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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2010-2012 VMware, Inc.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  17.  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  18.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20.  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21.  *
  22.  * The above copyright notice and this permission notice (including the
  23.  * next paragraph) shall be included in all copies or substantial portions
  24.  * of the Software.
  25.  *
  26.  **************************************************************************/
  27.  
  28.  
  29. #ifndef LP_BLD_LIMITS_H_
  30. #define LP_BLD_LIMITS_H_
  31.  
  32.  
  33. #include <limits.h>
  34.  
  35. #include "pipe/p_state.h"
  36. #include "pipe/p_defines.h"
  37.  
  38.  
  39. /*
  40.  * TGSI translation limits.
  41.  *
  42.  * Some are slightly above SM 3.0 requirements to give some wiggle room to
  43.  * the state trackers.
  44.  */
  45.  
  46. #define LP_MAX_TGSI_TEMPS 256
  47.  
  48. #define LP_MAX_TGSI_ADDRS 16
  49.  
  50. #define LP_MAX_TGSI_IMMEDIATES 256
  51.  
  52. #define LP_MAX_TGSI_PREDS 16
  53.  
  54. #define LP_MAX_TGSI_CONST_BUFFERS 16
  55.  
  56.  
  57. /**
  58.  * Maximum control flow nesting
  59.  *
  60.  * SM4.0 requires 64 (per subroutine actually, subroutine nesting itself is 32)
  61.  * SM3.0 requires 24 (most likely per subroutine too)
  62.  * add 2 more (some translation could add one more)
  63.  */
  64. #define LP_MAX_TGSI_NESTING 66
  65.  
  66. /**
  67.  * Maximum iterations before loop termination
  68.  * Shared between every loop in a TGSI shader
  69.  */
  70. #define LP_MAX_TGSI_LOOP_ITERATIONS 65535
  71.  
  72.  
  73. /**
  74.  * Some of these limits are actually infinite (i.e., only limited by available
  75.  * memory), however advertising INT_MAX would cause some test problems to
  76.  * actually try to allocate the maximum and run out of memory and crash.  So
  77.  * stick with something reasonable here.
  78.  */
  79. static INLINE int
  80. gallivm_get_shader_param(enum pipe_shader_cap param)
  81. {
  82.    switch(param) {
  83.    case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
  84.    case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
  85.    case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
  86.    case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
  87.       return 1 * 1024 * 1024;
  88.    case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
  89.       return LP_MAX_TGSI_NESTING;
  90.    case PIPE_SHADER_CAP_MAX_INPUTS:
  91.       return PIPE_MAX_SHADER_INPUTS;
  92.    case PIPE_SHADER_CAP_MAX_CONSTS:
  93.       return 16 * 2024;
  94.    case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
  95.       return PIPE_MAX_CONSTANT_BUFFERS;
  96.    case PIPE_SHADER_CAP_MAX_TEMPS:
  97.       return LP_MAX_TGSI_TEMPS;
  98.    case PIPE_SHADER_CAP_MAX_ADDRS:
  99.       return LP_MAX_TGSI_ADDRS;
  100.    case PIPE_SHADER_CAP_MAX_PREDS:
  101.       return LP_MAX_TGSI_PREDS;
  102.    case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
  103.       return 1;
  104.    case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
  105.    case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
  106.    case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
  107.    case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
  108.       return 1;
  109.    case PIPE_SHADER_CAP_SUBROUTINES:
  110.       return 1;
  111.    case PIPE_SHADER_CAP_INTEGERS:
  112.       return 1;
  113.    case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
  114.       return PIPE_MAX_SAMPLERS;
  115.    case PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED:
  116.       return 1;
  117.    default:
  118.       return 0;
  119.    }
  120. }
  121.  
  122.  
  123. #endif /* LP_BLD_LIMITS_H_ */
  124.