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* Copyright © 2016 Red Hat
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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/* Lowers the additional tex_src_plane src, generated by nir_lower_tex
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* for planar YUV textures, into separate samplers, matching the logic
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* that mesa/st uses to insert additional sampler view/state (since both
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* sides need to agree).
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* This should run after nir_lower_samplers.
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#include "util/u_string.h"
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#include "compiler/nir/nir.h"
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#include "compiler/nir/nir_builder.h"
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struct nir_shader *shader;
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unsigned lower_2plane;
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unsigned lower_3plane;
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/* Maps a primary sampler (used for Y) to the U or UV sampler. In
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* case of 3-plane YUV format, the V plane is next sampler after U.
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unsigned char sampler_map[PIPE_MAX_SAMPLERS][2];
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} lower_tex_src_state;
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find_sampler(lower_tex_src_state *state, unsigned samp)
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/* NOTE: arrays of samplerExternalOES do not appear to be allowed: */
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nir_foreach_uniform_variable(var, state->shader)
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if (var->data.binding == samp)
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add_sampler(lower_tex_src_state *state, unsigned orig_binding,
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unsigned new_binding, const char *ext)
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const struct glsl_type *samplerExternalOES =
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glsl_sampler_type(GLSL_SAMPLER_DIM_EXTERNAL, false, false, GLSL_TYPE_FLOAT);
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nir_variable *new_sampler, *orig_sampler =
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find_sampler(state, orig_binding);
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UNUSED int r = asprintf(&name, "%s:%s", orig_sampler->name, ext);
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new_sampler = nir_variable_create(state->shader, nir_var_uniform,
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samplerExternalOES, name);
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new_sampler->data.binding = new_binding;
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assign_extra_samplers(lower_tex_src_state *state, unsigned free_slots)
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unsigned mask = state->lower_2plane | state->lower_3plane;
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unsigned extra, y_samp = u_bit_scan(&mask);
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if (state->lower_3plane & (1 << y_samp)) {
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/* two additional planes (U and V): */
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extra = u_bit_scan(&free_slots);
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state->sampler_map[y_samp][0] = extra;
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add_sampler(state, y_samp, extra, "u");
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extra = u_bit_scan(&free_slots);
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state->sampler_map[y_samp][1] = extra;
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add_sampler(state, y_samp, extra, "v");
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/* single additional UV plane: */
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extra = u_bit_scan(&free_slots);
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state->sampler_map[y_samp][0] = extra;
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add_sampler(state, y_samp, extra, "uv");
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lower_tex_src_plane_block(nir_builder *b, lower_tex_src_state *state, nir_block *block)
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nir_foreach_instr(instr, block) {
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if (instr->type != nir_instr_type_tex)
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nir_tex_instr *tex = nir_instr_as_tex(instr);
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int plane_index = nir_tex_instr_src_index(tex, nir_tex_src_plane);
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nir_const_value *plane = nir_src_as_const_value(tex->src[plane_index].src);
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if (plane[0].i32 > 0) {
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unsigned y_samp = tex->texture_index;
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int tex_index = nir_tex_instr_src_index(tex, nir_tex_src_texture_deref);
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if (tex_index >= 0) {
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nir_deref_instr *deref = nir_src_as_deref(tex->src[tex_index].src);
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y_samp = nir_deref_instr_get_variable(deref)->data.binding;
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assume(((state->lower_3plane & (1 << y_samp)) && plane[0].i32 < 3) ||
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unsigned u_v_samp = state->sampler_map[y_samp][plane[0].i32 - 1];
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BITSET_SET(state->shader->info.textures_used, u_v_samp);
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/* For drivers using PIPE_CAP_NIR_SAMPLERS_AS_DEREF, we need
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* to reference the correct sampler nir variable.
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int samp_index = nir_tex_instr_src_index(tex, nir_tex_src_sampler_deref);
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if (tex_index >= 0 && samp_index >= 0) {
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b->cursor = nir_before_instr(&tex->instr);
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nir_variable* samp = find_sampler(state, u_v_samp);
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nir_deref_instr *tex_deref_instr = nir_build_deref_var(b, samp);
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nir_ssa_def *tex_deref = &tex_deref_instr->dest.ssa;
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nir_instr_rewrite_src(&tex->instr,
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&tex->src[tex_index].src,
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nir_src_for_ssa(tex_deref));
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nir_instr_rewrite_src(&tex->instr,
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&tex->src[samp_index].src,
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nir_src_for_ssa(tex_deref));
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/* For others we need to update texture_index */
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assume(tex->texture_index == tex->sampler_index);
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tex->texture_index = tex->sampler_index = u_v_samp;
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nir_tex_instr_remove_src(tex, plane_index);
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lower_tex_src_plane_impl(lower_tex_src_state *state, nir_function_impl *impl)
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nir_builder_init(&b, impl);
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nir_foreach_block(block, impl) {
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lower_tex_src_plane_block(&b, state, block);
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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st_nir_lower_tex_src_plane(struct nir_shader *shader, unsigned free_slots,
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unsigned lower_2plane, unsigned lower_3plane)
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lower_tex_src_state state = {0};
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state.shader = shader;
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state.lower_2plane = lower_2plane;
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state.lower_3plane = lower_3plane;
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assign_extra_samplers(&state, free_slots);
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nir_foreach_function(function, shader) {
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lower_tex_src_plane_impl(&state, function->impl);