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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 blender/editors/gpencil/drawgpencil.c
* \ingroup edgpencil
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include <math.h>
#include <float.h>
#include "MEM_guardedalloc.h"
#include "BLI_sys_types.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#include "BLI_polyfill_2d.h"
#include "BLF_api.h"
#include "BLT_translation.h"
#include "DNA_gpencil_types.h"
#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "DNA_view3d_types.h"
#include "DNA_userdef_types.h"
#include "DNA_object_types.h"
#include "BKE_context.h"
#include "BKE_global.h"
#include "BKE_gpencil.h"
#include "WM_api.h"
#include "BIF_gl.h"
#include "BIF_glutil.h"
#include "ED_gpencil.h"
#include "ED_screen.h"
#include "ED_view3d.h"
#include "ED_space_api.h"
#include "UI_interface_icons.h"
#include "UI_resources.h"
/* ************************************************** */
/* GREASE PENCIL DRAWING */
/* ----- General Defines ------ */
/* flags for sflag */
typedef enum eDrawStrokeFlags {
GP_DRAWDATA_NOSTATUS = (1 << 0), /* don't draw status info */
GP_DRAWDATA_ONLY3D = (1 << 1), /* only draw 3d-strokes */
GP_DRAWDATA_ONLYV2D = (1 << 2), /* only draw 'canvas' strokes */
GP_DRAWDATA_ONLYI2D = (1 << 3), /* only draw 'image' strokes */
GP_DRAWDATA_IEDITHACK = (1 << 4), /* special hack for drawing strokes in Image Editor (weird coordinates) */
GP_DRAWDATA_NO_XRAY = (1 << 5), /* don't draw xray in 3D view (which is default) */
GP_DRAWDATA_NO_ONIONS = (1 << 6), /* no onionskins should be drawn (for animation playback) */
GP_DRAWDATA_VOLUMETRIC = (1 << 7), /* draw strokes as "volumetric" circular billboards */
GP_DRAWDATA_FILL = (1 << 8), /* fill insides/bounded-regions of strokes */
GP_DRAWDATA_HQ_FILL = (1 << 9) /* Use high quality fill */
} eDrawStrokeFlags;
/* thickness above which we should use special drawing */
#define GP_DRAWTHICKNESS_SPECIAL 3
/* ----- Tool Buffer Drawing ------ */
/* helper function to set color of buffer point */
static void gp_set_tpoint_color(tGPspoint *pt, float ink[4])
{
float alpha = ink[3] * pt->strength;
CLAMP(alpha, GPENCIL_STRENGTH_MIN, 1.0f);
glColor4f(ink[0], ink[1], ink[2], alpha);
}
/* helper function to set color of point */
static void gp_set_point_color(bGPDspoint *pt, float ink[4])
{
float alpha = ink[3] * pt->strength;
CLAMP(alpha, GPENCIL_STRENGTH_MIN, 1.0f);
glColor4f(ink[0], ink[1], ink[2], alpha);
}
/* helper function to set color and point */
static void gp_set_color_and_tpoint(tGPspoint *pt, float ink[4])
{
gp_set_tpoint_color(pt, ink);
glVertex2iv(&pt->x);
}
/* draw stroke defined in buffer (simple ogl lines/points for now, as dotted lines) */
static void gp_draw_stroke_buffer(tGPspoint *points, int totpoints, short thickness,
short dflag, short sflag, float ink[4])
{
tGPspoint *pt;
int i;
/* error checking */
if ((points == NULL) || (totpoints <= 0))
return;
/* check if buffer can be drawn */
if (dflag & (GP_DRAWDATA_ONLY3D | GP_DRAWDATA_ONLYV2D))
return;
if (totpoints == 1) {
/* if drawing a single point, draw it larger */
glPointSize((float)(thickness + 2) * points->pressure);
glBegin(GL_POINTS);
gp_set_color_and_tpoint(points, ink);
glEnd();
}
else if (sflag & GP_STROKE_ERASER) {
/* don't draw stroke at all! */
}
else {
float oldpressure = points[0].pressure;
/* draw stroke curve */
if (G.debug & G_DEBUG) setlinestyle(2);
glLineWidth(max_ff(oldpressure * thickness, 1.0));
glBegin(GL_LINE_STRIP);
for (i = 0, pt = points; i < totpoints && pt; i++, pt++) {
/* if there was a significant pressure change, stop the curve, change the thickness of the stroke,
* and continue drawing again (since line-width cannot change in middle of GL_LINE_STRIP)
*/
if (fabsf(pt->pressure - oldpressure) > 0.2f) {
glEnd();
glLineWidth(max_ff(pt->pressure * thickness, 1.0f));
glBegin(GL_LINE_STRIP);
/* need to roll-back one point to ensure that there are no gaps in the stroke */
if (i != 0) {
gp_set_color_and_tpoint((pt - 1), ink);
}
/* now the point we want... */
gp_set_color_and_tpoint(pt, ink);
oldpressure = pt->pressure;
}
else {
gp_set_color_and_tpoint(pt, ink);
}
}
glEnd();
if (G.debug & G_DEBUG) setlinestyle(0);
}
}
/* --------- 2D Stroke Drawing Helpers --------- */
/* change in parameter list */
static void gp_calc_2d_stroke_fxy(float pt[3], short sflag, int offsx, int offsy, int winx, int winy, float r_co[2])
{
if (sflag & GP_STROKE_2DSPACE) {
r_co[0] = pt[0];
r_co[1] = pt[1];
}
else if (sflag & GP_STROKE_2DIMAGE) {
const float x = (float)((pt[0] * winx) + offsx);
const float y = (float)((pt[1] * winy) + offsy);
r_co[0] = x;
r_co[1] = y;
}
else {
const float x = (float)(pt[0] / 100 * winx) + offsx;
const float y = (float)(pt[1] / 100 * winy) + offsy;
r_co[0] = x;
r_co[1] = y;
}
}
/* ----------- Volumetric Strokes --------------- */
/* draw a 2D buffer stroke in "volumetric" style
* NOTE: the stroke buffer doesn't have any coordinate offsets/transforms
*/
static void gp_draw_stroke_volumetric_buffer(tGPspoint *points, int totpoints, short thickness,
short dflag, short UNUSED(sflag), float ink[4])
{
GLUquadricObj *qobj = gluNewQuadric();
float modelview[4][4];
tGPspoint *pt;
int i;
/* error checking */
if ((points == NULL) || (totpoints <= 0))
return;
/* check if buffer can be drawn */
if (dflag & (GP_DRAWDATA_ONLY3D | GP_DRAWDATA_ONLYV2D))
return;
/* get basic matrix - should be camera space (i.e "identity") */
glGetFloatv(GL_MODELVIEW_MATRIX, (float *)modelview);
/* draw points */
glPushMatrix();
for (i = 0, pt = points; i < totpoints; i++, pt++) {
/* set the transformed position */
// TODO: scale should change based on zoom level, which requires proper translation mult too!
modelview[3][0] = pt->x;
modelview[3][1] = pt->y;
glLoadMatrixf((float *)modelview);
/* draw the disk using the current state... */
gp_set_tpoint_color(pt, ink);
gluDisk(qobj, 0.0, pt->pressure * thickness, 32, 1);
modelview[3][0] = modelview[3][1] = 0.0f;
}
glPopMatrix();
gluDeleteQuadric(qobj);
}
/* draw a 2D strokes in "volumetric" style */
static void gp_draw_stroke_volumetric_2d(bGPDspoint *points, int totpoints, short thickness,
short dflag, short sflag,
int offsx, int offsy, int winx, int winy,
float diff_mat[4][4], float ink[4])
{
GLUquadricObj *qobj = gluNewQuadric();
float modelview[4][4];
float baseloc[3];
float scalefac = 1.0f;
bGPDspoint *pt;
int i;
float fpt[3];
/* HACK: We need a scale factor for the drawing in the image editor,
* which seems to use 1 unit as it's maximum size, whereas everything
* else assumes 1 unit = 1 pixel. Otherwise, we only get a massive blob.
