shadps4-emu/shadPS4
Nov 2024 – Apr 2026
12 Months active
Languages Used
C++MarkdownCCMake
Technical Skills
Bug FixingFile I/OFile System OperationsLow-level ProgrammingSystem ProgrammingDocumentation
Marcin Mikołajczyk
PROFILE
Marcin Mikołajczyk
Marcin Mikolajcz developed core emulation and system features for the shadps4-emu/shadPS4 repository, focusing on low-level programming, shader compilation, and cross-platform networking. Over twelve months, he engineered file system scatter-gather I/O, advanced shader recompilers with 64-bit and atomic operations, and robust network stacks supporting POSIX and Windows APIs. Using C and C++, Marcin integrated asynchronous request handling, memory protection alignment, and modular multiplayer libraries, addressing both performance and compatibility. His work demonstrated depth in system programming and graphics, delivering stable, maintainable solutions that improved rendering fidelity, network reliability, and developer experience across the PS4 emulation stack.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
75Total
Bugs
14
Commits
75
Features
34
Lines of code
8,990
Activity Months12
Your Network
69 peopleWork History
April 2026
4 Commits • 1 Features
Apr 1, 2026April 2026 focused on shadPS4 shader pipeline improvements, delivering key recompiler and correctness work to boost rendering fidelity and stability. Implemented VOP3P instruction support and MS priority over LOD in image opcodes to improve MSAA rendering accuracy. Applied targeted shader processing fixes in geometry shader handling and vertex sizing, and refined RingAccessElimination correctness. These changes reduce rendering artifacts, improve game compatibility, and lay groundwork for future shader optimization and reliability.
4 Commits • 1 Features
Apr 1, 2026April 2026 focused on shadPS4 shader pipeline improvements, delivering key recompiler and correctness work to boost rendering fidelity and stability. Implemented VOP3P instruction support and MS priority over LOD in image opcodes to improve MSAA rendering accuracy. Applied targeted shader processing fixes in geometry shader handling and vertex sizing, and refined RingAccessElimination correctness. These changes reduce rendering artifacts, improve game compatibility, and lay groundwork for future shader optimization and reliability.
April 2026
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 performance summary for shadPS4-emu/shadPS4: Delivered the NpTus System: Asynchronous Request and Context Management feature, with groundwork for improved concurrency and data handling for user services. Implemented object lifecycle management for requests and contexts to improve structure, robustness, and maintainability of the NpTus library. Stabilized asynchronous flows by addressing issues encountered with NpTus functions during development. This work enhances scalability and reliability for online play services, aligning with strategic goals to improve responsiveness and developer productivity. Key commit: 99661aa6b3ba7da57eec720d41bca55ae631f8c0.
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 performance summary for shadPS4-emu/shadPS4: Delivered the NpTus System: Asynchronous Request and Context Management feature, with groundwork for improved concurrency and data handling for user services. Implemented object lifecycle management for requests and contexts to improve structure, robustness, and maintainability of the NpTus library. Stabilized asynchronous flows by addressing issues encountered with NpTus functions during development. This work enhances scalability and reliability for online play services, aligning with strategic goals to improve responsiveness and developer productivity. Key commit: 99661aa6b3ba7da57eec720d41bca55ae631f8c0.
January 2026
5 Commits • 3 Features
Jan 1, 20262026-01 monthly summary for shadPS4-emu/shadPS4. Delivered foundational capabilities to accelerate shader processing and multiplayer/cross-save workflows, enabling future business value and faster feature delivery. Features delivered include: (1) Shader Recompiler with 64-bit and bitwise support (V_LSHR_B64), 64-bit floating-point comparisons, and V_FFBH_I32 bit extraction, backed by commits 1e059cac04426deef931ed9198a824083bca8038; (2) NpTus library integration scaffolding for user data management and cross-save workflows with stubbed functions and logging, commit 39a7738d0418a994726ba15ff0ed17591c8b9bb2; (3) NpMatching2 library introduction to enable multiplayer features such as room creation, user management, and event handling, commit c0987ecc73821a7b8ef8d1b87a215b5a9c819808. These changes establish a solid architectural foundation and pave the way for full feature implementations. Major bugs fixed: none reported this month. Overall impact: improved shader correctness and performance groundwork, cross-save and multiplayer infrastructure preparation, and stronger commit traceability to support faster follow-on work. Technologies/skills demonstrated: C/C++ library integration, shader pipeline extension, modular architecture, header/source scaffolding, and robust change-tracking.
