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blender-archive/source/blender/blenkernel/intern/brush.c
Antonis Ryakiotakis 59893d9d5b Code cleanup: 
Separate 2D painting functions away from brush.c, which should implement
the brush API and into its own file, paint_2D.c.
Ideally projective texturing and 2D painting should be totally separate,
however functionality is still interleaved mostly in the
BKE_brush_painter_paint function. The functionality of this function can
possibly be done using the brush stroke functions instead.
2013-01-01 21:23:12 +00:00

830 lines
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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) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/blenkernel/intern/brush.c
* \ingroup bke
*/
#include "MEM_guardedalloc.h"
#include "DNA_brush_types.h"
#include "DNA_scene_types.h"
#include "DNA_object_types.h"
#include "BLI_math.h"
#include "BLI_blenlib.h"
#include "BLI_rand.h"
#include "BKE_brush.h"
#include "BKE_colortools.h"
#include "BKE_global.h"
#include "BKE_image.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "BKE_paint.h"
#include "BKE_texture.h"
#include "BKE_icons.h"
#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"
#include "RE_render_ext.h" /* externtex */
static void brush_defaults(Brush *brush)
{
brush->blend = 0;
brush->flag = 0;
brush->ob_mode = OB_MODE_ALL_PAINT;
/* BRUSH SCULPT TOOL SETTINGS */
brush->weight = 1.0f; /* weight of brush 0 - 1.0 */
brush->size = 35; /* radius of the brush in pixels */
brush->alpha = 0.5f; /* brush strength/intensity probably variable should be renamed? */
brush->autosmooth_factor = 0.0f;
brush->crease_pinch_factor = 0.5f;
brush->sculpt_plane = SCULPT_DISP_DIR_AREA;
brush->plane_offset = 0.0f; /* how far above or below the plane that is found by averaging the faces */
brush->plane_trim = 0.5f;
brush->clone.alpha = 0.5f;
brush->normal_weight = 0.0f;
brush->flag |= BRUSH_ALPHA_PRESSURE;
/* BRUSH PAINT TOOL SETTINGS */
brush->rgb[0] = 1.0f; /* default rgb color of the brush when painting - white */
brush->rgb[1] = 1.0f;
brush->rgb[2] = 1.0f;
/* BRUSH STROKE SETTINGS */
brush->flag |= (BRUSH_SPACE | BRUSH_SPACE_ATTEN);
brush->spacing = 10; /* how far each brush dot should be spaced as a percentage of brush diameter */
brush->smooth_stroke_radius = 75;
brush->smooth_stroke_factor = 0.9f;
brush->rate = 0.1f; /* time delay between dots of paint or sculpting when doing airbrush mode */
brush->jitter = 0.0f;
/* BRUSH TEXTURE SETTINGS */
default_mtex(&brush->mtex);
brush->texture_sample_bias = 0; /* value to added to texture samples */
brush->texture_overlay_alpha = 33;
/* brush appearance */
brush->add_col[0] = 1.00; /* add mode color is light red */
brush->add_col[1] = 0.39;
brush->add_col[2] = 0.39;
brush->sub_col[0] = 0.39; /* subtract mode color is light blue */
brush->sub_col[1] = 0.39;
brush->sub_col[2] = 1.00;
}
/* Datablock add/copy/free/make_local */
Brush *BKE_brush_add(const char *name)
{
Brush *brush;
brush = BKE_libblock_alloc(&G.main->brush, ID_BR, name);
/* enable fake user by default */
brush->id.flag |= LIB_FAKEUSER;
brush_defaults(brush);
