cornerCustom.shader

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Shader "Custom/cornerCustom" {  
    Properties
    {        
            _MainTex ("Texture Image", 2D) = "white" {}
            _TexSizeX ("Texture Width", Float) = 0.0
            _TexSizeY ("Texture Height", Float) = 0.0
    }
    SubShader
    {
        Pass
            {
                GLSLPROGRAM 

                uniform sampler2D _MainTex;
                varying vec4 textureCoordinates; 
                uniform float _TexSizeX;
                uniform float _TexSizeY;
                                       
                #ifdef VERTEX   
                
                void main()
                {          
                   textureCoordinates = gl_MultiTexCoord0;
                    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
                }
                #endif  
           
                #ifdef FRAGMENT
                
                void main()
                {
                   vec4 x0 = texture2D(_MainTex, vec2(textureCoordinates) + vec2(-1.0/_TexSizeX, 0.0));
                   vec4 x1 = texture2D(_MainTex, vec2(textureCoordinates) + vec2( 1.0/_TexSizeX, 0.0));
                
                   vec4 gx = (x1 - x0) / 2.0;
                   float gradX = (gx.r + gx.g + gx.b) / 3.0;
                
                   vec4 y0 = texture2D(_MainTex, vec2(textureCoordinates) + vec2(0.0, -1.0/_TexSizeY));
                   vec4 y1 = texture2D(_MainTex, vec2(textureCoordinates) + vec2(0.0,  1.0/_TexSizeY));
                   
                   vec4 gy = (y1 - y0) / 2.0;
                   float gradY = (gy.r + gy.g + gy.b) / 3.0;
                   
                   float magnitude = (length(vec2(gradX,gradY)) / sqrt(2.0));
                   
                   gl_FragColor = vec4(magnitude,magnitude,magnitude, 1.0);
                }
                #endif                          
                ENDGLSL        
            }
     }
}