1 /* 2 * Copyright 2010 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 */ 23 24 /** 25 * \file brw_cubemap_normalize.cpp 26 * 27 * IR lower pass to perform the normalization of the cubemap coordinates to 28 * have the largest magnitude component be -1.0 or 1.0. 29 * 30 * \author Eric Anholt <eric (at) anholt.net> 31 */ 32 33 #include "glsl/glsl_types.h" 34 #include "glsl/ir.h" 35 36 class brw_cubemap_normalize_visitor : public ir_hierarchical_visitor { 37 public: 38 brw_cubemap_normalize_visitor() 39 { 40 progress = false; 41 } 42 43 ir_visitor_status visit_leave(ir_texture *ir); 44 45 bool progress; 46 }; 47 48 ir_visitor_status 49 brw_cubemap_normalize_visitor::visit_leave(ir_texture *ir) 50 { 51 if (ir->sampler->type->sampler_dimensionality != GLSL_SAMPLER_DIM_CUBE) 52 return visit_continue; 53 54 if (ir->op == ir_txs) 55 return visit_continue; 56 57 void *mem_ctx = ralloc_parent(ir); 58 59 ir_variable *var = new(mem_ctx) ir_variable(ir->coordinate->type, 60 "coordinate", ir_var_auto); 61 base_ir->insert_before(var); 62 ir_dereference *deref = new(mem_ctx) ir_dereference_variable(var); 63 ir_assignment *assign = new(mem_ctx) ir_assignment(deref, ir->coordinate, 64 NULL); 65 base_ir->insert_before(assign); 66 67 deref = new(mem_ctx) ir_dereference_variable(var); 68 ir_rvalue *swiz0 = new(mem_ctx) ir_swizzle(deref, 0, 0, 0, 0, 1); 69 deref = new(mem_ctx) ir_dereference_variable(var); 70 ir_rvalue *swiz1 = new(mem_ctx) ir_swizzle(deref, 1, 0, 0, 0, 1); 71 deref = new(mem_ctx) ir_dereference_variable(var); 72 ir_rvalue *swiz2 = new(mem_ctx) ir_swizzle(deref, 2, 0, 0, 0, 1); 73 74 swiz0 = new(mem_ctx) ir_expression(ir_unop_abs, swiz0->type, swiz0, NULL); 75 swiz1 = new(mem_ctx) ir_expression(ir_unop_abs, swiz1->type, swiz1, NULL); 76 swiz2 = new(mem_ctx) ir_expression(ir_unop_abs, swiz2->type, swiz2, NULL); 77 78 ir_expression *expr; 79 expr = new(mem_ctx) ir_expression(ir_binop_max, 80 glsl_type::float_type, 81 swiz0, swiz1); 82 83 expr = new(mem_ctx) ir_expression(ir_binop_max, 84 glsl_type::float_type, 85 expr, swiz2); 86 87 expr = new(mem_ctx) ir_expression(ir_unop_rcp, 88 glsl_type::float_type, 89 expr, NULL); 90 91 deref = new(mem_ctx) ir_dereference_variable(var); 92 ir->coordinate = new(mem_ctx) ir_expression(ir_binop_mul, 93 ir->coordinate->type, 94 deref, 95 expr); 96 97 progress = true; 98 return visit_continue; 99 } 100 101 extern "C" { 102 103 bool 104 brw_do_cubemap_normalize(exec_list *instructions) 105 { 106 brw_cubemap_normalize_visitor v; 107 108 visit_list_elements(&v, instructions); 109 110 return v.progress; 111 } 112 113 } 114