brush->sculpt_tool = SCULPT_TOOL_DRAW; /* sculpting defaults to the draw tool for new brushes */
/* the default alpha falloff curve */
BKE_brush_curve_preset(brush, CURVE_PRESET_SMOOTH);
return brush;
}
Brush *BKE_brush_copy(Brush *brush)
{
Brush *brushn;
brushn = BKE_libblock_copy(&brush->id);
if (brush->mtex.tex)
id_us_plus((ID *)brush->mtex.tex);
if (brush->icon_imbuf)
brushn->icon_imbuf = IMB_dupImBuf(brush->icon_imbuf);
brushn->preview = NULL;
brushn->curve = curvemapping_copy(brush->curve);
/* enable fake user by default */
if (!(brushn->id.flag & LIB_FAKEUSER)) {
brushn->id.flag |= LIB_FAKEUSER;
brushn->id.us++;
}
return brushn;
}
/* not brush itself */
void BKE_brush_free(Brush *brush)
{
if (brush->mtex.tex)
brush->mtex.tex->id.us--;
if (brush->icon_imbuf)
IMB_freeImBuf(brush->icon_imbuf);
BKE_previewimg_free(&(brush->preview));
curvemapping_free(brush->curve);
}
static void extern_local_brush(Brush *brush)
{
id_lib_extern((ID *)brush->mtex.tex);
id_lib_extern((ID *)brush->clone.image);
}
void BKE_brush_make_local(Brush *brush)
{
/* - only lib users: do nothing
* - only local users: set flag
* - mixed: make copy
*/
Main *bmain = G.main;
Scene *scene;
int is_local = FALSE, is_lib = FALSE;
if (brush->id.lib == NULL) return;
if (brush->clone.image) {
/* special case: ima always local immediately. Clone image should only
* have one user anyway. */
id_clear_lib_data(bmain, &brush->clone.image->id);
extern_local_brush(brush);
}
for (scene = bmain->scene.first; scene && ELEM(0, is_lib, is_local); scene = scene->id.next) {
if (paint_brush(&scene->toolsettings->imapaint.paint) == brush) {
if (scene->id.lib) is_lib = TRUE;
else is_local = TRUE;
}
}
if (is_local && is_lib == FALSE) {
id_clear_lib_data(bmain, &brush->id);
extern_local_brush(brush);
/* enable fake user by default */
if (!(brush->id.flag & LIB_FAKEUSER)) {
brush->id.flag |= LIB_FAKEUSER;
brush->id.us++;
}
}
else if (is_local && is_lib) {
Brush *brush_new = BKE_brush_copy(brush);
brush_new->id.us = 1; /* only keep fake user */
brush_new->id.flag |= LIB_FAKEUSER;
/* Remap paths of new ID using old library as base. */
BKE_id_lib_local_paths(bmain, brush->id.lib, &brush_new->id);
for (scene = bmain->scene.first; scene; scene = scene->id.next) {
if (paint_brush(&scene->toolsettings->imapaint.paint) == brush) {
if (scene->id.lib == NULL) {
paint_brush_set(&scene->toolsettings->imapaint.paint, brush_new);
}
}
}
}
}
void BKE_brush_debug_print_state(Brush *br)
{
/* create a fake brush and set it to the defaults */
Brush def = {{NULL}};
brush_defaults(&def);
#define BR_TEST(field, t) \
if (br->field != def.field) \
printf("br->" #field " = %" #t ";\n", br->field)
#define BR_TEST_FLAG(_f) \
if ((br->flag & _f) && !(def.flag & _f)) \
printf("br->flag |= " #_f ";\n"); \
else if (!(br->flag & _f) && (def.flag & _f)) \
printf("br->flag &= ~" #_f ";\n")
/* print out any non-default brush state */
BR_TEST(normal_weight, f);
BR_TEST(blend, d);
BR_TEST(size, d);
/* br->flag */
BR_TEST_FLAG(BRUSH_AIRBRUSH);
BR_TEST_FLAG(BRUSH_TORUS);
BR_TEST_FLAG(BRUSH_ALPHA_PRESSURE);
BR_TEST_FLAG(BRUSH_SIZE_PRESSURE);
BR_TEST_FLAG(BRUSH_JITTER_PRESSURE);
BR_TEST_FLAG(BRUSH_SPACING_PRESSURE);
BR_TEST_FLAG(BRUSH_FIXED_TEX);
BR_TEST_FLAG(BRUSH_RAKE);
