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      1 /*
      2  * Copyright  2012 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 DEALINGS
     21  * IN THE SOFTWARE.
     22  */
     23 
     24 #include "ir.h"
     25 
     26 namespace ir_builder {
     27 
     28 /**
     29  * This little class exists to let the helper expression generators
     30  * take either an ir_rvalue * or an ir_variable * to be automatically
     31  * dereferenced, while still providing compile-time type checking.
     32  *
     33  * You don't have to explicitly call the constructor -- C++ will see
     34  * that you passed an ir_variable, and silently call the
     35  * operand(ir_variable *var) constructor behind your back.
     36  */
     37 class operand {
     38 public:
     39    operand(ir_rvalue *val)
     40       : val(val)
     41    {
     42    }
     43 
     44    operand(ir_variable *var)
     45    {
     46       void *mem_ctx = ralloc_parent(var);
     47       val = new(mem_ctx) ir_dereference_variable(var);
     48    }
     49 
     50    ir_rvalue *val;
     51 };
     52 
     53 /** Automatic generator for ir_dereference_variable on assignment LHS.
     54  *
     55  * \sa operand
     56  */
     57 class deref {
     58 public:
     59    deref(ir_dereference *val)
     60       : val(val)
     61    {
     62    }
     63 
     64    deref(ir_variable *var)
     65    {
     66       void *mem_ctx = ralloc_parent(var);
     67       val = new(mem_ctx) ir_dereference_variable(var);
     68    }
     69 
     70 
     71    ir_dereference *val;
     72 };
     73 
     74 class ir_factory {
     75 public:
     76    void emit(ir_instruction *ir);
     77    ir_variable *make_temp(const glsl_type *type, const char *name);
     78 
     79    exec_list *instructions;
     80    void *mem_ctx;
     81 };
     82 
     83 ir_assignment *assign(deref lhs, operand rhs);
     84 ir_assignment *assign(deref lhs, operand rhs, int writemask);
     85 
     86 ir_expression *expr(ir_expression_operation op, operand a);
     87 ir_expression *expr(ir_expression_operation op, operand a, operand b);
     88 ir_expression *add(operand a, operand b);
     89 ir_expression *sub(operand a, operand b);
     90 ir_expression *mul(operand a, operand b);
     91 ir_expression *dot(operand a, operand b);
     92 ir_expression *saturate(operand a);
     93 
     94 /**
     95  * Swizzle away later components, but preserve the ordering.
     96  */
     97 ir_swizzle *swizzle_for_size(operand a, int components);
     98 
     99 ir_swizzle *swizzle_xxxx(operand a);
    100 ir_swizzle *swizzle_yyyy(operand a);
    101 ir_swizzle *swizzle_zzzz(operand a);
    102 ir_swizzle *swizzle_wwww(operand a);
    103 ir_swizzle *swizzle_x(operand a);
    104 ir_swizzle *swizzle_y(operand a);
    105 ir_swizzle *swizzle_z(operand a);
    106 ir_swizzle *swizzle_w(operand a);
    107 ir_swizzle *swizzle_xy(operand a);
    108 ir_swizzle *swizzle_xyz(operand a);
    109 ir_swizzle *swizzle_xyzw(operand a);
    110 
    111 } /* namespace ir_builder */
    112