Release v0.12.1 of jGenesis: A Major Update with Bug Fixes and Performance Enhancements

The jGenesis team is pleased to announce the release of v0.12.1, a significant update that addresses several critical issues and introduces notable performance enhancements. This new version is a mostly-bugfix release, primarily designed to rectify a regression in v0.12.0 that affected turbo input mappings. In this blog post, we will delve into the key changes, improvements, and fixes included in this update, providing a comprehensive overview of what's new and exciting in jGenesis v0.12.1.

Bug Fixes and Improvements

One of the primary concerns addressed in v0.12.1 is the regression in v0.12.0 that rendered turbo input mappings non-functional. This was a critical issue that prevented users from utilizing this feature effectively. The jGenesis team has meticulously revised the code to rectify this problem, ensuring that turbo input mappings now function as intended.

Another significant improvement is the compression of the rewind buffer in memory. This compression technique has resulted in a substantial decrease in RAM usage, particularly when emulating Sega CD or 32X. The exact savings will vary depending on the system being emulated, but as an example, a 10-second rewind buffer now takes 40-80 MB of RAM instead of approximately 600 MB. This compression is performed asynchronously, ensuring that it does not impact the emulator's performance.

Additionally, save states are now compressed and written to disk asynchronously. This change has made it significantly less likely that saving state will cause the emulator to stutter. These improvements demonstrate the jGenesis team's commitment to refining the emulator's performance and functionality.

Settings Changes

In v0.12.1, the settings file location has been modified on Windows. By default, the settings file is now stored in a user profile-level directory. This change allows settings to be automatically shared between different copies of the emulator in different directories, mirroring the behavior on other platforms. However, users who prefer the old Windows behavior can easily restore it by following the instructions below:

• On Windows, navigate to Settings > Paths and switch the settings file location or create a portable.txt file in the emulator directory (contents do not matter; the file only needs to exist).
• On all platforms, users can create a portable.txt file in the emulator directory to restore the old behavior.

Changelog

The full changelog for v0.12.1 includes the following changes:

• Settings Changes:
  • On Windows, the settings file is now stored in a user profile directory by default.
  • Users can restore the old Windows behavior by switching the settings file location in Settings > Paths or creating a portable.txt file in the emulator directory.
  • The --config command line argument still overrides all settings behavior.
• Improvements:
  • The rewind buffer is now compressed in memory, significantly decreasing RAM usage.
  • Save states are now compressed and written to disk asynchronously.
• Fixes:
  • Fixed turbo input mappings not working properly.
  • Fixed all settings reverting to defaults when a single setting fails to deserialize from the config file.
  • (SNES) Cartridges specifying nonsensically high amounts of SRAM in the cartridge header now receive 256 KB of SRAM instead of none.

Conclusion

The release of v0.12.1 marks an important milestone in the evolution of jGenesis. This update corrects critical issues, enhances performance, and introduces improvements that will undoubtedly benefit the jGenesis community. The jGenesis team's dedication to refining the emulator's functionality and performance is evident in this release. We encourage all users to update to v0.12.1 and experience the benefits of this update firsthand.

Getting Started with v0.12.1

To update to v0.12.1, simply download the latest binary from the jGenesis GitHub repository and follow the installation instructions. If you encounter any issues or have questions, please refer to the jGenesis documentation or seek help from the community.

Setup Guide for jsgroth/jgenesis Release v0.12.1: Optimized for Mesa Turnip Drivers and Snapdragon

Table of Contents

1. Hardware Requirements
2. Software Requirements
3. Installation and Setup
   1. Cloning the Repository
   2. Setting Up the Build Environment
4. Mesa Turnip Drivers Configuration
   1. Enabling Turnip Drivers
   2. Turning on Experimental Features
   3. Adjusting Turnip Driver Settings
5. Snapdragon Optimizations
   1. Enabling Snapdragon Optimization Flags
   2. Tuning Snapdragon Performance
6. Building and Running jgenesis
7. Troubleshooting

Hardware Requirements

• A 64-bit CPU (Intel or AMD)
• 8 GB of RAM or more
• A supported graphics card (NVIDIA or AMD)
• A 64-bit operating system (Ubuntu, Debian, or Fedora)
• A compatible storage device (SSD or HDD)

Software Requirements

• git for version control
• make for building
• ninja for building (optional)
• cmake for configuration
• mesa-sdk for Mesa Turnip drivers
• snapdragon-utils for Snapdragon optimizations

Installation and Setup

Cloning the Repository

To set up jgenesis, start by cloning the repository using git: bash git clone https://github.com/jsgroth/jgenesis.git cd jgenesis

Setting Up the Build Environment

Next, install the necessary dependencies using your package manager:

• Ubuntu/Debian: sudo apt-get install build-essential ninja-build cmake git
• Fedora: sudo dnf install make ninja-build cmake git
• Other distributions: consult your package manager's documentation

Create a build directory and navigate into it: bash mkdir build cd build

Run cmake to configure the build environment: bash cmake ..

This will generate a build system in the build directory.

