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  1. /*
  2.  * Copyright © 2015 Broadcom
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21.  * IN THE SOFTWARE.
  22.  */
  23.  
  24. /*
  25.  * This lowering pass converts the coordinate division for texture projection
  26.  * to be done in ALU instructions instead of asking the texture operation to
  27.  * do so.
  28.  */
  29.  
  30. #include "nir.h"
  31. #include "nir_builder.h"
  32.  
  33. static nir_ssa_def *
  34. channel(nir_builder *b, nir_ssa_def *def, int c)
  35. {
  36.    return nir_swizzle(b, def, (unsigned[4]){c, c, c, c}, 1, false);
  37. }
  38.  
  39. static bool
  40. nir_lower_tex_projector_block(nir_block *block, void *void_state)
  41. {
  42.    nir_builder *b = void_state;
  43.  
  44.    nir_foreach_instr_safe(block, instr) {
  45.       if (instr->type != nir_instr_type_tex)
  46.          continue;
  47.  
  48.       nir_tex_instr *tex = nir_instr_as_tex(instr);
  49.       nir_builder_insert_before_instr(b, &tex->instr);
  50.  
  51.       /* Find the projector in the srcs list, if present. */
  52.       int proj_index;
  53.       for (proj_index = 0; proj_index < tex->num_srcs; proj_index++) {
  54.          if (tex->src[proj_index].src_type == nir_tex_src_projector)
  55.             break;
  56.       }
  57.       if (proj_index == tex->num_srcs)
  58.          continue;
  59.       nir_ssa_def *inv_proj =
  60.          nir_frcp(b, nir_ssa_for_src(b, tex->src[proj_index].src, 1));
  61.  
  62.       /* Walk through the sources projecting the arguments. */
  63.       for (int i = 0; i < tex->num_srcs; i++) {
  64.          switch (tex->src[i].src_type) {
  65.          case nir_tex_src_coord:
  66.          case nir_tex_src_comparitor:
  67.             break;
  68.          default:
  69.             continue;
  70.          }
  71.          nir_ssa_def *unprojected =
  72.             nir_ssa_for_src(b, tex->src[i].src, nir_tex_instr_src_size(tex, i));
  73.          nir_ssa_def *projected = nir_fmul(b, unprojected, inv_proj);
  74.  
  75.          /* Array indices don't get projected, so make an new vector with the
  76.           * coordinate's array index untouched.
  77.           */
  78.          if (tex->is_array && tex->src[i].src_type == nir_tex_src_coord) {
  79.             switch (tex->coord_components) {
  80.             case 4:
  81.                projected = nir_vec4(b,
  82.                                     channel(b, projected, 0),
  83.                                     channel(b, projected, 1),
  84.                                     channel(b, projected, 2),
  85.                                     channel(b, unprojected, 3));
  86.                break;
  87.             case 3:
  88.                projected = nir_vec3(b,
  89.                                     channel(b, projected, 0),
  90.                                     channel(b, projected, 1),
  91.                                     channel(b, unprojected, 2));
  92.                break;
  93.             case 2:
  94.                projected = nir_vec2(b,
  95.                                     channel(b, projected, 0),
  96.                                     channel(b, unprojected, 1));
  97.                break;
  98.             default:
  99.                unreachable("bad texture coord count for array");
  100.                break;
  101.             }
  102.          }
  103.  
  104.          nir_instr_rewrite_src(&tex->instr,
  105.                                &tex->src[i].src,
  106.                                nir_src_for_ssa(projected));
  107.       }
  108.  
  109.       /* Now move the later tex sources down the array so that the projector
  110.        * disappears.
  111.        */
  112.       nir_instr_rewrite_src(&tex->instr, &tex->src[proj_index].src,
  113.                             NIR_SRC_INIT);
  114.       for (int i = proj_index + 1; i < tex->num_srcs; i++) {
  115.          tex->src[i-1].src_type = tex->src[i].src_type;
  116.          nir_instr_move_src(&tex->instr, &tex->src[i-1].src, &tex->src[i].src);
  117.       }
  118.       tex->num_srcs--;
  119.    }
  120.  
  121.    return true;
  122. }
  123.  
  124. static void
  125. nir_lower_tex_projector_impl(nir_function_impl *impl)
  126. {
  127.    nir_builder b;
  128.    nir_builder_init(&b, impl);
  129.  
  130.    nir_foreach_block(impl, nir_lower_tex_projector_block, &b);
  131.  
  132.    nir_metadata_preserve(impl, nir_metadata_block_index |
  133.                                nir_metadata_dominance);
  134. }
  135.  
  136. void
  137. nir_lower_tex_projector(nir_shader *shader)
  138. {
  139.    nir_foreach_overload(shader, overload) {
  140.       if (overload->impl)
  141.          nir_lower_tex_projector_impl(overload->impl);
  142.    }
  143. }
  144.