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5564 serge 1 
/*
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 * Copyright © 2015 Broadcom
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 *
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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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 *
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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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 * Software.
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 *
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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
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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 * IN THE SOFTWARE.
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 */
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/*
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 * This lowering pass converts the coordinate division for texture projection
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 * to be done in ALU instructions instead of asking the texture operation to
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 * do so.
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 */
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#include "nir.h"
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#include "nir_builder.h"
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static nir_ssa_def *
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channel(nir_builder *b, nir_ssa_def *def, int c)
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{
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   return nir_swizzle(b, def, (unsigned[4]){c, c, c, c}, 1, false);
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}
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static bool
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nir_lower_tex_projector_block(nir_block *block, void *void_state)
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{
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   nir_builder *b = void_state;
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   nir_foreach_instr_safe(block, instr) {
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      if (instr->type != nir_instr_type_tex)
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         continue;
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      nir_tex_instr *tex = nir_instr_as_tex(instr);
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      nir_builder_insert_before_instr(b, &tex->instr);
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      /* Find the projector in the srcs list, if present. */
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      int proj_index;
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      for (proj_index = 0; proj_index < tex->num_srcs; proj_index++) {
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         if (tex->src[proj_index].src_type == nir_tex_src_projector)
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            break;
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      }
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      if (proj_index == tex->num_srcs)
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         continue;
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      nir_ssa_def *inv_proj =
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         nir_frcp(b, nir_ssa_for_src(b, tex->src[proj_index].src, 1));
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      /* Walk through the sources projecting the arguments. */
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      for (int i = 0; i < tex->num_srcs; i++) {
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         switch (tex->src[i].src_type) {
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         case nir_tex_src_coord:
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         case nir_tex_src_comparitor:
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            break;
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         default:
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            continue;
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         }
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         nir_ssa_def *unprojected =
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            nir_ssa_for_src(b, tex->src[i].src, nir_tex_instr_src_size(tex, i));
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         nir_ssa_def *projected = nir_fmul(b, unprojected, inv_proj);
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         /* Array indices don't get projected, so make an new vector with the
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          * coordinate's array index untouched.
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          */
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         if (tex->is_array && tex->src[i].src_type == nir_tex_src_coord) {
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            switch (tex->coord_components) {
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            case 4:
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               projected = nir_vec4(b,
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                                    channel(b, projected, 0),
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                                    channel(b, projected, 1),
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                                    channel(b, projected, 2),
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                                    channel(b, unprojected, 3));
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               break;
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            case 3:
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               projected = nir_vec3(b,
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                                    channel(b, projected, 0),
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                                    channel(b, projected, 1),
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                                    channel(b, unprojected, 2));
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               break;
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            case 2:
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               projected = nir_vec2(b,
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                                    channel(b, projected, 0),
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                                    channel(b, unprojected, 1));
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               break;
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            default:
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               unreachable("bad texture coord count for array");
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               break;
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            }
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         }
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         nir_instr_rewrite_src(&tex->instr,
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                               &tex->src[i].src,
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                               nir_src_for_ssa(projected));
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      }
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      /* Now move the later tex sources down the array so that the projector
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       * disappears.
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       */
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      nir_instr_rewrite_src(&tex->instr, &tex->src[proj_index].src,
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                            NIR_SRC_INIT);
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      for (int i = proj_index + 1; i < tex->num_srcs; i++) {
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         tex->src[i-1].src_type = tex->src[i].src_type;
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         nir_instr_move_src(&tex->instr, &tex->src[i-1].src, &tex->src[i].src);
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      }
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      tex->num_srcs--;
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   }
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   return true;
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}
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static void
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nir_lower_tex_projector_impl(nir_function_impl *impl)
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{
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   nir_builder b;
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   nir_builder_init(&b, impl);
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   nir_foreach_block(impl, nir_lower_tex_projector_block, &b);
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   nir_metadata_preserve(impl, nir_metadata_block_index |
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                               nir_metadata_dominance);
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}
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void
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nir_lower_tex_projector(nir_shader *shader)
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{
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   nir_foreach_overload(shader, overload) {
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      if (overload->impl)
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         nir_lower_tex_projector_impl(overload->impl);
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   }
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}