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use crate::math::*;
use crate::core::*;
use crate::effect::*;

///
/// A simple anti-aliasing approach which smooths otherwise jagged edges (for example lines) but also
/// smooths the rest of the image.
///
pub struct FXAAEffect {
    pub color: Vec3,
    pub density: f32,
    pub animation: f32,
    image_effect: ImageEffect
}

impl FXAAEffect {

    pub fn new(gl: &Context) -> Result<Self, Error>
    {
        Ok(Self {color: vec3(0.8, 0.8, 0.8), density: 0.2, animation: 0.1, image_effect: ImageEffect::new(gl, include_str!("shaders/fxaa.frag"))?})
    }

    pub fn apply(&self, viewport: Viewport, color_texture: &dyn Texture) -> Result<(), Error>
    {
        let render_states = RenderStates {cull: CullType::Back, write_mask: WriteMask::COLOR, depth_test: DepthTestType::Always, ..Default::default()};

        self.image_effect.program().use_texture(color_texture, "colorMap")?;
        self.image_effect.program().use_uniform_vec2("resolution", &vec2(color_texture.width() as f32, color_texture.height() as f32))?;

        self.image_effect.apply(render_states, viewport)?;
        Ok(())
    }

}