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OpenGL does not like line thickness less than 1.0. 

Check here is not completely correct either, we should check against
GL_ALIASED_LINE_WIDTH_RANGE and GL_SMOOTH_LINE_WIDTH_RANGE
This commit is contained in:
Antonis Ryakiotakis 2015-04-16 18:34:53 +02:00
parent 6589d07c8f
commit a7cae2987d
Notes: blender-bot 2023-02-14 10:54:29 +01:00 
Referenced by issue #44932, Grease Pencil: In the line-drawing mode a tablet pen produces non-deterministic line with.
1 changed files with 4 additions and 4 deletions
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8
source/blender/editors/gpencil/drawgpencil.c
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@ -121,7 +121,7 @@ static void gp_draw_stroke_buffer(tGPspoint *points, int totpoints, short thickn
/* draw stroke curve */
if (G.debug & G_DEBUG) setlinestyle(2);
glLineWidth(oldpressure * thickness);
glLineWidth(max_ff(oldpressure * thickness, 1.0));
glBegin(GL_LINE_STRIP);
for (i = 0, pt = points; i < totpoints && pt; i++, pt++) {
@ -130,7 +130,7 @@ static void gp_draw_stroke_buffer(tGPspoint *points, int totpoints, short thickn
*/
if (fabsf(pt->pressure - oldpressure) > 0.2f) {
glEnd();
glLineWidth(pt->pressure * thickness);
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 */
@ -415,7 +415,7 @@ static void gp_draw_stroke_3d(bGPDspoint *points, int totpoints, short thickness
int i;
/* draw stroke curve */
glLineWidth(curpressure * thickness);
glLineWidth(max_ff(curpressure * thickness, 1.0f));
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,
@ -425,7 +425,7 @@ static void gp_draw_stroke_3d(bGPDspoint *points, int totpoints, short thickness
if (fabsf(pt->pressure - curpressure) > 0.2f / (float)thickness) {
glEnd();
curpressure = pt->pressure;
glLineWidth(curpressure * thickness);
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 */