On Wed, May 18, 2016 at 6:00 PM, Kenneth Graunke <kenn...@whitecape.org> wrote:
> The Y-offset needs flipping as well, similar to ddy.
>
> Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
Reviewed-by: Rob Clark <robdcl...@gmail.com>
> ---
> src/compiler/nir/nir_lower_wpos_ytransform.c | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/src/compiler/nir/nir_lower_wpos_ytransform.c
> b/src/compiler/nir/nir_lower_wpos_ytransform.c
> index 41f8554..4dc9d95 100644
> --- a/src/compiler/nir/nir_lower_wpos_ytransform.c
> +++ b/src/compiler/nir/nir_lower_wpos_ytransform.c
> @@ -257,6 +257,25 @@ lower_fddy(lower_wpos_ytransform_state *state,
> nir_alu_instr *fddy)
> fddy->src[0].swizzle[i] = MIN2(i, pt->num_components - 1);
> }
>
> +/* Multiply interp_var_at_offset's offset by transform.x to flip it. */
> +static void
> +lower_interp_var_at_offset(lower_wpos_ytransform_state *state,
> + nir_intrinsic_instr *interp)
> +{
> + nir_builder *b = &state->b;
> + nir_ssa_def *offset;
> + nir_ssa_def *flip_y;
> +
> + b->cursor = nir_before_instr(&interp->instr);
> +
> + offset = nir_ssa_for_src(b, interp->src[0], 2);
> + flip_y = nir_fmul(b, nir_channel(b, offset, 1),
> + nir_channel(b, get_transform(state), 0));
> + nir_instr_rewrite_src(&interp->instr, &interp->src[0],
> + nir_src_for_ssa(nir_vec2(b, nir_channel(b, offset,
> 0),
> + flip_y)));
> +}
> +
> static bool
> lower_wpos_ytransform_block(lower_wpos_ytransform_state *state, nir_block
> *block)
> {
> @@ -272,6 +291,8 @@ lower_wpos_ytransform_block(lower_wpos_ytransform_state
> *state, nir_block *block
> assert(dvar->deref.child == NULL);
> lower_fragcoord(state, intr);
> }
> + } else if (intr->intrinsic == nir_intrinsic_interp_var_at_offset) {
> + lower_interp_var_at_offset(state, intr);
> }
> } else if (instr->type == nir_instr_type_alu) {
> nir_alu_instr *alu = nir_instr_as_alu(instr);
> --
> 2.8.2
>
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