[1] = 1.0f;
+                                               }
+                                       }
+                               }
+                       }
+               }
        }
 
        {
index b72a6eb..3bcc963 100644 (file)
@@ -95,6 +95,7 @@ void DRW_gpencil_get_point_geom(GpencilBatchCacheElem *be, bGPDstroke *gps, shor
                be->color_id = GPU_vertformat_attr_add(&be->format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
                be->thickness_id = GPU_vertformat_attr_add(&be->format, "thickness", GPU_COMP_F32, 1, GPU_FETCH_FLOAT);
                be->uvdata_id = GPU_vertformat_attr_add(&be->format, "uvdata", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
+               be->prev_pos_id = GPU_vertformat_attr_add(&be->format, "prev_pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
 
                be->vbo = GPU_vertbuf_create_with_format(&be->format);
                GPU_vertbuf_data_alloc(be->vbo, be->tot_vertex);
@@ -123,6 +124,26 @@ void DRW_gpencil_get_point_geom(GpencilBatchCacheElem *be, bGPDstroke *gps, shor
                GPU_vertbuf_attr_set(be->vbo, be->uvdata_id, be->vbo_len, uvdata);
 
                GPU_vertbuf_attr_set(be->vbo, be->pos_id, be->vbo_len, &pt->x);
+
+               /* use previous point to determine stroke direction */
+               bGPDspoint *pt2 = NULL;
+               if (i == 0) {
+                       if (gps->totpoints > 1) {
+                               /* extrapolate a point before first point */
+                               float fpt[3];
+                               pt2 = &gps->points[1];
+                               interp_v3_v3v3(fpt, &pt2->x, &pt->x, 1.5f);
+                               GPU_vertbuf_attr_set(be->vbo, be->prev_pos_id, be->vbo_len, fpt);
+                       }
+                       else {
+                               GPU_vertbuf_attr_set(be->vbo, be->prev_pos_id, be->vbo_len, &pt->x);
+                       }
+               }
+               else {
+                       pt2 = &gps->points[i - 1];
+                       GPU_vertbuf_attr_set(be->vbo, be->prev_pos_id, be->vbo_len, &pt2->x);
+               }
+
                be->vbo_len++;
        }
 }
index 6aefd2a..8ecee86 100644 (file)
@@ -532,6 +532,10 @@ DRWShadingGroup *DRW_gpencil_shgroup_stroke_create(
                stl->shgroups[id].caps_mode[1] = gps->caps[1];
                DRW_shgroup_uniform_int(grp, "caps_mode", &stl->shgroups[id].caps_mode[0], 2);
 
+               stl->shgroups[id].gradient_f = gps->gradient_f;
+               copy_v2_v2(stl->shgroups[id].gradient_s, gps->gradient_s);
+               DRW_shgroup_uniform_float(grp, "gradient_f", &stl->shgroups[id].gradient_f, 1);
+
                /* viewport x-ray */
                stl->shgroups[id].is_xray = (ob->dt == OB_WIRE) ? 1 : stl->storage->is_xray;
                DRW_shgroup_uniform_int(grp, "viewport_xray", (const int *)&stl->shgroups[id].is_xray, 1);
@@ -565,6 +569,8 @@ DRWShadingGroup *DRW_gpencil_shgroup_stroke_create(
                const int zero[2] = { 0, 0 };
                DRW_shgroup_uniform_int(grp, "caps_mode", &zero[0], 2);
 
