spg-project/resources/post.fs

#version 430

layout (binding = 0) uniform sampler2D samp;

in vec2 varTex;

out vec4 color;

void main(void) {
    float a = texture(samp, varTex).r;
    float f = 1 - pow(a, 1000);
    color = vec4(f, f, f, 1.0);
}