diff options
author | Brecht Van Lommel <brechtvanlommel@pandora.be> | 2006-09-24 23:29:25 +0400 |
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committer | Brecht Van Lommel <brechtvanlommel@pandora.be> | 2006-09-24 23:29:25 +0400 |
commit | ef7200741beaf9df968e8e8e7ef6cfed5a51ccb3 (patch) | |
tree | 3dac4fed58960e9a857a7d1382661ea6eb771c51 /source/blender/blenkernel/intern/brush.c | |
parent | 7f7f35d1ca75885eec6c062f9af00e4d0f39dbd0 (diff) |
Basic pressure sensitivity support in imagepaint, for opacity, size,
falloff and spacing. Click the button labeled "P" next to the sliders.
Works best for opacity, other options can give poor quality strokes in
some cases. Also performance needs to be improved.
Remember, works only on X11 and Mac, no Windows support for tablets yet.
Diffstat (limited to 'source/blender/blenkernel/intern/brush.c')
-rw-r--r-- | source/blender/blenkernel/intern/brush.c | 66 |
1 files changed, 54 insertions, 12 deletions
diff --git a/source/blender/blenkernel/intern/brush.c b/source/blender/blenkernel/intern/brush.c index 5ade66e4566..36e8c2137cc 100644 --- a/source/blender/blenkernel/intern/brush.c +++ b/source/blender/blenkernel/intern/brush.c @@ -299,6 +299,13 @@ void brush_check_exists(Brush **brush) /* Brush Sampling */ +/*static float taylor_approx_cos(float f) +{ + f = f*f; + f = 1.0f - f/2.0f + f*f/24.0f; + return f; +}*/ + float brush_sample_falloff(Brush *brush, float dist) { float a, outer, inner; @@ -310,10 +317,12 @@ float brush_sample_falloff(Brush *brush, float dist) return brush->alpha; } else if ((dist < outer) && (inner < outer)) { - /* formula used by sculpt: - 0.5f * (cos(3*(dist - inner)/(outer - inner)) + 1); */ a = sqrt((dist - inner)/(outer - inner)); return (1 - a)*brush->alpha; + + /* formula used by sculpt, with taylor approx + a = 0.5f*(taylor_approx_cos(3.0f*(dist - inner)/(outer - inner)) + 1.0f); + return a*brush->alpha; */ } else return 0.0f; @@ -470,6 +479,8 @@ struct BrushPainter { double accumtime; /* accumulated time since last paint op (airbrush) */ double lasttime; /* time of last update */ + float lastpressure; + short firsttouch; /* first paint op */ float startsize; @@ -720,24 +731,37 @@ void brush_painter_break_stroke(BrushPainter *painter) painter->firsttouch= 1; } -int brush_painter_paint(BrushPainter *painter, BrushFunc func, float *pos, double time, void *user) +static void brush_apply_pressure(BrushPainter *painter, Brush *brush, float pressure) +{ + if (brush->flag & BRUSH_ALPHA_PRESSURE) + brush->alpha = MAX2(0.0, painter->startalpha*pressure); + if (brush->flag & BRUSH_SIZE_PRESSURE) + brush->size = MAX2(1.0, painter->startsize*pressure); + if (brush->flag & BRUSH_RAD_PRESSURE) + brush->innerradius = MAX2(0.0, painter->startinnerradius*pressure); + if (brush->flag & BRUSH_SPACING_PRESSURE) + brush->spacing = MAX2(1.0, painter->startspacing*(1.5f-pressure)); +} + +int brush_painter_paint(BrushPainter *painter, BrushFunc func, float *pos, double time, float pressure, void *user) { Brush *brush= painter->brush; int totpaintops= 0; + if (pressure == 0.0f) + pressure = 1.0f; /* zero pressure == not using tablet */ + if (painter->firsttouch) { /* paint exactly once on first touch */ painter->startpaintpos[0]= pos[0]; painter->startpaintpos[1]= pos[1]; + brush_apply_pressure(painter, brush, pressure); if (painter->cache.enabled) brush_painter_refresh_cache(painter, pos); totpaintops += func(user, painter->cache.ibuf, pos, pos); - painter->lastpaintpos[0]= pos[0]; - painter->lastpaintpos[1]= pos[1]; painter->lasttime= time; - painter->firsttouch= 0; } #if 0 @@ -760,8 +784,10 @@ int brush_painter_paint(BrushPainter *painter, BrushFunc func, float *pos, doubl paintpos[0]= painter->lastmousepos[0] + dmousepos[0]*step; paintpos[1]= painter->lastmousepos[1] + dmousepos[1]*step; - if (painter->cache.enabled) brush_painter_refresh_cache(painter); - totpaintops += func(user, painter->cache.ibuf, painter->lastpaintpos, paintpos); + if (painter->cache.enabled) + brush_painter_refresh_cache(painter); + totpaintops += func(user, painter->cache.ibuf, + painter->lastpaintpos, paintpos); painter->lastpaintpos[0]= paintpos[0]; painter->lastpaintpos[1]= paintpos[1]; @@ -774,15 +800,18 @@ int brush_painter_paint(BrushPainter *painter, BrushFunc func, float *pos, doubl #endif else { float startdistance, spacing, step, paintpos[2], dmousepos[2]; - float brushsize = MAX2(1.0, brush->size); + float t, len, press; - /* compute brush spacing adapted to brush size */ - spacing= brushsize*brush->spacing*0.01f; + /* compute brush spacing adapted to brush size, spacing may depend + on pressure, so update it */ + brush_apply_pressure(painter, brush, painter->lastpressure); + spacing= MAX2(1.0, brush->size)*brush->spacing*0.01f; /* setup starting distance, direction vector and accumulated distance */ startdistance= painter->accumdistance; Vec2Subf(dmousepos, pos, painter->lastmousepos); - painter->accumdistance += Normalise2(dmousepos); + len= Normalise2(dmousepos); + painter->accumdistance += len; /* do paint op over unpainted distance */ while (painter->accumdistance >= spacing) { @@ -790,8 +819,14 @@ int brush_painter_paint(BrushPainter *painter, BrushFunc func, float *pos, doubl paintpos[0]= painter->lastmousepos[0] + dmousepos[0]*step; paintpos[1]= painter->lastmousepos[1] + dmousepos[1]*step; + t = step/len; + press= (1.0-t)*painter->lastpressure + t*pressure; + brush_apply_pressure(painter, brush, press); + spacing= MAX2(1.0, brush->size)*brush->spacing*0.01f; + if (painter->cache.enabled) brush_painter_refresh_cache(painter, paintpos); + totpaintops += func(user, painter->cache.ibuf, painter->lastpaintpos, paintpos); @@ -815,6 +850,7 @@ int brush_painter_paint(BrushPainter *painter, BrushFunc func, float *pos, doubl painter->accumtime -= painttime; while (painter->accumtime >= brush->rate) { + brush_apply_pressure(painter, brush, pressure); if (painter->cache.enabled) brush_painter_refresh_cache(painter, paintpos); totpaintops += @@ -828,6 +864,12 @@ int brush_painter_paint(BrushPainter *painter, BrushFunc func, float *pos, doubl painter->lastmousepos[0]= pos[0]; painter->lastmousepos[1]= pos[1]; + painter->lastpressure= pressure; + + brush->alpha = painter->startalpha; + brush->size = painter->startsize; + brush->innerradius = painter->startinnerradius; + brush->spacing = painter->startspacing; return totpaintops; } |