#ifndef INC_YUYV
#define INC_YUYV

const int YUYV_FOURCC = 1448695129;

// https://en.wikipedia.org/wiki/Y%E2%80%B2UV
const mat3x3 yuyv_to_rgb_bt709 = mat3x3(1., 1., 1., 0., -.21482, 2.12798, 1.28033, -.38059, 0.);

vec4 yuyvTex(sampler2D tex, vec2 vUV, int base_width) {
    float w = base_width - 1.;
    int x = int(vUV.x * w);

    int xU = x - x % 2;
    int xV = x - x % 2 + 1;

    vec4 tU = texture(tex, vec2(xU / w, 1. - vUV.y));
    vec4 tV = texture(tex, vec2(xV / w, 1. - vUV.y));

    vec3 yuv = vec3(
            x % 2 == 0. ? tU.x : tV.x,
            tU.y - .5,
            tV.y - .5
        );

    return vec4(yuyv_to_rgb_bt709 * yuv, 1.);
}

#endif