gpu: make register-write history opt-in in release builds

Keep error reporting and debug-build history. EDEN_NX2_3D_HISTORY enables the full ring in release builds without recording every method during normal play.

Assisted by Codex.

(cherry picked from commit cac6081916e8e5461e2754308cd8986deaec774b)

2 files changed, 14 insertions, 0 deletions

diff --git a/src/video_core/engines/maxwell_3d.cpp b/src/video_core/engines/maxwell_3d.cpp
index 70191ebef0..e00235d7a9 100644
--- a/src/video_core/engines/maxwell_3d.cpp
+++ b/src/video_core/engines/maxwell_3d.cpp
@@ -518,6 +518,10 @@ void Maxwell3D::DumpRecentWrites(u32 method) {
     }
     LOG_ERROR(HW_GPU, "Write to {:#x} while macro {:#x} collects parameters ({} so far); last writes:",
               method, executing_macro, macro_params.size());
+    if (!record_write_history) {
+        LOG_ERROR(HW_GPU, "Register write history disabled; EDEN_NX2_3D_HISTORY=1 enables it");
+        return;
+    }
     for (size_t i = 0; i < recent_writes.size(); ++i) {
         const auto& w = recent_writes[(recent_write_index + i) % recent_writes.size()];
         if (w.amount != 0) {
diff --git a/src/video_core/engines/maxwell_3d.h b/src/video_core/engines/maxwell_3d.h
index af0e37978e..7b38e176b6 100644
--- a/src/video_core/engines/maxwell_3d.h
+++ b/src/video_core/engines/maxwell_3d.h
@@ -3349,7 +3349,17 @@ private:
     };
     std::array<RecentWrite, 48> recent_writes{};
     size_t recent_write_index = 0;
+    const bool record_write_history{
+#ifdef NDEBUG
+        std::getenv("EDEN_NX2_3D_HISTORY") != nullptr
+#else
+        true
+#endif
+    };
     void RecordWrite(u32 method, u32 argument, u32 amount, u32 pending) {
+        if (!record_write_history) {
+            return;
+        }
         recent_writes[recent_write_index++ % recent_writes.size()] = {method, argument, amount, pending};
     }
     void DumpRecentWrites(u32 method);