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Fix dark rectangles around text (VGUI2 Blur bug) in steam_legacy #300

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Fix dark rectangles around text (VGUI2 Blur bug) in steam_legacy #300

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55 changes: 55 additions & 0 deletions src/game/client/engine_patches_windows.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,11 @@ class CEnginePatchesWindows : public CEnginePatches
double *m_pflFrameTime = nullptr;
double m_flFrameTimeReminder = 0;

// Blur Bug
uintptr_t m_iBlurBugPlace = 0;
uint8_t m_BlurBugPlaceBackup[10] = { 0 };
void PatchBlurBug(bool enable);

// Connectionless Packet
using ConnectionlessPacketFunc = void (*)();
ConnectionlessPacketFunc m_fnEngineCLPHandler = nullptr;
Expand Down Expand Up @@ -235,13 +240,15 @@ void CEnginePatchesWindows::PlatformPatchesInit()

PatchFPSBug(true);
PatchConnectionlessPacketHandler(true);
PatchBlurBug(true);
SetAffinity();
}

void CEnginePatchesWindows::PlatformPatchesShutdown()
{
PatchFPSBug(false);
PatchConnectionlessPacketHandler(false);
PatchBlurBug(false);
PatchCommandList(false);
RemoveSvcHooks();
}
Expand Down Expand Up @@ -598,6 +605,54 @@ void CEnginePatchesWindows::ConnectionlessPacketHandler()
s_EnginePatchesInstance.m_fnEngineCLPHandler();
}

void CEnginePatchesWindows::PatchBlurBug(bool enable)
{
if (gHUD.GetEngineBuild() >= ENGINE_BUILD_ANNIVERSARY_FIRST)
return;

if (enable)
{
if (m_iBlurBugPlace)
return;

const char data1[] = "8843028B4510C64303FF";
const char mask1[] = "FFFFFFFFFFFFFFFFFFFF";
uintptr_t addr1 = MemoryFindForward(m_EngineModule.iBase, m_EngineModule.iEnd, data1, mask1);

if (addr1)
{
m_iBlurBugPlace = addr1;

memcpy(m_BlurBugPlaceBackup, (void*)m_iBlurBugPlace, 10);

const char data2[] = "6AFF8F038843038B4510";
unsigned char newBytes[10];
ConvertHexString(data2, newBytes, sizeof(newBytes));

DWORD oldProtect;
VirtualProtect((void*)m_iBlurBugPlace, 10, PAGE_EXECUTE_READWRITE, &oldProtect);
memcpy((void*)m_iBlurBugPlace, newBytes, 10);
VirtualProtect((void*)m_iBlurBugPlace, 10, oldProtect, &oldProtect);
}
else
{
ConPrintf(ConColor::Red, "Engine patch: offset of Blur Bug not found.\n");
}
}
else
{
if (!m_iBlurBugPlace)
return;

DWORD oldProtect;
VirtualProtect((void*)m_iBlurBugPlace, 10, PAGE_EXECUTE_READWRITE, &oldProtect);
memcpy((void*)m_iBlurBugPlace, m_BlurBugPlaceBackup, 10);
VirtualProtect((void*)m_iBlurBugPlace, 10, oldProtect, &oldProtect);

m_iBlurBugPlace = 0;
}
}

void CEnginePatchesWindows::PatchCommandList(bool enable)
{
cmd_function_t *pFirst = gEngfuncs.GetFirstCmdFunctionHandle();
Expand Down