Add DPF_VST3_DONT_USE_BRAND_ID to fix compat with existing plugins

Signed-off-by: falkTX <[email protected]>

distrho/DistrhoInfo.hpp

@@ -677,7 +677,9 @@ START_NAMESPACE_DISTRHO
 /**
    A 4-character symbol that identifies a brand or manufacturer, with at least one non-lower case character.@n
    Plugins from the same brand should use the same symbol.
-   @note This macro is required when building AU plugins
+   @note This macro is required when building AU plugins, and used for VST3 if present
+   @note Setting this macro will change the uid of a VST3 plugin.
+         If you already released a DPF-based VST3 plugin make sure to also enable DISTRHO_PLUGIN_VST3_OLD_ID_COMPAT
  */
 #define DISTRHO_PLUGIN_BRAND_ID Dstr
 
@@ -877,6 +879,12 @@ START_NAMESPACE_DISTRHO
  */
 #define DPF_VST_SHOW_PARAMETER_OUTPUTS
 
+/**
+   Forcibly ignore DISTRHO_PLUGIN_BRAND_ID for VST3 plugins.@n
+   This is required for DPF-based VST3 plugins that got released without setting DISTRHO_PLUGIN_BRAND_ID first.
+ */
+#define DPF_VST3_DONT_USE_BRAND_ID
+
 /**
    Disable all file browser related code.@n
    Must be set as compiler macro when building DGL. (e.g. `CXXFLAGS="-DDGL_FILE_BROWSER_DISABLED"`)

distrho/src/DistrhoPluginVST3.cpp

@@ -92,7 +92,7 @@ static constexpr const uint32_t dpf_id_view  = d_cconst('v', 'i', 'e', 'w');
 // --------------------------------------------------------------------------------------------------------------------
 // plugin specific uids (values are filled in during plugin init)
 
-#ifdef DISTRHO_PLUGIN_BRAND_ID
+#if defined(DISTRHO_PLUGIN_BRAND_ID) && !defined(DPF_VST3_DONT_USE_BRAND_ID)
 static constexpr const uint32_t dpf_id_brand = d_cconst(STRINGIFY(DISTRHO_PLUGIN_BRAND_ID));
 #else
 static constexpr const uint32_t dpf_id_brand = 0;