1 files changed, 23 insertions, 0 deletions
diff --git a/source/blender/draw/engines/overlay/shaders/overlay_particle_frag.glsl b/source/blender/draw/engines/overlay/shaders/overlay_particle_frag.glsl
new file mode 100644
index 00000000000..a2bcca7b820
--- /dev/null
+++ b/source/blender/draw/engines/overlay/shaders/overlay_particle_frag.glsl
@@ -0,0 +1,23 @@
+
+#pragma BLENDER_REQUIRE(common_view_lib.glsl)
+
+void main()
+{
+  vec2 uv = gl_PointCoord - vec2(0.5);
+  float dist = length(uv);
+
+  if (dist > 0.5) {
+    discard;
+  }
+  /* Nice sphere falloff. */
+  float intensity = sqrt(1.0 - dist * 2.0) * 0.5 + 0.5;
+  fragColor = finalColor * vec4(intensity, intensity, intensity, 1.0);
+
+  /* The default value of GL_POINT_SPRITE_COORD_ORIGIN is GL_UPPER_LEFT. Need to reverse the Y. */
+  uv.y = -uv.y;
+  /* Subtract distance to outer edge of the circle. (0.75 is manually tweaked to look better) */
+  vec2 edge_pos = gl_FragCoord.xy - uv * (0.75 / (dist + 1e-9));
+  vec2 edge_start = edge_pos + vec2(-uv.y, uv.x);
+
+  lineOutput = pack_line_data(gl_FragCoord.xy, edge_start, edge_pos);
+}