5 Commits • 3 Features
Jan 1, 20262026-01 monthly summary for shadPS4-emu/shadPS4. Delivered foundational capabilities to accelerate shader processing and multiplayer/cross-save workflows, enabling future business value and faster feature delivery. Features delivered include: (1) Shader Recompiler with 64-bit and bitwise support (V_LSHR_B64), 64-bit floating-point comparisons, and V_FFBH_I32 bit extraction, backed by commits 1e059cac04426deef931ed9198a824083bca8038; (2) NpTus library integration scaffolding for user data management and cross-save workflows with stubbed functions and logging, commit 39a7738d0418a994726ba15ff0ed17591c8b9bb2; (3) NpMatching2 library introduction to enable multiplayer features such as room creation, user management, and event handling, commit c0987ecc73821a7b8ef8d1b87a215b5a9c819808. These changes establish a solid architectural foundation and pave the way for full feature implementations. Major bugs fixed: none reported this month. Overall impact: improved shader correctness and performance groundwork, cross-save and multiplayer infrastructure preparation, and stronger commit traceability to support faster follow-on work. Technologies/skills demonstrated: C/C++ library integration, shader pipeline extension, modular architecture, header/source scaffolding, and robust change-tracking.
January 2026
September 2025
7 Commits • 2 Features
Sep 1, 2025Concise monthly summary for 2025-09 focused on delivering network reliability, cross-platform IO, and stability improvements in shadPS4. Key activities centered on expanding the network stack with AF_UNIX socket support and epoll-based event handling (with wepoll integration on Windows), stabilizing audio and event-flag safety, and laying groundwork for future social features. These efforts improved performance, portability across targets, and user-facing stability for games and tools relying on the PS4 emulation stack.
September 2025
7 Commits • 2 Features
Sep 1, 2025Concise monthly summary for 2025-09 focused on delivering network reliability, cross-platform IO, and stability improvements in shadPS4. Key activities centered on expanding the network stack with AF_UNIX socket support and epoll-based event handling (with wepoll integration on Windows), stabilizing audio and event-flag safety, and laying groundwork for future social features. These efforts improved performance, portability across targets, and user-facing stability for games and tools relying on the PS4 emulation stack.
August 2025
5 Commits • 2 Features
Aug 1, 2025Monthly summary for 2025-08 focusing on networking subsystems in shadPS4. Delivered cross-platform socket API enhancements, corrected socket option handling, and introduced default network configuration checks to support offline scenarios. These changes reduce configuration errors, improve reliability and Windows compatibility, and lay groundwork for resilient connectivity in future releases.
5 Commits • 2 Features
Aug 1, 2025Monthly summary for 2025-08 focusing on networking subsystems in shadPS4. Delivered cross-platform socket API enhancements, corrected socket option handling, and introduced default network configuration checks to support offline scenarios. These changes reduce configuration errors, improve reliability and Windows compatibility, and lay groundwork for resilient connectivity in future releases.
August 2025
July 2025
19 Commits • 4 Features
Jul 1, 2025July 2025 monthly highlights for shadPS4: Delivered foundational enhancements to shader recompiler, executable memory mappings, and broad system integration, strengthening compatibility and performance across graphics, audio, filesystem, and network subsystems. Focused on stabilizing audio/pad handling, expanding POSIX exposure, and wiring core network features to support modern software stacks.
July 2025
19 Commits • 4 Features
Jul 1, 2025July 2025 monthly highlights for shadPS4: Delivered foundational enhancements to shader recompiler, executable memory mappings, and broad system integration, strengthening compatibility and performance across graphics, audio, filesystem, and network subsystems. Focused on stabilizing audio/pad handling, expanding POSIX exposure, and wiring core network features to support modern software stacks.
June 2025
13 Commits • 9 Features
Jun 1, 2025June 2025 performance summary for shadPS4/shadPS4. Delivered significant SPIR-V backend improvements, enhanced data sharing and memory semantics, and Vulkan feature exposure, enabling more reliable compute and rendering workloads. Key outcomes include improved atomic memory operations, expanded data sharing instructions with bounds checks, and memory configuration robustness across configurations, along with Vulkan feature readiness and SPIR-V capabilities for immediate sampling.
