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/*
* 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) 2008, Blender Foundation
* This is a new part of Blender
*/
/** \file
* \ingroup edgpencil
*/
#include <float.h>
#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "MEM_guardedalloc.h"
#include "BLI_sys_types.h"
#include "BLI_math.h"
#include "BLI_polyfill_2d.h"
#include "BLI_utildefines.h"
#include "BLF_api.h"
#include "BLT_translation.h"
#include "DNA_brush_types.h"
#include "DNA_gpencil_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "DNA_userdef_types.h"
#include "DNA_view3d_types.h"
#include "BKE_brush.h"
#include "BKE_context.h"
#include "BKE_global.h"
#include "BKE_gpencil.h"
#include "BKE_image.h"
#include "BKE_material.h"
#include "BKE_paint.h"
#include "DEG_depsgraph.h"
#include "WM_api.h"
#include "BIF_glutil.h"
#include "GPU_immediate.h"
#include "GPU_state.h"
#include "ED_gpencil.h"
#include "ED_screen.h"
#include "ED_space_api.h"
#include "ED_view3d.h"
#include "UI_interface_icons.h"
#include "UI_resources.h"
#include "IMB_imbuf_types.h"
#include "gpencil_intern.h"
/* ************************************************** */
/* GREASE PENCIL DRAWING */
/* ----- General Defines ------ */
/* flags for sflag */
typedef enum eDrawStrokeFlags {
/** don't draw status info */
GP_DRAWDATA_NOSTATUS = (1 << 0),
/** only draw 3d-strokes */
GP_DRAWDATA_ONLY3D = (1 << 1),
/** only draw 'canvas' strokes */
GP_DRAWDATA_ONLYV2D = (1 << 2),
/** only draw 'image' strokes */
GP_DRAWDATA_ONLYI2D = (1 << 3),
/** special hack for drawing strokes in Image Editor (weird coordinates) */
GP_DRAWDATA_IEDITHACK = (1 << 4),
/** don't draw xray in 3D view (which is default) */
GP_DRAWDATA_NO_XRAY = (1 << 5),
/** no onionskins should be drawn (for animation playback) */
GP_DRAWDATA_NO_ONIONS = (1 << 6),
/** draw strokes as "volumetric" circular billboards */
GP_DRAWDATA_VOLUMETRIC = (1 << 7),
/** fill insides/bounded-regions of strokes */
GP_DRAWDATA_FILL = (1 << 8),
} eDrawStrokeFlags;
/* thickness above which we should use special drawing */
#if 0
# define GP_DRAWTHICKNESS_SPECIAL 3
#endif
/* conversion utility (float --> normalized unsigned byte) */
#define F2UB(x) (uchar)(255.0f * x)
/* ----- Tool Buffer Drawing ------ */
/* helper functions to set color of buffer point */
static void gp_set_point_varying_color(const bGPDspoint *pt,
const float ink[4],
uint attr_id,
bool fix_strength)
{
float alpha = ink[3] * pt->strength;
if ((fix_strength) && (alpha >= 0.1f)) {
alpha = 1.0f;
}
CLAMP(alpha, GPENCIL_STRENGTH_MIN, 1.0f);
immAttr4ub(attr_id, F2UB(ink[0]), F2UB(ink[1]), F2UB(ink[2]), F2UB(alpha));
}
/* ----------- Volumetric Strokes --------------- */
/* draw a 3D stroke in "volumetric" style */
static void gp_draw_stroke_volumetric_3d(const bGPDspoint *points,
int totpoints,
short thickness,
const float ink[4])
{
GPUVertFormat *format = immVertexFormat();
uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
uint size = GPU_vertformat_attr_add(format, "size", GPU_COMP_F32, 1, GPU_FETCH_FLOAT);
uint color = GPU_vertformat_attr_add(
format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
immBindBuiltinProgram(GPU_SHADER_3D_POINT_VARYING_SIZE_VARYING_COLOR);
GPU_program_point_size(true);
immBegin(GPU_PRIM_POINTS, totpoints);
const bGPDspoint *pt = points;
for (int i = 0; i < totpoints && pt; i++, pt++) {
gp_set_point_varying_color(pt, ink, color, false);
/* TODO: scale based on view transform */
immAttr1f(size, pt->pressure * thickness);
/* we can adjust size in vertex shader based on view/projection! */
immVertex3fv(pos, &pt->x);
}
immEnd();
immUnbindProgram();
GPU_program_point_size(false);
}
/* ----- Existing Strokes Drawing (3D and Point) ------ */
/* draw a given stroke in 3d (i.e. in 3d-space) */
static void gp_draw_stroke_3d(tGPDdraw *tgpw, short thickness, const float ink[4], bool cyclic)
{
bGPDspoint *points = tgpw->gps->points;
int totpoints = tgpw->gps->totpoints;
const float viewport[2] = {(float)tgpw->winx, (float)tgpw->winy};
float curpressure = points[0].pressure;
float fpt[3];
/* if cyclic needs more vertex */
int cyclic_add = (cyclic) ? 1 : 0;
GPUVertFormat *format = immVertexFormat();
const struct {
uint pos, color, thickness;
} attr_id = {
.pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT),
.color = GPU_vertformat_attr_add(
format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT),
.thickness = GPU_vertformat_attr_add(format, "thickness", GPU_COMP_F32, 1, GPU_FETCH_FLOAT),
};
immBindBuiltinProgram(GPU_SHADER_GPENCIL_STROKE);
immUniform2fv("Viewport", viewport);
immUniform1f("pixsize", tgpw->rv3d->pixsize);
float obj_scale = tgpw->ob ?