BR_TEST_FLAG(BRUSH_ANCHORED);
BR_TEST_FLAG(BRUSH_DIR_IN);
BR_TEST_FLAG(BRUSH_SPACE);
BR_TEST_FLAG(BRUSH_SMOOTH_STROKE);
BR_TEST_FLAG(BRUSH_PERSISTENT);
BR_TEST_FLAG(BRUSH_ACCUMULATE);
BR_TEST_FLAG(BRUSH_LOCK_ALPHA);
BR_TEST_FLAG(BRUSH_ORIGINAL_NORMAL);
BR_TEST_FLAG(BRUSH_OFFSET_PRESSURE);
BR_TEST_FLAG(BRUSH_SPACE_ATTEN);
BR_TEST_FLAG(BRUSH_ADAPTIVE_SPACE);
BR_TEST_FLAG(BRUSH_LOCK_SIZE);
BR_TEST_FLAG(BRUSH_TEXTURE_OVERLAY);
BR_TEST_FLAG(BRUSH_EDGE_TO_EDGE);
BR_TEST_FLAG(BRUSH_RESTORE_MESH);
BR_TEST_FLAG(BRUSH_INVERSE_SMOOTH_PRESSURE);
BR_TEST_FLAG(BRUSH_RANDOM_ROTATION);
BR_TEST_FLAG(BRUSH_PLANE_TRIM);
BR_TEST_FLAG(BRUSH_FRONTFACE);
BR_TEST_FLAG(BRUSH_CUSTOM_ICON);
BR_TEST(jitter, f);
BR_TEST(spacing, d);
BR_TEST(smooth_stroke_radius, d);
BR_TEST(smooth_stroke_factor, f);
BR_TEST(rate, f);
BR_TEST(alpha, f);
BR_TEST(sculpt_plane, d);
BR_TEST(plane_offset, f);
BR_TEST(autosmooth_factor, f);
BR_TEST(crease_pinch_factor, f);
BR_TEST(plane_trim, f);
BR_TEST(texture_sample_bias, f);
BR_TEST(texture_overlay_alpha, d);
BR_TEST(add_col[0], f);
BR_TEST(add_col[1], f);
BR_TEST(add_col[2], f);
BR_TEST(sub_col[0], f);
BR_TEST(sub_col[1], f);
BR_TEST(sub_col[2], f);
printf("\n");
#undef BR_TEST
#undef BR_TEST_FLAG
}
void BKE_brush_sculpt_reset(Brush *br)
{
/* enable this to see any non-default
* settings used by a brush: */
// BKE_brush_debug_print_state(br);
brush_defaults(br);
BKE_brush_curve_preset(br, CURVE_PRESET_SMOOTH);
switch (br->sculpt_tool) {
case SCULPT_TOOL_CLAY:
br->flag |= BRUSH_FRONTFACE;
break;
case SCULPT_TOOL_CREASE:
br->flag |= BRUSH_DIR_IN;
br->alpha = 0.25;
break;
case SCULPT_TOOL_FILL:
br->add_col[1] = 1;
br->sub_col[0] = 0.25;
br->sub_col[1] = 1;
break;
case SCULPT_TOOL_FLATTEN:
br->add_col[1] = 1;
br->sub_col[0] = 0.25;
br->sub_col[1] = 1;
break;
case SCULPT_TOOL_INFLATE:
br->add_col[0] = 0.750000;
br->add_col[1] = 0.750000;
br->add_col[2] = 0.750000;
br->sub_col[0] = 0.250000;
br->sub_col[1] = 0.250000;
br->sub_col[2] = 0.250000;
break;
case SCULPT_TOOL_NUDGE:
br->add_col[0] = 0.250000;
br->add_col[1] = 1.000000;
br->add_col[2] = 0.250000;
break;
case SCULPT_TOOL_PINCH:
br->add_col[0] = 0.750000;
br->add_col[1] = 0.750000;
br->add_col[2] = 0.750000;
br->sub_col[0] = 0.250000;
br->sub_col[1] = 0.250000;
br->sub_col[2] = 0.250000;
break;
case SCULPT_TOOL_SCRAPE:
br->add_col[1] = 1.000000;
br->sub_col[0] = 0.250000;
br->sub_col[1] = 1.000000;
break;
case SCULPT_TOOL_ROTATE:
br->alpha = 1.0;
break;
case SCULPT_TOOL_SMOOTH:
br->flag &= ~BRUSH_SPACE_ATTEN;
br->spacing = 5;
br->add_col[0] = 0.750000;
br->add_col[1] = 0.750000;
br->add_col[2] = 0.750000;
break;
case SCULPT_TOOL_GRAB:
case SCULPT_TOOL_SNAKE_HOOK:
case SCULPT_TOOL_THUMB:
br->size = 75;
br->flag &= ~BRUSH_ALPHA_PRESSURE;
br->flag &= ~BRUSH_SPACE;
br->flag &= ~BRUSH_SPACE_ATTEN;
br->add_col[0] = 0.250000;
br->add_col[1] = 1.000000;
br->add_col[2] = 0.250000;
break;
default:
break;
}
}
/* Library Operations */
void BKE_brush_curve_preset(Brush *b, /*CurveMappingPreset*/ int preset)
{
CurveMap *cm = NULL;
if (!b->curve)
b->curve = curvemapping_add(1, 0, 0, 1, 1);
cm = b->curve->cm;
cm->flag &= ~CUMA_EXTEND_EXTRAPOLATE;
b->curve->preset = preset;
