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     if (sscanf(pOverride, "%u", &value))
  42     {
  43         knobValue = static_cast<T>(value);
  44     }
  45 }
  46
  47 static inline void ConvertEnvToKnob(const char* pOverride, bool& knobValue)
  48 {
  49     size_t len = strlen(pOverride);
  50     if (len == 1)
  51     {
  52         auto c = tolower(pOverride[0]);
  53         if (c == 'y' || c == 't' || c == '1')
  54         {
  55             knobValue = true;
  56             return;
  57         }
  58         if (c == 'n' || c == 'f' || c == '0')
  59         {
  60             knobValue = false;
  61             return;
  62         }
  63     }
  64
  65     // Try converting to a number and casting to bool
  66     uint32_t value = 0;
  67     if (sscanf(pOverride, "%u", &value))
  68     {
  69         knobValue = value != 0;
  70         return;
  71     }
  72 }
  73
  74 static inline void ConvertEnvToKnob(const char* pOverride, float& knobValue)
  75 {
  76     float value = knobValue;
  77     if (sscanf(pOverride, "%f", &value))
  78     {
  79         knobValue = value;
  80     }
  81 }
  82
  83 static inline void ConvertEnvToKnob(const char* pOverride, std::string& knobValue)
  84 {
  85     knobValue = pOverride;
  86 }
  87
  88 template <typename T>
  89 static inline void InitKnob(T& knob)
  90 {
  91
  92     // TODO, read registry first
  93
  94     // Second, read environment variables
  95     const char* pOverride = getenv(knob.Name());
  96
  97     if (pOverride)
  98     {
  99         auto knobValue = knob.Value();
 100         ConvertEnvToKnob(pOverride, knobValue);
 101         knob.Value(knobValue);
 102     }
 103 }