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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"
bool 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 bool
nir_lod_errata_instr(nir_builder *b, nir_instr *instr, void *data)
{
if (instr->type != nir_instr_type_tex)
return false;
nir_tex_instr *tex = nir_instr_as_tex(instr);
b->cursor = nir_before_instr(instr);
/* The errata only applies to textureLod ("TEXGRD") */
if (tex->op != nir_texop_txl)
return false;
/* TODO: Indirect samplers, separate sampler objects XXX */
nir_def *sampler = nir_imm_int(b, tex->texture_index);
/* Let's grab the sampler parameters */
nir_def *params = nir_load_sampler_lod_parameters_pan(b, 3, 32, sampler);
/* Extract the individual components */
nir_def *min_lod = nir_channel(b, params, 0);
nir_def *max_lod = nir_channel(b, params, 1);
nir_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_def *lod = tex->src[i].src.ssa;
nir_def *biased = nir_fadd(b, lod, lod_bias);
nir_def *clamped = nir_fmin(b, nir_fmax(b, biased, min_lod), max_lod);
nir_src_rewrite(&tex->src[i].src, clamped);
}
return true;
}
bool
midgard_nir_lod_errata(nir_shader *shader)
{
return nir_shader_instructions_pass(
shader, nir_lod_errata_instr,
nir_metadata_block_index | nir_metadata_dominance, NULL);
}
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