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|
/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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
*
* Contributor(s): Joshua Leung, Antonio Vazquez
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/editors/gpencil/annotate_draw.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_glutil.h"
#include "GPU_immediate.h"
#include "GPU_draw.h"
#include "GPU_state.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) */
} eDrawStrokeFlags;
/* ----- Tool Buffer Drawing ------ */
/* draw stroke defined in buffer (simple ogl lines/points for now, as dotted lines) */
static void gp_draw_stroke_buffer(
const tGPspoint *points, int totpoints, short thickness,
short dflag, short sflag, float ink[4])
{
int draw_points = 0;
/* error checking */
if ((points == NULL) || (totpoints <= 0))
return;
/* check if buffer can be drawn */
if (dflag & (GP_DRAWDATA_ONLY3D | GP_DRAWDATA_ONLYV2D))
return;
if (sflag & GP_STROKE_ERASER) {
/* don't draw stroke at all! */
return;
}
GPUVertFormat *format = immVertexFormat();
uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
const tGPspoint *pt = points;
if (totpoints == 1) {
/* if drawing a single point, draw it larger */
GPU_point_size((float)(thickness + 2) * points->pressure);
immBindBuiltinProgram(GPU_SHADER_3D_POINT_UNIFORM_SIZE_UNIFORM_COLOR_AA);
immUniformColor3fvAlpha(ink, ink[3]);
immBegin(GPU_PRIM_POINTS, 1);
immVertex2iv(pos, &pt->x);
}
else {
float oldpressure = points[0].pressure;
/* draw stroke curve */
GPU_line_width(max_ff(oldpressure * thickness, 1.0));
immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
immUniformColor3fvAlpha(ink, ink[3]);
immBeginAtMost(GPU_PRIM_LINE_STRIP, totpoints);
for (int i = 0; i < totpoints; 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) {
/* need to have 2 points to avoid immEnd assert error */
if (draw_points < 2) {
immVertex2iv(pos, &(pt - 1)->x);
}
immEnd();
draw_points = 0;
GPU_line_width(max_ff(pt->pressure * thickness, 1.0f));
immBeginAtMost(GPU_PRIM_LINE_STRIP, totpoints - i + 1);
/* need to roll-back one point to ensure that there are no gaps in the stroke */
if (i != 0) {
immVertex2iv(pos, &(pt - 1)->x);
draw_points++;
}
oldpressure = pt->pressure; /* reset our threshold */
}
/* now the point we want */
immVertex2iv(pos, &pt->x);
draw_points++;
}
/* need to have 2 points to avoid immEnd assert error */
if (draw_points < 2) {
immVertex2iv(pos, &(pt - 1)->x);
}
}
immEnd();
immUnbindProgram();
}
/* --------- 2D Stroke Drawing Helpers --------- */
/* change in parameter list */
static void gp_calc_2d_stroke_fxy(const 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;
}
}
/* ----- Existing Strokes Drawing (3D and Point) ------ */
/* draw a given stroke - just a single dot (only one point) */
static void gp_draw_stroke_point(
const bGPDspoint *points, short thickness, short UNUSED(dflag), short sflag,
int offsx, int offsy, int winx, int winy, const float ink[4])
{
const bGPDspoint *pt = points;
/* get final position using parent matrix */
float fpt[3];
copy_v3_v3(fpt, &pt->x);
GPUVertFormat *format = immVertexFormat();
uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
if (sflag & GP_STROKE_3DSPACE) {
immBindBuiltinProgram(GPU_SHADER_3D_POINT_UNIFORM_SIZE_UNIFORM_COLOR_AA);
}
else {
immBindBuiltinProgram(GPU_SHADER_2D_POINT_UNIFORM_SIZE_UNIFORM_COLOR_AA);
/* get 2D coordinates of point */
float co[3] = { 0.0f };
gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, co);
copy_v3_v3(fpt, co);
}
/* set color */
immUniformColor3fvAlpha(ink, ink[3]);
/* set point thickness (since there's only one of these) */
immUniform1f("size", (float)(thickness + 2) * pt->pressure);
immBegin(GPU_PRIM_POINTS, 1);
immVertex3fv(pos, fpt);
immEnd();
immUnbindProgram();
}
/* draw a given stroke in 3d (i.e. in 3d-space), using simple ogl lines */
static void gp_draw_stroke_3d(
const bGPDspoint *points, int totpoints, short thickness,
short UNUSED(sflag), const float ink[4], bool cyclic)
{
float curpressure = points[0].pressure;
float cyclic_fpt[3];
int draw_points = 0;
/* if cyclic needs one vertex more */
int cyclic_add = 0;
if (cyclic) {
cyclic_add++;
}
GPUVertFormat *format = immVertexFormat();
uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
immUniformColor3fvAlpha(ink, ink[3]);
/* draw stroke curve */
GPU_line_width(max_ff(curpressure * thickness, 1.0f));
immBeginAtMost(GPU_PRIM_LINE_STRIP, totpoints + cyclic_add);
const bGPDspoint *pt = points;
for (int i = 0; i < totpoints; 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)
* Note: we want more visible levels of pressures when thickness is bigger.
