Round depth in the fragment shader. Simpler alternative to #7920 but will not work on ES 2.0, and will in many cases be slower.

So possibly this could be an option for modern devices, and possibly for games that #7920 can't fix.

GPU/GLES/FragmentShaderGenerator.cpp

@@ -1003,6 +1003,13 @@ void GenerateFragmentShader(char *buffer) {
 		WRITE(p, "  %s = vec4(1,0,1,1);\n", fragColor0);
 	}
 #endif
+
+	if (true) {
+		WRITE(p, "  highp float z = gl_FragCoord.z;\n");
+		WRITE(p, "  z = (1.0/65535.0) * floor(z * 65535.0);\n");
+		WRITE(p, "  gl_FragDepth = z;\n");
+	}
+
 	WRITE(p, "}\n");
 }