Add alwaysRecalculateTextureHashes option for games that dynamically update textures

This option can help in games that dynamically update existing textures.
Remix normally does not update the hash after texture creation which can lead to issues with texture replacements or texture tagging.

Author: xoxor4d

src/d3d9/d3d9_common_texture.cpp

@@ -658,9 +658,13 @@ namespace dxvk {
     if (m_type != D3DRTYPE_TEXTURE || (m_desc.Usage & D3DUSAGE_DEPTHSTENCIL))
       return;
 
+    const bool alwaysRecalculateHash = RtxOptions::alwaysRecalculateTextureHashes();
+
     if (m_image->getHash() != 0) {
-      // Already setup.
-      return;
+      if (!alwaysRecalculateHash) {
+        // Already setup.
+        return;
+      }
     }
 
     // Use subresource 0 for hashing
@@ -682,6 +686,14 @@ namespace dxvk {
     } else {
       imageHash = XXH3_64bits(buffer->mapPtr(0), buffer->info().size);
     }
+
+    if (alwaysRecalculateHash) {
+      // Release old texture if hash changed
+      if (m_image->getHash() != imageHash) {
+        ImGUI::ReleaseTexture(m_image->getHash());
+      }
+    }
+
     // save hash to dxvkImage
     m_image->setHash(imageHash);
 

src/dxvk/imgui/dxvk_imgui.cpp

@@ -2595,7 +2595,8 @@ namespace dxvk {
 
     if (IMGUI_ADD_TOOLTIP(ImGui::BeginTabItem("Step 1: Categorize Textures", nullptr, tab_item_flags), "Select texture definitions for Remix")) {
       spacing();
-      ImGui::Checkbox("Preserve discarded textures", &RtxOptions::keepTexturesForTaggingObject());
+      ImGui::Checkbox("Preserve Discarded Textures", &RtxOptions::keepTexturesForTaggingObject());
+      ImGui::Checkbox("Always Recalculate Hashes", &RtxOptions::alwaysRecalculateTextureHashesObject());
       separator();
 
       // set thumbnail size

src/dxvk/rtx_render/rtx_options.h

@@ -1106,6 +1106,11 @@ namespace dxvk {
                "Whether or not to use slower XXH64 hash on texture upload.\n"
                "New projects should not enable this option as this solely exists for compatibility with older hashing schemes.");
 
+    RTX_OPTION("rtx", bool, alwaysRecalculateTextureHashes, false,
+               "Use this option to recalculate the hash of a texture every time it is used, as streaming systems might override textures with other textures when they are no longer in use.\n"
+               "This might result in the wrong textures being used on meshes, as Remix normally does not recalculate texture hashes for performance reasons.\n"
+               "You may need to restart to see the full effect.");
+
     RTX_OPTION("rtx", bool, serializeChangedOptionOnly, true, "");
 
     RTX_OPTION("rtx", uint32_t, applicationId, 102100511, "Used to uniquely identify the application to DLSS. Generally should not be changed without good reason.");