NFSU2 Revived v0.15.22

What's Changed in v0.15.22

Enhanced Contrast Optimization & Bloom Bypass

• Pure Rust In-Game Contrast Regulator: Reworked the in-game Enhanced Contrast pipeline to evaluate directly inside native Rust (contrast_filter.rs). When Enhanced Contrast is enabled in the game options, redundant multi-pass overbright bloom shaders are bypassed, eliminating the severe GPU fillrate and bandwidth drop on mobile tile-based architectures:

  // In-game Enhanced Contrast regulator: suppresses redundant multi-pass overbright bloom
  #[no_mangle]
  pub extern "C" fn nfs_gfx_rust_filter_overbright(default_val: u32) -> u32 {
      if nfs_contrast_is_enabled() {
          0 // Bypass multi-pass bloom to eliminate GPU fillrate bottleneck
      } else {
          default_val
      }
  }

• Hardware Gamma Calibration: Replaced the performance-heavy software bleach-bypass blit with hardware gamma ramp adjustments via SetGammaRamp:

  // Hardware gamma curve replaces expensive software shader passes
  extern "C" void nfs_d3d9_set_enhanced_contrast_ramp(int enable) {
      if (!s_active_d3d9_device) return;
      D3DGAMMARAMP ramp;
      for (int i = 0; i < 256; ++i) {
          float normalized = (float)i / 255.0f;
          float adjusted = enable ? std::pow(normalized, 1.25f) : normalized;
          uint16_t val = (uint16_t)std::round(adjusted * 65535.0f);
          ramp.red[i] = ramp.green[i] = ramp.blue[i] = val;
      }
      s_active_d3d9_device->SetGammaRamp(0, D3DSGR_NO_CALIBRATION, &ramp);
  }

Rust Native Performance Engine Migration

• Game Performance Booster to Rust: Migrated core tuning and configuration routines from Java (GamePerformanceBooster.java) into pure native Rust modules (settings_engine.rs and driver_inspector.rs). Eliminates Java VM garbage collection pauses and JNI boundary latency during high-speed rendering:

  // Native Rust settings engine replaces JVM performance booster
  pub fn apply_performance_preset(&self, preset: PerformancePreset) {
      match preset {
          PerformancePreset::UltraPerformance => {
              self.dxvk_async.store(true, Ordering::Relaxed);
              self.draw_distance.store(350.0f32.to_bits(), Ordering::Relaxed);
              self.frame_limit.store(60, Ordering::Relaxed);
          }
      }
  }

Full Changelog: v0.15.21...v0.15.22