*/
if (fabsf(pt->pressure - curpressure) > 0.2f / (float)thickness) {
/* if the pressure changes before get at least 2 vertices, need to repeat last point to avoid assert in immEnd() */
if (draw_points < 2) {
const bGPDspoint *pt2 = pt - 1;
immVertex3fv(pos, &pt2->x);
}
immEnd();
draw_points = 0;
curpressure = pt->pressure;
GPU_line_width(max_ff(curpressure * thickness, 1.0f));
immBeginAtMost(GPU_PRIM_LINE_STRIP, totpoints - i + 1 + cyclic_add);
/* need to roll-back one point to ensure that there are no gaps in the stroke */
if (i != 0) {
const bGPDspoint *pt2 = pt - 1;
immVertex3fv(pos, &pt2->x);
draw_points++;
}
}
/* now the point we want */
immVertex3fv(pos, &pt->x);
draw_points++;
if (cyclic && i == 0) {
/* save first point to use in cyclic */
copy_v3_v3(cyclic_fpt, &pt->x);
}
}
if (cyclic) {
/* draw line to first point to complete the cycle */
immVertex3fv(pos, cyclic_fpt);
draw_points++;
}
/* if less of two points, need to repeat last point to avoid assert in immEnd() */
if (draw_points < 2) {
const bGPDspoint *pt2 = pt - 1;
immVertex3fv(pos, &pt2->x);
}
immEnd();
immUnbindProgram();
}
/* ----- Fancy 2D-Stroke Drawing ------ */
/* draw a given stroke in 2d */
static void gp_draw_stroke_2d(
const bGPDspoint *points, int totpoints, short thickness_s, short dflag, short sflag,
int offsx, int offsy, int winx, int winy, const 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 (triangle strips in fact) with connection
* edges rotated to minimize shrinking artifacts, and rounded endcaps
*/
{
const bGPDspoint *pt1, *pt2;
float s0[2], s1[2]; /* segment 'center' points */
float pm[2]; /* normal from previous segment. */
int i;
GPUVertFormat *format = immVertexFormat();
uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
immUniformColor3fvAlpha(ink, ink[3]);
immBegin(GPU_PRIM_TRI_STRIP, totpoints * 2 + 4);
/* get x and y coordinates from first point */
gp_calc_2d_stroke_fxy(&points->x, 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). */
gp_calc_2d_stroke_fxy(&pt2->x, 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);
/* 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];
/* First two points of cap. */
immVertex2fv(pos, t0);
immVertex2fv(pos, 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];
/* Last two points of start cap (and first two points of first segment). */
immVertex2fv(pos, t0);
immVertex2fv(pos, 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];
/* Last two points of previous segment, and first two points of current segment. */
immVertex2fv(pos, t0);
immVertex2fv(pos, 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);
/* 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];
/* Last two points of last segment (and first two points of end cap). */
immVertex2fv(pos, t0);
immVertex2fv(pos, 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];
/* Last two points of end cap. */
immVertex2fv(pos, t0);
immVertex2fv(pos, t1);
}
/* 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);
}
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(
bGPdata *UNUSED(gpd), bGPDlayer *UNUSED(gpl), const bGPDframe *gpf, int offsx, int offsy, int winx, int winy,
int dflag, short lthick, const float color[4])
{
GPU_enable_program_point_size();
for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {
/* check if stroke can be drawn */
if (gp_can_draw_stroke(gps, dflag) == false) {
continue;
}
/* 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);
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 Lines - OpenGL primitives-based */
if (gps->totpoints == 1) {
gp_draw_stroke_point(gps->points, lthick, dflag, gps->flag, offsx, offsy, winx, winy, color);
}
else {
gp_draw_stroke_3d(
gps->points, gps->totpoints, lthick, gps->flag,
color, gps->flag & GP_STROKE_CYCLIC);
}
if (no_xray) {
glDepthMask(mask_orig);
GPU_depth_test(false);
bglPolygonOffset(0.0, 0.0);
}
}
else {
/* 2D Strokes... */
if (gps->totpoints == 1) {
gp_draw_stroke_point(gps->points, lthick, dflag, gps->flag, offsx, offsy, winx, winy, color);
}
else {
