OpenEnroth_PreHistory/GammaControl.cpp at master · OpenEnroth/OpenEnroth_PreHistory · GitHub

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#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>

#define _CRT_SECURE_NO_WARNINGS
#include <string>

#include "GammaControl.h"
#include "Render.h"

#include "mm7_data.h"


//----- (0044F324) --------------------------------------------------------
void GammaController::GetRamp()
{
  if (pGammaControl)
    ErrD3D(pGammaControl->GetGammaRamp(0, &pDefaultRamp));
  else
    MessageBoxW(nullptr, L"Gamma control not active", L"E:\\WORK\\MSDEV\\MM7\\MM7\\Code\\GammaControl.cpp:83", 0);
}

//----- (0044F377) --------------------------------------------------------
double GammaController::_44F377(DDGAMMARAMP *a1)
{
  double v2; // st7@1
  unsigned __int16 *v3; // ecx@1
  double v4; // st6@2
  signed int v6; // [sp+0h] [bp-8h]@1
  signed int v7; // [sp+4h] [bp-4h]@1

  v2 = 0.0;
  v6 = 256;
  v3 = a1->green;
  for ( v7 = 0; v7 < 256; ++v7 )
  {
    v4 = ((double)*(v3 - 256) + (double)v3[256] + (double)*v3) * 0.000015259022 * 0.33333334;
    if ( v4 == 0.0 )
      --v6;
    else
      v2 = v2 + (double)v7 * 0.0039215689 / v4;
    ++v3;
  }
  if ( v6 )
    return v2 / (double)v6;
  else
    return 1.0;
}

//----- (0044F408) --------------------------------------------------------
void GammaController::SetGammaRamp(DDGAMMARAMP *pRamp)
{
  if (pGammaControl)
    ErrD3D(pGammaControl->SetGammaRamp(0, pRamp));
  else
    MessageBoxW(nullptr, L"Gamma control not active", L"E:\\WORK\\MSDEV\\MM7\\MM7\\Code\\GammaControl.cpp:120", 0);
}

//----- (0044F45B) --------------------------------------------------------
int GammaController::InitGammaRamp(DDGAMMARAMP *pRamp)
{
  unsigned __int16 *v2; // esi@1
  double v3; // st7@2
  signed __int64 v4; // qax@3
  signed int v6; // [sp+Ch] [bp-4h]@1

  v2 = pRamp->green;
  for ( v6 = 0; v6 < 256; ++v6 )
  {
    v3 = (double)v6 * 0.0039215689 * this->fGamma;
    if ( v3 >= 1.0 || (v4 = (signed __int64)(v3 * 65535.0), (signed int)v4 > 65535) )
      LODWORD(v4) = 65535;
    else if ( (signed int)v4 < 0 )
      LODWORD(v4) = 0;
	else
	{
    if ( (signed int)v4 > 65535 )
      LODWORD(v4) = 65535;
	}
    v2[256] = v4;
    *v2 = v4;
    *(v2 - 256) = v4;
    ++v2;
  }
  return v4;
}

//----- (0044F4D9) --------------------------------------------------------
void GammaController::Initialize(float gamma)
{
  double v3; // st7@3
  double v4; // st6@4

  //if (pVersion->pVersionInfo.dwPlatformId != VER_PLATFORM_WIN32_NT ||
      //pVersion->pVersionInfo.dwMajorVersion != 4)
  {
    InitializeFromSurface(pRenderer->pFrontBuffer4);
    v3 = 2.8;
    if ( gamma <= 2.8f )
      v4 = gamma;
    else
      v4 = 2.8;
    if ( v4 >= 0.1f )
    {
      if ( gamma <= 2.8f )
        v3 = gamma;
    }
    else
      v3 = 0.1;
    this->fGamma = v3;
    InitGammaRamp(&this->field_60C);
    SetGammaRamp(&this->field_60C);
  }
}

//----- (0044F215) --------------------------------------------------------
GammaController::GammaController()
{
  static float flt_4D8670_default_gamma = 1.0f;

  pGammaControl = nullptr;
  fGamma = flt_4D8670_default_gamma;
}

//----- (0044F24B) --------------------------------------------------------
void GammaController::InitializeFromSurface(IDirectDrawSurface4 *a2)
{
  this->pSurface = a2;
  if ( this->pGammaControl )
  {
    this->pGammaControl->Release();
    this->pGammaControl = 0;
  }
  if ( pRenderer->IsGammaSupported() )
  {
    ErrD3D(a2->QueryInterface(IID_IDirectDrawGammaControl, (LPVOID *)&this->pGammaControl));
    GetRamp();
    memcpy(&this->field_60C, &this->pDefaultRamp, 0x600u);
    fGamma = _44F377(&this->field_60C);
  }
}