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IABSD.fr/xenocara/lib/mesa/src/intel/compiler/intel_nir_lower_texture.c
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- lib/mesa/src/intel/compiler/intel_nir_lower_texture.c
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/* * Copyright © 2024 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 "compiler/nir/nir_builder.h" #include "intel_nir.h" /** * Pack either the explicit LOD or LOD bias and the array index together. */ static bool pack_lod_and_array_index(nir_builder *b, nir_tex_instr *tex) { /* If 32-bit texture coordinates are used, pack either the explicit LOD or * LOD bias and the array index into a single (32-bit) value. */ int lod_index = nir_tex_instr_src_index(tex, nir_tex_src_lod); if (lod_index < 0) { lod_index = nir_tex_instr_src_index(tex, nir_tex_src_bias); /* The explicit LOD or LOD bias may not be found if this lowering has * already occured. The explicit LOD may also not be found in some * cases where it is zero. */ if (lod_index < 0) return false; } assert(nir_tex_instr_src_type(tex, lod_index) == nir_type_float); /* Also do not perform this packing if the explicit LOD is zero. */ if (tex->op == nir_texop_txl && nir_src_is_const(tex->src[lod_index].src) && nir_src_as_float(tex->src[lod_index].src) == 0.0) { return false; } const int coord_index = nir_tex_instr_src_index(tex, nir_tex_src_coord); assert(coord_index >= 0); nir_def *lod = tex->src[lod_index].src.ssa; nir_def *coord = tex->src[coord_index].src.ssa; assert(nir_tex_instr_src_type(tex, coord_index) == nir_type_float); if (coord->bit_size < 32) return false; b->cursor = nir_before_instr(&tex->instr); /* First, combine the two values. The packing format is a little weird. * The explicit LOD / LOD bias is stored as float, as normal. However, the * array index is converted to an integer and smashed into the low 9 bits. */ const unsigned array_index = tex->coord_components - 1; nir_def *clamped_ai = nir_umin(b, nir_f2u32(b, nir_fround_even(b, nir_channel(b, coord, array_index))), nir_imm_int(b, 511)); nir_def *lod_ai = nir_ior(b, nir_iand_imm(b, lod, 0xfffffe00), clamped_ai); /* Second, replace the coordinate with a new value that has one fewer * component (i.e., drop the array index). */ nir_def *reduced_coord = nir_trim_vector(b, coord, tex->coord_components - 1); tex->coord_components--; /* Finally, remove the old sources and add the new. */ nir_src_rewrite(&tex->src[coord_index].src, reduced_coord); nir_tex_instr_remove_src(tex, lod_index); nir_tex_instr_add_src(tex, nir_tex_src_backend1, lod_ai); return true; } /** * Pack either the explicit LOD/Bias and the offset together. */ static bool pack_lod_or_bias_and_offset(nir_builder *b, nir_tex_instr *tex) { int offset_index = nir_tex_instr_src_index(tex, nir_tex_src_offset); if (offset_index < 0) return false; /* If 32-bit texture coordinates are used, pack either the explicit LOD or * LOD bias and the array index into a single (32-bit) value. */ int lod_index = nir_tex_instr_src_index(tex, nir_tex_src_lod); if (lod_index < 0) { lod_index = nir_tex_instr_src_index(tex, nir_tex_src_bias); /* The explicit LOD or LOD bias may not be found if this lowering has * already occured. The explicit LOD may also not be found in some * cases where it is zero. */ if (lod_index < 0) return false; } assert(nir_tex_instr_src_type(tex, lod_index) == nir_type_float); /* Also do not perform this packing if the explicit LOD is zero. */ if (nir_src_is_const(tex->src[lod_index].src) && nir_src_as_float(tex->src[lod_index].src) == 0.0) { return false; } nir_def *lod = tex->src[lod_index].src.ssa; nir_def *offset = tex->src[offset_index].src.ssa; b->cursor = nir_before_instr(&tex->instr); /* When using the programmable offsets instruction gather4_po_l_c with * SIMD16 or SIMD32 the U, V offsets are combined with LOD/bias parameters * on the 12 LSBs. For the offset parameters on gather instructions the 6 * least significant bits are honored as signed value with a range * [-32..31]. * * Pack Offset U, and V for texture gather with offsets. * * ------------------------------------------ * |Bits | [31:12] | [11:6] | [5:0] | * ------------------------------------------ * |OffsetUV | LOD/Bias | OffsetV | OffsetU | * ------------------------------------------ */ nir_def *offu = nir_iand_imm(b, nir_channel(b, offset, 0), 0x3F); nir_def *offv = nir_iand_imm(b, nir_channel(b, offset, 1), 0x3F); nir_def *offsetUV = nir_ior(b, offu, nir_ishl_imm(b, offv, 6)); nir_def *lod_offsetUV = nir_ior(b, offsetUV, nir_iand_imm(b, lod, 0xFFFFF000)); nir_tex_instr_remove_src(tex, offset_index); nir_tex_instr_add_src(tex, nir_tex_src_backend2, lod_offsetUV); return true; } static bool intel_nir_lower_texture_instr(nir_builder *b, nir_instr *instr, void *cb_data) { if (instr->type != nir_instr_type_tex) return false; const struct intel_nir_lower_texture_opts *opts = cb_data; nir_tex_instr *tex = nir_instr_as_tex(instr); switch (tex->op) { case nir_texop_txl: case nir_texop_txb: case nir_texop_tg4: if (tex->is_array && tex->sampler_dim == GLSL_SAMPLER_DIM_CUBE && opts->combined_lod_and_array_index) { return pack_lod_and_array_index(b, tex); } if (tex->op == nir_texop_tg4 && opts->combined_lod_or_bias_and_offset) { return pack_lod_or_bias_and_offset(b, tex); } return false; default: /* Nothing to do */ return false; } return false; } bool intel_nir_lower_texture(nir_shader *shader, const struct intel_nir_lower_texture_opts *opts) { return nir_shader_instructions_pass(shader, intel_nir_lower_texture_instr, nir_metadata_none, (void *)opts); }