1 files changed, 31 insertions, 0 deletions
diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_wireframe.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_wireframe.glsl
new file mode 100644
index 00000000000..2fcf1b8d914
--- /dev/null
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_wireframe.glsl
@@ -0,0 +1,31 @@
+#ifndef VOLUMETRICS
+void node_wireframe(float size, vec2 barycentric, vec3 barycentric_dist, out float fac)
+{
+  vec3 barys = barycentric.xyy;
+  barys.z = 1.0 - barycentric.x - barycentric.y;
+
+  size *= 0.5;
+  vec3 s = step(-size, -barys * barycentric_dist);
+
+  fac = max(s.x, max(s.y, s.z));
+}
+
+void node_wireframe_screenspace(float size, vec2 barycentric, out float fac)
+{
+  vec3 barys = barycentric.xyy;
+  barys.z = 1.0 - barycentric.x - barycentric.y;
+
+  size *= (1.0 / 3.0);
+  vec3 dx = dFdx(barys);
+  vec3 dy = dFdy(barys);
+  vec3 deltas = sqrt(dx * dx + dy * dy);
+
+  vec3 s = step(-deltas * size, -barys);
+
+  fac = max(s.x, max(s.y, s.z));
+}
+#else
+/* Stub wireframe because it is not compatible with volumetrics. */
+#  define node_wireframe
+#  define node_wireframe_screenspace
+#endif