curvemap_reset(cm, &b->curve->clipr, b->curve->preset, CURVEMAP_SLOPE_NEGATIVE);
curvemapping_changed(b->curve, FALSE);
}
int BKE_brush_texture_set_nr(Brush *brush, int nr)
{
ID *idtest, *id = NULL;
id = (ID *)brush->mtex.tex;
idtest = (ID *)BLI_findlink(&G.main->tex, nr - 1);
if (idtest == NULL) { /* new tex */
if (id) idtest = (ID *)BKE_texture_copy((Tex *)id);
else idtest = (ID *)add_texture("Tex");
idtest->us--;
}
if (idtest != id) {
BKE_brush_texture_delete(brush);
brush->mtex.tex = (Tex *)idtest;
id_us_plus(idtest);
return 1;
}
return 0;
}
int BKE_brush_texture_delete(Brush *brush)
{
if (brush->mtex.tex)
brush->mtex.tex->id.us--;
return 1;
}
int BKE_brush_clone_image_set_nr(Brush *brush, int nr)
{
if (brush && nr > 0) {
Image *ima = (Image *)BLI_findlink(&G.main->image, nr - 1);
if (ima) {
BKE_brush_clone_image_delete(brush);
brush->clone.image = ima;
id_us_plus(&ima->id);
brush->clone.offset[0] = brush->clone.offset[1] = 0.0f;
return 1;
}
}
return 0;
}
int BKE_brush_clone_image_delete(Brush *brush)
{
if (brush && brush->clone.image) {
brush->clone.image->id.us--;
brush->clone.image = NULL;
return 1;
}
return 0;
}
/* Brush Sampling */
void BKE_brush_sample_tex(const Scene *scene, Brush *brush, const float xy[2], float rgba[4], const int thread)
{
MTex *mtex = &brush->mtex;
if (mtex && mtex->tex) {
float co[3], tin, tr, tg, tb, ta;
int hasrgb;
const int radius = BKE_brush_size_get(scene, brush);
co[0] = xy[0] / radius;
co[1] = xy[1] / radius;
co[2] = 0.0f;
hasrgb = externtex(mtex, co, &tin, &tr, &tg, &tb, &ta, thread);
if (hasrgb) {
rgba[0] = tr;
rgba[1] = tg;
rgba[2] = tb;
rgba[3] = ta;
}
else {
rgba[0] = tin;
rgba[1] = tin;
rgba[2] = tin;
rgba[3] = 1.0f;
}
}
else {
rgba[0] = rgba[1] = rgba[2] = rgba[3] = 1.0f;
}
}
/* TODO, use define for 'texfall' arg */
void BKE_brush_imbuf_new(const Scene *scene, Brush *brush, short flt, short texfall, int bufsize, ImBuf **outbuf, int use_color_correction)
{
ImBuf *ibuf;
float xy[2], rgba[4], *dstf;
int x, y, rowbytes, xoff, yoff, imbflag;
const int radius = BKE_brush_size_get(scene, brush);
unsigned char *dst, crgb[3];
const float alpha = BKE_brush_alpha_get(scene, brush);
float brush_rgb[3];
imbflag = (flt) ? IB_rectfloat : IB_rect;
xoff = -bufsize / 2.0f + 0.5f;
yoff = -bufsize / 2.0f + 0.5f;
rowbytes = bufsize * 4;
if (*outbuf)
ibuf = *outbuf;
else
ibuf = IMB_allocImBuf(bufsize, bufsize, 32, imbflag);
if (flt) {
copy_v3_v3(brush_rgb, brush->rgb);
if (use_color_correction) {
srgb_to_linearrgb_v3_v3(brush_rgb, brush_rgb);
}
for (y = 0; y < ibuf->y; y++) {
dstf = ibuf->rect_float + y * rowbytes;
for (x = 0; x < ibuf->x; x++, dstf += 4) {
xy[0] = x + xoff;
xy[1] = y + yoff;
if (texfall == 0) {
copy_v3_v3(dstf, brush_rgb);
dstf[3] = alpha * BKE_brush_curve_strength_clamp(brush, len_v2(xy), radius);
}
else if (texfall == 1) {
BKE_brush_sample_tex(scene, brush, xy, dstf, 0);
}
else {
BKE_brush_sample_tex(scene, brush, xy, rgba, 0);
mul_v3_v3v3(dstf, rgba, brush_rgb);
dstf[3] = rgba[3] * alpha * BKE_brush_curve_strength_clamp(brush, len_v2(xy), radius);
}
}
}
}
else {
float alpha_f; /* final float alpha to convert to char */
rgb_float_to_uchar(crgb, brush->rgb);
for (y = 0; y < ibuf->y; y++) {
