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ac/nir: compute ddx/ddy for barycentric_at_offset at the beginning of shaders

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to make it work after terminate (discard).

Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33024>
This commit is contained in:
Marek Olšák 2025-01-15 20:24:36 -05:00
parent f98613d47c
commit 0a228dfef2
1 changed files with 10 additions and 7 deletions
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17
src/amd/common/nir/ac_nir_lower_ps_early.c
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@ -291,15 +291,18 @@ lower_ps_load_sample_mask_in(nir_builder *b, nir_intrinsic_instr *intrin, lower_
static nir_def *
lower_load_barycentric_at_offset(nir_builder *b, nir_def *offset, enum glsl_interp_mode mode)
{
nir_def *baryc = nir_load_barycentric_pixel(b, 32, .interp_mode = mode);
nir_def *i = nir_channel(b, baryc, 0);
nir_def *j = nir_channel(b, baryc, 1);
/* ddx/ddy must execute before terminate (discard). */
nir_builder sb = nir_builder_at(nir_before_impl(b->impl));
nir_def *baryc = nir_load_barycentric_pixel(&sb, 32, .interp_mode = mode);
nir_def *i = nir_channel(&sb, baryc, 0);
nir_def *j = nir_channel(&sb, baryc, 1);
nir_def *ddx_i = nir_ddx(&sb, i);
nir_def *ddx_j = nir_ddx(&sb, j);
nir_def *ddy_i = nir_ddy(&sb, i);
nir_def *ddy_j = nir_ddy(&sb, j);
nir_def *offset_x = nir_channel(b, offset, 0);
nir_def *offset_y = nir_channel(b, offset, 1);
nir_def *ddx_i = nir_ddx(b, i);
nir_def *ddx_j = nir_ddx(b, j);
nir_def *ddy_i = nir_ddy(b, i);
nir_def *ddy_j = nir_ddy(b, j);
/* Interpolate standard barycentrics by offset. */
nir_def *offset_i = nir_ffma(b, ddy_i, offset_y, nir_ffma(b, ddx_i, offset_x, i));