Fixed shaders for OpenGL ES

AVQt/texture.fsh

 // fragment shader
 
+#ifdef GL_ES
+// Set default precision to medium
+precision mediump int;
+precision mediump float;
+#endif
+
 in vec4 fragColor;// input: interpolated color as rgba-value
 in vec2 texCoord;// input: texture coordinate (xy-coordinates)
 out vec4 finalColor;// output: final color value as rgba-value

AVQt/texture.vsh

 // vertex shader
 
-layout(location = 0) in vec3 position;   // input:  attribute with index '0' with 3 elements per vertex
+#ifdef GL_ES
+// Set default precision to medium
+precision mediump int;
+precision mediump float;
+#endif
+
+layout(location = 0) in vec3 position;// input:  attribute with index '0' with 3 elements per vertex
 //layout(location = 1) in vec3 color;      // input:  attribute with index '1' with 3 elements (=rgb) per vertex
-layout(location = 1) in vec2 texcoords;  // input:  attribute with index '2' with 2 elements per vertex
+layout(location = 1) in vec2 texcoords;// input:  attribute with index '2' with 2 elements per vertex
 //layout(location = 2) in float texnr;     // input:  attribute with index '3' with 1 float per vertex
 
-out vec4 fragColor;                      // output: computed fragmentation color
-out vec2 texCoord;                       // output: computed texture coordinates
+out vec4 fragColor;// output: computed fragmentation color
+out vec2 texCoord;// output: computed texture coordinates
 //flat out float texID;                    // output: texture ID - mind the 'flat' attribute!
 
 void main() {