dst = (unsigned char *)ibuf->rect + y * rowbytes;
for (x = 0; x < ibuf->x; x++, dst += 4) {
xy[0] = x + xoff;
xy[1] = y + yoff;
if (texfall == 0) {
alpha_f = alpha * BKE_brush_curve_strength(brush, len_v2(xy), radius);
dst[0] = crgb[0];
dst[1] = crgb[1];
dst[2] = crgb[2];
dst[3] = FTOCHAR(alpha_f);
}
else if (texfall == 1) {
BKE_brush_sample_tex(scene, brush, xy, rgba, 0);
rgba_float_to_uchar(dst, rgba);
}
else if (texfall == 2) {
BKE_brush_sample_tex(scene, brush, xy, rgba, 0);
mul_v3_v3(rgba, brush->rgb);
alpha_f = rgba[3] * alpha * BKE_brush_curve_strength_clamp(brush, len_v2(xy), radius);
rgb_float_to_uchar(dst, rgba);
dst[3] = FTOCHAR(alpha_f);
}
else {
BKE_brush_sample_tex(scene, brush, xy, rgba, 0);
alpha_f = rgba[3] * alpha * BKE_brush_curve_strength_clamp(brush, len_v2(xy), radius);
dst[0] = crgb[0];
dst[1] = crgb[1];
dst[2] = crgb[2];
dst[3] = FTOCHAR(alpha_f);
}
}
}
}
*outbuf = ibuf;
}
/* Unified Size and Strength */
/* XXX: be careful about setting size and unprojected radius
* because they depend on one another
* these functions do not set the other corresponding value
* this can lead to odd behavior if size and unprojected
* radius become inconsistent.
* the biggest problem is that it isn't possible to change
* unprojected radius because a view context is not
* available. my ussual solution to this is to use the
* ratio of change of the size to change the unprojected
* radius. Not completely convinced that is correct.
* In anycase, a better solution is needed to prevent
* inconsistency. */
void BKE_brush_size_set(Scene *scene, Brush *brush, int size)
{
UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
if (ups->flag & UNIFIED_PAINT_SIZE)
ups->size = size;
else
brush->size = size;
}
int BKE_brush_size_get(const Scene *scene, Brush *brush)
{
UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
int size = (ups->flag & UNIFIED_PAINT_SIZE) ? ups->size : brush->size;
return (int)((float)size * U.pixelsize);
}
int BKE_brush_use_locked_size(const Scene *scene, Brush *brush)
{
const short us_flag = scene->toolsettings->unified_paint_settings.flag;
return (us_flag & UNIFIED_PAINT_SIZE) ?
(us_flag & UNIFIED_PAINT_BRUSH_LOCK_SIZE) :
(brush->flag & BRUSH_LOCK_SIZE);
}
int BKE_brush_use_size_pressure(const Scene *scene, Brush *brush)
{
const short us_flag = scene->toolsettings->unified_paint_settings.flag;
return (us_flag & UNIFIED_PAINT_SIZE) ?
(us_flag & UNIFIED_PAINT_BRUSH_SIZE_PRESSURE) :
(brush->flag & BRUSH_SIZE_PRESSURE);
}
int BKE_brush_use_alpha_pressure(const Scene *scene, Brush *brush)
{
const short us_flag = scene->toolsettings->unified_paint_settings.flag;
return (us_flag & UNIFIED_PAINT_ALPHA) ?
(us_flag & UNIFIED_PAINT_BRUSH_ALPHA_PRESSURE) :
(brush->flag & BRUSH_ALPHA_PRESSURE);
}
void BKE_brush_unprojected_radius_set(Scene *scene, Brush *brush, float unprojected_radius)
{
UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
if (ups->flag & UNIFIED_PAINT_SIZE)
ups->unprojected_radius = unprojected_radius;
else
brush->unprojected_radius = unprojected_radius;
}
float BKE_brush_unprojected_radius_get(const Scene *scene, Brush *brush)
{
UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
return (ups->flag & UNIFIED_PAINT_SIZE) ?
