/* * Copyright © 2013 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. */ /** * \file lower_offset_array.cpp * * IR lower pass to decompose ir_texture ir_tg4 with an array of offsets * into four ir_tg4s with a single ivec2 offset, select the .w component of each, * and return those four values packed into a gvec4. * * \author Chris Forbes <chrisf@ijw.co.nz> */ #include "glsl_types.h" #include "ir.h" #include "ir_builder.h" #include "ir_optimization.h" #include "ir_rvalue_visitor.h" using namespace ir_builder; class lower_offset_array_visitor : public ir_rvalue_visitor { public: lower_offset_array_visitor() { progress = false; } void handle_rvalue(ir_rvalue **rv); bool progress; }; void lower_offset_array_visitor::handle_rvalue(ir_rvalue **rv) { if (*rv == NULL || (*rv)->ir_type != ir_type_texture) return; ir_texture *ir = (ir_texture *) *rv; if (ir->op != ir_tg4 || !ir->offset || !ir->offset->type->is_array()) return; void *mem_ctx = ralloc_parent(ir); ir_variable *var = new (mem_ctx) ir_variable(ir->type, "result", ir_var_temporary); base_ir->insert_before(var); for (int i = 0; i < 4; i++) { ir_texture *tex = ir->clone(mem_ctx, NULL); tex->offset = new (mem_ctx) ir_dereference_array(tex->offset, new (mem_ctx) ir_constant(i)); base_ir->insert_before(assign(var, swizzle_w(tex), 1 << i)); } *rv = new (mem_ctx) ir_dereference_variable(var); progress = true; } bool lower_offset_arrays(exec_list *instructions) { lower_offset_array_visitor v; visit_list_elements(&v, instructions); return v.progress; }