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a1faab0b90
..Rather than at backend IR translation time. This is considerably simpler because we can use the txs lowering instead of special casing array sizes. Unfortunately it generates worse code, but that gap should close once nir_opt_preamble is wired in. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18652>
79 lines
3.1 KiB
C
79 lines
3.1 KiB
C
/*
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* Copyright (C) 2021 Alyssa Rosenzweig <alyssa@rosenzweig.io>
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* Copyright (C) 2020 Collabora Ltd.
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* Copyright © 2016 Broadcom
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "agx_compiler.h"
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#include "compiler/nir/nir.h"
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#include "compiler/nir/nir_builder.h"
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#include "compiler/nir/nir_builtin_builder.h"
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/*
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* NIR indexes into array textures with unclamped floats (integer for txf). AGX
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* requires the index to be a clamped integer. Lower tex_src_coord into
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* tex_src_backend1 for array textures by type-converting and clamping.
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*/
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static bool
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lower_array_texture(nir_builder *b, nir_instr *instr, UNUSED void *data)
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{
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if (instr->type != nir_instr_type_tex)
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return false;
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nir_tex_instr *tex = nir_instr_as_tex(instr);
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b->cursor = nir_before_instr(instr);
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if (!tex->is_array || nir_tex_instr_is_query(tex))
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return false;
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/* Get the coordinates */
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int coord_idx = nir_tex_instr_src_index(tex, nir_tex_src_coord);
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nir_ssa_def *coord = tex->src[coord_idx].src.ssa;
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unsigned nr = nir_src_num_components(tex->src[coord_idx].src);
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/* The layer is always the last component of the NIR coordinate */
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unsigned lidx = nr - 1;
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nir_ssa_def *layer = nir_channel(b, coord, lidx);
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/* Round layer to nearest even */
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if (tex->op != nir_texop_txf)
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layer = nir_f2u32(b, nir_fround_even(b, layer));
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/* Clamp to max layer = (# of layers - 1) for out-of-bounds handling */
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nir_ssa_def *txs = nir_get_texture_size(b, tex);
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nir_ssa_def *nr_layers = nir_channel(b, txs, lidx);
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layer = nir_umin(b, layer, nir_iadd_imm(b, nr_layers, -1));
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nir_tex_instr_remove_src(tex, coord_idx);
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nir_tex_instr_add_src(tex, nir_tex_src_backend1,
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nir_src_for_ssa(nir_vector_insert_imm(b, coord, layer,
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lidx)));
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return true;
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}
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bool
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agx_nir_lower_array_texture(nir_shader *s)
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{
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return nir_shader_instructions_pass(s, lower_array_texture,
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nir_metadata_block_index |
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nir_metadata_dominance, NULL);
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}
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