*/
if ((dflag & GP_DRAWDATA_IEDITHACK) && (dflag & GP_DRAWDATA_ONLYV2D)) {
scalefac = 0.001f;
}
/* get basic matrix */
glGetFloatv(GL_MODELVIEW_MATRIX, (float *)modelview);
copy_v3_v3(baseloc, modelview[3]);
/* draw points */
glPushMatrix();
for (i = 0, pt = points; i < totpoints; i++, pt++) {
/* color of point */
gp_set_point_color(pt, ink);
/* set the transformed position */
float co[2];
mul_v3_m4v3(fpt, diff_mat, &pt->x);
gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, co);
translate_m4(modelview, co[0], co[1], 0.0f);
glLoadMatrixf((float *)modelview);
/* draw the disk using the current state... */
gluDisk(qobj, 0.0, pt->pressure * thickness * scalefac, 32, 1);
/* restore matrix */
copy_v3_v3(modelview[3], baseloc);
}
glPopMatrix();
gluDeleteQuadric(qobj);
}
/* draw a 3D stroke in "volumetric" style */
static void gp_draw_stroke_volumetric_3d(
bGPDspoint *points, int totpoints, short thickness,
short UNUSED(dflag), short UNUSED(sflag), float diff_mat[4][4], float ink[4])
{
GLUquadricObj *qobj = gluNewQuadric();
float base_modelview[4][4], modelview[4][4];
float base_loc[3];
bGPDspoint *pt;
int i;
float fpt[3];
/* Get the basic modelview matrix we use for performing calculations */
glGetFloatv(GL_MODELVIEW_MATRIX, (float *)base_modelview);
copy_v3_v3(base_loc, base_modelview[3]);
/* Create the basic view-aligned billboard matrix we're going to actually draw qobj with:
* - We need to knock out the rotation so that we are
* simply left with a camera-facing billboard
* - The scale factors here are chosen so that the thickness
* is relatively reasonable. Otherwise, it gets far too
* large!
*/
scale_m4_fl(modelview, 0.1f);
/* draw each point as a disk... */
glPushMatrix();
for (i = 0, pt = points; i < totpoints && pt; i++, pt++) {
/* color of point */
gp_set_point_color(pt, ink);
mul_v3_m4v3(fpt, diff_mat, &pt->x);
/* apply translation to base_modelview, so that the translated point is put in the right place */
translate_m4(base_modelview, fpt[0], fpt[1], fpt[2]);
/* copy the translation component to the billboard matrix we're going to use,
* then reset the base matrix to the original values so that we can do the same
* for the next point without accumulation/pollution effects
*/
copy_v3_v3(modelview[3], base_modelview[3]); /* copy offset value */
copy_v3_v3(base_modelview[3], base_loc); /* restore */
/* apply our billboard matrix for drawing... */
glLoadMatrixf((float *)modelview);
/* draw the disk using the current state... */
gluDisk(qobj, 0.0, pt->pressure * thickness, 32, 1);
}
glPopMatrix();
gluDeleteQuadric(qobj);
}
/* --------------- Stroke Fills ----------------- */
/* Get points of stroke always flat to view not affected by camera view or view position */
static void gp_stroke_2d_flat(bGPDspoint *points, int totpoints, float(*points2d)[2], int *r_direction)
{
bGPDspoint *pt0 = &points[0];
bGPDspoint *pt1 = &points[1];
bGPDspoint *pt3 = &points[(int)(totpoints * 0.75)];
float locx[3];
float locy[3];
float loc3[3];
float normal[3];
/* local X axis (p0 -> p1) */
sub_v3_v3v3(locx, &pt1->x, &pt0->x);
/* point vector at 3/4 */
sub_v3_v3v3(loc3, &pt3->x, &pt0->x);
/* vector orthogonal to polygon plane */
cross_v3_v3v3(normal, locx, loc3);
/* local Y axis (cross to normal/x axis) */
cross_v3_v3v3(locy, normal, locx);
/* Normalize vectors */
normalize_v3(locx);
normalize_v3(locy);
/* Get all points in local space */
for (int i = 0; i < totpoints; i++) {
bGPDspoint *pt = &points[i];
float loc[3];
/* Get local space using first point as origin */
sub_v3_v3v3(loc, &pt->x, &pt0->x);
points2d[i][0] = dot_v3v3(loc, locx);
points2d[i][1] = dot_v3v3(loc, locy);
}
/* Concave (-1), Convex (1), or Autodetect (0)? */
*r_direction = (int)locy[2];
}
/* Triangulate stroke for high quality fill (this is done only if cache is null or stroke was modified) */
static void gp_triangulate_stroke_fill(bGPDstroke *gps)
{
BLI_assert(gps->totpoints >= 3);
/* allocate memory for temporary areas */
gps->tot_triangles = gps->totpoints - 2;
unsigned int (*tmp_triangles)[3] = MEM_mallocN(sizeof(*tmp_triangles) * gps->tot_triangles, "GP Stroke temp triangulation");
float (*points2d)[2] = MEM_mallocN(sizeof(*points2d) * gps->totpoints, "GP Stroke temp 2d points");
int direction = 0;
/* convert to 2d and triangulate */
gp_stroke_2d_flat(gps->points, gps->totpoints, points2d, &direction);
BLI_polyfill_calc(points2d, (unsigned int)gps->totpoints, direction, tmp_triangles);
/* Number of triangles */
gps->tot_triangles = gps->totpoints - 2;
/* save triangulation data in stroke cache */
if (gps->tot_triangles > 0) {
if (gps->triangles == NULL) {
gps->triangles = MEM_callocN(sizeof(*gps->triangles) * gps->tot_triangles, "GP Stroke triangulation");
}
else {
gps->triangles = MEM_recallocN(gps->triangles, sizeof(*gps->triangles) * gps->tot_triangles);
}
for (int i = 0; i < gps->tot_triangles; i++) {
bGPDtriangle *stroke_triangle = &gps->triangles[i];
memcpy(stroke_triangle->verts, tmp_triangles[i], sizeof(uint[3]));
}
}
else {
/* No triangles needed - Free anything allocated previously */
if (gps->triangles)
MEM_freeN(gps->triangles);
gps->triangles = NULL;
}
/* disable recalculation flag */
if (gps->flag & GP_STROKE_RECALC_CACHES) {
gps->flag &= ~GP_STROKE_RECALC_CACHES;
}
/* clear memory */
if (tmp_triangles) MEM_freeN(tmp_triangles);
if (points2d) MEM_freeN(points2d);
}
/* draw fills for shapes */
static void gp_draw_stroke_fill(
bGPdata *gpd, bGPDstroke *gps,
int offsx, int offsy, int winx, int winy, float diff_mat[4][4])
{
bGPDpalettecolor *palcolor;
int i;
float fpt[3];
BLI_assert(gps->totpoints >= 3);
palcolor = ED_gpencil_stroke_getcolor(gpd, gps);
/* Triangulation fill if high quality flag is enabled */
if (palcolor->flag & PC_COLOR_HQ_FILL) {
bGPDtriangle *stroke_triangle;
bGPDspoint *pt;
/* Calculate triangles cache for filling area (must be done only after changes) */
if ((gps->flag & GP_STROKE_RECALC_CACHES) || (gps->tot_triangles == 0) || (gps->triangles == NULL)) {
gp_triangulate_stroke_fill(gps);
}
/* Draw all triangles for filling the polygon (cache must be calculated before) */
BLI_assert(gps->tot_triangles >= 1);
glBegin(GL_TRIANGLES);
if (gps->flag & GP_STROKE_3DSPACE) {
for (i = 0, stroke_triangle = gps->triangles; i < gps->tot_triangles; i++, stroke_triangle++) {
for (int j = 0; j < 3; j++) {
pt = &gps->points[stroke_triangle->verts[j]];
mul_v3_m4v3(fpt, diff_mat, &pt->x);
glVertex3fv(fpt);
}
}
}
else {
for (i = 0, stroke_triangle = gps->triangles; i < gps->tot_triangles; i++, stroke_triangle++) {
for (int j = 0; j < 3; j++) {
float co[2];
pt = &gps->points[stroke_triangle->verts[j]];
mul_v3_m4v3(fpt, diff_mat, &pt->x);
gp_calc_2d_stroke_fxy(fpt, gps->flag, offsx, offsy, winx, winy, co);
glVertex2fv(co);
}
}
}
glEnd();
}
else {
/* As an initial implementation, we use the OpenGL filled polygon drawing
* here since it's the easiest option to implement for this case. It does
* come with limitations (notably for concave shapes), though it shouldn't
* be much of an issue in most cases.
