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John Cooper McDonald

PROFILE

John Cooper Mcdonald

Mario Pikmin Zelda contributed to the rh-hideout/pokeemerald-expansion and TeamREPENTOGON/REPENTOGON repositories, focusing on gameplay features, asset integration, and build stability. Over 13 months, Mario delivered enhancements such as improved battle messaging, expanded sprite and palette support, and refined item visuals, using C, C++, and Lua scripting. He addressed bugs in rendering and memory management, implemented localization, and streamlined configuration for modding APIs. His technical approach emphasized maintainable code, robust debugging, and data-driven design, resulting in more reliable builds and a smoother player experience. The work demonstrated depth in graphics programming, asset pipelines, and cross-team collaboration for game development.

Overall Statistics

Feature vs Bugs

66%Features

Repository Contributions

52Total
Bugs
12
Commits
52
Features
23
Lines of code
9,601
Activity Months13

Work History

March 2026

1 Commits • 1 Features

Mar 1, 2026

March 2026 monthly summary for rh-hideout/pokeemerald-expansion: Delivered the Strange Ball sprite color palette enhancement to improve visual fidelity and consistency with the game's art direction. Commit: 57f23799fa606bb51f8eebd8166fedf94640156f (#9556). No major bugs fixed this month. Overall impact: enhanced player immersion through stronger asset fidelity and consistency across sprites. Technologies and skills demonstrated: sprite color palette iteration, asset integration, Git/version control, collaboration with art and gameplay teams.

February 2026

1 Commits • 1 Features

Feb 1, 2026

February 2026 monthly summary for rh-hideout/pokeemerald-expansion focused on delivering high-quality asset visuals and maintaining asset pipeline integrity. The key delivery was the Enhanced item visuals: Z-A Mega Stones sprites, including new sprite graphics and palettes, with integration into graphics header and item data to ensure correct in-game rendering and data consistency.

January 2026

3 Commits • 2 Features

Jan 1, 2026

January 2026 monthly summary for rh-hideout/pokeemerald-expansion. Delivered key features improving visuals and box-management UX, with targeted bug fixes that enhance robustness of the sprite renderer and config handling. The work strengthens visual fidelity, user experience, and asset pipelines, contributing to higher player engagement and maintainability.

December 2025

3 Commits

Dec 1, 2025

December 2025 — rh-hideout/pokeemerald-expansion: Focused on visual fidelity and build stability. Delivered precise visual rendering fixes to ensure asymmetrical follower sprites render correctly and shadows for Naclstack and Garganacl are accurately represented. Also ensured build compatibility when the OW_POKEMON_OBJECT_EVENTS feature is disabled by commenting out affected visuals and overworld data, allowing clean compilation without these elements. These changes reduce visual regressions, support feature-flag experimentation, and improve overall release reliability.

September 2025

1 Commits • 1 Features

Sep 1, 2025

September 2025: Improved capture mechanics for rh-hideout/pokeemerald-expansion by delivering a Catching Charm boost to 100% for Critical Capture odds and refining the RNG to apply the boost correctly based on the number of Pokémon caught. This change enhances player experience, balance, and predictability of capture outcomes with minimal performance impact.

August 2025

3 Commits • 1 Features

Aug 1, 2025

Monthly summary for 2025-08 for TeamREPENTOGON/REPENTOGON focusing on business value and technical achievements. Delivered key feature cleanup of familiar damage rules, and a critical fix to Gideon spawn offset, with targeted documentation updates to improve future maintainability and clarity. Key outcomes in this period include: consolidated and simplified damage rules for familiars by removing variant 100 from damage lists for projectiles and enemies, and removing a redundant check in laser damage condition; documented which familiar types are damaged by enemy contact. Implemented a precise memory offset fix for Gideon SpawnLadder in ASMGridEntitySpawn_Definitions.cpp to correct entity spawning behavior. These changes reduce edge cases, improve stability, and streamline future development and QA. Commits referenced: - 933014add2c5e6522dfee3a6dda4e7484d22ed0a: Milk fix cleanup - d1e26f7edae51ccb1c03fdb050aa43cfe4bad628: Update LuaEntityFamiliar.cpp - 0b47d5d5febfd0ec4468dae75468d9db6d38e0d4: Fix #674

July 2025

4 Commits • 2 Features

Jul 1, 2025

July 2025 monthly summary focusing on delivering practical features for modding and improving maintainability across two repositories. Key work included exposing comprehensive online options to Lua and introducing generation-aware cutscene configuration for better adaptability.

