claudes_game/docs/session_summaries/2025-02-06-ui-buffer-caching-optimization.md

2025-02-06-ui-buffer-caching-optimization

Changes Made

Commit 1: 79a972a - Fix GuiDropdownBox behavior with static edit mode variables

• Fixed 7 dropdown controls that were incorrectly sharing edit mode variables
• Each dropdown now has its own static editMode variable
• Affected controls: orbit type, body/craft selection, burn direction, trigger type
• Updated maneuver dialog progress documentation

Commit 2: b37497a - Implement UIState buffer caching to eliminate per-frame malloc/free calls

• Implemented comprehensive buffer caching system in UIState
• Cached 4 buffer types:
  • Body names list (for object selection dropdown)
  • Spacecraft names list (for object selection dropdown)
  • Maneuver names list (for maneuver info display)
  • Maneuver status strings list
• Added needs_update flags for each cached buffer
• Added last_counts to track when buffers need invalidation
• Eliminated all per-frame malloc/free calls in ui_render_info_panel_objects()
• Eliminated all per-frame malloc/free calls in ui_render_info_panel_selected()
• Integrated cache invalidation into main loop and maneuver execution

Commit 3: 028b8a8 - Fix UI buffer caching: remove dead code, use count-based invalidation, fix update bug

• Removed dead code from simulation.cpp/h (52 lines removed, 16 lines from header)
• Simplified invalidation logic: removed buffer_valid flag in favor of count-based checks
• Fixed bug where maneuver status cache was not being updated after maneuver execution
• Separated concerns: ui_renderer handles UI cache, simulation module no longer has UI code

Commit 4: c76380f - Fix UI: maneuver status updates, ZII initialization, helper functions for cache checks

• Fixed maneuver status update bug: status strings now properly update after execution
• Fixed ZII initialization in ui_render_info_panel_selected: all state variables now use = {0}
• Added helper functions:
  • check_needs_update_simcount() - checks if cache needs update based on body count
  • check_needs_update_craftcount() - checks if cache needs update based on craft count
  • check_needs_update_maneuvercount() - checks if cache needs update based on maneuver count
• Refactored buffer update logic to use helper functions for clarity
• Updated AGENTS.md with command reference for testing

Results

Net line count changes:

• Insertions: 322
• Deletions: 179
• Net: +143 lines

Functionality Implemented

Buffer Caching System

• Dynamic array allocation only when counts change
• Automatic cache invalidation based on body/craft/maneuver counts
• Helper functions for count-based cache invalidation checks
• Integration points:
  • main_loop() - invalidates caches before rendering
  • execute_maneuver() - invalidates maneuver cache after execution

UI Improvements

• Fixed all dropdown controls with static edit mode variables
• Proper separation of concerns between UI and simulation modules
• Cleaner, more maintainable cache update logic

Code Quality

• ZII (Zero Is Initialization) pattern applied to UIState
• Removed 52 lines of dead code from simulation module
• Better code organization with helper functions