*
* We keep this legacy implementation around despite now having the high quality
* fills, as this is necessary for keeping everything working nicely for files
* created using old versions of Blender which may have depended on the artifacts
* the old fills created.
*/
bGPDspoint *pt;
glBegin(GL_POLYGON);
for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
if (gps->flag & GP_STROKE_3DSPACE) {
mul_v3_m4v3(fpt, diff_mat, &pt->x);
glVertex3fv(fpt);
}
else {
float co[2];
mul_v3_m4v3(fpt, diff_mat, &pt->x);
gp_calc_2d_stroke_fxy(fpt, gps->flag, offsx, offsy, winx, winy, co);
glVertex2fv(co);
}
}
glEnd();
}
}
/* ----- Existing Strokes Drawing (3D and Point) ------ */
/* draw a given stroke - just a single dot (only one point) */
static void gp_draw_stroke_point(
bGPDspoint *points, short thickness, short dflag, short sflag,
int offsx, int offsy, int winx, int winy, float diff_mat[4][4], float ink[4])
{
float fpt[3];
bGPDspoint *pt = &points[0];
/* color of point */
gp_set_point_color(pt, ink);
/* set point thickness (since there's only one of these) */
glPointSize((float)(thickness + 2) * points->pressure);
/* get final position using parent matrix */
mul_v3_m4v3(fpt, diff_mat, &pt->x);
/* draw point */
if (sflag & GP_STROKE_3DSPACE) {
glBegin(GL_POINTS);
glVertex3fv(fpt);
glEnd();
}
else {
float co[2];
/* get coordinates of point */
gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, co);
/* if thickness is less than GP_DRAWTHICKNESS_SPECIAL, simple dot looks ok
* - also mandatory in if Image Editor 'image-based' dot
*/
if ((thickness < GP_DRAWTHICKNESS_SPECIAL) ||
((dflag & GP_DRAWDATA_IEDITHACK) && (sflag & GP_STROKE_2DSPACE)))
{
glBegin(GL_POINTS);
glVertex2fv(co);
glEnd();
}
else {
/* draw filled circle as is done in circf (but without the matrix push/pops which screwed things up) */
GLUquadricObj *qobj = gluNewQuadric();
gluQuadricDrawStyle(qobj, GLU_FILL);
/* need to translate drawing position, but must reset after too! */
glTranslate2fv(co);
gluDisk(qobj, 0.0, thickness, 32, 1);
glTranslatef(-co[0], -co[1], 0.0);
gluDeleteQuadric(qobj);
}
}
}
/* draw a given stroke in 3d (i.e. in 3d-space), using simple ogl lines */
static void gp_draw_stroke_3d(bGPDspoint *points, int totpoints, short thickness, bool debug,
short UNUSED(sflag), float diff_mat[4][4], float ink[4], bool cyclic)
{
bGPDspoint *pt, *pt2;
float curpressure = points[0].pressure;
int i;
float fpt[3];
float cyclic_fpt[3];
/* draw stroke curve */
glLineWidth(max_ff(curpressure * thickness, 1.0f));
glBegin(GL_LINE_STRIP);
for (i = 0, pt = points; i < totpoints && pt; i++, pt++) {
gp_set_point_color(pt, ink);
/* if there was a significant pressure change, stop the curve, change the thickness of the stroke,
* and continue drawing again (since line-width cannot change in middle of GL_LINE_STRIP)
* Note: we want more visible levels of pressures when thickness is bigger.
*/
if (fabsf(pt->pressure - curpressure) > 0.2f / (float)thickness) {
glEnd();
curpressure = pt->pressure;
glLineWidth(max_ff(curpressure * thickness, 1.0f));
glBegin(GL_LINE_STRIP);
/* need to roll-back one point to ensure that there are no gaps in the stroke */
if (i != 0) {
pt2 = pt - 1;
mul_v3_m4v3(fpt, diff_mat, &pt2->x);
glVertex3fv(fpt);
}
/* now the point we want... */
mul_v3_m4v3(fpt, diff_mat, &pt->x);
glVertex3fv(fpt);
}
else {
mul_v3_m4v3(fpt, diff_mat, &pt->x);
glVertex3fv(fpt);
}
/* saves first point to use in cyclic */
if (i == 0) {
copy_v3_v3(cyclic_fpt, fpt);
}
}
/* if cyclic draw line to first point */
if (cyclic) {
glVertex3fv(cyclic_fpt);
}
glEnd();
/* draw debug points of curve on top? */
/* XXX: for now, we represent "selected" strokes in the same way as debug, which isn't used anymore */
if (debug) {
glPointSize((float)(thickness + 2));
glBegin(GL_POINTS);
for (i = 0, pt = points; i < totpoints && pt; i++, pt++) {
mul_v3_m4v3(fpt, diff_mat, &pt->x);
glVertex3fv(fpt);
}
glEnd();
}
}
/* ----- Fancy 2D-Stroke Drawing ------ */
/* draw a given stroke in 2d */
static void gp_draw_stroke_2d(bGPDspoint *points, int totpoints, short thickness_s, short dflag, short sflag,
bool debug, int offsx, int offsy, int winx, int winy, float diff_mat[4][4], float ink[4])
{
/* otherwise thickness is twice that of the 3D view */
float thickness = (float)thickness_s * 0.5f;
/* strokes in Image Editor need a scale factor, since units there are not pixels! */
float scalefac = 1.0f;
if ((dflag & GP_DRAWDATA_IEDITHACK) && (dflag & GP_DRAWDATA_ONLYV2D)) {
scalefac = 0.001f;
}
/* tessellation code - draw stroke as series of connected quads with connection
* edges rotated to minimize shrinking artifacts, and rounded endcaps
*/
{
bGPDspoint *pt1, *pt2;
float s0[2], s1[2]; /* segment 'center' points */
float pm[2]; /* normal from previous segment. */
int i;
float fpt[3];
glShadeModel(GL_FLAT);
glBegin(GL_QUADS);
/* get x and y coordinates from first point */
mul_v3_m4v3(fpt, diff_mat, &points->x);
gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, s0);
for (i = 0, pt1 = points, pt2 = points + 1; i < (totpoints - 1); i++, pt1++, pt2++) {
