patch: mock return for textures not found by Track method (#150)

as discussed in #dev-chat, the goal is to feed untracked bindless textures requests with last valid bindless textures for now, so that most games keep running despite possible visual artifacts. as Track evolves, this mock shall be dropped eventually.

Co-authored-by: Allison Cunha <allisonbzk@gmail.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/150
Co-authored-by: xbzk <xbzk@noreply.localhost>
Co-committed-by: xbzk <xbzk@noreply.localhost>

src/shader_recompiler/ir_opt/texture_pass.cpp

@@ -327,14 +327,31 @@ std::optional<ConstBufferAddr> TryGetConstBuffer(const IR::Inst* inst, Environme
     };
 }
 
+// TODO:xbzk: shall be dropped when Track method cover all bindless stuff
+static ConstBufferAddr last_valid_addr = ConstBufferAddr{
+    .index = 0,
+    .offset = 0,
+    .shift_left = 0,
+    .secondary_index = 0,
+    .secondary_offset = 0,
+    .secondary_shift_left = 0,
+    .dynamic_offset = {},
+    .count = 1,
+    .has_secondary = false,
+};
+
 TextureInst MakeInst(Environment& env, IR::Block* block, IR::Inst& inst) {
     ConstBufferAddr addr;
     if (IsBindless(inst)) {
         const std::optional<ConstBufferAddr> track_addr{Track(inst.Arg(0), env)};
+
         if (!track_addr) {
-            throw NotImplementedException("Failed to track bindless texture constant buffer");
+            //throw NotImplementedException("Failed to track bindless texture constant buffer");
+            addr = last_valid_addr; // TODO:xbzk: shall be dropped when Track method cover all bindless stuff
+        } else {
+            addr = *track_addr;
+            last_valid_addr = addr; // TODO:xbzk: shall be dropped when Track method cover all bindless stuff
         }
-        addr = *track_addr;
     } else {
         addr = ConstBufferAddr{
             .index = env.TextureBoundBuffer(),