src/mesa/drivers/dri/i965/brw_lower_unnormalized_offset.cpp

   1 /*
   2  * Copyright © 2013 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_lower_unnormalized_offset.cpp
  26  *
  27  * IR lower pass to convert a texture offset into an adjusted coordinate,
  28  * for use with unnormalized coordinates. At least the gather4* messages
  29  * on Ivybridge and Haswell make a mess with nonzero offsets.
  30  *
  31  * \author Chris Forbes <chrisf@ijw.co.nz>
  32  */
  33
  34 #include "glsl/glsl_types.h"
  35 #include "glsl/ir.h"
  36 #include "glsl/ir_builder.h"
  37
  38 using namespace ir_builder;
  39
  40 class brw_lower_unnormalized_offset_visitor : public ir_hierarchical_visitor {
  41 public:
  42    brw_lower_unnormalized_offset_visitor()
  43    {
  44       progress = false;
  45    }
  46
  47    ir_visitor_status visit_leave(ir_texture *ir);
  48
  49    bool progress;
  50 };
  51
  52 ir_visitor_status
  53 brw_lower_unnormalized_offset_visitor::visit_leave(ir_texture *ir)
  54 {
  55    if (!ir->offset)
  56       return visit_continue;
  57
  58    if (ir->op == ir_tg4 || ir->op == ir_tex) {
  59       if (ir->sampler->type->sampler_dimensionality != GLSL_SAMPLER_DIM_RECT)
  60          return visit_continue;
  61    }
  62    else if (ir->op != ir_txf) {
  63       return visit_continue;
  64    }
  65
  66    void *mem_ctx = ralloc_parent(ir);
  67
  68    if (ir->op == ir_txf) {
  69       ir_variable *var = new(mem_ctx) ir_variable(ir->coordinate->type,
  70                                                   "coordinate",
  71                                                   ir_var_temporary);
  72       base_ir->insert_before(var);
  73       base_ir->insert_before(assign(var, ir->coordinate));
  74       base_ir->insert_before(assign(var,
  75                add(swizzle_for_size(var, ir->offset->type->vector_elements), ir->offset),
  76                (1 << ir->offset->type->vector_elements) - 1));
  77
  78       ir->coordinate = new(mem_ctx) ir_dereference_variable(var);
  79    } else {
  80       ir->coordinate = add(ir->coordinate, i2f(ir->offset));
  81    }
  82
  83    ir->offset = NULL;
  84
  85    progress = true;
  86    return visit_continue;
  87 }
  88
  89 extern "C" {
  90
  91 bool
  92 brw_do_lower_unnormalized_offset(exec_list *instructions)
  93 {
  94    brw_lower_unnormalized_offset_visitor v;
  95
  96    visit_list_elements(&v, instructions);
  97
  98    return v.progress;
  99 }
 100
 101 }