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      1 /*
      2  * Copyright  2016 Intel Corporation
      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 #include "anv_nir.h"
     25 #include "nir/nir_builder.h"
     26 
     27 static nir_ssa_def *
     28 load_frag_coord(nir_builder *b)
     29 {
     30    nir_foreach_variable(var, &b->shader->inputs) {
     31       if (var->data.location == VARYING_SLOT_POS)
     32          return nir_load_var(b, var);
     33    }
     34 
     35    nir_variable *pos = nir_variable_create(b->shader, nir_var_shader_in,
     36                                            glsl_vec4_type(), NULL);
     37    pos->data.location = VARYING_SLOT_POS;
     38    pos->data.origin_upper_left = true;
     39 
     40    return nir_load_var(b, pos);
     41 }
     42 
     43 static void
     44 try_lower_input_load(nir_function_impl *impl, nir_intrinsic_instr *load)
     45 {
     46 
     47    const struct glsl_type *image_type =
     48       glsl_without_array(load->variables[0]->var->type);
     49    enum glsl_sampler_dim image_dim = glsl_get_sampler_dim(image_type);
     50    if (image_dim != GLSL_SAMPLER_DIM_SUBPASS &&
     51        image_dim != GLSL_SAMPLER_DIM_SUBPASS_MS)
     52       return;
     53 
     54    const bool multisampled = (image_dim == GLSL_SAMPLER_DIM_SUBPASS_MS);
     55 
     56    nir_builder b;
     57    nir_builder_init(&b, impl);
     58    b.cursor = nir_before_instr(&load->instr);
     59 
     60    nir_ssa_def *frag_coord = nir_f2i(&b, load_frag_coord(&b));
     61    nir_ssa_def *offset = nir_ssa_for_src(&b, load->src[0], 2);
     62    nir_ssa_def *pos = nir_iadd(&b, frag_coord, offset);
     63 
     64    nir_ssa_def *layer =
     65       nir_load_system_value(&b, nir_intrinsic_load_layer_id, 0);
     66    nir_ssa_def *coord =
     67       nir_vec3(&b, nir_channel(&b, pos, 0), nir_channel(&b, pos, 1), layer);
     68 
     69    nir_tex_instr *tex = nir_tex_instr_create(b.shader, 2 + multisampled);
     70 
     71    tex->op = nir_texop_txf;
     72 
     73    switch (glsl_get_sampler_result_type(image_type)) {
     74    case GLSL_TYPE_FLOAT:
     75       tex->dest_type = nir_type_float;
     76       break;
     77    case GLSL_TYPE_INT:
     78       tex->dest_type = nir_type_int;
     79       break;
     80    case GLSL_TYPE_UINT:
     81       tex->dest_type = nir_type_uint;
     82       break;
     83    default:
     84       unreachable("Invalid image type");
     85    }
     86    tex->is_array = true;
     87    tex->is_shadow = false;
     88 
     89    tex->texture = nir_deref_var_clone(load->variables[0], tex);
     90    tex->sampler = NULL;
     91    tex->texture_index = 0;
     92    tex->sampler_index = 0;
     93 
     94    tex->src[0].src_type = nir_tex_src_coord;
     95    tex->src[0].src = nir_src_for_ssa(coord);
     96    tex->coord_components = 3;
     97 
     98    tex->src[1].src_type = nir_tex_src_lod;
     99    tex->src[1].src = nir_src_for_ssa(nir_imm_int(&b, 0));
    100 
    101    if (image_dim == GLSL_SAMPLER_DIM_SUBPASS_MS) {
    102       tex->op = nir_texop_txf_ms;
    103       tex->src[2].src_type = nir_tex_src_ms_index;
    104       tex->src[2].src = load->src[1];
    105    }
    106 
    107    nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL);
    108    nir_builder_instr_insert(&b, &tex->instr);
    109 
    110    nir_ssa_def_rewrite_uses(&load->dest.ssa,
    111                             nir_src_for_ssa(&tex->dest.ssa));
    112 }
    113 
    114 void
    115 anv_nir_lower_input_attachments(nir_shader *shader)
    116 {
    117    assert(shader->stage == MESA_SHADER_FRAGMENT);
    118 
    119    nir_foreach_function(function, shader) {
    120       if (!function->impl)
    121          continue;
    122 
    123       nir_foreach_block(block, function->impl) {
    124          nir_foreach_instr(instr, block) {
    125             if (instr->type != nir_instr_type_intrinsic)
    126                continue;
    127 
    128             nir_intrinsic_instr *load = nir_instr_as_intrinsic(instr);
    129 
    130             if (load->intrinsic != nir_intrinsic_image_load)
    131                continue;
    132 
    133             try_lower_input_load(function->impl, load);
    134          }
    135       }
    136    }
    137 }
    138