| /* |
| * Copyright © 2020 Collabora, Ltd. |
| * |
| * 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. |
| * |
| * Authors: |
| * Erik Faye-Lund <erik.faye-lund@collabora.com> |
| */ |
| |
| #include "nir.h" |
| #include "nir_builder.h" |
| #include "nir_deref.h" |
| |
| static nir_ssa_def * |
| get_io_index(nir_builder *b, nir_deref_instr *deref) |
| { |
| nir_deref_path path; |
| nir_deref_path_init(&path, deref, NULL); |
| |
| assert(path.path[0]->deref_type == nir_deref_type_var); |
| nir_deref_instr **p = &path.path[1]; |
| |
| /* Just emit code and let constant-folding go to town */ |
| nir_ssa_def *offset = nir_imm_int(b, 0); |
| |
| for (; *p; p++) { |
| if ((*p)->deref_type == nir_deref_type_array) { |
| unsigned size = glsl_get_length((*p)->type); |
| |
| nir_ssa_def *mul = |
| nir_amul_imm(b, nir_ssa_for_src(b, (*p)->arr.index, 1), size); |
| |
| offset = nir_iadd(b, offset, mul); |
| } else |
| unreachable("Unsupported deref type"); |
| } |
| |
| nir_deref_path_finish(&path); |
| |
| return offset; |
| } |
| |
| static void |
| nir_lower_texcoord_replace_impl(nir_function_impl *impl, |
| unsigned coord_replace, |
| bool point_coord_is_sysval, |
| bool yinvert) |
| { |
| nir_builder b; |
| |
| nir_builder_init(&b, impl); |
| b.cursor = nir_before_cf_list(&impl->body); |
| |
| nir_ssa_def *new_coord; |
| if (point_coord_is_sysval) { |
| new_coord = nir_load_system_value(&b, nir_intrinsic_load_point_coord, |
| 0, 2, 32); |
| } else { |
| /* find or create pntc */ |
| nir_variable *pntc = nir_find_variable_with_location(b.shader, |
| nir_var_shader_in, |
| VARYING_SLOT_PNTC); |
| if (!pntc) { |
| pntc = nir_variable_create(b.shader, nir_var_shader_in, |
| glsl_vec_type(2), "gl_PointCoord"); |
| pntc->data.location = VARYING_SLOT_PNTC; |
| pntc->data.driver_location = b.shader->num_inputs++; |
| b.shader->info.inputs_read |= BITFIELD64_BIT(VARYING_SLOT_PNTC); |
| } |
| |
| new_coord = nir_load_var(&b, pntc); |
| } |
| |
| /* point-coord is two-component, need to add two implicit ones in case of |
| * projective texturing etc. |
| */ |
| nir_ssa_def *zero = nir_imm_zero(&b, 1, new_coord->bit_size); |
| nir_ssa_def *one = nir_imm_floatN_t(&b, 1.0, new_coord->bit_size); |
| nir_ssa_def *y = nir_channel(&b, new_coord, 1); |
| if (yinvert) |
| y = nir_fsub(&b, nir_imm_float(&b, 1.0), y); |
| new_coord = nir_vec4(&b, nir_channel(&b, new_coord, 0), |
| y, |
| zero, one); |
| |
| nir_foreach_block(block, impl) { |
| nir_foreach_instr_safe(instr, block) { |
| if (instr->type != nir_instr_type_intrinsic) |
| continue; |
| |
| nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr); |
| if (intrin->intrinsic != nir_intrinsic_load_deref) |
| continue; |
| |
| nir_variable *var = nir_intrinsic_get_var(intrin, 0); |
| if (var->data.mode != nir_var_shader_in || |
| var->data.location < VARYING_SLOT_TEX0 || |
| var->data.location > VARYING_SLOT_TEX7) |
| continue; |
| unsigned base = var->data.location - VARYING_SLOT_TEX0; |
| |
| b.cursor = nir_after_instr(instr); |
| nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]); |
| nir_ssa_def *index = get_io_index(&b, deref); |
| nir_ssa_def *mask = |
| nir_ishl(&b, nir_imm_int(&b, 1), |
| nir_iadd_imm(&b, index, base)); |
| |
| nir_ssa_def *cond = nir_test_mask(&b, mask, coord_replace); |
| nir_ssa_def *result = nir_bcsel(&b, cond, new_coord, |
| &intrin->dest.ssa); |
| |
| nir_ssa_def_rewrite_uses_after(&intrin->dest.ssa, |
| result, |
| result->parent_instr); |
| } |
| } |
| |
| nir_metadata_preserve(impl, nir_metadata_block_index | |
| nir_metadata_dominance); |
| } |
| |
| void |
| nir_lower_texcoord_replace(nir_shader *s, unsigned coord_replace, |
| bool point_coord_is_sysval, bool yinvert) |
| { |
| assert(s->info.stage == MESA_SHADER_FRAGMENT); |
| assert(coord_replace != 0); |
| |
| nir_foreach_function(function, s) { |
| if (function->impl) |
| nir_lower_texcoord_replace_impl(function->impl, coord_replace, |
| point_coord_is_sysval, yinvert); |
| } |
| } |