first commit

fshader.glsl

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+#version 420 core
+
+out vec4 FragColor;
+
+in vec2 TexPos;
+
+uniform sampler2D screenshot;
+uniform vec2 mousePos;
+
+void main(){
+	FragColor = texture(screenshot, TexPos);
+	if(distance(gl_FragCoord, vec4(mousePos, 0, 0)) <= 30){
+		FragColor = mix(FragColor, vec4(1., 1., 1., 1.), 0.5);
+	}
+}