From 5d134b877a87c3b5e7f06300ee6724d0f53287cf Mon Sep 17 00:00:00 2001
From: Lilium <19245343+EndlesslyFlowering@users.noreply.github.com>
Date: Sat, 20 May 2023 13:47:10 +0200
Subject: [PATCH] [d3d9] implement 'samplerLodBias' as a conf option

---
 dxvk.conf                 | 2 +-
 src/d3d9/d3d9_device.cpp  | 2 +-
 src/d3d9/d3d9_options.cpp | 6 ++++++
 src/d3d9/d3d9_options.h   | 5 +++++
 4 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/dxvk.conf b/dxvk.conf
index b46e4b8b..bde5a7e4 100644
--- a/dxvk.conf
+++ b/dxvk.conf
@@ -189,7 +189,7 @@
 # Supported values: Any number between -2.0 and 1.0
 
 # d3d11.samplerLodBias = 0.0
-
+# d3d9.samplerLodBias = 0.0
 
 # Declares vertex positions as invariant in order to solve
 # potential Z-fighting issues at a small performance cost.
diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index 7edb25fd..1dd5bbd7 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -6243,7 +6243,7 @@ namespace dxvk {
       info.mipmapMode     = mipFilter.MipFilter;
       info.maxAnisotropy  = float(cKey.MaxAnisotropy);
       info.useAnisotropy  = cKey.MaxAnisotropy > 1;
-      info.mipmapLodBias  = cKey.MipmapLodBias;
+      info.mipmapLodBias  = cKey.MipmapLodBias + m_d3d9Options.samplerLodBias;
       info.mipmapLodMin   = mipFilter.MipsEnabled ? float(cKey.MaxMipLevel) : 0;
       info.mipmapLodMax   = mipFilter.MipsEnabled ? FLT_MAX                 : 0;
       info.reductionMode  = VK_SAMPLER_REDUCTION_MODE_WEIGHTED_AVERAGE;
diff --git a/src/d3d9/d3d9_options.cpp b/src/d3d9/d3d9_options.cpp
index 4518094f..61a817b8 100644
--- a/src/d3d9/d3d9_options.cpp
+++ b/src/d3d9/d3d9_options.cpp
@@ -1,3 +1,5 @@
+#include "../util/util_math.h"
+
 #include "d3d9_options.h"
 
 #include "d3d9_caps.h"
@@ -72,6 +74,10 @@ namespace dxvk {
     this->seamlessCubes                 = config.getOption<bool>        ("d3d9.seamlessCubes",                 false);
     this->textureMemory                 = config.getOption<int32_t>     ("d3d9.textureMemory",                 100) << 20;
     this->deviceLossOnFocusLoss         = config.getOption<bool>        ("d3d9.deviceLossOnFocusLoss",         false);
+    this->samplerLodBias                = config.getOption<float>       ("d3d9.samplerLodBias",                0.0f);
+
+    // Clamp LOD bias so that people don't abuse this in unintended ways
+    this->samplerLodBias = dxvk::fclamp(this->samplerLodBias, -2.0f, 1.0f);
 
     std::string floatEmulation = Config::toLower(config.getOption<std::string>("d3d9.floatEmulation", "auto"));
     if (floatEmulation == "strict") {
diff --git a/src/d3d9/d3d9_options.h b/src/d3d9/d3d9_options.h
index 89e46b81..3984d0b1 100644
--- a/src/d3d9/d3d9_options.h
+++ b/src/d3d9/d3d9_options.h
@@ -136,6 +136,11 @@ namespace dxvk {
     /// Don't use non seamless cube maps
     bool seamlessCubes;
 
+    /// Mipmap LOD bias
+    ///
+    /// Enforces the given LOD bias for all samplers.
+    float samplerLodBias;
+
     /// How much virtual memory will be used for textures (in MB).
     int32_t textureMemory;