June 2025

3 Commits • 1 Features

Jun 1, 2025

June 2025 performance summary: Delivered targeted feature refinements and critical fixes across two repositories, enhancing user-facing battle messaging and strengthening Lua-driven content placement integrity. The work reduces edge cases, improves safety for mod content, and lays groundwork for scalable content authoring and future enhancements.

May 2025

11 Commits • 5 Features

May 1, 2025

May 2025 performance summary: Delivered core modernization, localization, and visuals across two repositories, strengthening maintainability, user experience, and reach. In TeamREPENTOGON/REPENTOGON, implemented enum-driven refactors and a refined mod-check flow, expanded GRID spawn types and room indices to enable new gameplay areas, and completed Spanish localization replacing hardcoded strings with localized identifiers. In rh-hideout/pokeemerald-expansion, added descriptive move texts for Z-/Max/G-Max moves, refactored common Protect/Detect messaging, expanded test coverage for moves, and refreshed sprites/palettes for Gen 9 Pokémon with normal/shiny variants and adjusted animation data. Overall, these efforts reduce technical debt, improve data-driven patterns, and deliver a richer, more accessible player experience while enabling faster contributor onboarding.

March 2025

9 Commits • 2 Features

Mar 1, 2025

March 2025 performance summary across rh-hideout/pokeemerald-expansion and TeamREPENTOGON/REPENTOGON. Focused on delivering key features to improve testing and gameplay fidelity, addressing data integrity issues, and strengthening robustness of core logic. Highlights include expanded debugging tooling, testable AI behavior, and improvements to user-facing features. See key achievements for details.

January 2025

3 Commits • 2 Features

Jan 1, 2025

January 2025 — Performance-review-ready monthly summary for rh-hideout/pokeemerald-expansion focusing on user-facing features, bug fixes, overall impact, and technology/skill demonstrations.

December 2024

8 Commits • 3 Features

Dec 1, 2024

December 2024 deliverables covered two repositories with a focus on UX improvements, stability, and external dependency compatibility. In rh-hideout/pokeemerald-expansion, we delivered UI/font rendering refinements, updated Pokémon visuals (Ogerpon, Enamorus, Sinistcha) with an Enamorus-Incarnate sprite/animation, and fixed Battle EXP distribution after Hit Escape to ensure XP goes only to actively participating, non-fainted Pokémon. In TeamREPENTOGON/REPENTOGON, we stabilized builds by removing nonessential outputs, bypassing font validation to prevent breaks, and introduced a temporary REPENTANCE flag to maintain compatibility with an external dependency. These changes reduce release risk, improve player experience, and support smoother CI. Representative commits include font and sprite updates, build stability changes, and the Hit Escape EXP fix, among others.

November 2024

2 Commits • 2 Features

Nov 1, 2024

Month: November 2024 (2024-11) focused on UI clarity and visual polish for rh-hideout/pokeemerald-expansion. Key features delivered include: 1) Battle message: display trainer name and class, enabling more contextual battle narration; 2) Pokemon sprite and palette visual improvements, aligning visuals with updated assets and ensuring correct sprite offsets and palette usage.

Activity

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Quality Metrics

Correctness90.0%
Maintainability92.0%
Architecture87.8%
Performance88.8%
AI Usage20.4%

Skills & Technologies

Programming Languages

AssemblyCC++CMakeLuaPalettetext

Technical Skills

API DevelopmentAPI IntegrationAssembly LanguageAssembly PatchingAsset IntegrationAsset ManagementBug FixingBuild SystemBuild System ConfigurationC ProgrammingC programmingC++C++ DevelopmentCode ReadabilityColor Palette Management

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

TeamREPENTOGON/REPENTOGON

Dec 2024 Aug 2025
6 Months active

Languages Used

CC++CMakeLuatext

Technical Skills

Build SystemBuild System ConfigurationC++Game DevelopmentLuaMemory Management

rh-hideout/pokeemerald-expansion

Nov 2024 Mar 2026
12 Months active

Languages Used

CAssemblyPalette

Technical Skills

Asset ManagementC ProgrammingGame DevelopmentGraphics ProgrammingText FormattingAssembly Language