1 files changed, 52 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/volumetric_geom.glsl b/source/blender/draw/engines/eevee/shaders/volumetric_geom.glsl
new file mode 100644
index 00000000000..208e8165689
--- /dev/null
+++ b/source/blender/draw/engines/eevee/shaders/volumetric_geom.glsl
@@ -0,0 +1,52 @@
+
+#ifdef MESH_SHADER
+/* TODO tight slices */
+layout(triangles) in;
+layout(triangle_strip, max_vertices=3) out;
+#else /* World */
+layout(triangles) in;
+layout(triangle_strip, max_vertices=3) out;
+#endif
+
+in vec4 vPos[];
+
+flat out int slice;
+
+#ifdef MESH_SHADER
+/* TODO tight slices */
+void main() {
+	gl_Layer = slice = int(vPos[0].z);
+
+	gl_Position = vPos[0].xyww;
+	EmitVertex();
+
+	gl_Position = vPos[1].xyww;
+	EmitVertex();
+
+	gl_Position = vPos[2].xyww;
+	EmitVertex();
+
+	EndPrimitive();
+}
+
+#else /* World */
+
+/* This is just a pass-through geometry shader that send the geometry
+ * to the layer corresponding to it's depth. */
+
+void main() {
+	gl_Layer = slice = int(vPos[0].z);
+
+	gl_Position = vPos[0].xyww;
+	EmitVertex();
+
+	gl_Position = vPos[1].xyww;
+	EmitVertex();
+
+	gl_Position = vPos[2].xyww;
+	EmitVertex();
+
+	EndPrimitive();
+}
+
+#endif