src/gallium/drivers/swr/rasterizer/core/knobs_init.h

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  23 * @file knobs_init.h
  24 *
  25 * @brief Dynamic Knobs Initialization for Core.
  26 *
  27 ******************************************************************************/
  28 #pragma once
  29
  30 #include <core/knobs.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <ctype.h>
  34 #include <stdio.h>
  35
  36 // Assume the type is compatible with a 32-bit integer
  37 template <typename T>
  38 static inline void ConvertEnvToKnob(const char* pOverride, T& knobValue)
  39 {
  40     uint32_t value = 0;
  41     char* pStopped = nullptr;
  42     value = strtoul(pOverride, &pStopped, 0);
  43     if (pStopped != pOverride)
  44     {
  45         knobValue = static_cast<T>(value);
  46     }
  47 }
  48
  49 static inline void ConvertEnvToKnob(const char* pOverride, bool& knobValue)
  50 {
  51     size_t len = strlen(pOverride);
  52     if (len == 1)
  53     {
  54         auto c = tolower(pOverride[0]);
  55         if (c == 'y' || c == 't' || c == '1')
  56         {
  57             knobValue = true;
  58             return;
  59         }
  60         if (c == 'n' || c == 'f' || c == '0')
  61         {
  62             knobValue = false;
  63             return;
  64         }
  65     }
  66
  67     // Try converting to a number and casting to bool
  68     uint32_t value = 0;
  69     char* pStopped = nullptr;
  70     value = strtoul(pOverride, &pStopped, 0);
  71     if (pStopped != pOverride)
  72     {
  73         knobValue = value != 0;
  74     }
  75 }
  76
  77 static inline void ConvertEnvToKnob(const char* pOverride, float& knobValue)
  78 {
  79     float value = knobValue;
  80     if (sscanf(pOverride, "%f", &value))
  81     {
  82         knobValue = value;
  83     }
  84 }
  85
  86 static inline void ConvertEnvToKnob(const char* pOverride, std::string& knobValue)
  87 {
  88     knobValue = pOverride;
  89 }
  90
  91 template <typename T>
  92 static inline void InitKnob(T& knob)
  93 {
  94     // Read environment variables
  95     const char* pOverride = getenv(knob.Name());
  96
  97     if (pOverride)
  98     {
  99         auto knobValue = knob.DefaultValue();
 100         ConvertEnvToKnob(pOverride, knobValue);
 101         knob.Value(knobValue);
 102     }
 103     else
 104     {
 105         // Set default value
 106         knob.Value(knob.DefaultValue());
 107     }
 108 }