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/*
* Copyright © 2019 Google, Inc.
*
* 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.
*/
/*
* This lower pass lowers load_interpolated_input for various interpolation
* modes (as configured via nir_lower_interpolation_options bitmask) into
* load_attribute_deltas plus alu instructions:
*
* vec3 ad = load_attribute_deltas(varying_slot)
* float result = ad.x + ad.y * j + ad.z * i
*
*/
#include "nir.h"
#include "nir_builder.h"
static bool
nir_lower_interpolation_instr(nir_builder *b, nir_instr *instr, void *cb_data)
{
nir_lower_interpolation_options options =
*(nir_lower_interpolation_options *)cb_data;
if (instr->type != nir_instr_type_intrinsic)
return false;
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
if (intr->intrinsic != nir_intrinsic_load_interpolated_input)
return false;
assert(intr->dest.is_ssa);
assert(intr->src[0].is_ssa);
assert(intr->src[1].is_ssa);
nir_intrinsic_instr *bary_intrinsic =
nir_instr_as_intrinsic(intr->src[0].ssa->parent_instr);
/* Leave VARYING_SLOT_POS alone */
if (nir_intrinsic_base(intr) == VARYING_SLOT_POS)
return false;
const enum glsl_interp_mode interp_mode =
nir_intrinsic_interp_mode(bary_intrinsic);
/* We need actual interpolation modes by the time we get here */
assert(interp_mode != INTERP_MODE_NONE);
/* Only lower for inputs that need interpolation */
if (interp_mode != INTERP_MODE_SMOOTH &&
interp_mode != INTERP_MODE_NOPERSPECTIVE)
return false;
nir_intrinsic_op op = bary_intrinsic->intrinsic;
switch (op) {
case nir_intrinsic_load_barycentric_at_sample:
if (options & nir_lower_interpolation_at_sample)
break;
return false;
case nir_intrinsic_load_barycentric_at_offset:
if (options & nir_lower_interpolation_at_offset)
break;
return false;
case nir_intrinsic_load_barycentric_centroid:
if (options & nir_lower_interpolation_centroid)
break;
return false;
case nir_intrinsic_load_barycentric_pixel:
if (options & nir_lower_interpolation_pixel)
break;
return false;
case nir_intrinsic_load_barycentric_sample:
if (options & nir_lower_interpolation_sample)
break;
return false;
default:
return false;
}
b->cursor = nir_before_instr(instr);
nir_ssa_def *comps[NIR_MAX_VEC_COMPONENTS];
for (int i = 0; i < intr->num_components; i++) {
nir_ssa_def *iid =
nir_load_fs_input_interp_deltas(b, 32, intr->src[1].ssa,
.base = nir_intrinsic_base(intr),
.component = (nir_intrinsic_component(intr) + i),
.io_semantics = nir_intrinsic_io_semantics(intr));
nir_ssa_def *bary = intr->src[0].ssa;
nir_ssa_def *val;
val = nir_ffma(b, nir_channel(b, bary, 1),
nir_channel(b, iid, 1),
nir_channel(b, iid, 0));
val = nir_ffma(b, nir_channel(b, bary, 0),
nir_channel(b, iid, 2),
val);
comps[i] = val;
}
nir_ssa_def *vec = nir_vec(b, comps, intr->num_components);
nir_ssa_def_rewrite_uses(&intr->dest.ssa, vec);
return true;
}
bool
nir_lower_interpolation(nir_shader *shader, nir_lower_interpolation_options options)
{
return nir_shader_instructions_pass(shader, nir_lower_interpolation_instr,
nir_metadata_block_index |
nir_metadata_dominance,
&options);
}
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