static nir_ssa_def*
build_length(nir_builder *b, nir_ssa_def *vec)
{
switch (vec->num_components) {
case 1: return nir_fsqrt(b, nir_fmul(b, vec, vec));
case 2: return nir_fsqrt(b, nir_fdot2(b, vec, vec));
case 3: return nir_fsqrt(b, nir_fdot3(b, vec, vec));
case 4: return nir_fsqrt(b, nir_fdot4(b, vec, vec));
default:
unreachable("Invalid number of components");
}
}
{
nir_const_value m[3] = {
{ .f32 = { 1.0f, 0.0f, 1.59602678f, 0.0f } },
{ .f32 = { 1.0f, -0.39176229f, -0.81296764f, 0.0f } },
{ .f32 = { 1.0f, 2.01723214f, 0.0f, 0.0f } }
};
nir_ssa_def *yuv =
nir_vec4(b,
nir_fmul(b, nir_imm_float(b, 1.16438356f),
nir_fadd(b, y, nir_imm_float(b, -0.0625f))),
nir_channel(b, nir_fadd(b, u, nir_imm_float(b, -0.5f)), 0),
nir_channel(b, nir_fadd(b, v, nir_imm_float(b, -0.5f)), 0),
nir_imm_float(b, 0.0));
nir_ssa_def *red = nir_fdot4(b, yuv, nir_build_imm(b, 4, 32, m[0]));
nir_ssa_def *green = nir_fdot4(b, yuv, nir_build_imm(b, 4, 32, m[1]));
nir_ssa_def *blue = nir_fdot4(b, yuv, nir_build_imm(b, 4, 32, m[2]));
nir_ssa_def *result = nir_vec4(b, red, green, blue, nir_imm_float(b, 1.0f));
nir_ssa_def_rewrite_uses(&tex->dest.ssa, nir_src_for_ssa(result));
}
static void
lower_y_uv_external(nir_builder *b, nir_tex_instr *tex)
{
b->cursor = nir_after_instr(&tex->instr);
nir_ssa_def *y = sample_plane(b, tex, 0);
nir_ssa_def *uv = sample_plane(b, tex, 1);