13 Commits • 9 Features
Jun 1, 2025June 2025 performance summary for shadPS4/shadPS4. Delivered significant SPIR-V backend improvements, enhanced data sharing and memory semantics, and Vulkan feature exposure, enabling more reliable compute and rendering workloads. Key outcomes include improved atomic memory operations, expanded data sharing instructions with bounds checks, and memory configuration robustness across configurations, along with Vulkan feature readiness and SPIR-V capabilities for immediate sampling.
June 2025
May 2025
12 Commits • 5 Features
May 1, 2025May 2025 monthly summary for shadPS4 development focusing on robustness, correctness, and shader/emulation capabilities. Key outcomes include memory protection hardening, kernel stack detection, shader recompiler enhancements, and critical fixes that improve stability and rendering fidelity, with clear business impact in stability and feature parity for emulated PS4 workloads. Highlights: - Implemented Memory Protection Alignment to operate protections on whole 16KB pages for robust memory management (commits 3a3a6d8e450557efa2ed4151db02c6c62cc8af2f). - Added sceKernelIsStack to accurately classify addresses as stack with kernel boundary checks (commit 1832ec2ac2f9fe1a507a34fb2734cd6b6f3490a9). - Expanded Shader Recompiler with 64-bit float conversion and 128-bit MIMG support, plus VccLo handling for FP values and related opcodes fixes (commits 8fffdc39186f1748460c637fab251271fbc257d7, 2091bc56513fd072ae8477b51c9a20be7817e618, 790b54bf2953fd03b933c2e5d5247db41b76444a). - Corrected SGPR post-increment usage in S_LOAD_DWORD/S_BUFFER_LOAD_DWORD by switching to direct index-based access, preventing edge-case failures in shader compilation contexts (commit 6abda17532fbf1e44e4ced877f79db33845a347c). - Fixed Buffer-to-Image copy image extent calculations when mipmap pitch is zero, eliminating rendering artifacts (commit e518a7062c6b26c9fad8966f229f9a597d52bb44).
May 2025
12 Commits • 5 Features
May 1, 2025May 2025 monthly summary for shadPS4 development focusing on robustness, correctness, and shader/emulation capabilities. Key outcomes include memory protection hardening, kernel stack detection, shader recompiler enhancements, and critical fixes that improve stability and rendering fidelity, with clear business impact in stability and feature parity for emulated PS4 workloads. Highlights: - Implemented Memory Protection Alignment to operate protections on whole 16KB pages for robust memory management (commits 3a3a6d8e450557efa2ed4151db02c6c62cc8af2f). - Added sceKernelIsStack to accurately classify addresses as stack with kernel boundary checks (commit 1832ec2ac2f9fe1a507a34fb2734cd6b6f3490a9). - Expanded Shader Recompiler with 64-bit float conversion and 128-bit MIMG support, plus VccLo handling for FP values and related opcodes fixes (commits 8fffdc39186f1748460c637fab251271fbc257d7, 2091bc56513fd072ae8477b51c9a20be7817e618, 790b54bf2953fd03b933c2e5d5247db41b76444a). - Corrected SGPR post-increment usage in S_LOAD_DWORD/S_BUFFER_LOAD_DWORD by switching to direct index-based access, preventing edge-case failures in shader compilation contexts (commit 6abda17532fbf1e44e4ced877f79db33845a347c). - Fixed Buffer-to-Image copy image extent calculations when mipmap pitch is zero, eliminating rendering artifacts (commit e518a7062c6b26c9fad8966f229f9a597d52bb44).
April 2025
2 Commits • 2 Features
Apr 1, 20252025-04 Monthly Summary: Focused on performance-oriented feature delivery and cross-repo compatibility improvements. Key work this month included two high-impact features with clear business value: (1) Scatter-Gather I/O support for the file system to enable multi-buffer writes at a specified offset, enhancing write throughput and efficiency; (2) FP32 atomic min/max support in SPIR-V shaders with appropriate extension/capability handling and a fallback path for older hardware to preserve compatibility. These changes reduce I/O bottlenecks, expand shader capabilities across hardware, and lay groundwork for future optimizations across the stack. Overall, delivered measurable improvements in file-system performance and shader correctness/compatibility while maintaining stability across platforms.