float t0[2], t1[2]; /* tessellated coordinates */
float m1[2], m2[2]; /* gradient and normal */
float mt[2], sc[2]; /* gradient for thickness, point for end-cap */
float pthick; /* thickness at segment point */
/* get x and y coordinates from point2 (point1 has already been computed in previous iteration). */
mul_v3_m4v3(fpt, diff_mat, &pt2->x);
gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, s1);
/* calculate gradient and normal - 'angle'=(ny/nx) */
m1[1] = s1[1] - s0[1];
m1[0] = s1[0] - s0[0];
normalize_v2(m1);
m2[1] = -m1[0];
m2[0] = m1[1];
/* always use pressure from first point here */
pthick = (pt1->pressure * thickness * scalefac);
/* color of point */
gp_set_point_color(pt1, ink);
/* if the first segment, start of segment is segment's normal */
if (i == 0) {
/* draw start cap first
* - make points slightly closer to center (about halfway across)
*/
mt[0] = m2[0] * pthick * 0.5f;
mt[1] = m2[1] * pthick * 0.5f;
sc[0] = s0[0] - (m1[0] * pthick * 0.75f);
sc[1] = s0[1] - (m1[1] * pthick * 0.75f);
t0[0] = sc[0] - mt[0];
t0[1] = sc[1] - mt[1];
t1[0] = sc[0] + mt[0];
t1[1] = sc[1] + mt[1];
glVertex2fv(t0);
glVertex2fv(t1);
/* calculate points for start of segment */
mt[0] = m2[0] * pthick;
mt[1] = m2[1] * pthick;
t0[0] = s0[0] - mt[0];
t0[1] = s0[1] - mt[1];
t1[0] = s0[0] + mt[0];
t1[1] = s0[1] + mt[1];
/* draw this line twice (first to finish off start cap, then for stroke) */
glVertex2fv(t1);
glVertex2fv(t0);
glVertex2fv(t0);
glVertex2fv(t1);
}
/* if not the first segment, use bisector of angle between segments */
else {
float mb[2]; /* bisector normal */
float athick, dfac; /* actual thickness, difference between thicknesses */
/* calculate gradient of bisector (as average of normals) */
mb[0] = (pm[0] + m2[0]) / 2;
mb[1] = (pm[1] + m2[1]) / 2;
normalize_v2(mb);
/* calculate gradient to apply
* - as basis, use just pthick * bisector gradient
* - if cross-section not as thick as it should be, add extra padding to fix it
*/
mt[0] = mb[0] * pthick;
mt[1] = mb[1] * pthick;
athick = len_v2(mt);
dfac = pthick - (athick * 2);
if (((athick * 2.0f) < pthick) && (IS_EQF(athick, pthick) == 0)) {
mt[0] += (mb[0] * dfac);
mt[1] += (mb[1] * dfac);
}
/* calculate points for start of segment */
t0[0] = s0[0] - mt[0];
t0[1] = s0[1] - mt[1];
t1[0] = s0[0] + mt[0];
t1[1] = s0[1] + mt[1];
/* draw this line twice (once for end of current segment, and once for start of next) */
glVertex2fv(t1);
glVertex2fv(t0);
glVertex2fv(t0);
glVertex2fv(t1);
}
/* if last segment, also draw end of segment (defined as segment's normal) */
if (i == totpoints - 2) {
/* for once, we use second point's pressure (otherwise it won't be drawn) */
pthick = (pt2->pressure * thickness * scalefac);
/* color of point */
gp_set_point_color(pt2, ink);
/* calculate points for end of segment */
mt[0] = m2[0] * pthick;
mt[1] = m2[1] * pthick;
t0[0] = s1[0] - mt[0];
t0[1] = s1[1] - mt[1];
t1[0] = s1[0] + mt[0];
t1[1] = s1[1] + mt[1];
/* draw this line twice (once for end of stroke, and once for endcap)*/
glVertex2fv(t1);
glVertex2fv(t0);
glVertex2fv(t0);
glVertex2fv(t1);
/* draw end cap as last step
* - make points slightly closer to center (about halfway across)
*/
mt[0] = m2[0] * pthick * 0.5f;
mt[1] = m2[1] * pthick * 0.5f;
sc[0] = s1[0] + (m1[0] * pthick * 0.75f);
sc[1] = s1[1] + (m1[1] * pthick * 0.75f);
t0[0] = sc[0] - mt[0];
t0[1] = sc[1] - mt[1];
t1[0] = sc[0] + mt[0];
t1[1] = sc[1] + mt[1];
glVertex2fv(t1);
glVertex2fv(t0);
}
/* store computed point2 coordinates as point1 ones of next segment. */
copy_v2_v2(s0, s1);
/* store stroke's 'natural' normal for next stroke to use */
copy_v2_v2(pm, m2);
}
glEnd();
glShadeModel(GL_SMOOTH);
}
/* draw debug points of curve on top? (original stroke points) */
if (debug) {
bGPDspoint *pt;
int i;
float fpt[3];
glPointSize((float)(thickness_s + 2));
glBegin(GL_POINTS);
for (i = 0, pt = points; i < totpoints && pt; i++, pt++) {
float co[2];
mul_v3_m4v3(fpt, diff_mat, &pt->x);
gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, co);
glVertex2fv(co);
}
glEnd();
}
}
/* ----- 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(
bGPdata *gpd, bGPDframe *gpf, int offsx, int offsy, int winx, int winy, int dflag,
bool debug, short lthick, const float opacity, const float tintcolor[4],
const bool onion, const bool custonion, float diff_mat[4][4])
{
bGPDstroke *gps;
float tcolor[4];
float tfill[4];
short sthickness;
float ink[4];
for (gps = gpf->strokes.first; gps; gps = gps->next) {
/* check if stroke can be drawn */
if (gp_can_draw_stroke(gps, dflag) == false) {
continue;
}
/* check if the color is visible */
bGPDpalettecolor *palcolor = ED_gpencil_stroke_getcolor(gpd, gps);
if ((palcolor == NULL) ||
(palcolor->flag & PC_COLOR_HIDE) ||
/* if onion and ghost flag do not draw*/
(onion && (palcolor->flag & PC_COLOR_ONIONSKIN)))
{
continue;
}
/* calculate thickness */
sthickness = gps->thickness + lthick;
/* check which stroke-drawer to use */
if (dflag & GP_DRAWDATA_ONLY3D) {
const int no_xray = (dflag & GP_DRAWDATA_NO_XRAY);