(tgpw->ob->scale[0] + tgpw->ob->scale[1] + tgpw->ob->scale[2]) / 3.0f :
1.0f;
immUniform1f("objscale", obj_scale);
int keep_size = (int)((tgpw->gpd) && (tgpw->gpd->flag & GP_DATA_STROKE_KEEPTHICKNESS));
immUniform1i("keep_size", keep_size);
immUniform1f("pixfactor", tgpw->gpd->pixfactor);
/* xray mode always to 3D space to avoid wrong zdepth calculation (T60051) */
immUniform1i("xraymode", GP_XRAY_3DSPACE);
immUniform1i("caps_start", (int)tgpw->gps->caps[0]);
immUniform1i("caps_end", (int)tgpw->gps->caps[1]);
immUniform1i("fill_stroke", (int)tgpw->is_fill_stroke);
/* draw stroke curve */
GPU_line_width(max_ff(curpressure * thickness, 1.0f));
immBeginAtMost(GPU_PRIM_LINE_STRIP_ADJ, totpoints + cyclic_add + 2);
const bGPDspoint *pt = points;
for (int i = 0; i < totpoints; i++, pt++) {
/* first point for adjacency (not drawn) */
if (i == 0) {
gp_set_point_varying_color(points, ink, attr_id.color, (bool)tgpw->is_fill_stroke);
if ((cyclic) && (totpoints > 2)) {
immAttr1f(attr_id.thickness, max_ff((points + totpoints - 1)->pressure * thickness, 1.0f));
mul_v3_m4v3(fpt, tgpw->diff_mat, &(points + totpoints - 1)->x);
}
else {
immAttr1f(attr_id.thickness, max_ff((points + 1)->pressure * thickness, 1.0f));
mul_v3_m4v3(fpt, tgpw->diff_mat, &(points + 1)->x);
}
immVertex3fv(attr_id.pos, fpt);
}
/* set point */
gp_set_point_varying_color(pt, ink, attr_id.color, (bool)tgpw->is_fill_stroke);
immAttr1f(attr_id.thickness, max_ff(pt->pressure * thickness, 1.0f));
mul_v3_m4v3(fpt, tgpw->diff_mat, &pt->x);
immVertex3fv(attr_id.pos, fpt);
}
if (cyclic && totpoints > 2) {
/* draw line to first point to complete the cycle */
immAttr1f(attr_id.thickness, max_ff(points->pressure * thickness, 1.0f));
mul_v3_m4v3(fpt, tgpw->diff_mat, &points->x);
immVertex3fv(attr_id.pos, fpt);
/* now add adjacency point (not drawn) */
immAttr1f(attr_id.thickness, max_ff((points + 1)->pressure * thickness, 1.0f));
mul_v3_m4v3(fpt, tgpw->diff_mat, &(points + 1)->x);
immVertex3fv(attr_id.pos, fpt);
}
/* last adjacency point (not drawn) */
else {
gp_set_point_varying_color(
points + totpoints - 2, ink, attr_id.color, (bool)tgpw->is_fill_stroke);
immAttr1f(attr_id.thickness, max_ff((points + totpoints - 2)->pressure * thickness, 1.0f));
mul_v3_m4v3(fpt, tgpw->diff_mat, &(points + totpoints - 2)->x);
immVertex3fv(attr_id.pos, fpt);
}
immEnd();
immUnbindProgram();
}
/* ----- Strokes Drawing ------ */
/* Helper for doing all the checks on whether a stroke can be drawn */
static bool gp_can_draw_stroke(const bGPDstroke *gps, const int dflag)
{
/* skip stroke if it isn't in the right display space for this drawing context */
/* 1) 3D Strokes */
if ((dflag & GP_DRAWDATA_ONLY3D) && !(gps->flag & GP_STROKE_3DSPACE)) {
return false;
}
if (!(dflag & GP_DRAWDATA_ONLY3D) && (gps->flag & GP_STROKE_3DSPACE)) {
return false;
}
/* 2) Screen Space 2D Strokes */
if ((dflag & GP_DRAWDATA_ONLYV2D) && !(gps->flag & GP_STROKE_2DSPACE)) {
return false;
}
if (!(dflag & GP_DRAWDATA_ONLYV2D) && (gps->flag & GP_STROKE_2DSPACE)) {
return false;
}
/* 3) Image Space (2D) */
if ((dflag & GP_DRAWDATA_ONLYI2D) && !(gps->flag & GP_STROKE_2DIMAGE)) {
return false;
}
