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  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@anholt.net>
  31.  */
  32.  
  33. #include "glsl/glsl_types.h"
  34. #include "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->op == ir_txs)
  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.