int mask_orig = 0;
if (no_xray) {
glGetIntegerv(GL_DEPTH_WRITEMASK, &mask_orig);
glDepthMask(0);
glEnable(GL_DEPTH_TEST);
/* first arg is normally rv3d->dist, but this isn't
* available here and seems to work quite well without */
bglPolygonOffset(1.0f, 1.0f);
#if 0
glEnable(GL_POLYGON_OFFSET_LINE);
glPolygonOffset(-1.0f, -1.0f);
#endif
}
/* 3D Fill */
//if ((dflag & GP_DRAWDATA_FILL) && (gps->totpoints >= 3)) {
if (gps->totpoints >= 3) {
/* set color using palette, tint color and opacity */
interp_v3_v3v3(tfill, palcolor->fill, tintcolor, tintcolor[3]);
tfill[3] = palcolor->fill[3] * opacity;
if (tfill[3] > GPENCIL_ALPHA_OPACITY_THRESH) {
if (!onion) {
glColor4fv(tfill);
}
else {
if (custonion) {
glColor4fv(tintcolor);
}
else {
ARRAY_SET_ITEMS(tfill, UNPACK3(palcolor->fill), tintcolor[3]);
glColor4fv(tfill);
}
}
gp_draw_stroke_fill(gpd, gps, offsx, offsy, winx, winy, diff_mat);
}
}
/* 3D Stroke */
/* set color using palette, tint color and opacity */
if (!onion) {
interp_v3_v3v3(tcolor, palcolor->color, tintcolor, tintcolor[3]);
tcolor[3] = palcolor->color[3] * opacity;
copy_v4_v4(ink, tcolor);
}
else {
if (custonion) {
copy_v4_v4(ink, tintcolor);
}
else {
ARRAY_SET_ITEMS(tcolor, palcolor->color[0], palcolor->color[1], palcolor->color[2], opacity);
copy_v4_v4(ink, tcolor);
}
}
if (palcolor->flag & PC_COLOR_VOLUMETRIC) {
/* volumetric stroke drawing */
gp_draw_stroke_volumetric_3d(gps->points, gps->totpoints, sthickness, dflag, gps->flag, diff_mat, ink);
}
else {
/* 3D Lines - OpenGL primitives-based */
if (gps->totpoints == 1) {
gp_draw_stroke_point(gps->points, sthickness, dflag, gps->flag, offsx, offsy, winx, winy,
diff_mat, ink);
}
else {
gp_draw_stroke_3d(gps->points, gps->totpoints, sthickness, debug, gps->flag,
diff_mat, ink, gps->flag & GP_STROKE_CYCLIC);
}
}
if (no_xray) {
glDepthMask(mask_orig);
glDisable(GL_DEPTH_TEST);
bglPolygonOffset(0.0, 0.0);
#if 0
glDisable(GL_POLYGON_OFFSET_LINE);
glPolygonOffset(0, 0);
#endif
}
}
else {
/* 2D - Fill */
if (gps->totpoints >= 3) {
/* set color using palette, tint color and opacity */
interp_v3_v3v3(tfill, palcolor->fill, tintcolor, tintcolor[3]);
tfill[3] = palcolor->fill[3] * opacity;
if (tfill[3] > GPENCIL_ALPHA_OPACITY_THRESH) {
if (!onion) {
glColor4fv(tfill);
}
else {
if (custonion) {
glColor4fv(tintcolor);
}
else {
ARRAY_SET_ITEMS(tfill, palcolor->fill[0], palcolor->fill[1], palcolor->fill[2],
tintcolor[3]);
glColor4fv(tfill);
}
}
gp_draw_stroke_fill(gpd, gps, offsx, offsy, winx, winy, diff_mat);
}
}
/* 2D Strokes... */
/* set color using palette, tint color and opacity */
if (!onion) {
interp_v3_v3v3(tcolor, palcolor->color, tintcolor, tintcolor[3]);
tcolor[3] = palcolor->color[3] * opacity;
copy_v4_v4(ink, tcolor);
}
else {
if (custonion) {
copy_v4_v4(ink, tintcolor);
}
else {
ARRAY_SET_ITEMS(tcolor, palcolor->color[0], palcolor->color[1], palcolor->color[2], opacity);
copy_v4_v4(ink, tcolor);
}
}
if (palcolor->flag & PC_COLOR_VOLUMETRIC) {
/* blob/disk-based "volumetric" drawing */
gp_draw_stroke_volumetric_2d(gps->points, gps->totpoints, sthickness, dflag, gps->flag,
offsx, offsy, winx, winy, diff_mat, ink);
}
else {
/* normal 2D strokes */
if (gps->totpoints == 1) {
gp_draw_stroke_point(gps->points, sthickness, dflag, gps->flag, offsx, offsy, winx, winy,
diff_mat, ink);
}
else {
gp_draw_stroke_2d(gps->points, gps->totpoints, sthickness, dflag, gps->flag, debug,
offsx, offsy, winx, winy, diff_mat, ink);
}
}
}
}
}
/* Draw selected verts for strokes being edited */
static void gp_draw_strokes_edit(
bGPdata *gpd, bGPDframe *gpf, int offsx, int offsy, int winx, int winy, short dflag,
short lflag, float diff_mat[4][4], float alpha)
{
bGPDstroke *gps;
/* if alpha 0 do not draw */
if (alpha == 0.0f)
return;
const bool no_xray = (dflag & GP_DRAWDATA_NO_XRAY) != 0;
int mask_orig = 0;
/* set up depth masks... */
if (dflag & GP_DRAWDATA_ONLY3D) {
if (no_xray) {
glGetIntegerv(GL_DEPTH_WRITEMASK, &mask_orig);
glDepthMask(0);
glEnable(GL_DEPTH_TEST);
/* first arg is normally rv3d->dist, but this isn't
* available here and seems to work quite well without */
bglPolygonOffset(1.0f, 1.0f);
#if 0
glEnable(GL_POLYGON_OFFSET_LINE);
glPolygonOffset(-1.0f, -1.0f);
#endif
}
}
/* draw stroke verts */
for (gps = gpf->strokes.first; gps; gps = gps->next) {
bGPDspoint *pt;
float vsize, bsize;
int i;
float fpt[3];
/* check if stroke can be drawn */
if (gp_can_draw_stroke(gps, dflag) == false)
continue;
/* Optimisation: only draw points for selected strokes
* We assume that selected points can only occur in
* strokes that are selected too.
*/
if ((gps->flag & GP_STROKE_SELECT) == 0)
continue;
/* verify palette color lock */
{
bGPDpalettecolor *palcolor = ED_gpencil_stroke_getcolor(gpd, gps);
if (palcolor != NULL) {
if (palcolor->flag & PC_COLOR_HIDE) {
continue;
}
if (((lflag & GP_LAYER_UNLOCK_COLOR) == 0) && (palcolor->flag & PC_COLOR_LOCKED)) {
continue;
}
}
}
/* Get size of verts:
* - The selected state needs to be larger than the unselected state so that
* they stand out more.