+               DRW_shgroup_uniform_float(grp, "gradient_f", &stl->storage->gradient_f, 1);
+
                /* viewport x-ray */
                DRW_shgroup_uniform_int(grp, "viewport_xray", &stl->storage->is_xray, 1);
                DRW_shgroup_uniform_int(grp, "shading_type", (const int *)&stl->storage->shade_render, 2);
@@ -611,7 +617,7 @@ DRWShadingGroup *DRW_gpencil_shgroup_stroke_create(
 /* create shading group for points */
 static DRWShadingGroup *DRW_gpencil_shgroup_point_create(
         GPENCIL_e_data *e_data, GPENCIL_Data *vedata, DRWPass *pass, GPUShader *shader, Object *ob,
-        bGPdata *gpd, bGPDlayer *gpl,
+        bGPdata *gpd, bGPDlayer *gpl, bGPDstroke *gps,
         MaterialGPencilStyle *gp_style, int id, bool onion,
         const float scale, const int shading_type[2])
 {
@@ -651,6 +657,11 @@ static DRWShadingGroup *DRW_gpencil_shgroup_point_create(
                DRW_shgroup_uniform_int(grp, "mode", &stl->shgroups[id].mode, 1);
                DRW_shgroup_uniform_float(grp, "pixfactor", &gpd->pixfactor, 1);
 
+               stl->shgroups[id].gradient_f = gps->gradient_f;
+               copy_v2_v2(stl->shgroups[id].gradient_s, gps->gradient_s);
+               DRW_shgroup_uniform_float(grp, "gradient_f", &stl->shgroups[id].gradient_f, 1);
+               DRW_shgroup_uniform_vec2(grp, "gradient_s", stl->shgroups[id].gradient_s, 1);
+
                /* viewport x-ray */
                stl->shgroups[id].is_xray = (ob->dt == OB_WIRE) ? 1 : stl->storage->is_xray;
                DRW_shgroup_uniform_int(grp, "viewport_xray", (const int *)&stl->shgroups[id].is_xray, 1);
@@ -684,6 +695,10 @@ static DRWShadingGroup *DRW_gpencil_shgroup_point_create(
                else {
                        DRW_shgroup_uniform_float(grp, "pixfactor", &stl->storage->pixfactor, 1);
                }
+
+               DRW_shgroup_uniform_float(grp, "gradient_f", &stl->storage->gradient_f, 1);
+               DRW_shgroup_uniform_vec2(grp, "gradient_s", stl->storage->gradient_s, 1);
+
                /* viewport x-ray */
                stl->shgroups[id].is_xray = ((ob) && (ob->dt == OB_WIRE)) ? 1 : stl->storage->is_xray;
                DRW_shgroup_uniform_int(grp, "viewport_xray", (const int *)&stl->shgroups[id].is_xray, 1);
@@ -693,12 +708,21 @@ static DRWShadingGroup *DRW_gpencil_shgroup_point_create(
        if ((gpd) && (id > -1)) {
                stl->shgroups[id].xray_mode = (ob->dtx & OB_DRAWXRAY) ? GP_XRAY_FRONT : GP_XRAY_3DSPACE;
                DRW_shgroup_uniform_int(grp, "xraymode", (const int *)&stl->shgroups[id].xray_mode, 1);
+
+               /* lock rotation of dots and boxes */
+               stl->shgroups[id].use_follow_path = (gp_style->flag & GP_STYLE_COLOR_LOCK_DOTS) ? 0 : 1;
+               DRW_shgroup_uniform_int(grp, "use_follow_path", &stl->shgroups[id].use_follow_path, 1);
        }
        else {
                /* for drawing always on predefined z-depth */
                DRW_shgroup_uniform_int(grp, "xraymode", &stl->storage->xray, 1);
+
+               /* lock rotation of dots and boxes */
+               DRW_shgroup_uniform_int(grp, "use_follow_path", &stl->storage->use_follow_path, 1);
        }
 
