#version 330
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								// Input vertex attributes (from vertex shader)
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								in vec2 fragTexCoord;
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								in vec4 fragColor;
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								// Input uniform values
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								uniform sampler2D texture0;
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								uniform vec4 colDiffuse;
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								// Output fragment color
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								out vec4 finalColor;
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								// NOTE: Add here your custom variables
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								void main()
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								{
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								    // Texel color fetching from texture sampler
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								    vec4 texelColor = texture(texture0, fragTexCoord)*colDiffuse*fragColor;
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								    // Convert texel color to grayscale using NTSC conversion weights
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								    float gray = dot(texelColor.rgb, vec3(0.299, 0.587, 0.114));
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								    // Calculate final fragment color
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								    finalColor = vec4(gray, gray, gray, texelColor.a);
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								}
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