* - We use the theme setting for size of the unselected verts
*/
bsize = UI_GetThemeValuef(TH_GP_VERTEX_SIZE);
if ((int)bsize > 8) {
vsize = 10.0f;
bsize = 8.0f;
}
else {
vsize = bsize + 2;
}
/* First Pass: Draw all the verts (i.e. these become the unselected state) */
/* for now, we assume that the base color of the points is not too close to the real color */
/* set color using palette */
bGPDpalettecolor *palcolor = ED_gpencil_stroke_getcolor(gpd, gps);
glColor3fv(palcolor->color);
glPointSize(bsize);
glBegin(GL_POINTS);
for (i = 0, pt = gps->points; i < gps->totpoints && pt; i++, pt++) {
if (gps->flag & GP_STROKE_3DSPACE) {
mul_v3_m4v3(fpt, diff_mat, &pt->x);
glVertex3fv(fpt);
}
else {
float co[2];
mul_v3_m4v3(fpt, diff_mat, &pt->x);
gp_calc_2d_stroke_fxy(fpt, gps->flag, offsx, offsy, winx, winy, co);
glVertex2fv(co);
}
}
glEnd();
/* Second Pass: Draw only verts which are selected */
float curColor[4];
UI_GetThemeColor3fv(TH_GP_VERTEX_SELECT, curColor);
glColor4f(curColor[0], curColor[1], curColor[2], alpha);
glPointSize(vsize);
glBegin(GL_POINTS);
for (i = 0, pt = gps->points; i < gps->totpoints && pt; i++, pt++) {
if (pt->flag & GP_SPOINT_SELECT) {
if (gps->flag & GP_STROKE_3DSPACE) {
mul_v3_m4v3(fpt, diff_mat, &pt->x);
glVertex3fv(fpt);
}
else {
float co[2];
mul_v3_m4v3(fpt, diff_mat, &pt->x);
gp_calc_2d_stroke_fxy(fpt, gps->flag, offsx, offsy, winx, winy, co);
glVertex2fv(co);
}
}
}
glEnd();
/* Draw start and end point if enabled stroke direction hint */
if ((gpd->flag & GP_DATA_SHOW_DIRECTION) && (gps->totpoints > 1)) {
bGPDspoint *p;
glPointSize(vsize + 4);
glBegin(GL_POINTS);
/* start point in green bigger */
glColor3f(0.0f, 1.0f, 0.0f);
p = &gps->points[0];
mul_v3_m4v3(fpt, diff_mat, &p->x);
glVertex3fv(fpt);
glEnd();
/* end point in red smaller */
glPointSize(vsize + 1);
glBegin(GL_POINTS);
glColor3f(1.0f, 0.0f, 0.0f);
p = &gps->points[gps->totpoints - 1];
mul_v3_m4v3(fpt, diff_mat, &p->x);
glVertex3fv(fpt);
glEnd();
}
}
/* clear depth mask */
if (dflag & GP_DRAWDATA_ONLY3D) {
if (no_xray) {
glDepthMask(mask_orig);
glDisable(GL_DEPTH_TEST);
bglPolygonOffset(0.0, 0.0);
#if 0
glDisable(GL_POLYGON_OFFSET_LINE);
glPolygonOffset(0, 0);
#endif
}
}
}
/* ----- General Drawing ------ */
/* draw onion-skinning for a layer */
static void gp_draw_onionskins(
bGPdata *gpd, bGPDlayer *gpl, bGPDframe *gpf, int offsx, int offsy, int winx, int winy,
int UNUSED(cfra), int dflag, bool debug, float diff_mat[4][4])
{
const float default_color[3] = {UNPACK3(U.gpencil_new_layer_col)};
const float alpha = 1.0f;
float color[4];
/* 1) Draw Previous Frames First */
if (gpl->flag & GP_LAYER_GHOST_PREVCOL) {
copy_v3_v3(color, gpl->gcolor_prev);
}
else {
copy_v3_v3(color, default_color);
}
if (gpl->gstep > 0) {
bGPDframe *gf;
float fac;
/* draw previous frames first */
for (gf = gpf->prev; gf; gf = gf->prev) {
/* check if frame is drawable */
if ((gpf->framenum - gf->framenum) <= gpl->gstep) {
/* alpha decreases with distance from curframe index */
fac = 1.0f - ((float)(gpf->framenum - gf->framenum) / (float)(gpl->gstep + 1));
color[3] = alpha * fac * 0.66f;
gp_draw_strokes(gpd, gf, offsx, offsy, winx, winy, dflag, debug, gpl->thickness, 1.0f, color,
true, gpl->flag & GP_LAYER_GHOST_PREVCOL, diff_mat);
}
else
break;
}
}
else if (gpl->gstep == 0) {
/* draw the strokes for the ghost frames (at half of the alpha set by user) */
if (gpf->prev) {
color[3] = (alpha / 7);
gp_draw_strokes(gpd, gpf->prev, offsx, offsy, winx, winy, dflag, debug, gpl->thickness, 1.0f, color,
true, gpl->flag & GP_LAYER_GHOST_PREVCOL, diff_mat);
}
}
else {
/* don't draw - disabled */
}
/* 2) Now draw next frames */
if (gpl->flag & GP_LAYER_GHOST_NEXTCOL) {
copy_v3_v3(color, gpl->gcolor_next);
}
else {
copy_v3_v3(color, default_color);
}
if (gpl->gstep_next > 0) {
bGPDframe *gf;
float fac;
/* now draw next frames */
for (gf = gpf->next; gf; gf = gf->next) {
/* check if frame is drawable */
if ((gf->framenum - gpf->framenum) <= gpl->gstep_next) {
/* alpha decreases with distance from curframe index */
fac = 1.0f - ((float)(gf->framenum - gpf->framenum) / (float)(gpl->gstep_next + 1));
color[3] = alpha * fac * 0.66f;
gp_draw_strokes(gpd, gf, offsx, offsy, winx, winy, dflag, debug, gpl->thickness, 1.0f, color,
true, gpl->flag & GP_LAYER_GHOST_NEXTCOL, diff_mat);
}
else
break;
}
}
else if (gpl->gstep_next == 0) {
/* draw the strokes for the ghost frames (at half of the alpha set by user) */
if (gpf->next) {
color[3] = (alpha / 4);
gp_draw_strokes(gpd, gpf->next, offsx, offsy, winx, winy, dflag, debug, gpl->thickness, 1.0f, color,
true, gpl->flag & GP_LAYER_GHOST_NEXTCOL, diff_mat);
}
}
else {
/* don't draw - disabled */
}
}
/* draw interpolate strokes (used only while operator is running) */
void ED_gp_draw_interpolation(tGPDinterpolate *tgpi, const int type)
{
tGPDinterpolate_layer *tgpil;
float diff_mat[4][4];
float color[4];
int offsx = 0;
int offsy = 0;
int winx = tgpi->ar->winx;
int winy = tgpi->ar->winy;
UI_GetThemeColor3fv(TH_GP_VERTEX_SELECT, color);
color[3] = 0.6f;
int dflag = 0;
/* if 3d stuff, enable flags */
if (type == REGION_DRAW_POST_VIEW) {
dflag |= (GP_DRAWDATA_ONLY3D | GP_DRAWDATA_NOSTATUS);
}
/* turn on alpha-blending */
glEnable(GL_BLEND);
for (tgpil = tgpi->ilayers.first; tgpil; tgpil = tgpil->next) {
/* calculate parent position */
ED_gpencil_parent_location(tgpil->gpl, diff_mat);
if (tgpil->interFrame) {
gp_draw_strokes(tgpi->gpd, tgpil->interFrame, offsx, offsy, winx, winy, dflag, false,
tgpil->gpl->thickness, 1.0f, color, true, true, diff_mat);
}
}
glDisable(GL_BLEND);
}
/* loop over gpencil data layers, drawing them */
static void gp_draw_data_layers(
bGPDbrush *brush, float alpha, bGPdata *gpd,
int offsx, int offsy, int winx, int winy, int cfra, int dflag)
{
bGPDlayer *gpl;
float diff_mat[4][4];
for (gpl = gpd->layers.first; gpl; gpl = gpl->next) {
bGPDframe *gpf;
/* calculate parent position */
ED_gpencil_parent_location(gpl, diff_mat);
bool debug = (gpl->flag & GP_LAYER_DRAWDEBUG) ? true : false;
short lthick = brush->thickness + gpl->thickness;
/* don't draw layer if hidden */
if (gpl->flag & GP_LAYER_HIDE)
continue;
/* get frame to draw */
gpf = BKE_gpencil_layer_getframe(gpl, cfra, 0);
if (gpf == NULL)
continue;
/* set basic stroke thickness */
glLineWidth(lthick);
/* Add layer drawing settings to the set of "draw flags"
* NOTE: If the setting doesn't apply, it *must* be cleared,
* as dflag's carry over from the previous layer
*/