+
+
        /* image texture */
        if ((gp_style) && (gp_style->stroke_style == GP_STYLE_STROKE_STYLE_TEXTURE) && (!onion)) {
                ImBuf *ibuf;
@@ -1374,6 +1398,12 @@ void DRW_gpencil_populate_buffer_strokes(GPENCIL_e_data *e_data, void *vedata, T
                         * i.e. tGPspoints NOT bGPDspoints
                         */
                        short lthick = brush->size * obscale;
+
+                       /* save gradient info */
+                       stl->storage->gradient_f = brush->gpencil_settings->gradient_f;
+                       copy_v2_v2(stl->storage->gradient_s, brush->gpencil_settings->gradient_s);
+                       stl->storage->use_follow_path = (gp_style->flag & GP_STYLE_COLOR_LOCK_DOTS) ? 0 : 1;
+
                        /* if only one point, don't need to draw buffer because the user has no time to see it */
                        if (gpd->runtime.sbuffer_size > 1) {
                                if ((gp_style) && (gp_style->mode == GP_STYLE_MODE_LINE)) {
@@ -1385,7 +1415,7 @@ void DRW_gpencil_populate_buffer_strokes(GPENCIL_e_data *e_data, void *vedata, T
                                else {
                                        stl->g_data->shgrps_drawing_stroke = DRW_gpencil_shgroup_point_create(
                                                e_data, vedata, psl->drawing_pass, e_data->gpencil_point_sh, NULL,
-                                               gpd, NULL, gp_style, -1,
+                                               gpd, NULL, NULL, gp_style, -1,
                                                false, 1.0f, (const int *)stl->storage->shade_render);
                                }
 
@@ -1582,7 +1612,7 @@ static void DRW_gpencil_shgroups_create(
 
                                shgrp = DRW_gpencil_shgroup_point_create(
                                        e_data, vedata, stroke_pass, e_data->gpencil_point_sh,
-                                       ob, gpd, gpl, gp_style, stl->storage->shgroup_id, elm->onion,
+                                       ob, gpd, gpl, gps, gp_style, stl->storage->shgroup_id, elm->onion,
                                        scale, cache_ob->shading_type);
 
                                DRW_shgroup_call_range_add(
index 8af74ec..5d0d239 100644 (file)
@@ -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;
index a128502..ca8c888 100644 (file)
@@ -2,6 +2,9 @@ uniform int color_type;
 uniform int mode;
 uniform sampler2D myTexture;
 
+uniform float gradient_f;
+uniform vec2 gradient_s;
+
 in vec4 mColor;
 in vec2 mTexCoord;
 out vec4 fragColor;
@@ -17,15 +20,23 @@ out vec4 fragColor;
 #define GPENCIL_COLOR_TEXTURE 1
 #define GPENCIL_COLOR_PATTERN 2
 
+/* Function to check the point inside ellipse */
+float checkpoint(vec2 pt, vec2 radius) 
+{ 
+    float p = (pow(pt.x, 2) / pow(radius.x, 2)) + (pow(pt.y, 2) / pow(radius.y, 2)); 
+  
+    return p; 
+} 
+
 void main()
 {
        vec2 centered = mTexCoord - vec2(0.5);
-       float dist_squared = dot(centered, centered);
-       const float rad_squared = 0.25;
+       float ellip = checkpoint(centered, vec2(gradient_s / 2.0));
 
-        /* Round point with jaggy edges. */
-       if ((mode != GPENCIL_MODE_BOX) && (dist_squared > rad_squared)) {
-               discard;
+       if (mode != GPENCIL_MODE_BOX) {
+               if (ellip > 1.0) {
+                       discard;
+               }
        }
 
        vec4 tmp_color = texture2D(myTexture, mTexCoord);
@@ -47,6 +58,15 @@ void main()
                /* mult both alpha factor to use strength factor with color alpha limit */
                fragColor.a = min(text_color.a * mColor.a, mColor.a);
        }
-       if(fragColor.a < 0.0035)
+       
+       if ((mode == GPENCIL_MODE_DOTS) && (gradient_f < 1.0)) {
+               float dist = length(centered) * 2;
+               float decay = dist * (1.0 - gradient_f) * fragColor.a;
+               fragColor.a = clamp(fragColor.a - decay, 0.0, 1.0);
+               fragColor.a = fragColor.a * (1.0 - ellip);
+       }
+       
+       if(fragColor.a < 0.0035) {
                discard;
+       }
 }
index 6c22633..32aaa05 100644 (file)
@@ -1,6 +1,7 @@
 uniform mat4 ModelViewProjectionMatrix;
 uniform vec2 Viewport;
 uniform int xraymode;
+uniform int use_follow_path;
 
