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/*
* Copyright © 2016 Red Hat
*
* 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.
*/
/* Lowers the additional tex_src_plane src, generated by nir_lower_tex
* for planar YUV textures, into separate samplers, matching the logic
* that mesa/st uses to insert additional sampler view/state (since both
* sides need to agree).
*
* This should run after nir_lower_samplers.
*/
#include "compiler/nir/nir.h"
#include "st_nir.h"
typedef struct {
unsigned lower_2plane;
unsigned lower_3plane;
/* Maps a primary sampler (used for Y) to the U or UV sampler. In
* case of 3-plane YUV format, the V plane is next sampler after U.
*/
unsigned char sampler_map[PIPE_MAX_SAMPLERS][2];
} lower_tex_src_state;
static void
assign_extra_samplers(lower_tex_src_state *state, unsigned free_slots)
{
unsigned mask = state->lower_2plane | state->lower_3plane;
while (mask) {
unsigned extra, y_samp = u_bit_scan(&mask);
extra = u_bit_scan(&free_slots);
state->sampler_map[y_samp][0] = extra;
if (state->lower_3plane & (1 << y_samp)) {
extra = u_bit_scan(&free_slots);
state->sampler_map[y_samp][1] = extra;
}
}
}
static void
lower_tex_src_plane_block(lower_tex_src_state *state, nir_block *block)
{
nir_foreach_instr(instr, block) {
if (instr->type != nir_instr_type_tex)
continue;
nir_tex_instr *tex = nir_instr_as_tex(instr);
int plane_index = nir_tex_instr_src_index(tex, nir_tex_src_plane);
if (plane_index < 0)
continue;
nir_const_value *plane = nir_src_as_const_value(tex->src[plane_index].src);
assume(plane);
if (plane->i32[0] > 0) {
unsigned y_samp = tex->texture_index;
assume(tex->texture_index == tex->sampler_index);
assume(((state->lower_3plane & (1 << y_samp)) && plane->i32[0] < 3) ||
(plane->i32[0] < 2));
tex->texture_index = tex->sampler_index =
state->sampler_map[y_samp][plane->i32[0] - 1];
}
nir_tex_instr_remove_src(tex, plane_index);
}
}
static void
lower_tex_src_plane_impl(lower_tex_src_state *state, nir_function_impl *impl)
{
nir_foreach_block(block, impl) {
lower_tex_src_plane_block(state, block);
}
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
}
void
st_nir_lower_tex_src_plane(struct nir_shader *shader, unsigned free_slots,
unsigned lower_2plane, unsigned lower_3plane)
{
lower_tex_src_state state = {0};
state.lower_2plane = lower_2plane;
state.lower_3plane = lower_3plane;
assign_extra_samplers(&state, free_slots);
nir_foreach_function(function, shader) {
if (function->impl)
lower_tex_src_plane_impl(&state, function->impl);
}
}
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