blender-archive/source/blender/gpencil_modifiers/intern/MOD_gpencilthick.c

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2017, Blender Foundation
 * This is a new part of Blender
 */

/** \file
 * \ingroup modifiers
 */

#include <stdio.h>

#include "BLI_listbase.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"

#include "DNA_defaults.h"
#include "DNA_gpencil_modifier_types.h"
#include "DNA_gpencil_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"
#include "DNA_screen_types.h"

#include "BKE_colortools.h"
#include "BKE_context.h"
#include "BKE_deform.h"
#include "BKE_gpencil_modifier.h"
#include "BKE_lib_query.h"
#include "BKE_modifier.h"
#include "BKE_screen.h"

#include "DEG_depsgraph.h"
#include "DEG_depsgraph_build.h"
#include "DEG_depsgraph_query.h"

#include "UI_interface.h"
#include "UI_resources.h"

#include "RNA_access.h"

#include "MOD_gpencil_modifiertypes.h"
#include "MOD_gpencil_ui_common.h"
#include "MOD_gpencil_util.h"

static void initData(GpencilModifierData *md)
{
  ThickGpencilModifierData *gpmd = (ThickGpencilModifierData *)md;

  BLI_assert(MEMCMP_STRUCT_AFTER_IS_ZERO(gpmd, modifier));

  MEMCPY_STRUCT_AFTER(gpmd, DNA_struct_default_get(ThickGpencilModifierData), modifier);

  gpmd->curve_thickness = BKE_curvemapping_add(1, 0.0f, 0.0f, 1.0f, 1.0f);
  BKE_curvemapping_init(gpmd->curve_thickness);
}

static void freeData(GpencilModifierData *md)
{
  ThickGpencilModifierData *gpmd = (ThickGpencilModifierData *)md;

  if (gpmd->curve_thickness) {
    BKE_curvemapping_free(gpmd->curve_thickness);
  }
}

static void copyData(const GpencilModifierData *md, GpencilModifierData *target)
{
  ThickGpencilModifierData *gmd = (ThickGpencilModifierData *)md;
  ThickGpencilModifierData *tgmd = (ThickGpencilModifierData *)target;

  if (tgmd->curve_thickness != NULL) {
    BKE_curvemapping_free(tgmd->curve_thickness);
    tgmd->curve_thickness = NULL;
  }

  BKE_gpencil_modifier_copydata_generic(md, target);

  tgmd->curve_thickness = BKE_curvemapping_copy(gmd->curve_thickness);
}

/* change stroke thickness */
static void deformStroke(GpencilModifierData *md,
                         Depsgraph *UNUSED(depsgraph),
                         Object *ob,
                         bGPDlayer *gpl,
                         bGPDframe *UNUSED(gpf),
                         bGPDstroke *gps)
{
  ThickGpencilModifierData *mmd = (ThickGpencilModifierData *)md;
  const int def_nr = BKE_object_defgroup_name_index(ob, mmd->vgname);

  if (!is_stroke_affected_by_modifier(ob,
                                      mmd->layername,
                                      mmd->material,
                                      mmd->pass_index,
                                      mmd->layer_pass,
                                      1,
                                      gpl,
                                      gps,
                                      mmd->flag & GP_THICK_INVERT_LAYER,
                                      mmd->flag & GP_THICK_INVERT_PASS,
                                      mmd->flag & GP_THICK_INVERT_LAYERPASS,
                                      mmd->flag & GP_THICK_INVERT_MATERIAL)) {
    return;
  }

  float stroke_thickness_inv = 1.0f / max_ii(gps->thickness, 1);

  for (int i = 0; i < gps->totpoints; i++) {
    bGPDspoint *pt = &gps->points[i];
    MDeformVert *dvert = gps->dvert != NULL ? &gps->dvert[i] : NULL;
    /* Verify point is part of vertex group. */
    float weight = get_modifier_point_weight(
        dvert, (mmd->flag & GP_THICK_INVERT_VGROUP) != 0, def_nr);
    if (weight < 0.0f) {
      continue;
    }

    float curvef = 1.0f;

    float factor_depth = 1.0f;

    if (mmd->flag & GP_THICK_FADING) {
      if (mmd->object) {
        float gvert[3];
        mul_v3_m4v3(gvert, ob->obmat, &pt->x);
        float dist = len_v3v3(mmd->object->obmat[3], gvert);
        float fading_max = MAX2(mmd->fading_start, mmd->fading_end);
        float fading_min = MIN2(mmd->fading_start, mmd->fading_end);

        /* Better with ratiof() function from line art. */
        if (dist > fading_max) {
          factor_depth = 0.0f;
        }
        else if (dist <= fading_max && dist > fading_min) {
          factor_depth = (fading_max - dist) / (fading_max - fading_min);
        }
        else {
          factor_depth = 1.0f;
        }
      }
    }

    if ((mmd->flag & GP_THICK_CUSTOM_CURVE) && (mmd->curve_thickness)) {
      /* Normalize value to evaluate curve. */
      float value = (float)i / (gps->totpoints - 1);
      curvef = BKE_curvemapping_evaluateF(mmd->curve_thickness, 0, value);
    }

    float target;
    if (mmd->flag & GP_THICK_NORMALIZE) {
      target = mmd->thickness * stroke_thickness_inv;
      target *= curvef;
    }
    else {
      target = pt->pressure * mmd->thickness_fac;
      weight *= curvef;
    }