gp_draw_stroke_2d(
gps->points, gps->totpoints, lthick, dflag, gps->flag,
offsx, offsy, winx, winy, color);
}
}
}
GPU_disable_program_point_size();
}
/* Draw selected verts for strokes being edited */
static void gp_draw_strokes_edit(
bGPdata *gpd, bGPDlayer *gpl, const bGPDframe *gpf,
int offsx, int offsy, int winx, int winy,
short dflag, short UNUSED(lflag), float alpha)
{
/* 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);
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);
}
}
GPU_enable_program_point_size();
/* draw stroke verts */
for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {
/* 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;
/* 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
*/
float bsize = UI_GetThemeValuef(TH_GP_VERTEX_SIZE);
float vsize;
if ((int)bsize > 8) {
vsize = 10.0f;
bsize = 8.0f;
}
else {
vsize = bsize + 2;
}
float selectColor[4];
UI_GetThemeColor3fv(TH_GP_VERTEX_SELECT, selectColor);
selectColor[3] = alpha;
GPUVertFormat *format = immVertexFormat();
uint pos; /* specified later */
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_F32, 3, GPU_FETCH_FLOAT);
if (gps->flag & GP_STROKE_3DSPACE) {
pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
immBindBuiltinProgram(GPU_SHADER_3D_POINT_VARYING_SIZE_VARYING_COLOR);
}
else {
pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
immBindBuiltinProgram(GPU_SHADER_2D_POINT_VARYING_SIZE_VARYING_COLOR);
}
immBegin(GPU_PRIM_POINTS, gps->totpoints);
/* Draw start and end point differently if enabled stroke direction hint */
bool show_direction_hint = (gpd->flag & GP_DATA_SHOW_DIRECTION) && (gps->totpoints > 1);
/* Draw all the stroke points (selected or not) */
bGPDspoint *pt = gps->points;
for (int i = 0; i < gps->totpoints; i++, pt++) {
/* size and color first */
if (show_direction_hint && i == 0) {
/* start point in green bigger */
immAttr3f(color, 0.0f, 1.0f, 0.0f);
immAttr1f(size, vsize + 4);
}
else if (show_direction_hint && (i == gps->totpoints - 1)) {
/* end point in red smaller */
immAttr3f(color, 1.0f, 0.0f, 0.0f);
immAttr1f(size, vsize + 1);
}
else if (pt->flag & GP_SPOINT_SELECT) {
immAttr3fv(color, selectColor);
immAttr1f(size, vsize);
}
else {
immAttr3fv(color, gpl->color);
immAttr1f(size, bsize);
}
/* then position */
if (gps->flag & GP_STROKE_3DSPACE) {
immVertex3fv(pos, &pt->x);
}
else {
float co[2];
gp_calc_2d_stroke_fxy(&pt->x, gps->flag, offsx, offsy, winx, winy, co);
immVertex2fv(pos, co);
}
}
immEnd();
immUnbindProgram();
}
GPU_disable_program_point_size();
/* clear depth mask */
if (dflag & GP_DRAWDATA_ONLY3D) {
if (no_xray) {
glDepthMask(mask_orig);
GPU_depth_test(false);
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)
{
const float alpha = 1.0f;
float color[4];
/* 1) Draw Previous Frames First */
copy_v3_v3(color, gpl->gcolor_prev);
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, gpl, gf, offsx, offsy, winx, winy, dflag,
gpl->thickness, color);
}
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, gpl, gpf->prev, offsx, offsy, winx, winy, dflag,
gpl->thickness, color);
}
}
else {
/* don't draw - disabled */
}
/* 2) Now draw next frames */
copy_v3_v3(color, gpl->gcolor_next);
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, gpl, gf, offsx, offsy, winx, winy, dflag,
gpl->thickness, color);
}
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, gpl, gpf->next, offsx, offsy, winx, winy, dflag,
gpl->thickness, color);
}
}
else {
/* don't draw - disabled */
}
}
/* loop over gpencil data layers, drawing them */
static void gp_draw_data_layers(
bGPdata *gpd, int offsx, int offsy, int winx, int winy,
int cfra, int dflag, float alpha)
{
float ink[4];
for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
short lthick = gpl->thickness;
/* apply layer opacity */
copy_v3_v3(ink, gpl->color);
ink[3] = gpl->opacity;
/* don't draw layer if hidden */
if (gpl->flag & GP_LAYER_HIDE)
continue;
/* get frame to draw */
bGPDframe *gpf = BKE_gpencil_layer_getframe(gpl, cfra, GP_GETFRAME_USE_PREV);
if (gpf == NULL)
continue;