 layout(points) in;
 layout(triangle_strip, max_vertices = 4) out;
@@ -8,6 +9,7 @@ layout(triangle_strip, max_vertices = 4) out;
 in vec4 finalColor[1];
 in float finalThickness[1];
 in vec2 finaluvdata[1];
+in vec4 finalprev_pos[1];
 
 out vec4 mColor;
 out vec2 mTexCoord;
@@ -15,6 +17,10 @@ out vec2 mTexCoord;
 #define GP_XRAY_FRONT 0
 #define GP_XRAY_3DSPACE 1
 
+#define M_PI        3.14159265358979323846  /* pi */
+#define M_2PI       6.28318530717958647692  /* 2*pi */
+#define FALSE       0
+
 /* project 3d point to 2d on screen space */
 vec2 toScreenSpace(vec4 vertex)
 {
@@ -45,33 +51,89 @@ vec2 rotateUV(vec2 uv, float angle)
        return rot_uv + vec2(0.5f, 0.5f);
 }
 
+vec2 rotatePoint(vec2 center, vec2 point, float angle)
+{
+       /* translate center of rotation to the center */
+       vec2 new_point = point - center;
+       vec2 rot_point;
+       rot_point.x = new_point.x * cos(angle) - new_point.y * sin(angle);
+       rot_point.y = new_point.y * cos(angle) + new_point.x * sin(angle);
+       return rot_point + center;
+}
+
+/* Calculate angle of the stroke using previous point as reference.
+ * The angle is calculated using the x axis (1, 0) as 0 degrees */
+float getAngle(vec2 pt0, vec2 pt1)
+{
+       /* do not rotate one point only (no reference to rotate) */
+       if (pt0 == pt1) {
+               return 0.0;
+       }       
+
+       if (use_follow_path == FALSE) {
+               return 0.0;
+       }
+
+       /* default horizontal line (x-axis) in screen space */
+       vec2 v0 = vec2(1.0, 0.0);
+       
+       /* vector of direction */
+       vec2 vn = vec2(normalize(pt1 - pt0));
+       
+       /* angle signed (function ported from angle_signed_v2v2) */
+       float perp_dot = (v0[1] * vn[0]) - (v0[0] * vn[1]);
+       float angle = atan(perp_dot, dot(v0, vn));
+       
+       /* get full circle rotation */
+       if (angle > 0.0) {
+               angle = M_PI + (M_PI - angle);
+       }
+       else {
+               angle *= -1.0;
+       }
+
+       return angle;
+}
+
 void main(void)
 {
-       /* receive points */
+       /* receive points */
        vec4 P0 = gl_in[0].gl_Position;
        vec2 sp0 = toScreenSpace(P0);
 
+       vec4 P1 = finalprev_pos[0];
+       vec2 sp1 = toScreenSpace(P1);
+    vec2 point;
+
        float size = finalThickness[0];
-       float aspect = 1.0;
+       vec2 center = vec2(sp0.x, sp0.y);
+       
+       /* get angle of stroke to rotate texture */
+       float angle = getAngle(sp0, sp1);
+
        /* generate the triangle strip */
        mTexCoord = rotateUV(vec2(0, 1), finaluvdata[0].y);
        mColor = finalColor[0];
-       gl_Position = vec4(vec2(sp0.x - size, sp0.y + size * aspect) / Viewport, getZdepth(P0), 1.0);
+       point = rotatePoint(center, vec2(sp0.x - size, sp0.y + size), angle);
+       gl_Position = vec4(point / Viewport, getZdepth(P0), 1.0);
        EmitVertex();
 
        mTexCoord = rotateUV(vec2(0, 0), finaluvdata[0].y);
        mColor = finalColor[0];
-       gl_Position = vec4(vec2(sp0.x - size, sp0.y - size * aspect) / Viewport, getZdepth(P0), 1.0);
+       point = rotatePoint(center, vec2(sp0.x - size, sp0.y - size), angle);
+       gl_Position = vec4(point / Viewport, getZdepth(P0), 1.0);
        EmitVertex();
 
