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/*
* Copyright (C) 2019 Collabora, Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "compiler/nir/nir.h"
#include "compiler/nir/nir_builder.h"
void midgard_nir_lod_errata(nir_shader *shader);
/* Workarounds errata pertaining to early Midgard chips where the settings for
* min_lod/max_lod/lod_bias are ignored in the sampler descriptor when
* texturing with a textureLod instruction. The workaround is to load these
* constants in as system values and perform the bias/clamp in the shader.
*/
static void
mir_lod_errata_body(nir_builder *b, nir_tex_instr *tex)
{
/* The errata only applies to textureLod ("TEXGRD") */
if (tex->op != nir_texop_txl)
return;
/* Let's grab the sampler parameters */
nir_intrinsic_instr *l = nir_intrinsic_instr_create(b->shader,
nir_intrinsic_load_sampler_lod_parameters_pan);
l->num_components = 3;
nir_ssa_dest_init(&l->instr, &l->dest, 3, 32, NULL);
/* TODO: Indirect samplers, separate sampler objects XXX */
nir_src idx = nir_src_for_ssa(nir_imm_int(b, tex->texture_index));
nir_src_copy(&l->src[0], &idx, l);
nir_builder_instr_insert(b, &l->instr);
nir_ssa_def *params = &l->dest.ssa;
/* Extract the individual components */
nir_ssa_def *min_lod = nir_channel(b, params, 0);
nir_ssa_def *max_lod = nir_channel(b, params, 1);
nir_ssa_def *lod_bias = nir_channel(b, params, 2);
/* Rewrite the LOD with bias/clamps. Order sensitive. */
for (unsigned i = 0; i < tex->num_srcs; i++) {
if (tex->src[i].src_type != nir_tex_src_lod)
continue;
nir_ssa_def *lod = nir_ssa_for_src(b, tex->src[i].src, 1);
nir_ssa_def *biased = nir_fadd(b, lod, lod_bias);
nir_ssa_def *clamped = nir_fmin(b,
nir_fmax(b, biased, min_lod), max_lod);
nir_instr_rewrite_src(&tex->instr, &tex->src[i].src,
nir_src_for_ssa(clamped));
}
}
void
midgard_nir_lod_errata(nir_shader *shader)
{
nir_foreach_function(function, shader) {
if (!function->impl) continue;
nir_builder b;
nir_builder_init(&b, function->impl);
nir_foreach_block(block, function->impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_tex) continue;
nir_tex_instr *tex = nir_instr_as_tex(instr);
b.cursor = nir_before_instr(instr);
mir_lod_errata_body(&b, tex);
}
}
nir_metadata_preserve(function->impl, nir_metadata_block_index | nir_metadata_dominance);
}
}
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