2 Commits • 2 Features
Apr 1, 20252025-04 Monthly Summary: Focused on performance-oriented feature delivery and cross-repo compatibility improvements. Key work this month included two high-impact features with clear business value: (1) Scatter-Gather I/O support for the file system to enable multi-buffer writes at a specified offset, enhancing write throughput and efficiency; (2) FP32 atomic min/max support in SPIR-V shaders with appropriate extension/capability handling and a fallback path for older hardware to preserve compatibility. These changes reduce I/O bottlenecks, expand shader capabilities across hardware, and lay groundwork for future optimizations across the stack. Overall, delivered measurable improvements in file-system performance and shader correctness/compatibility while maintaining stability across platforms.
April 2025
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025: Shader recompiler enhancements for the shadPS4 project. Implemented 64-bit shift support (S_LSHL_B64) and 64-bit arithmetic right shifts (S_ASHR_I64) in the translation layer, and refined masking for the 32-bit arithmetic right shift (S_ASHR_I32). These changes improve correctness and compatibility for 64-bit shader workloads, reduce edge-case behavior in translation, and align with the project roadmap. Landed with commit 9dcf40e261c6775a997b92d26a4bd8113821c6ab (Translator #1825).
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025: Shader recompiler enhancements for the shadPS4 project. Implemented 64-bit shift support (S_LSHL_B64) and 64-bit arithmetic right shifts (S_ASHR_I64) in the translation layer, and refined masking for the 32-bit arithmetic right shift (S_ASHR_I32). These changes improve correctness and compatibility for 64-bit shader workloads, reduce edge-case behavior in translation, and align with the project roadmap. Landed with commit 9dcf40e261c6775a997b92d26a4bd8113821c6ab (Translator #1825).
December 2024
4 Commits • 3 Features
Dec 1, 2024Month 2024-12 focused on delivering core architecture improvements and usability enhancements for shadPS4. Key features delivered include recursive INDIRECT_BUFFER_CONST processing in ProcessCeUpdate to ensure complete task processing prior to yielding, and SPIR-V image format support for 32-bit signed integers (R32i) in the emission path. A critical bug fix addressed Vcc register handling in Translator::SetDst64 to eliminate an unreachable path and ensure correct low/high parts. Additionally, Mac users gained improved usability via updated keyboard mappings in README, aligning controller mappings with Mac layouts. These contributions improve reliability, broaden compatibility, and enhance developer experience while maintaining performance gains.
4 Commits • 3 Features
Dec 1, 2024Month 2024-12 focused on delivering core architecture improvements and usability enhancements for shadPS4. Key features delivered include recursive INDIRECT_BUFFER_CONST processing in ProcessCeUpdate to ensure complete task processing prior to yielding, and SPIR-V image format support for 32-bit signed integers (R32i) in the emission path. A critical bug fix addressed Vcc register handling in Translator::SetDst64 to eliminate an unreachable path and ensure correct low/high parts. Additionally, Mac users gained improved usability via updated keyboard mappings in README, aligning controller mappings with Mac layouts. These contributions improve reliability, broaden compatibility, and enhance developer experience while maintaining performance gains.
December 2024
November 2024
2 Commits • 1 Features
Nov 1, 2024Monthly performance summary for 2024-11 for repository shadps4-emu/shadPS4 focusing on stability improvements and IO capability expansion.
November 2024
2 Commits • 1 Features
Nov 1, 2024Monthly performance summary for 2024-11 for repository shadps4-emu/shadPS4 focusing on stability improvements and IO capability expansion.
Activity
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Quality Metrics
Correctness88.4%
Maintainability86.6%
Architecture85.8%
Performance81.0%
AI Usage20.8%
Skills & Technologies
Programming Languages
CC++CMakeMarkdown
Technical Skills
Asynchronous OperationsAudio ProgrammingBug FixingBuild System ConfigurationBuild Systems (CMake)CC++C++ developmentCompiler DevelopmentCompute ShadersConfiguration ManagementCross-Platform DevelopmentDebuggingDocumentationDriver development
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