        mTexCoord = rotateUV(vec2(1, 1), finaluvdata[0].y);
        mColor = finalColor[0];
-       gl_Position = vec4(vec2(sp0.x + size, sp0.y + size * aspect) / Viewport, getZdepth(P0), 1.0);
+       point = rotatePoint(center, vec2(sp0.x + size, sp0.y + size), angle);
+       gl_Position = vec4(point / Viewport, getZdepth(P0), 1.0);
        EmitVertex();
 
        mTexCoord = rotateUV(vec2(1, 0), finaluvdata[0].y);
        mColor = finalColor[0];
-       gl_Position = vec4(vec2(sp0.x + size, sp0.y - size * aspect) / Viewport, getZdepth(P0), 1.0);
+       point = rotatePoint(center, vec2(sp0.x + size, sp0.y - size), angle);
+       gl_Position = vec4(point / Viewport, getZdepth(P0), 1.0);
        EmitVertex();
 
        EndPrimitive();
index 2606bbf..7deca54 100644 (file)
@@ -13,10 +13,12 @@ in vec3 pos;
 in vec4 color;
 in float thickness;
 in vec2 uvdata;
+in vec3 prev_pos;
 
 out vec4 finalColor;
 out float finalThickness;
 out vec2 finaluvdata;
+out vec4 finalprev_pos;
 
 #define TRUE 1
 
@@ -30,7 +32,8 @@ float defaultpixsize = pixsize * (1000.0 / pixfactor);
 
 void main()
 {
-       gl_Position = ModelViewProjectionMatrix * vec4( pos, 1.0 );
+       gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
+       finalprev_pos = ModelViewProjectionMatrix * vec4(prev_pos, 1.0);
        finalColor = color;
 
        if (keep_size == TRUE) {
index 80fa899..a49a6e8 100644 (file)
@@ -1,6 +1,8 @@
 uniform int color_type;
 uniform sampler2D myTexture;
 
+uniform float gradient_f;
+
 in vec4 mColor;
 in vec2 mTexCoord;
 in vec2 uvfac;
@@ -18,6 +20,7 @@ out vec4 fragColor;
 
 void main()
 {
+       
        vec4 tColor = vec4(mColor);
        /* if uvfac[1]  == 1, then encap */
        if (uvfac[1] == ENDCAP) {
@@ -54,6 +57,16 @@ void main()
                fragColor.a = min(text_color.a * tColor.a, tColor.a);
        }
 
+       /* gradient */
+       /* keep this disabled while the line glitch bug exists
+       if (gradient_f < 1.0) {
+               float d = abs(mTexCoord.y - 0.5)  * (1.1 - gradient_f);
+               float alpha = 1.0 - clamp((fragColor.a - (d * 2.0)), 0.03, 1.0);
+               fragColor.a = smoothstep(fragColor.a, 0.0, alpha);
+               
+       }
+       */
+
        if(fragColor.a < 0.0035)
                discard;
 }
index 5152bcb..dcecd87 100644 (file)
@@ -681,6 +681,9 @@ static void gp_stroke_newfrombuffer(tGPsdata *p)
        /* copy appropriate settings for stroke */
        gps->totpoints = totelem;
        gps->thickness = gpl->thickness;
+       gps->gradient_f = 1.0f;
+       gps->gradient_s[0] = 1.0f;
+       gps->gradient_s[1] = 1.0f;
        gps->flag = gpd->runtime.sbuffer_sflag;
        gps->inittime = p->inittime;
 
index e13dfb3..76d1555 100644 (file)
@@ -1011,6 +1011,8 @@ static void gpencil_stroke_from_buffer(tGPDfill *tgpf)
        /* create new stroke */
        bGPDstroke *gps = MEM_callocN(sizeof(bGPDstroke), "bGPDstroke");
        gps->thickness = brush->size;
+       gps->gradient_f = brush->gpencil_settings->gradient_f;
+       copy_v2_v2(gps->gradient_s, brush->gpencil_settings->gradient_s);
        gps->inittime = 0.0f;
 
