#define DECL(t, n) t n : n
#define DESV(t, n, s) t n : s

struct xform {
    float2 bx;
    float2 by;
    float2 og;
};

/* Linear color from normalized sRGB */
float4 linear_from_srgb(float4 srgb)
{
    return float4(pow(srgb.rgb, 2.2), srgb.a);
}

/* Linear color from R8G8B8A8 sRGB  */
float4 linear_from_srgb32(uint srgb32)
{
    float4 res;
    res.r = ((srgb32 >> 0) & 0xFF) / 255.0;
    res.g = ((srgb32 >> 8) & 0xFF) / 255.0;
    res.b = ((srgb32 >> 16) & 0xFF) / 255.0;
    res.a = ((srgb32 >> 24) & 0xFF) / 255.0;
    return linear_from_srgb(res);
}

float2 xform_mul(struct xform xf, float2 v)
{
    return xf.bx * v.x + xf.by * v.y + xf.og;
}