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#version 120
// Input vertex attributes (from vertex shader)
varying vec2 fragTexCoord;
varying vec4 fragColor;
// Input uniform values
uniform sampler2D texture0;
uniform vec4 colDiffuse;
// NOTE: Add here your custom variables
vec2 resolution = vec2(800.0, 450.0);
void main()
{
float x = 1.0/resolution.x;
float y = 1.0/resolution.y;
vec4 horizEdge = vec4(0.0);
horizEdge -= texture2D(texture0, vec2(fragTexCoord.x - x, fragTexCoord.y - y))*1.0;
horizEdge -= texture2D(texture0, vec2(fragTexCoord.x - x, fragTexCoord.y ))*2.0;
horizEdge -= texture2D(texture0, vec2(fragTexCoord.x - x, fragTexCoord.y + y))*1.0;
horizEdge += texture2D(texture0, vec2(fragTexCoord.x + x, fragTexCoord.y - y))*1.0;
horizEdge += texture2D(texture0, vec2(fragTexCoord.x + x, fragTexCoord.y ))*2.0;
horizEdge += texture2D(texture0, vec2(fragTexCoord.x + x, fragTexCoord.y + y))*1.0;
vec4 vertEdge = vec4(0.0);
vertEdge -= texture2D(texture0, vec2(fragTexCoord.x - x, fragTexCoord.y - y))*1.0;
vertEdge -= texture2D(texture0, vec2(fragTexCoord.x , fragTexCoord.y - y))*2.0;
vertEdge -= texture2D(texture0, vec2(fragTexCoord.x + x, fragTexCoord.y - y))*1.0;
vertEdge += texture2D(texture0, vec2(fragTexCoord.x - x, fragTexCoord.y + y))*1.0;
vertEdge += texture2D(texture0, vec2(fragTexCoord.x , fragTexCoord.y + y))*2.0;
vertEdge += texture2D(texture0, vec2(fragTexCoord.x + x, fragTexCoord.y + y))*1.0;
vec3 edge = sqrt((horizEdge.rgb*horizEdge.rgb) + (vertEdge.rgb*vertEdge.rgb));
gl_FragColor = vec4(edge, texture2D(texture0, fragTexCoord).a);
}
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