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 "compiler/glsl_types.h" 34 #include "compiler/glsl/ir.h" 35 #include "program/prog_instruction.h" /* For WRITEMASK_* */ 36 37 class brw_cubemap_normalize_visitor : public ir_hierarchical_visitor { 38 public: 39 brw_cubemap_normalize_visitor() 40 { 41 progress = false; 42 } 43 44 ir_visitor_status visit_leave(ir_texture *ir); 45 46 bool progress; 47 }; 48 49 ir_visitor_status 50 brw_cubemap_normalize_visitor::visit_leave(ir_texture *ir) 51 { 52 if (ir->sampler->type->sampler_dimensionality != GLSL_SAMPLER_DIM_CUBE) 53 return visit_continue; 54 55 if (!ir->coordinate) 56 return visit_continue; 57 58 void *mem_ctx = ralloc_parent(ir); 59 60 ir_variable *var = new(mem_ctx) ir_variable(ir->coordinate->type, 61 "coordinate", ir_var_auto); 62 base_ir->insert_before(var); 63 ir_dereference *deref = new(mem_ctx) ir_dereference_variable(var); 64 ir_assignment *assign = new(mem_ctx) ir_assignment(deref, ir->coordinate, 65 NULL); 66 base_ir->insert_before(assign); 67 68 deref = new(mem_ctx) ir_dereference_variable(var); 69 ir_rvalue *swiz0 = new(mem_ctx) ir_swizzle(deref, 0, 0, 0, 0, 1); 70 deref = new(mem_ctx) ir_dereference_variable(var); 71 ir_rvalue *swiz1 = new(mem_ctx) ir_swizzle(deref, 1, 0, 0, 0, 1); 72 deref = new(mem_ctx) ir_dereference_variable(var); 73 ir_rvalue *swiz2 = new(mem_ctx) ir_swizzle(deref, 2, 0, 0, 0, 1); 74 75 swiz0 = new(mem_ctx) ir_expression(ir_unop_abs, swiz0->type, swiz0, NULL); 76 swiz1 = new(mem_ctx) ir_expression(ir_unop_abs, swiz1->type, swiz1, NULL); 77 swiz2 = new(mem_ctx) ir_expression(ir_unop_abs, swiz2->type, swiz2, NULL); 78 79 ir_expression *expr; 80 expr = new(mem_ctx) ir_expression(ir_binop_max, 81 glsl_type::float_type, 82 swiz0, swiz1); 83 84 expr = new(mem_ctx) ir_expression(ir_binop_max, 85 glsl_type::float_type, 86 expr, swiz2); 87 88 expr = new(mem_ctx) ir_expression(ir_unop_rcp, 89 glsl_type::float_type, 90 expr, NULL); 91 92 /* coordinate.xyz *= expr */ 93 assign = new(mem_ctx) ir_assignment( 94 new(mem_ctx) ir_dereference_variable(var), 95 new(mem_ctx) ir_swizzle( 96 new(mem_ctx) ir_expression(ir_binop_mul, 97 ir->coordinate->type, 98 new(mem_ctx) ir_dereference_variable(var), 99 expr), 100 0, 1, 2, 0, 3)); 101 assign->write_mask = WRITEMASK_XYZ; 102 base_ir->insert_before(assign); 103 ir->coordinate = new(mem_ctx) ir_dereference_variable(var); 104 105 progress = true; 106 return visit_continue; 107 } 108 109 extern "C" { 110 111 bool 112 brw_do_cubemap_normalize(exec_list *instructions) 113 { 114 brw_cubemap_normalize_visitor v; 115 116 visit_list_elements(&v, instructions); 117 118 return v.progress; 119 } 120 121 } 122