        /* the polygon must be closed, so enabled cyclic */
index 80b26a3..10bf45a 100644 (file)
@@ -127,6 +127,8 @@ static bGPDstroke *gpencil_prepare_stroke(bContext *C, wmOperator *op, int totpo
        gps->totpoints = totpoints;
        gps->inittime = 0.0f;
        gps->thickness = brush->size;
+       gps->gradient_f = brush->gpencil_settings->gradient_f;
+       copy_v2_v2(gps->gradient_s, brush->gpencil_settings->gradient_s);
        gps->flag |= GP_STROKE_SELECT;
        gps->flag |= GP_STROKE_3DSPACE;
        gps->mat_nr = ob->actcol - 1;
index daea24e..aadaff5 100644 (file)
@@ -944,6 +944,8 @@ static void gp_stroke_newfrombuffer(tGPsdata *p)
        /* copy appropriate settings for stroke */
        gps->totpoints = totelem;
        gps->thickness = brush->size;
+       gps->gradient_f = brush->gpencil_settings->gradient_f;
+       copy_v2_v2(gps->gradient_s, brush->gpencil_settings->gradient_s);
        gps->flag = gpd->runtime.sbuffer_sflag;
        gps->inittime = p->inittime;
 
index f923985..374dbbf 100644 (file)
@@ -319,6 +319,9 @@ static void gp_primitive_set_initdata(bContext *C, tGPDprimitive *tgpi)
        /* create new temp stroke */
        bGPDstroke *gps = MEM_callocN(sizeof(bGPDstroke), "Temp bGPDstroke");
        gps->thickness = 2.0f;
+       gps->gradient_f = 1.0f;
+       gps->gradient_s[0] = 1.0f;
+       gps->gradient_s[1] = 1.0f;
        gps->inittime = 0.0f;
 
        /* enable recalculation flag by default */
@@ -1199,6 +1202,7 @@ static void gpencil_primitive_interaction_end(bContext *C, wmOperator *op, wmWin
        bGPDstroke *gps;
 
        ToolSettings *ts = tgpi->scene->toolsettings;
+       Brush *brush = tgpi->brush;
 
        const int def_nr = tgpi->ob->actdef - 1;
        const bool have_weight = (bool)BLI_findlink(&tgpi->ob->defbase, def_nr);
@@ -1221,7 +1225,10 @@ static void gpencil_primitive_interaction_end(bContext *C, wmOperator *op, wmWin
        /* prepare stroke to get transferred */
        gps = tgpi->gpf->strokes.first;
        if (gps) {
-               gps->thickness = tgpi->brush->size;
+               gps->thickness = brush->size;
+               gps->gradient_f = brush->gpencil_settings->gradient_f;
+               copy_v2_v2(gps->gradient_s, brush->gpencil_settings->gradient_s);
+
                gps->flag |= GP_STROKE_RECALC_GEOMETRY;
                gps->tot_triangles = 0;
 
index f8f92d8..253e02c 100644 (file)
@@ -437,6 +437,9 @@ static bool view3d_ruler_to_gpencil(bContext *C, wmGizmoGroup *gzgroup)
                }
                gps->flag = GP_STROKE_3DSPACE;
                gps->thickness = 3;
+               gps->gradient_f = 1.0f;
+               gps->gradient_s[0] = 1.0f;
+               gps->gradient_s[1] = 1.0f;
 
                BLI_addtail(&gpf->strokes, gps);
                changed = true;
index 4bfbb36..9aa6ff8 100644 (file)
@@ -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;
index 56e17fe..dc752cc 100644 (file)
@@ -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;
index 3db8bf9..a8f3384 100644 (file)
@@ -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 {
index ce5b183..23ae314 100644 (file)
@@ -1197,6 +1197,25 @@ static void rna_def_gpencil_options(BlenderRNA *brna)
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, NULL);
 
