| /* |
| * Copyright © 2016 Intel Corporation |
| * |
| * 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. |
| */ |
| |
| #include "nir.h" |
| #include "nir_builder.h" |
| |
| static nir_ssa_def * |
| load_frag_coord(nir_builder *b) |
| { |
| nir_foreach_variable(var, &b->shader->inputs) { |
| if (var->data.location == VARYING_SLOT_POS) |
| return nir_load_var(b, var); |
| } |
| |
| nir_variable *pos = nir_variable_create(b->shader, nir_var_shader_in, |
| glsl_vec4_type(), NULL); |
| pos->data.location = VARYING_SLOT_POS; |
| /** |
| * From Vulkan spec: |
| * "The OriginLowerLeft execution mode must not be used; fragment entry |
| * points must declare OriginUpperLeft." |
| * |
| * So at this point origin_upper_left should be true |
| */ |
| assert(b->shader->info.fs.origin_upper_left == true); |
| |
| return nir_load_var(b, pos); |
| } |
| |
| static bool |
| try_lower_input_load(nir_function_impl *impl, nir_intrinsic_instr *load, |
| bool use_fragcoord_sysval) |
| { |
| nir_deref_instr *deref = nir_src_as_deref(load->src[0]); |
| assert(glsl_type_is_image(deref->type)); |
| |
| enum glsl_sampler_dim image_dim = glsl_get_sampler_dim(deref->type); |
| if (image_dim != GLSL_SAMPLER_DIM_SUBPASS && |
| image_dim != GLSL_SAMPLER_DIM_SUBPASS_MS) |
| return false; |
| |
| const bool multisampled = (image_dim == GLSL_SAMPLER_DIM_SUBPASS_MS); |
| |
| nir_builder b; |
| nir_builder_init(&b, impl); |
| b.cursor = nir_instr_remove(&load->instr); |
| |
| nir_ssa_def *frag_coord = use_fragcoord_sysval ? nir_load_frag_coord(&b) |
| : load_frag_coord(&b); |
| frag_coord = nir_f2i32(&b, frag_coord); |
| nir_ssa_def *offset = nir_ssa_for_src(&b, load->src[1], 2); |
| nir_ssa_def *pos = nir_iadd(&b, frag_coord, offset); |
| |
| nir_ssa_def *layer = nir_load_layer_id(&b); |
| nir_ssa_def *coord = |
| nir_vec3(&b, nir_channel(&b, pos, 0), nir_channel(&b, pos, 1), layer); |
| |
| nir_tex_instr *tex = nir_tex_instr_create(b.shader, 3 + multisampled); |
| |
| tex->op = nir_texop_txf; |
| tex->sampler_dim = image_dim; |
| |
| switch (glsl_get_sampler_result_type(deref->type)) { |
| case GLSL_TYPE_FLOAT: |
| tex->dest_type = nir_type_float; |
| break; |
| case GLSL_TYPE_INT: |
| tex->dest_type = nir_type_int; |
| break; |
| case GLSL_TYPE_UINT: |
| tex->dest_type = nir_type_uint; |
| break; |
| default: |
| unreachable("Invalid image type"); |
| } |
| tex->is_array = true; |
| tex->is_shadow = false; |
| |
| tex->texture_index = 0; |
| tex->sampler_index = 0; |
| |
| tex->src[0].src_type = nir_tex_src_texture_deref; |
| tex->src[0].src = nir_src_for_ssa(&deref->dest.ssa); |
| |
| tex->src[1].src_type = nir_tex_src_coord; |
| tex->src[1].src = nir_src_for_ssa(coord); |
| tex->coord_components = 3; |
| |
| tex->src[2].src_type = nir_tex_src_lod; |
| tex->src[2].src = nir_src_for_ssa(nir_imm_int(&b, 0)); |
| |
| if (image_dim == GLSL_SAMPLER_DIM_SUBPASS_MS) { |
| tex->op = nir_texop_txf_ms; |
| tex->src[3].src_type = nir_tex_src_ms_index; |
| tex->src[3].src = load->src[2]; |
| } |
| |
| tex->texture_non_uniform = nir_intrinsic_access(load) & ACCESS_NON_UNIFORM; |
| |
| nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL); |
| nir_builder_instr_insert(&b, &tex->instr); |
| |
| nir_ssa_def_rewrite_uses(&load->dest.ssa, |
| nir_src_for_ssa(&tex->dest.ssa)); |
| |
| return true; |
| } |
| |
| bool |
| nir_lower_input_attachments(nir_shader *shader, bool use_fragcoord_sysval) |
| { |
| assert(shader->info.stage == MESA_SHADER_FRAGMENT); |
| bool progress = false; |
| |
| nir_foreach_function(function, shader) { |
| if (!function->impl) |
| continue; |
| |
| nir_foreach_block(block, function->impl) { |
| nir_foreach_instr_safe(instr, block) { |
| if (instr->type != nir_instr_type_intrinsic) |
| continue; |
| |
| nir_intrinsic_instr *load = nir_instr_as_intrinsic(instr); |
| |
| if (load->intrinsic != nir_intrinsic_image_deref_load) |
| continue; |
| |
| progress |= try_lower_input_load(function->impl, load, |
| use_fragcoord_sysval); |
| } |
| } |
| } |
| |
| return progress; |
| } |