    /* Apply distance fading. */
    if (mmd->flag & GP_THICK_FADING) {
      target = interpf(target, mmd->fading_end_factor, factor_depth);
    }

    pt->pressure = interpf(target, pt->pressure, weight);

    CLAMP_MIN(pt->pressure, 0.0f);
  }
}

static void bakeModifier(struct Main *UNUSED(bmain),
                         Depsgraph *depsgraph,
                         GpencilModifierData *md,
                         Object *ob)
{
  bGPdata *gpd = ob->data;

  LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {
    LISTBASE_FOREACH (bGPDframe *, gpf, &gpl->frames) {
      LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
        deformStroke(md, depsgraph, ob, gpl, gpf, gps);
      }
    }
  }
}

static void foreachIDLink(GpencilModifierData *md, Object *ob, IDWalkFunc walk, void *userData)
{
  ThickGpencilModifierData *mmd = (ThickGpencilModifierData *)md;

  walk(userData, ob, (ID **)&mmd->material, IDWALK_CB_USER);
  walk(userData, ob, (ID **)&mmd->object, IDWALK_CB_NOP);
}

static void updateDepsgraph(GpencilModifierData *md,
                            const ModifierUpdateDepsgraphContext *ctx,
                            const int UNUSED(mode))
{
  ThickGpencilModifierData *mmd = (ThickGpencilModifierData *)md;
  if (mmd->object != NULL) {
    DEG_add_object_relation(ctx->node, mmd->object, DEG_OB_COMP_TRANSFORM, "Thickness Modifier");
  }
  DEG_add_object_relation(ctx->node, ctx->object, DEG_OB_COMP_TRANSFORM, "Thickness Modifier");
}

static void fading_header_draw(const bContext *UNUSED(C), Panel *panel)
{
  uiLayout *layout = panel->layout;

  PointerRNA *ptr = gpencil_modifier_panel_get_property_pointers(panel, NULL);

  uiItemR(layout, ptr, "use_fading", 0, NULL, ICON_NONE);
}

static void fading_panel_draw(const bContext *C, Panel *panel)
{
  gpencil_modifier_fading_draw(C, panel);
}

static void panel_draw(const bContext *UNUSED(C), Panel *panel)
{
  uiLayout *layout = panel->layout;

  PointerRNA *ptr = gpencil_modifier_panel_get_property_pointers(panel, NULL);

  uiLayoutSetPropSep(layout, true);

  uiItemR(layout, ptr, "normalize_thickness", 0, NULL, ICON_NONE);

  if (RNA_boolean_get(ptr, "normalize_thickness")) {
    uiItemR(layout, ptr, "thickness", 0, NULL, ICON_NONE);
  }
  else {
    uiItemR(layout, ptr, "thickness_factor", 0, NULL, ICON_NONE);
  }

  gpencil_modifier_panel_end(layout, ptr);
}

static void mask_panel_draw(const bContext *UNUSED(C), Panel *panel)
{
  gpencil_modifier_masking_panel_draw(panel, true, true);
}

static void panelRegister(ARegionType *region_type)
{
  PanelType *panel_type = gpencil_modifier_panel_register(
      region_type, eGpencilModifierType_Thick, panel_draw);
  gpencil_modifier_subpanel_register(
      region_type, "fading", "", fading_header_draw, fading_panel_draw, panel_type);
  PanelType *mask_panel_type = gpencil_modifier_subpanel_register(
      region_type, "mask", "Influence", NULL, mask_panel_draw, panel_type);
  gpencil_modifier_subpanel_register(region_type,
                                     "curve",
                                     "",
                                     gpencil_modifier_curve_header_draw,
                                     gpencil_modifier_curve_panel_draw,
                                     mask_panel_type);
}

GpencilModifierTypeInfo modifierType_Gpencil_Thick = {
    /* name */ "Thickness",
    /* structName */ "ThickGpencilModifierData",
    /* structSize */ sizeof(ThickGpencilModifierData),
    /* type */ eGpencilModifierTypeType_Gpencil,
    /* flags */ eGpencilModifierTypeFlag_SupportsEditmode,

    /* copyData */ copyData,

    /* deformStroke */ deformStroke,
    /* generateStrokes */ NULL,
    /* bakeModifier */ bakeModifier,
    /* remapTime */ NULL,

    /* initData */ initData,
    /* freeData */ freeData,
    /* isDisabled */ NULL,
    /* updateDepsgraph */ updateDepsgraph,
    /* dependsOnTime */ NULL,
    /* foreachIDLink */ foreachIDLink,
    /* foreachTexLink */ NULL,
    /* panelRegister */ panelRegister,
};