Fix GLES shader support after #9247 (#10727)

client/shaders/nodes_shader/opengl_fragment.glsl

@@ -16,7 +16,11 @@ varying vec3 vPosition;
 // precision must be considered).
 varying vec3 worldPosition;
 varying lowp vec4 varColor;
-centroid varying mediump vec2 varTexCoord;
+#ifdef GL_ES
+varying mediump vec2 varTexCoord;
+#else
+centroid varying vec2 varTexCoord;
+#endif
 varying vec3 eyeVec;
 
 const float fogStart = FOG_START;

client/shaders/nodes_shader/opengl_vertex.glsl

@@ -19,7 +19,11 @@ varying lowp vec4 varColor;
 // The centroid keyword ensures that after interpolation the texture coordinates
 // lie within the same bounds when MSAA is en- and disabled.
 // This fixes the stripes problem with nearest-neighbour textures and MSAA.
-centroid varying mediump vec2 varTexCoord;
+#ifdef GL_ES
+varying mediump vec2 varTexCoord;
+#else
+centroid varying vec2 varTexCoord;
+#endif
 varying vec3 eyeVec;
 
 // Color of the light emitted by the light sources.

client/shaders/object_shader/opengl_fragment.glsl

@@ -9,7 +9,11 @@ varying vec3 vNormal;
 varying vec3 vPosition;
 varying vec3 worldPosition;
 varying lowp vec4 varColor;
-centroid varying mediump vec2 varTexCoord;
+#ifdef GL_ES
+varying mediump vec2 varTexCoord;
+#else
+centroid varying vec2 varTexCoord;
+#endif
 
 varying vec3 eyeVec;
 varying float vIDiff;

client/shaders/object_shader/opengl_vertex.glsl

@@ -7,7 +7,11 @@ varying vec3 vNormal;
 varying vec3 vPosition;
 varying vec3 worldPosition;
 varying lowp vec4 varColor;
-centroid varying mediump vec2 varTexCoord;
+#ifdef GL_ES
+varying mediump vec2 varTexCoord;
+#else
+centroid varying vec2 varTexCoord;
+#endif
 
 varying vec3 eyeVec;
 varying float vIDiff;