#define GP_DRAWFLAG_APPLY(condition, draw_flag_value) { \
if (condition) dflag |= (draw_flag_value); \
else dflag &= ~(draw_flag_value); \
} (void)0
/* xray... */
GP_DRAWFLAG_APPLY((gpl->flag & GP_LAYER_NO_XRAY), GP_DRAWDATA_NO_XRAY);
/* volumetric strokes... */
GP_DRAWFLAG_APPLY((gpl->flag & GP_LAYER_VOLUMETRIC), GP_DRAWDATA_VOLUMETRIC);
/* HQ fills... */
GP_DRAWFLAG_APPLY((gpl->flag & GP_LAYER_HQ_FILL), GP_DRAWDATA_HQ_FILL);
#undef GP_DRAWFLAG_APPLY
/* Draw 'onionskins' (frame left + right)
* - It is only possible to show these if the option is enabled
* - The "no onions" flag prevents ghosts from appearing during animation playback/scrubbing
* and in renders
* - The per-layer "always show" flag however overrides the playback/render restriction,
* allowing artists to selectively turn onionskins on/off during playback
*/
if ((gpl->flag & GP_LAYER_ONIONSKIN) &&
((dflag & GP_DRAWDATA_NO_ONIONS) == 0 || (gpl->flag & GP_LAYER_GHOST_ALWAYS)))
{
/* Drawing method - only immediately surrounding (gstep = 0),
* or within a frame range on either side (gstep > 0)
*/
gp_draw_onionskins(gpd, gpl, gpf, offsx, offsy, winx, winy, cfra, dflag, debug, diff_mat);
}
/* draw the strokes already in active frame */
gp_draw_strokes(gpd, gpf, offsx, offsy, winx, winy, dflag, debug, gpl->thickness,
gpl->opacity, gpl->tintcolor, false, false, diff_mat);
/* Draw verts of selected strokes
* - when doing OpenGL renders, we don't want to be showing these, as that ends up flickering
* - locked layers can't be edited, so there's no point showing these verts
* as they will have no bearings on what gets edited
* - only show when in editmode, since operators shouldn't work otherwise
* (NOTE: doing it this way means that the toggling editmode shows visible change immediately)
*/
/* XXX: perhaps we don't want to show these when users are drawing... */
if ((G.f & G_RENDER_OGL) == 0 &&
(gpl->flag & GP_LAYER_LOCKED) == 0 &&
(gpd->flag & GP_DATA_STROKE_EDITMODE))
{
gp_draw_strokes_edit(gpd, gpf, offsx, offsy, winx, winy, dflag, gpl->flag, diff_mat, alpha);
}
/* Check if may need to draw the active stroke cache, only if this layer is the active layer
* that is being edited. (Stroke buffer is currently stored in gp-data)
*/
if (ED_gpencil_session_active() && (gpl->flag & GP_LAYER_ACTIVE) &&
(gpf->flag & GP_FRAME_PAINT))
{
/* Set color for drawing buffer stroke - since this may not be set yet */
// glColor4fv(gpl->color);
/* Buffer stroke needs to be drawn with a different linestyle
* to help differentiate them from normal strokes.
*
* It should also be noted that sbuffer contains temporary point types
* i.e. tGPspoints NOT bGPDspoints
*/
if (gpd->sflag & PC_COLOR_VOLUMETRIC) {
gp_draw_stroke_volumetric_buffer(gpd->sbuffer, gpd->sbuffer_size, lthick,
dflag, gpd->sbuffer_sflag, gpd->scolor);
}
else {
gp_draw_stroke_buffer(gpd->sbuffer, gpd->sbuffer_size, lthick, dflag, gpd->sbuffer_sflag, gpd->scolor);
}
}
}
}
/* draw a short status message in the top-right corner */
static void gp_draw_status_text(bGPdata *gpd, ARegion *ar)
{
rcti rect;
/* Cannot draw any status text when drawing OpenGL Renders */
if (G.f & G_RENDER_OGL)
return;
/* Get bounds of region - Necessary to avoid problems with region overlap */
ED_region_visible_rect(ar, &rect);
/* for now, this should only be used to indicate when we are in stroke editmode */
if (gpd->flag & GP_DATA_STROKE_EDITMODE) {
const char *printable = IFACE_("GPencil Stroke Editing");
float printable_size[2];
int xco, yco;
BLF_width_and_height_default(printable, BLF_DRAW_STR_DUMMY_MAX, &printable_size[0], &printable_size[1]);
xco = (rect.xmax - U.widget_unit) - (int)printable_size[0];
yco = (rect.ymax - U.widget_unit);
/* text label */
UI_ThemeColor(TH_TEXT_HI);
#ifdef WITH_INTERNATIONAL
BLF_draw_default(xco, yco, 0.0f, printable, BLF_DRAW_STR_DUMMY_MAX);
#else
BLF_draw_default_ascii(xco, yco, 0.0f, printable, BLF_DRAW_STR_DUMMY_MAX);
#endif
/* grease pencil icon... */
// XXX: is this too intrusive?
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
xco -= U.widget_unit;
yco -= (int)printable_size[1] / 2;
UI_icon_draw(xco, yco, ICON_GREASEPENCIL);
glDisable(GL_BLEND);
}
}
/* draw grease-pencil datablock */
static void gp_draw_data(
bGPDbrush *brush, float alpha, bGPdata *gpd,
int offsx, int offsy, int winx, int winy, int cfra, int dflag)
{
/* reset line drawing style (in case previous user didn't reset) */
setlinestyle(0);
/* turn on smooth lines (i.e. anti-aliasing) */
glEnable(GL_LINE_SMOOTH);
/* XXX: turn on some way of ensuring that the polygon edges get smoothed
* GL_POLYGON_SMOOTH is nasty and shouldn't be used, as it ends up
* creating internal white rays due to the ways it accumulates stuff
*/
/* turn on alpha-blending */
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
/* draw! */
gp_draw_data_layers(brush, alpha, gpd, offsx, offsy, winx, winy, cfra, dflag);
/* turn off alpha blending, then smooth lines */
glDisable(GL_BLEND); // alpha blending
glDisable(GL_LINE_SMOOTH); // smooth lines
/* restore initial gl conditions */
glColor4f(0, 0, 0, 1);
}
/* if we have strokes for scenes (3d view)/clips (movie clip editor)
* and objects/tracks, multiple data blocks have to be drawn */
static void gp_draw_data_all(Scene *scene, bGPdata *gpd, int offsx, int offsy, int winx, int winy,
int cfra, int dflag, const char spacetype)
{
bGPdata *gpd_source = NULL;
ToolSettings *ts;
bGPDbrush *brush = NULL;
if (scene) {
ts = scene->toolsettings;
brush = BKE_gpencil_brush_getactive(ts);
/* if no brushes, create default set */
if (brush == NULL) {
BKE_gpencil_brush_init_presets(ts);
brush = BKE_gpencil_brush_getactive(ts);
}
if (spacetype == SPACE_VIEW3D) {
gpd_source = (scene->gpd ? scene->gpd : NULL);
}
else if (spacetype == SPACE_CLIP && scene->clip) {
/* currently drawing only gpencil data from either clip or track, but not both - XXX fix logic behind */
gpd_source = (scene->clip->gpd ? scene->clip->gpd : NULL);
}
if (gpd_source) {
if (brush != NULL) {
gp_draw_data(brush, ts->gp_sculpt.alpha, gpd_source,
offsx, offsy, winx, winy, cfra, dflag);
}
}
}
/* scene/clip data has already been drawn, only object/track data is drawn here
* if gpd_source == gpd, we don't have any object/track data and we can skip */
if (gpd_source == NULL || (gpd_source && gpd_source != gpd)) {
if (brush != NULL) {
gp_draw_data(brush, ts->gp_sculpt.alpha, gpd,
offsx, offsy, winx, winy, cfra, dflag);
}
}
}
/* ----- Grease Pencil Sketches Drawing API ------ */
/* ............................
