GLES shader fixes

plugins/SimulationView/layers.shader

@@ -28,6 +28,13 @@ vertex =
     }
 
 fragment =
+    #ifdef GL_ES
+        #ifdef GL_FRAGMENT_PRECISION_HIGH
+            precision highp float;
+        #else
+            precision mediump float;
+        #endif // GL_FRAGMENT_PRECISION_HIGH
+    #endif // GL_ES
     varying lowp vec4 v_color;
     varying float v_line_type;
 

plugins/SimulationView/layers_shadow.shader

@@ -28,6 +28,13 @@ vertex =
     }
 
 fragment =
+    #ifdef GL_ES
+        #ifdef GL_FRAGMENT_PRECISION_HIGH
+            precision highp float;
+        #else
+            precision mediump float;
+        #endif // GL_FRAGMENT_PRECISION_HIGH
+    #endif // GL_ES
     varying lowp vec4 v_color;
     varying float v_line_type;
 

plugins/SimulationView/simulationview_composite.shader

@@ -13,6 +13,13 @@ vertex =
     }
 
 fragment =
+    #ifdef GL_ES
+        #ifdef GL_FRAGMENT_PRECISION_HIGH
+            precision highp float;
+        #else
+            precision mediump float;
+        #endif // GL_FRAGMENT_PRECISION_HIGH
+    #endif // GL_ES
     uniform sampler2D u_layer0;
     uniform sampler2D u_layer1;
     uniform sampler2D u_layer2;

plugins/XRayView/xray_composite.shader

@@ -13,6 +13,13 @@ vertex =
     }
 
 fragment =
+    #ifdef GL_ES
+        #ifdef GL_FRAGMENT_PRECISION_HIGH
+            precision highp float;
+        #else
+            precision mediump float;
+        #endif // GL_FRAGMENT_PRECISION_HIGH
+    #endif // GL_ES
     uniform sampler2D u_layer0; //Default pass.
     uniform sampler2D u_layer1; //Selection pass.
     uniform sampler2D u_layer2; //X-ray pass.

resources/shaders/grid.shader

@@ -14,6 +14,14 @@ vertex =
     }
 
 fragment =
+    #ifdef GL_ES
+        #extension GL_OES_standard_derivatives : enable
+        #ifdef GL_FRAGMENT_PRECISION_HIGH
+            precision highp float;
+        #else
+            precision mediump float;
+        #endif // GL_FRAGMENT_PRECISION_HIGH
+    #endif // GL_ES
     uniform lowp vec4 u_plateColor;
     uniform lowp vec4 u_gridColor0;
     uniform lowp vec4 u_gridColor1;