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nir/lower_tex: optimize offset lowering for has_texture_scaling

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Generates much better code and even helps to beat a blob driver.

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24054>
This commit is contained in:
Christian Gmeiner 2023-07-08 17:37:35 +02:00 • committed by Marge Bot
parent 9383009809
commit f831883af6
1 changed files with 9 additions and 2 deletions
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11
src/compiler/nir/nir_lower_tex.c
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@ -176,8 +176,15 @@ lower_offset(nir_builder *b, nir_tex_instr *tex)
if (tex->sampler_dim == GLSL_SAMPLER_DIM_RECT) {
offset_coord = nir_fadd(b, coord, nir_i2f32(b, offset));
} else {
nir_ssa_def *txs = nir_i2f32(b, nir_get_texture_size(b, tex));
nir_ssa_def *scale = nir_frcp(b, txs);
nir_ssa_def *scale = NULL;
if (b->shader->options->has_texture_scaling) {
nir_ssa_def *idx = nir_imm_int(b, tex->texture_index);
scale = nir_load_texture_scale(b, 32, idx);
} else {
nir_ssa_def *txs = nir_i2f32(b, nir_get_texture_size(b, tex));
scale = nir_frcp(b, txs);
}
offset_coord = nir_fadd(b, coord,
nir_fmul(b,