Mesa Turnip Drivers Configuration

Enabling Turnip Drivers

To enable Mesa Turnip drivers, add the following flag to the CMAKE_BUILD_TYPE variable in your CMakeLists.txt file: cmake set(CMAKE_BUILD_TYPE "Release") set(CMAKE_CXX_FLAGS "-O3 -march=native")

Turning on Experimental Features

To turn on experimental features for Turnip drivers, add the following flag to the CMAKE_CXX_FLAGS variable: cmake set(CMAKE_CXX_FLAGS "-DTURNIP_EXPERIMENTAL_FEATURES")

Adjusting Turnip Driver Settings

To adjust Turnip driver settings, create a file called turnip_settings.cmake in the root of your repository with the following contents: cmake set(TURNIP_SETTINGS "enable_gpgpu=1" "enable_shader_cache=1" "enable_tiled_shader_cache=1" )

Then, add the following flag to the CMAKE_CXX_FLAGS variable: cmake set(CMAKE_CXX_FLAGS "-DTURNIP_SETTINGS=${TURNIP_SETTINGS}")

Snapdragon Optimizations

Enabling Snapdragon Optimization Flags

To enable Snapdragon optimization flags, add the following flag to the CMAKE_CXX_FLAGS variable: cmake set(CMAKE_CXX_FLAGS "-DSNAPDRAGON_OPTIMIZATIONS")

Tuning Snapdragon Performance

To tune Snapdragon performance, create a file called snapdragon_settings.cmake in the root of your repository with the following contents: cmake set(SNAPDRAGON_SETTINGS "performance_mode=1" "power_mode=0" "scheduler=0" )

Then, add the following flag to the CMAKE_CXX_FLAGS variable: cmake set(CMAKE_CXX_FLAGS "-DSNAPDRAGON_SETTINGS=${SNAPDRAGON_SETTINGS}")

Building and Running jgenesis

To build jgenesis, run make in the build directory: bash make

This will build jgenesis using the configured build environment.

To run jgenesis, execute the generated executable in the build directory: bash ./jgenesis

This will launch the jgenesis application with the optimized settings.

Troubleshooting

If you encounter issues during the setup process, consult the following troubleshooting tips:

• Ensure that you have the necessary dependencies installed.
• Verify that the CMAKE_BUILD_TYPE variable is set to "Release" and that the CMAKE_CXX_FLAGS variable is correctly configured.
• Check that the turnip_settings.cmake and snapdragon_settings.cmake files are correctly created and that the flags are properly applied.
• Consult the jgenesis documentation and the Mesa Turnip drivers documentation for further information.

By following this setup guide, you should be able to successfully configure and build jgenesis with optimized settings for Mesa Turnip drivers and Snapdragon optimizations.

Troubleshooting FAQ and Best Practices for JGenesis v0.12.1

Table of Contents

1. System Requirements
2. Installation and Configuration
3. Common Issues and Solutions
4. Performance Optimization
5. 60FPS XML Container Settings Guide

System Requirements

Before troubleshooting, ensure your system meets the minimum requirements for running JGenesis v0.12.1:

• Operating System: Windows 10 or later, macOS High Sierra or later, or Linux (Ubuntu or later)
• Processor: Intel Core i5 or AMD equivalent
• RAM: 16 GB or more
• Graphics Card: NVIDIA GeForce GTX 1060 or AMD Radeon RX 580
• Storage: 1 TB or more

Installation and Configuration

If you're experiencing issues during installation or configuration, follow these steps:

• Ensure you have the latest version of Java installed (Java 11 or later recommended)
• Download the JGenesis v0.12.1 zip file from the official repository
• Extract the contents to a folder on your computer
• Run the jgenesis.sh or jgenesis.bat file (depending on your operating system) to launch the application
• Follow the in-game instructions to configure your settings

Common Issues and Solutions

Here are some common issues and their solutions:

• Crashing on startup:
• Solution: Check if you're using the correct Java version. Ensure you have the latest version installed.
• Solution: If you're using a 32-bit system, try running the application in 64-bit mode.
• Graphics issues:
• Solution: Update your graphics drivers to the latest version.
• Solution: Try disabling any graphics-intensive plugins or mods.
• Audio issues:
• Solution: Check if your audio drivers are up to date.
• Solution: Try disabling any audio plugins or mods.
• Performance issues:
• Solution: Close any unnecessary programs or background applications.
• Solution: Try reducing the game's graphics settings or updating your graphics drivers.

Performance Optimization

To optimize performance, follow these best practices:

• Close unnecessary programs: Close any unnecessary programs or background applications to free up system resources.
• Update graphics drivers: Ensure your graphics drivers are up to date to take advantage of the latest performance enhancements.
• Reduce graphics settings: If you're experiencing performance issues, try reducing the game's graphics settings.
• Use a dedicated graphics card: If possible, use a dedicated graphics card to improve performance.

60FPS XML Container Settings Guide

To achieve 60FPS in JGenesis v0.12.1, you'll need to configure the XML container settings. Here's a step-by-step guide:

1. Create a new XML file: Create a new text file with a .xml extension (e.g., settings.xml).

2. Add the container element: Add the following code to the XML file: xml 1920 1080 60 true Vertical

3. Update the width and height attributes: Set the width and height attributes to your desired resolution (e.g., 1920x1080).

4. Set the fps attribute: Set the fps attribute to 60 to enable 60FPS mode.
5. Enable VSync: Set the vsync attribute to true to enable Vertical Sync.
6. Set the sync mode: Set the syncMode attribute to Vertical to enable vertical sync.

Example XML File xml

1920 1080 60 true Vertical

Tips and Tricks

• Use a high-performance graphics card: If possible, use a high-performance graphics card to improve performance.
• Close any unnecessary programs: Close any unnecessary programs or background applications to free up system resources.
• Use a 60Hz monitor: Use a 60Hz monitor to take advantage of the 60FPS setting.
• Experiment with different settings: Experiment with different settings (e.g., graphics settings, resolution, FPS) to find the optimal balance between performance and visual quality.

By following these troubleshooting FAQs and best practices, you should be able to resolve common issues and achieve 60FPS in JGenesis v0.12.1.

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