Water is in ECS; water material is created in code

water/depth.frag

@@ -0,0 +1,14 @@
+OGRE_NATIVE_GLSL_VERSION_DIRECTIVE
+#include <OgreUnifiedShader.h>
+
+OGRE_UNIFORMS(
+uniform vec3 cameraPosition;
+)
+MAIN_PARAMETERS
+IN(vec4 position, POSITION)
+IN(vec3 positionWS, TEXCOORD0)
+MAIN_DECLARATION
+{
+	vec4 depth = vec4(length(positionWS - cameraPosition), 0.0, 0.0, 1.0);
+	gl_FragColor = depth;
+}