ups->unprojected_radius :
brush->unprojected_radius;
}
void BKE_brush_alpha_set(Scene *scene, Brush *brush, float alpha)
{
UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
if (ups->flag & UNIFIED_PAINT_ALPHA)
ups->alpha = alpha;
else
brush->alpha = alpha;
}
float BKE_brush_alpha_get(const Scene *scene, Brush *brush)
{
UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
return (ups->flag & UNIFIED_PAINT_ALPHA) ? ups->alpha : brush->alpha;
}
float BKE_brush_weight_get(const Scene *scene, Brush *brush)
{
UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
return (ups->flag & UNIFIED_PAINT_WEIGHT) ? ups->weight : brush->weight;
}
void BKE_brush_weight_set(const Scene *scene, Brush *brush, float value)
{
UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
if (ups->flag & UNIFIED_PAINT_WEIGHT)
ups->weight = value;
else
brush->weight = value;
}
/* scale unprojected radius to reflect a change in the brush's 2D size */
void BKE_brush_scale_unprojected_radius(float *unprojected_radius,
int new_brush_size,
int old_brush_size)
{
float scale = new_brush_size;
/* avoid division by zero */
if (old_brush_size != 0)
scale /= (float)old_brush_size;
(*unprojected_radius) *= scale;
}
/* scale brush size to reflect a change in the brush's unprojected radius */
void BKE_brush_scale_size(int *r_brush_size,
float new_unprojected_radius,
float old_unprojected_radius)
{
float scale = new_unprojected_radius;
/* avoid division by zero */
if (old_unprojected_radius != 0)
scale /= new_unprojected_radius;
(*r_brush_size) = (int)((float)(*r_brush_size) * scale);
}
void BKE_brush_jitter_pos(const Scene *scene, Brush *brush, const float pos[2], float jitterpos[2])
{
int use_jitter = brush->jitter != 0;
/* jitter-ed brush gives weird and unpredictable result for this
* kinds of stroke, so manually disable jitter usage (sergey) */
use_jitter &= (brush->flag & (BRUSH_RESTORE_MESH | BRUSH_ANCHORED)) == 0;
if (use_jitter) {
float rand_pos[2];
const int radius = BKE_brush_size_get(scene, brush);
const int diameter = 2 * radius;
/* find random position within a circle of diameter 1 */
do {
rand_pos[0] = BLI_frand() - 0.5f;
rand_pos[1] = BLI_frand() - 0.5f;
} while (len_v2(rand_pos) > 0.5f);
jitterpos[0] = pos[0] + 2 * rand_pos[0] * diameter * brush->jitter;
jitterpos[1] = pos[1] + 2 * rand_pos[1] * diameter * brush->jitter;
}
else {
copy_v2_v2(jitterpos, pos);
}
}
/* Uses the brush curve control to find a strength value between 0 and 1 */
float BKE_brush_curve_strength_clamp(Brush *br, float p, const float len)
{
if (p >= len) return 0;
else p = p / len;
curvemapping_initialize(br->curve);
p = curvemapping_evaluateF(br->curve, 0, p);
if (p < 0.0f) p = 0.0f;
else if (p > 1.0f) p = 1.0f;
return p;
}
/* same as above but can return negative values if the curve enables
* used for sculpt only */
float BKE_brush_curve_strength(Brush *br, float p, const float len)
{
if (p >= len)
p = 1.0f;
else
p = p / len;
curvemapping_initialize(br->curve);
return curvemapping_evaluateF(br->curve, 0, p);
}
/**** Radial Control ****/
struct ImBuf *BKE_brush_gen_radial_control_imbuf(Brush *br)
{
ImBuf *im = MEM_callocN(sizeof(ImBuf), "radial control texture");
unsigned int *texcache;
int side = 128;
int half = side / 2;
int i, j;
texcache = BKE_brush_gen_texture_cache(br, half);
im->rect_float = MEM_callocN(sizeof(float) * side * side, "radial control rect");
im->x = im->y = side;
for (i = 0; i < side; ++i) {
for (j = 0; j < side; ++j) {
float magn = sqrtf(powf(i - half, 2) + powf(j - half, 2));
im->rect_float[i * side + j] = BKE_brush_curve_strength_clamp(br, magn, half);
}
}
/* Modulate curve with texture */
if (texcache) {
for (i = 0; i < side; ++i) {
for (j = 0; j < side; ++j) {
const int col = texcache[i * side + j];
im->rect_float[i * side + j] *= (((char *)&col)[0] + ((char *)&col)[1] + ((char *)&col)[2]) / 3.0f / 255.0f;
}
}
MEM_freeN(texcache);
}
return im;
}
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