* XXX
* We need to review the calls below, since they may be/are not that suitable for
* the new ways that we intend to be drawing data...
* ............................ */
/* draw grease-pencil sketches to specified 2d-view that uses ibuf corrections */
void ED_gpencil_draw_2dimage(const bContext *C)
{
wmWindowManager *wm = CTX_wm_manager(C);
ScrArea *sa = CTX_wm_area(C);
ARegion *ar = CTX_wm_region(C);
Scene *scene = CTX_data_scene(C);
bGPdata *gpd;
int offsx, offsy, sizex, sizey;
int dflag = GP_DRAWDATA_NOSTATUS;
gpd = ED_gpencil_data_get_active(C); // XXX
if (gpd == NULL) return;
/* calculate rect */
switch (sa->spacetype) {
case SPACE_IMAGE: /* image */
case SPACE_CLIP: /* clip */
{
/* just draw using standard scaling (settings here are currently ignored anyways) */
/* FIXME: the opengl poly-strokes don't draw at right thickness when done this way, so disabled */
offsx = 0;
offsy = 0;
sizex = ar->winx;
sizey = ar->winy;
wmOrtho2(ar->v2d.cur.xmin, ar->v2d.cur.xmax, ar->v2d.cur.ymin, ar->v2d.cur.ymax);
dflag |= GP_DRAWDATA_ONLYV2D | GP_DRAWDATA_IEDITHACK;
break;
}
case SPACE_SEQ: /* sequence */
{
/* just draw using standard scaling (settings here are currently ignored anyways) */
offsx = 0;
offsy = 0;
sizex = ar->winx;
sizey = ar->winy;
/* NOTE: I2D was used in 2.4x, but the old settings for that have been deprecated
* and everything moved to standard View2d
*/
dflag |= GP_DRAWDATA_ONLYV2D;
break;
}
default: /* for spacetype not yet handled */
offsx = 0;
offsy = 0;
sizex = ar->winx;
sizey = ar->winy;
dflag |= GP_DRAWDATA_ONLYI2D;
break;
}
if (ED_screen_animation_playing(wm)) {
/* don't show onionskins during animation playback/scrub (i.e. it obscures the poses)
* OpenGL Renders (i.e. final output), or depth buffer (i.e. not real strokes)
*/
dflag |= GP_DRAWDATA_NO_ONIONS;
}
/* draw it! */
gp_draw_data_all(scene, gpd, offsx, offsy, sizex, sizey, CFRA, dflag, sa->spacetype);
}
/* draw grease-pencil sketches to specified 2d-view assuming that matrices are already set correctly
* Note: this gets called twice - first time with onlyv2d=1 to draw 'canvas' strokes,
* second time with onlyv2d=0 for screen-aligned strokes */
void ED_gpencil_draw_view2d(const bContext *C, bool onlyv2d)
{
wmWindowManager *wm = CTX_wm_manager(C);
ScrArea *sa = CTX_wm_area(C);
ARegion *ar = CTX_wm_region(C);
Scene *scene = CTX_data_scene(C);
bGPdata *gpd;
int dflag = 0;
/* check that we have grease-pencil stuff to draw */
if (sa == NULL) return;
gpd = ED_gpencil_data_get_active(C); // XXX
if (gpd == NULL) return;
/* special hack for Image Editor */
/* FIXME: the opengl poly-strokes don't draw at right thickness when done this way, so disabled */
if (ELEM(sa->spacetype, SPACE_IMAGE, SPACE_CLIP))
dflag |= GP_DRAWDATA_IEDITHACK;
/* draw it! */
if (onlyv2d) dflag |= (GP_DRAWDATA_ONLYV2D | GP_DRAWDATA_NOSTATUS);
if (ED_screen_animation_playing(wm)) dflag |= GP_DRAWDATA_NO_ONIONS;
gp_draw_data_all(scene, gpd, 0, 0, ar->winx, ar->winy, CFRA, dflag, sa->spacetype);
/* draw status text (if in screen/pixel-space) */
if (onlyv2d == false) {
gp_draw_status_text(gpd, ar);
}
}
/* draw grease-pencil sketches to specified 3d-view assuming that matrices are already set correctly
* Note: this gets called twice - first time with only3d=1 to draw 3d-strokes,
* second time with only3d=0 for screen-aligned strokes */
void ED_gpencil_draw_view3d(wmWindowManager *wm, Scene *scene, View3D *v3d, ARegion *ar, bool only3d)
{
bGPdata *gpd;
int dflag = 0;
RegionView3D *rv3d = ar->regiondata;
int offsx, offsy, winx, winy;
/* check that we have grease-pencil stuff to draw */
gpd = ED_gpencil_data_get_active_v3d(scene, v3d);
if (gpd == NULL) return;
/* when rendering to the offscreen buffer we don't want to
* deal with the camera border, otherwise map the coords to the camera border. */
if ((rv3d->persp == RV3D_CAMOB) && !(G.f & G_RENDER_OGL)) {
rctf rectf;
ED_view3d_calc_camera_border(scene, ar, v3d, rv3d, &rectf, true); /* no shift */
offsx = round_fl_to_int(rectf.xmin);
offsy = round_fl_to_int(rectf.ymin);
winx = round_fl_to_int(rectf.xmax - rectf.xmin);
winy = round_fl_to_int(rectf.ymax - rectf.ymin);
}
else {
offsx = 0;
offsy = 0;
winx = ar->winx;
winy = ar->winy;
}
/* set flags */
if (only3d) {
/* 3D strokes/3D space:
* - only 3D space points
* - don't status text either (as it's the wrong space)
*/
dflag |= (GP_DRAWDATA_ONLY3D | GP_DRAWDATA_NOSTATUS);
}
if (v3d->flag2 & V3D_RENDER_OVERRIDE) {
/* don't draw status text when "only render" flag is set */
dflag |= GP_DRAWDATA_NOSTATUS;
}
if ((wm == NULL) || ED_screen_animation_playing(wm)) {
/* don't show onionskins during animation playback/scrub (i.e. it obscures the poses)
* OpenGL Renders (i.e. final output), or depth buffer (i.e. not real strokes)
*/
dflag |= GP_DRAWDATA_NO_ONIONS;
}
/* draw it! */
gp_draw_data_all(scene, gpd, offsx, offsy, winx, winy, CFRA, dflag, v3d->spacetype);
}
void ED_gpencil_draw_ex(Scene *scene, bGPdata *gpd, int winx, int winy, const int cfra, const char spacetype)
{
int dflag = GP_DRAWDATA_NOSTATUS | GP_DRAWDATA_ONLYV2D;
gp_draw_data_all(scene, gpd, 0, 0, winx, winy, cfra, dflag, spacetype);
}
/* ************************************************** */
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