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etnaviv: nir: Add nir_texop_tg4 offset lowering

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Implement offset lowering by converting pixel offsets to normalized
coordinate space and adjusting coordinates accordingly.

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36622>
This commit is contained in:
Christian Gmeiner 2025-07-03 11:50:02 +02:00 • committed by Marge Bot
parent 561faa2259
commit 870252379c
1 changed files with 54 additions and 0 deletions
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54
src/gallium/drivers/etnaviv/etnaviv_nir_lower_texture.c
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@ -251,6 +251,57 @@ lower_txd_offset(nir_builder *b, nir_tex_instr *tex, UNUSED void *data)
return true;
}
static bool
lower_tg4_offset(nir_builder *b, nir_tex_instr *tex, UNUSED void *data)
{
if (tex->op != nir_texop_tg4)
return false;
nir_def *offset = nir_steal_tex_src(tex, nir_tex_src_offset);
if (!offset)
return false;
int coord_index = nir_tex_instr_src_index(tex, nir_tex_src_coord);
assert(coord_index >= 0);
nir_def *coord = tex->src[coord_index].src.ssa;
b->cursor = nir_before_instr(&tex->instr);
/* Clamp offset to min_texel_offset and max_texel_offset */
offset = nir_iclamp(b, offset, nir_imm_int(b, -8), nir_imm_int(b, 7));
nir_def *sampler = nir_imm_int(b, tex->texture_index);
nir_def *base_size_int = nir_load_texture_size_etna(b, 32, sampler);
base_size_int = nir_trim_vector(b, base_size_int, tex->coord_components);
nir_def *base_size = nir_i2f32(b, base_size_int);
offset = nir_i2f32(b, offset);
if (tex->is_array) {
const unsigned array_index = tex->coord_components - 1;
/* Split coordinate into spatial part and array layer */
nir_def *spatial_coord = nir_trim_vector(b, coord, array_index);
nir_def *array_layer = nir_channel(b, coord, array_index);
/* Apply offset only to spatial coordinates */
spatial_coord = nir_fadd(b, spatial_coord,
nir_fdiv(b, nir_trim_vector(b, offset, array_index),
base_size));
/* Reconstruct full coordinate with original array layer */
coord = nir_vec3(b, nir_channel(b, spatial_coord, 0),
nir_channel(b, spatial_coord, 1),
array_layer);
} else {
coord = nir_fadd(b, coord, nir_fdiv(b, offset, base_size));
}
nir_src_rewrite(&tex->src[coord_index].src, coord);
return true;
}
static bool
legalize_txf_lod(nir_builder *b, nir_tex_instr *tex, UNUSED void *data)
{
@ -427,6 +478,9 @@ etna_nir_lower_texture(nir_shader *s, struct etna_shader_key *key, const struct
NIR_PASS(progress, s, nir_shader_tex_pass, lower_txd_offset,
nir_metadata_control_flow, NULL);
NIR_PASS(progress, s, nir_shader_tex_pass, lower_tg4_offset,
nir_metadata_control_flow, NULL);
NIR_PASS(progress, s, nir_shader_tex_pass, legalize_txf_lod,
nir_metadata_control_flow, NULL);