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Fix thin stroke issue for low resolutions

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This commit is contained in:
Grant Sanderson 2024-08-15 17:11:02 -05:00
parent df0ae6fdc9
commit 04347e7876
2 changed files with 7 additions and 8 deletions
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6
manimlib/shaders/quadratic_bezier_stroke/frag.glsl
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@ -2,16 +2,16 @@
// Value between -1 and 1 // Value between -1 and 1
in float scaled_signed_dist_to_curve; in float scaled_signed_dist_to_curve;
in float scaled_anti_alias_width; in float anti_alias_prop;
in vec4 color; in vec4 color;
out vec4 frag_color; out vec4 frag_color;
void main() { void main() {
if(scaled_anti_alias_width < 0) discard; if(anti_alias_prop < 0) discard;
frag_color = color; frag_color = color;
// sdf for the region around the curve we wish to color. // sdf for the region around the curve we wish to color.
float signed_dist_to_region = abs(scaled_signed_dist_to_curve) - 1.0; float signed_dist_to_region = abs(scaled_signed_dist_to_curve) - 1.0;
frag_color.a *= smoothstep(0, -scaled_anti_alias_width, signed_dist_to_region); frag_color.a *= smoothstep(0, -anti_alias_prop, signed_dist_to_region);
} }

9
manimlib/shaders/quadratic_bezier_stroke/geom.glsl
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@ -16,7 +16,7 @@ in float v_stroke_width[3];
in vec4 v_color[3]; in vec4 v_color[3];
out vec4 color; out vec4 color;
out float scaled_anti_alias_width; out float anti_alias_prop;
out float scaled_signed_dist_to_curve; out float scaled_signed_dist_to_curve;
// Codes for joint types // Codes for joint types
@ -167,9 +167,8 @@ void emit_point_with_width(
// Set styling // Set styling
color = finalize_color(joint_color, point, unit_normal); color = finalize_color(joint_color, point, unit_normal);
scaled_anti_alias_width = (width == 0) ? float aaw = anti_alias_width * pixel_size;
-1.0 : // Signal to discard in the frag shader anti_alias_prop = (width == 0) ? -1.0 : 2 * aaw / (width + 2 * aaw);
2.0 * anti_alias_width * pixel_size / width;
// Figure out the step from the point to the corners of the // Figure out the step from the point to the corners of the
// triangle strip around the polyline // triangle strip around the polyline
@ -180,7 +179,7 @@ void emit_point_with_width(
// reflecting where in the stroke that point is // reflecting where in the stroke that point is
for (int sign = -1; sign <= 1; sign += 2){ for (int sign = -1; sign <= 1; sign += 2){
scaled_signed_dist_to_curve = sign; scaled_signed_dist_to_curve = sign;
emit_gl_Position(point + 0.5 * width * sign * step); emit_gl_Position(point + 0.5 * (width + aaw) * sign * step);
EmitVertex(); EmitVertex();
} }
} }