[d3d9] Don't use memory tracking to determine resource creation failu…

…re by default

This allows us to use more than 4GB of VRAM in games.

This behaviour changed in the Fall Creators update (https://www.neowin.net/news/windows-10-fall-creators-update-fixes-the-directx-9-memory-allocation-bug)
But lets keep it around in case some game depend on the old behaviour! (It's D3D9 after all...)

May impact #93, #170, #383 and #438

src/d3d9/d3d9_device.cpp

@@ -140,8 +140,10 @@ namespace dxvk {
     // Clamp to megabyte range, as per spec.
     constexpr UINT range = 0xfff00000;
 
-    UINT memory = UINT(m_availableMemory.load());
-    return memory & range;
+    // Can't have negative memory!
+    int64_t memory = std::max(m_availableMemory.load(), 0ll);
+
+    return UINT(memory) & range;
   }
 
 

src/d3d9/d3d9_device.h

@@ -835,7 +835,7 @@ namespace dxvk {
     bool ChangeReportedMemory(int64_t delta) {
       m_availableMemory += delta;
 
-      return m_availableMemory > 0;
+      return !m_d3d9Options.memoryTrackTest || m_availableMemory > 0;
     }
 
     void ResolveZ();

src/d3d9/d3d9_options.cpp

@@ -54,6 +54,7 @@ namespace dxvk {
     this->swvpBoolCount         = config.getOption<uint32_t>("d3d9.swvpBoolCount",         caps::MaxOtherConstantsSoftware);
     this->disableA8RT           = config.getOption<bool>    ("d3d9.disableA8RT",           false);
     this->invariantPosition     = config.getOption<bool>    ("d3d9.invariantPosition",     false);
+    this->memoryTrackTest       = config.getOption<bool>    ("d3d9.memoryTrackTest",       false);
 
     // If we are not Nvidia, enable general hazards.
     this->generalHazards = adapter == nullptr || !adapter->matchesDriver(DxvkGpuVendor::Nvidia, VK_DRIVER_ID_NVIDIA_PROPRIETARY_KHR, 0, 0);

src/d3d9/d3d9_options.h

@@ -93,6 +93,10 @@ namespace dxvk {
     /// Work around a NV driver quirk
     /// Fixes flickering/z-fighting in some games.
     bool invariantPosition;
+
+    /// Whether or not to respect memory tracking for
+    /// failing resource allocation.
+    bool memoryTrackTest;
   };
 
 }