/* * Copyright © 2010 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_texture_projection.cpp * * IR lower pass to perform the division of texture coordinates by the texture * projector if present. * * Many GPUs have a texture sampling opcode that takes the projector * and does the divide internally, thus the presence of the projector * in the IR. For GPUs that don't, this saves the driver needing the * logic for handling the divide. * * \author Eric Anholt <eric@anholt.net> */ #include "ir.h" namespace { class lower_texture_projection_visitor : public ir_hierarchical_visitor { public: lower_texture_projection_visitor() { progress = false; } ir_visitor_status visit_leave(ir_texture *ir); bool progress; }; } /* anonymous namespace */ ir_visitor_status lower_texture_projection_visitor::visit_leave(ir_texture *ir) { if (!ir->projector) return visit_continue; void *mem_ctx = ralloc_parent(ir); ir_variable *var = new(mem_ctx) ir_variable(ir->projector->type, "projector", ir_var_temporary); base_ir->insert_before(var); ir_dereference *deref = new(mem_ctx) ir_dereference_variable(var); ir_expression *expr = new(mem_ctx) ir_expression(ir_unop_rcp, ir->projector->type, ir->projector, NULL); ir_assignment *assign = new(mem_ctx) ir_assignment(deref, expr, NULL); base_ir->insert_before(assign); deref = new(mem_ctx) ir_dereference_variable(var); ir->coordinate = new(mem_ctx) ir_expression(ir_binop_mul, ir->coordinate->type, ir->coordinate, deref); if (ir->shadow_comparator) { deref = new(mem_ctx) ir_dereference_variable(var); ir->shadow_comparator = new(mem_ctx) ir_expression(ir_binop_mul, ir->shadow_comparator->type, ir->shadow_comparator, deref); } ir->projector = NULL; progress = true; return visit_continue; } bool do_lower_texture_projection(exec_list *instructions) { lower_texture_projection_visitor v; visit_list_elements(&v, instructions); return v.progress; }