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#pragma BLENDER_REQUIRE(common_overlay_lib.glsl)
void do_vertex(
vec4 pos, float selection_fac, vec2 stipple_start, vec2 stipple_pos, float coord, vec2 offset)
{
geom_out.selectionFac = selection_fac;
geom_out.edgeCoord = coord;
geom_out.stippleStart = stipple_start;
geom_out.stipplePos = stipple_pos;
gl_Position = pos;
/* Multiply offset by 2 because gl_Position range is [-1..1]. */
gl_Position.xy += offset * 2.0;
EmitVertex();
}
void main()
{
vec2 ss_pos[2];
vec4 pos0 = gl_in[0].gl_Position;
vec4 pos1 = gl_in[1].gl_Position;
ss_pos[0] = pos0.xy / pos0.w;
ss_pos[1] = pos1.xy / pos1.w;
float half_size = sizeEdge;
/* Enlarge edge for outline drawing. */
/* Factor of 3.0 out of nowhere! Seems to fix issues with float imprecision. */
half_size += (lineStyle == OVERLAY_UV_LINE_STYLE_OUTLINE) ?
max(sizeEdge * (doSmoothWire ? 1.0 : 3.0), 1.0) :
0.0;
/* Add 1 px for AA */
if (doSmoothWire) {
half_size += 0.5;
}
vec2 line = ss_pos[0] - ss_pos[1];
vec2 line_dir = normalize(line);
vec2 line_perp = vec2(-line_dir.y, line_dir.x);
vec2 edge_ofs = line_perp * drw_view.viewport_size_inverse * ceil(half_size);
float selectFac0 = geom_in[0].selectionFac;
float selectFac1 = geom_in[1].selectionFac;
#ifdef USE_EDGE_SELECT
/* No blending with edge selection. */
selectFac1 = selectFac0;
#endif
do_vertex(
pos0, selectFac0, geom_in[0].stippleStart, geom_in[0].stipplePos, half_size, edge_ofs.xy);
do_vertex(
pos0, selectFac0, geom_in[0].stippleStart, geom_in[0].stipplePos, -half_size, -edge_ofs.xy);
do_vertex(
pos1, selectFac1, geom_in[1].stippleStart, geom_in[1].stipplePos, half_size, edge_ofs.xy);
do_vertex(
pos1, selectFac1, geom_in[1].stippleStart, geom_in[1].stipplePos, -half_size, -edge_ofs.xy);
EndPrimitive();
}
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