74224b25a5
This is the first commit of the several required to support subprocess-based parallel compilation on OpenGL. This provides the base API and implementation, and exposes the max subprocesses setting on the UI, but it's not used by any code yet. More information and the rest of the code can be found in #121925. This one includes: - A new `GPU_shader_batch` API that allows requesting the compilation of multiple shaders at once, allowing GPU backed to compile them in parallel and asynchronously without blocking the Blender UI. - A virtual `ShaderCompiler` class that backends can use to add their own implementation. - A `ShaderCompilerGeneric` class that implements synchronous/blocking compilation of batches for backends that don't have their own implementation yet. - A `GLShaderCompiler` that supports parallel compilation using subprocesses. - A new `BLI_subprocess` API, including IPC (required for the `GLShaderCompiler` implementation). - The implementation of the subprocess program in `GPU_compilation_subprocess`. - A new `Max Shader Compilation Subprocesses` option in `Preferences > System > Memory & Limits` to enable parallel shader compilation and the max number of subprocesses to allocate (each subprocess has a relatively high memory footprint). Implementation Overview: There's a single `GLShaderCompiler` shared by all OpenGL contexts. This class stores a pool of up to `GCaps.max_parallel_compilations` subprocesses that can be used for compilation. Each subprocess has a shared memory pool used for sending the shader source code from the main Blender process and for receiving the already compiled shader binary from the subprocess. This is synchronized using a series of shared semaphores. The subprocesses maintain a shader cache on disk inside a `BLENDER_SHADER_CACHE` folder at the OS temporary folder. Shaders that fail to compile are tried to be compiled again locally for proper error reports. Hanged subprocesses are currently detected using a timeout of 30s. Pull Request: https://projects.blender.org/blender/blender/pulls/122232 |
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