+       /* gradient control */
+       prop = RNA_def_property(srna, "gradient_factor", PROP_FLOAT, PROP_FACTOR);
+       RNA_def_property_float_sdna(prop, NULL, "gradient_f");
+       RNA_def_property_range(prop, 0.001f, 1.0f);
+       RNA_def_property_float_default(prop, 1.0f);
+       RNA_def_property_ui_text(
+               prop, "Border Opacity Factor",
+               "Amount of gradient for Dot strokes (set to 1 for full solid)");
+       RNA_def_parameter_clear_flags(prop, PROP_ANIMATABLE, 0);
+
+       /* gradient shape ratio */
+       prop = RNA_def_property(srna, "gradient_shape", PROP_FLOAT, PROP_XYZ);
+       RNA_def_property_float_sdna(prop, NULL, "gradient_s");
+       RNA_def_property_array(prop, 2);
+       RNA_def_property_range(prop, 0.01f, 1.0f);
+       RNA_def_property_float_default(prop, 1.0f);
+       RNA_def_property_ui_text(prop, "Aspect Ratio", "");
+       RNA_def_parameter_clear_flags(prop, PROP_ANIMATABLE, 0);
+
        prop = RNA_def_property(srna, "input_samples", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "input_samples");
        RNA_def_property_range(prop, 0, GP_MAX_INPUT_SAMPLES);
index 73203be..d154f8d 100644 (file)
@@ -998,6 +998,24 @@ static void rna_def_gpencil_stroke(BlenderRNA *brna)
        RNA_def_property_ui_text(prop, "Thickness", "Thickness of stroke (in pixels)");
        RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, "rna_GPencil_update");
 
+       /* gradient control along y */
+       prop = RNA_def_property(srna, "gradient_factor", PROP_FLOAT, PROP_FACTOR);
+       RNA_def_property_float_sdna(prop, NULL, "gradient_f");
+       RNA_def_property_range(prop, 0.001f, 1.0f);
+       RNA_def_property_float_default(prop, 1.0f);
+       RNA_def_property_ui_text(prop, "Border Opacity Factor",
+               "Amount of gradient along section of stroke");
+       RNA_def_parameter_clear_flags(prop, PROP_ANIMATABLE, 0);
+       RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, "rna_GPencil_update");
+
+       /* gradient shape ratio */
+       prop = RNA_def_property(srna, "gradient_shape", PROP_FLOAT, PROP_XYZ);
+       RNA_def_property_float_sdna(prop, NULL, "gradient_s");
+       RNA_def_property_array(prop, 2);
+       RNA_def_property_range(prop, 0.01f, 1.0f);
+       RNA_def_property_float_default(prop, 1.0f);
+       RNA_def_property_ui_text(prop, "Aspect Ratio", "");
+       RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, "rna_GPencil_update");
 }
 
 static void rna_def_gpencil_strokes_api(BlenderRNA *brna, PropertyRNA *cprop)
index 8e5f486..a57f47a 100644 (file)
@@ -585,6 +585,13 @@ static void rna_def_material_greasepencil(BlenderRNA *brna)
        RNA_def_property_ui_text(prop, "Show Fill", "Show stroke fills of this material");
        RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialGpencil_update");
 
+       /* keep Dots and Boxes aligned to screen and not to drawing path */
+       prop = RNA_def_property(srna, "use_follow_path", PROP_BOOLEAN, PROP_NONE);
+       RNA_def_property_boolean_negative_sdna(prop, NULL, "flag", GP_STYLE_COLOR_LOCK_DOTS);
+       RNA_def_property_ui_text(prop, "Follow Path",
+               "Keep Dots and Boxes aligned to drawing path");
+       RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialGpencil_nopreview_update");
+
        /* pass index for future compositing and editing tools */
        prop = RNA_def_property(srna, "pass_index", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_int_sdna(prop, NULL, "index");