/* set basic stroke thickness */
GPU_line_width(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
*/
/* xray... */
SET_FLAG_FROM_TEST(dflag, gpl->flag & GP_LAYER_NO_XRAY, GP_DRAWDATA_NO_XRAY);
/* Draw 'onionskins' (frame left + right) */
if (gpl->onion_flag & GP_LAYER_ONIONSKIN) {
gp_draw_onionskins(gpd, gpl, gpf, offsx, offsy, winx, winy, cfra, dflag);
}
/* draw the strokes already in active frame */
gp_draw_strokes(gpd, gpl, gpf, offsx, offsy, winx, winy, dflag, lthick, ink);
/* 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, gpl, gpf, offsx, offsy, winx, winy, dflag, gpl->flag, 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))
{
/* 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
*/
gp_draw_stroke_buffer(
gpd->runtime.sbuffer,
gpd->runtime.sbuffer_size, lthick,
dflag, gpd->runtime.sbuffer_sflag, ink);
}
}
}
/* draw a short status message in the top-right corner */
static void gp_draw_status_text(const 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 font_id = BLF_default();
BLF_width_and_height(font_id, printable, BLF_DRAW_STR_DUMMY_MAX, &printable_size[0], &printable_size[1]);
int xco = (rect.xmax - U.widget_unit) - (int)printable_size[0];
int yco = (rect.ymax - U.widget_unit);
/* text label */
UI_FontThemeColor(font_id, 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?
GPU_blend_set_func_separate(GPU_SRC_ALPHA, GPU_ONE_MINUS_SRC_ALPHA, GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA);
GPU_blend(true);
xco -= U.widget_unit;
yco -= (int)printable_size[1] / 2;
UI_icon_draw(xco, yco, ICON_GREASEPENCIL);
GPU_blend(false);
}
}
/* draw grease-pencil datablock */
static void gp_draw_data(
bGPdata *gpd, int offsx, int offsy, int winx, int winy,
int cfra, int dflag, float alpha)
{
/* turn on smooth lines (i.e. anti-aliasing) */
GPU_line_smooth(true);
/* turn on alpha-blending */
GPU_blend_set_func_separate(GPU_SRC_ALPHA, GPU_ONE_MINUS_SRC_ALPHA, GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA);
GPU_blend(true);
/* draw! */
gp_draw_data_layers(gpd, offsx, offsy, winx, winy, cfra, dflag, alpha);
/* turn off alpha blending, then smooth lines */
GPU_blend(false); // alpha blending
GPU_line_smooth(false); // smooth lines
}
/* 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;
float alpha = 1.0f;
if (scene) {
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) {
gp_draw_data(gpd_source, offsx, offsy, winx, winy, cfra, dflag, alpha);
}
}
/* 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)) {
gp_draw_data(gpd, offsx, offsy, winx, winy, cfra, dflag, alpha);
}
}
/* ----- 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);
int offsx, offsy, sizex, sizey;
int dflag = GP_DRAWDATA_NOSTATUS;
bGPdata *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=true to draw 'canvas' strokes,
* second time with onlyv2d=false 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);
int dflag = 0;
/* check that we have grease-pencil stuff to draw */
if (sa == NULL) return;
bGPdata *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) {
gp_draw_status_text(gpd, ar);
}
}
/* draw annotations sketches to specified 3d-view assuming that matrices are already set correctly
* Note: this gets called twice - first time with only3d=true to draw 3d-strokes,
* second time with only3d=false for screen-aligned strokes */
void ED_gpencil_draw_view3d_annotations(
Scene *scene, struct Depsgraph *depsgraph,
View3D *v3d, ARegion *ar,
bool only3d)
{
int dflag = 0;
RegionView3D *rv3d = ar->regiondata;
int offsx, offsy, winx, winy;
/* check that we have grease-pencil stuff to draw */
/* XXX: Hardcoded reference here may get out of sync if we change how we fetch annotation data */
bGPdata *gpd = scene->gpd;
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, depsgraph, 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;
}
/* draw it! */
gp_draw_data_all(scene, gpd, offsx, offsy, winx, winy, CFRA, dflag, v3d->spacetype);
}
/* ************************************************** */
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