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/*
* Copyright © 2016 Intel Corporation
*
* 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 "nir.h"
#include "nir_builder.h"
#include "val_lower_vulkan_resource.h"
static nir_ssa_def *
load_frag_coord(nir_builder *b)
{
nir_foreach_variable(var, &b->shader->inputs) {
if (var->data.location == VARYING_SLOT_POS)
return nir_load_var(b, var);
}
nir_variable *pos = nir_variable_create(b->shader, nir_var_shader_in,
glsl_vec4_type(), NULL);
pos->data.location = VARYING_SLOT_POS;
/**
* From Vulkan spec:
* "The OriginLowerLeft execution mode must not be used; fragment entry
* points must declare OriginUpperLeft."
*
* So at this point origin_upper_left should be true
*/
assert(b->shader->info.fs.origin_upper_left == true);
return nir_load_var(b, pos);
}
static bool
try_lower_input_load(nir_function_impl *impl, nir_intrinsic_instr *load,
bool use_fragcoord_sysval)
{
nir_deref_instr *deref = nir_src_as_deref(load->src[0]);
assert(glsl_type_is_image(deref->type));
enum glsl_sampler_dim image_dim = glsl_get_sampler_dim(deref->type);
if (image_dim != GLSL_SAMPLER_DIM_SUBPASS &&
image_dim != GLSL_SAMPLER_DIM_SUBPASS_MS)
return false;
nir_builder b;
nir_builder_init(&b, impl);
b.cursor = nir_before_instr(&load->instr);
nir_ssa_def *frag_coord = use_fragcoord_sysval ? nir_load_frag_coord(&b)
: load_frag_coord(&b);
frag_coord = nir_f2i32(&b, frag_coord);
nir_ssa_def *offset = nir_ssa_for_src(&b, load->src[1], 2);
nir_ssa_def *pos = nir_iadd(&b, frag_coord, offset);
nir_ssa_def *layer = nir_imm_int(&b, 0);
nir_ssa_def *coord =
nir_vec4(&b, nir_channel(&b, pos, 0), nir_channel(&b, pos, 1), layer, layer);
nir_instr_rewrite_src(&load->instr, &load->src[1], nir_src_for_ssa(coord));
return true;
}
bool
val_lower_input_attachments(nir_shader *shader, bool use_fragcoord_sysval)
{
assert(shader->info.stage == MESA_SHADER_FRAGMENT);
bool progress = false;
nir_foreach_function(function, shader) {
if (!function->impl)
continue;
nir_foreach_block(block, function->impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *load = nir_instr_as_intrinsic(instr);
if (load->intrinsic != nir_intrinsic_image_deref_load)
continue;
progress |= try_lower_input_load(function->impl, load,
use_fragcoord_sysval);
}
}
}
return progress;
}
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