[d3d9,d3d11] Remove numBackBuffers option

Useless.

dxvk.conf

@@ -140,15 +140,6 @@
 # dxgi.maxSharedMemory = 0
 
 
-# Override back buffer count for the Vulkan swap chain.
-# Setting this to 0 or less will have no effect.
-#
-# Supported values: Any number greater than or equal to 2.
-
-# dxgi.numBackBuffers = 0
-# d3d9.numBackBuffers = 0
-
-
 # Overrides synchronization interval (Vsync) for presentation.
 # Setting this to 0 disables vertical synchronization entirely.
 # A positive value 'n' will enable Vsync and repeat the same
@@ -160,10 +151,10 @@
 # d3d9.presentInterval = -1
 
 
+# Controls tearing behaviour with regards to in-game Vsync settings.
+#
 # True enables the mailbox present mode in case regular Vsync is disabled.
-# This should avoid tearing, but may be unsupported on some systems
-# or require setting dxgi.numBackBuffers to a higher value in order
-# to work properly. 
+# This eliminates tearing, but may be unsupported on some systems.
 #
 # False enables the relaxed fifo present mode in case regular Vsync is enabled.
 # This should result in tearing but reduce stutter if FPS are too low,

src/d3d11/d3d11_options.cpp

@@ -28,7 +28,6 @@ namespace dxvk {
     this->disableMsaa           = config.getOption<bool>("d3d11.disableMsaa", false);
     this->enableContextLock     = config.getOption<bool>("d3d11.enableContextLock", false);
     this->deferSurfaceCreation  = config.getOption<bool>("dxgi.deferSurfaceCreation", false);
-    this->numBackBuffers        = config.getOption<int32_t>("dxgi.numBackBuffers", 0);
     this->maxFrameLatency       = config.getOption<int32_t>("dxgi.maxFrameLatency", 0);
     this->exposeDriverCommandLists = config.getOption<bool>("d3d11.exposeDriverCommandLists", true);
     this->reproducibleCommandStream = config.getOption<bool>("d3d11.reproducibleCommandStream", false);

src/d3d11/d3d11_options.h

@@ -72,10 +72,6 @@ namespace dxvk {
     /// Enable float control bits
     bool floatControls = true;
 
-    /// Back buffer count for the Vulkan swap chain.
-    /// Overrides DXGI_SWAP_CHAIN_DESC::BufferCount.
-    int32_t numBackBuffers = 0;
-
     /// Override maximum frame latency if the app specifies
     /// a higher value. May help with frame timing issues.
     int32_t maxFrameLatency = 0;

src/d3d9/d3d9_options.cpp

@@ -49,7 +49,6 @@ namespace dxvk {
     this->strictConstantCopies          = config.getOption<bool>        ("d3d9.strictConstantCopies",          false);
     this->strictPow                     = config.getOption<bool>        ("d3d9.strictPow",                     true);
     this->lenientClear                  = config.getOption<bool>        ("d3d9.lenientClear",                  false);
-    this->numBackBuffers                = config.getOption<int32_t>     ("d3d9.numBackBuffers",                0);
     this->deferSurfaceCreation          = config.getOption<bool>        ("d3d9.deferSurfaceCreation",          false);
     this->samplerAnisotropy             = config.getOption<int32_t>     ("d3d9.samplerAnisotropy",             -1);
     this->maxAvailableMemory            = config.getOption<int32_t>     ("d3d9.maxAvailableMemory",            4096);

src/d3d9/d3d9_options.h

@@ -50,10 +50,6 @@ namespace dxvk {
     /// Whether or not to do a fast path clear if we're close enough to the whole render target.
     bool lenientClear;
 
-    /// Back buffer count for the Vulkan swap chain.
-    /// Overrides buffer count in present parameters.
-    int32_t numBackBuffers;
-
     /// Defer surface creation
     bool deferSurfaceCreation;