if (!(dflag & GP_DRAWDATA_ONLYI2D) && (gps->flag & GP_STROKE_2DIMAGE)) {
return false;
}
/* skip stroke if it doesn't have any valid data */
if ((gps->points == NULL) || (gps->totpoints < 1)) {
return false;
}
/* stroke can be drawn */
return true;
}
/* draw a set of strokes */
static void gp_draw_strokes(tGPDdraw *tgpw)
{
float tcolor[4];
short sthickness;
float ink[4];
const bool is_unique = (tgpw->gps != NULL);
const bool use_mat = (tgpw->gpd->mat != NULL);
GPU_program_point_size(true);
bGPDstroke *gps_init = (tgpw->gps) ? tgpw->gps : tgpw->t_gpf->strokes.first;
for (bGPDstroke *gps = gps_init; gps; gps = gps->next) {
/* check if stroke can be drawn */
if (gp_can_draw_stroke(gps, tgpw->dflag) == false) {
continue;
}
/* check if the color is visible */
Material *ma = (use_mat) ? tgpw->gpd->mat[gps->mat_nr] : BKE_material_default_gpencil();
MaterialGPencilStyle *gp_style = (ma) ? ma->gp_style : NULL;
if ((gp_style == NULL) || (gp_style->flag & GP_MATERIAL_HIDE) ||
/* if onion and ghost flag do not draw*/
(tgpw->onion && (gp_style->flag & GP_MATERIAL_HIDE_ONIONSKIN))) {
continue;
}
/* if disable fill, the colors with fill must be omitted too except fill boundary strokes */
if ((tgpw->disable_fill == 1) && (gp_style->fill_rgba[3] > 0.0f) &&
((gps->flag & GP_STROKE_NOFILL) == 0) && (gp_style->flag & GP_MATERIAL_FILL_SHOW)) {
continue;
}
/* calculate thickness */
sthickness = gps->thickness + tgpw->lthick;
if (tgpw->is_fill_stroke) {
sthickness = (short)max_ii(1, sthickness / 2);
}
if (sthickness <= 0) {
continue;
}
/* check which stroke-drawer to use */
if (tgpw->dflag & GP_DRAWDATA_ONLY3D) {
const int no_xray = (tgpw->dflag & GP_DRAWDATA_NO_XRAY);
int mask_orig = 0;
if (no_xray) {
glGetIntegerv(GL_DEPTH_WRITEMASK, &mask_orig);
glDepthMask(0);
GPU_depth_test(true);
/* first arg is normally rv3d->dist, but this isn't
* available here and seems to work quite well without */
bglPolygonOffset(1.0f, 1.0f);
}
/* 3D Stroke */
/* set color using material tint color and opacity */
if (!tgpw->onion) {
interp_v3_v3v3(tcolor, gp_style->stroke_rgba, tgpw->tintcolor, tgpw->tintcolor[3]);
tcolor[3] = gp_style->stroke_rgba[3] * tgpw->opacity;
copy_v4_v4(ink, tcolor);
}
else {
if (tgpw->custonion) {
copy_v4_v4(ink, tgpw->tintcolor);
}
else {
ARRAY_SET_ITEMS(tcolor, UNPACK3(gp_style->stroke_rgba), tgpw->opacity);
copy_v4_v4(ink, tcolor);
}
}
/* if used for fill, set opacity to 1 */
if (tgpw->is_fill_stroke) {
if (ink[3] >= GPENCIL_ALPHA_OPACITY_THRESH) {
ink[3] = 1.0f;
}
}
if (gp_style->mode == GP_MATERIAL_MODE_DOT) {
/* volumetric stroke drawing */
if (tgpw->disable_fill != 1) {
gp_draw_stroke_volumetric_3d(gps->points, gps->totpoints, sthickness, ink);
}
}
else {
/* 3D Lines - OpenGL primitives-based */
if (gps->totpoints > 1) {
tgpw->gps = gps;
gp_draw_stroke_3d(tgpw, sthickness, ink, gps->flag & GP_STROKE_CYCLIC);
}
}
if (no_xray) {
glDepthMask(mask_orig);
GPU_depth_test(false);
bglPolygonOffset(0.0, 0.0);
}
}
/* if only one stroke, exit from loop */
if (is_unique) {
break;
}
}
GPU_program_point_size(false);
}
/* ----- General Drawing ------ */
/* wrapper to draw strokes for filling operator */
void ED_gp_draw_fill(tGPDdraw *tgpw)
{
gp_draw_strokes(tgpw);
}
|