/* * Copyright © 2019 Igalia S.L. * * 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 "ir3_nir.h" /** * A pass which detects tex instructions which are candidate to be executed * prior to FS shader start, and change them to nir_texop_tex_prefetch. */ static int coord_offset(nir_ssa_def *ssa) { nir_instr *parent_instr = ssa->parent_instr; /* The coordinate of a texture sampling instruction eligible for * pre-fetch is either going to be a load_interpolated_input/ * load_input, or a vec2 assembling non-swizzled components of * a load_interpolated_input/load_input (due to varying packing) */ if (parent_instr->type == nir_instr_type_alu) { nir_alu_instr *alu = nir_instr_as_alu(parent_instr); if (alu->op != nir_op_vec2) return -1; if (!alu->src[0].src.is_ssa) return -1; int base_offset = coord_offset(alu->src[0].src.ssa) + alu->src[0].swizzle[0]; /* NOTE it might be possible to support more than 2D? */ for (int i = 1; i < 2; i++) { if (!alu->src[i].src.is_ssa) return -1; int nth_offset = coord_offset(alu->src[i].src.ssa) + alu->src[i].swizzle[0]; if (nth_offset != (base_offset + i)) return -1; } return base_offset; } if (parent_instr->type != nir_instr_type_intrinsic) return -1; nir_intrinsic_instr *input = nir_instr_as_intrinsic(parent_instr); if (input->intrinsic != nir_intrinsic_load_interpolated_input) return -1; /* limit to load_barycentric_pixel, other interpolation modes don't seem * to be supported: */ if (!input->src[0].is_ssa) return -1; nir_intrinsic_instr *interp = nir_instr_as_intrinsic(input->src[0].ssa->parent_instr); if (interp->intrinsic != nir_intrinsic_load_barycentric_pixel) return -1; /* we also need a const input offset: */ if (!nir_src_is_const(input->src[1])) return -1; unsigned base = nir_src_as_uint(input->src[1]) + nir_intrinsic_base(input); unsigned comp = nir_intrinsic_component(input); return (4 * base) + comp; } int ir3_nir_coord_offset(nir_ssa_def *ssa) { assert (ssa->num_components == 2); return coord_offset(ssa); } static bool has_src(nir_tex_instr *tex, nir_tex_src_type type) { return nir_tex_instr_src_index(tex, type) > 0; } static bool lower_tex_prefetch_block(nir_block *block) { bool progress = false; nir_foreach_instr_safe(instr, block) { if (instr->type != nir_instr_type_tex) continue; nir_tex_instr *tex = nir_instr_as_tex(instr); if (tex->op != nir_texop_tex) continue; if (has_src(tex, nir_tex_src_bias) || has_src(tex, nir_tex_src_lod) || has_src(tex, nir_tex_src_comparator) || has_src(tex, nir_tex_src_projector) || has_src(tex, nir_tex_src_offset) || has_src(tex, nir_tex_src_ddx) || has_src(tex, nir_tex_src_ddy) || has_src(tex, nir_tex_src_ms_index) || has_src(tex, nir_tex_src_texture_offset) || has_src(tex, nir_tex_src_sampler_offset)) continue; /* only prefetch for simple 2d tex fetch case */ if (tex->sampler_dim != GLSL_SAMPLER_DIM_2D || tex->is_array) continue; int idx = nir_tex_instr_src_index(tex, nir_tex_src_coord); /* First source should be the sampling coordinate. */ nir_tex_src *coord = &tex->src[idx]; debug_assert(coord->src.is_ssa); if (ir3_nir_coord_offset(coord->src.ssa) >= 0) { tex->op = nir_texop_tex_prefetch; progress |= true; } } return progress; } static bool lower_tex_prefetch_func(nir_function_impl *impl) { /* Only instructions in the the outer-most block are considered * eligible for pre-dispatch, because they need to be move-able * to the beginning of the shader to avoid locking down the * register holding the pre-fetched result for too long. */ nir_block *block = nir_start_block(impl); if (!block) return false; bool progress = lower_tex_prefetch_block(block); if (progress) { nir_metadata_preserve(impl, nir_metadata_block_index | nir_metadata_dominance); } return progress; } bool ir3_nir_lower_tex_prefetch(nir_shader *shader) { bool progress = false; assert(shader->info.stage == MESA_SHADER_FRAGMENT); nir_foreach_function(function, shader) { /* Only texture sampling instructions inside the main function * are eligible for pre-dispatch. */ if (!function->impl || !function->is_entrypoint) continue; progress |= lower_tex_prefetch_func(function->impl); } return progress; }