1aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt/* 2aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * Copyright © 2010 Intel Corporation 3aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * 4aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * Permission is hereby granted, free of charge, to any person obtaining a 5aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * copy of this software and associated documentation files (the "Software"), 6aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * to deal in the Software without restriction, including without limitation 7aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * and/or sell copies of the Software, and to permit persons to whom the 9aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * Software is furnished to do so, subject to the following conditions: 10aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * 11aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * The above copyright notice and this permission notice (including the next 12aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * paragraph) shall be included in all copies or substantial portions of the 13aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * Software. 14aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * 15aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * DEALINGS IN THE SOFTWARE. 22aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt */ 23aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 24aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt/** 25aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * \file lower_texture_projection.cpp 26aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * 27aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * IR lower pass to perform the division of texture coordinates by the texture 28aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * projector if present. 29aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * 30aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * Many GPUs have a texture sampling opcode that takes the projector 31aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * and does the divide internally, thus the presence of the projector 32aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * in the IR. For GPUs that don't, this saves the driver needing the 33aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * logic for handling the divide. 34aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * 35aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt * \author Eric Anholt <eric@anholt.net> 36aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt */ 37aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 38aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt#include "ir.h" 39aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 40aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholtclass lower_texture_projection_visitor : public ir_hierarchical_visitor { 41aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholtpublic: 42aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt lower_texture_projection_visitor() 43aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt { 44aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt progress = false; 45aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt } 46aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 47aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir_visitor_status visit_leave(ir_texture *ir); 48aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 49aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt bool progress; 50aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt}; 51aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 52aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholtir_visitor_status 53aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholtlower_texture_projection_visitor::visit_leave(ir_texture *ir) 54aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt{ 55aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt if (!ir->projector) 56aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt return visit_continue; 57aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 58d3073f58c17d8675a2ecdd5dfa83e5520c78e1a8Kenneth Graunke void *mem_ctx = ralloc_parent(ir); 59aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 60aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir_variable *var = new(mem_ctx) ir_variable(ir->projector->type, 61aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt "projector", ir_var_auto); 62aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt base_ir->insert_before(var); 63aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir_dereference *deref = new(mem_ctx) ir_dereference_variable(var); 64aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir_expression *expr = new(mem_ctx) ir_expression(ir_unop_rcp, 65aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir->projector->type, 66aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir->projector, 67aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt NULL); 68aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir_assignment *assign = new(mem_ctx) ir_assignment(deref, expr, NULL); 69aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt base_ir->insert_before(assign); 70aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 71aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt deref = new(mem_ctx) ir_dereference_variable(var); 72aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir->coordinate = new(mem_ctx) ir_expression(ir_binop_mul, 73aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir->coordinate->type, 74aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir->coordinate, 75aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt deref); 76aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 77aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt if (ir->shadow_comparitor) { 78aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt deref = new(mem_ctx) ir_dereference_variable(var); 79aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir->shadow_comparitor = new(mem_ctx) ir_expression(ir_binop_mul, 80aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir->shadow_comparitor->type, 81aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir->shadow_comparitor, 82aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt deref); 83aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt } 84aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 85aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt ir->projector = NULL; 86aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 87aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt progress = true; 88aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt return visit_continue; 89aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt} 90aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 91aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholtbool 92aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholtdo_lower_texture_projection(exec_list *instructions) 93aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt{ 94aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt lower_texture_projection_visitor v; 95aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 96aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt visit_list_elements(&v, instructions); 97aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt 98aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt return v.progress; 99aae338104fa6022b8b1d6b22c7ad1115b252b9b6Eric Anholt} 100