Shader "GLSL basic shader" { // defines the name of the shader
   SubShader { // Unity chooses the subshader that fits the GPU best
      Pass { // some shaders require multiple passes
         GLSLPROGRAM // here begins the part in Unity's GLSL
         #ifdef VERTEX // here begins the vertex shader
         void main() // all vertex shaders define a main() function
         {
            gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
         }
         #endif // here ends the definition of the vertex shader
         #ifdef FRAGMENT // here begins the fragment shader

         #include "UnityCG.glslinc"

        void main() // all fragment shaders define a main() function
         {
            gl_FragColor = vec4(0,sin(_Time.y)*1.0,0,1.0);
         }
         #endif // here ends the definition of the fragment shader
         ENDGLSL // here ends the part in GLSL
      }
   }
}