#version 150

uniform sampler2D tex0;
uniform float greyscale;

in vec2 tex_c;

out vec4 outputColor;


void main()
{
    vec4 texColor = texture(tex0, tex_c);    

    // Discard fragments with alpha below a threshold
    if (texColor.a < 0.1) {
        discard;
    }
    
    // Convert to grayscale if is_nearest is true
    if (greyscale < 0.5) {  // Using 0.5 as threshold since GLSL doesn't have bool
        float gray = dot(texColor.rgb, vec3(0.299, 0.587, 0.114));  // Standard grayscale conversion
        outputColor = vec4(vec3(gray), texColor.a);
    } else {
        outputColor = texColor;
    }
}