retrofire-core 0.4.0-pre4

Core functionality of the retrofire project.
Documentation 
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#![allow(unused)]

use retrofire_core::prelude::*;

use retrofire_core::{
    render::tex::SamplerClamp,
    util::{self, pixfmt::Xrgb8888, pnm::parse_pnm},
};

const VERTS: [Vertex3<TexCoord>; 4] = [
    vertex(pt3(-1.0, -1.0, 0.0), uv(0.0, 0.0)),
    vertex(pt3(1.0, -1.0, 0.0), uv(0.0, 1.0)),
    vertex(pt3(-1.0, 1.0, 0.0), uv(1.0, 0.0)),
    vertex(pt3(1.0, 1.0, 0.0), uv(1.0, 1.0)),
];
const FACES: [Tri<usize>; 2] = [tri(0, 1, 2), tri(3, 2, 1)];

#[test]
fn textured_quad() {
    let checker = Texture::from(Buf2::new_with((8, 8), |x, y| {
        let xor = (x ^ y) & 1;
        // Blue if x == y, dark red otherwise.
        rgba(0x7F * xor as u8, 0, 0xFF * (1 - xor) as u8, 0)
    }));

    let shader = shader::new(
        |v: Vertex3<_>, mvp: &Mat4x4<ModelToProj>| {
            vertex(mvp.apply(&v.pos), v.attrib)
        },
        |frag: Frag<_>| SamplerClamp.sample(&checker, frag.var),
    );

    let (w, h) = (256, 256);
    let project = perspective(1.0, 1.0, 0.1..1000.0);
    let viewport = viewport(pt2(0, 0)..pt2(w, h));
    let mvp = translate3(0.0, 0.0, 1.0).to().then(&project);

    let mut framebuf = Buf2::<Color3>::new((w, h));
    let mut ctx = Context::default();

    render(FACES, VERTS, &shader, &mvp, viewport, &mut framebuf, &ctx);

    assert_eq!(framebuf[0][0], rgb(0, 0, 0xFF));
    assert_eq!(framebuf[255][0], rgb(0x7F, 0, 0));
    assert_eq!(framebuf[0][255], rgb(0x7F, 0, 0));

    let comp = *include_bytes!("textured_quad.ppm");
    let comp = parse_pnm(comp).expect("should be a valid ppm");

    assert_eq!(framebuf, comp);

    #[cfg(feature = "std")]
    {
        use util::pnm::*;
        // Uncomment to save generated image to compare visually
        //save_ppm("tests/textured_quad_actual.ppm", &framebuf);
        // Uncomment to (re)generate the comparison image
        //save_ppm("tests/textured_quad.ppm", &buf).expect("should save image");
    }
}