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Metal: Compile MTLLibrary on demand when pipeline is created

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This changes the default shader loading strategy, implemented in the
Metal driver, to compile the `MTLLibrary` on demand when the pipeline
is created, which reduces cold startup time on IPHONE target OSs.

Normally, the `MTLLibrary` is compiled from Metal source asynchronously
when Godot calls
`RenderingDeviceDriverMetal::shader_create_from_bytecode`; however, this
changes this behaviour on mobile platforms to do it on demand when the
pipeline is created, as noted in #96052, Godot will ask to create
many more shaders from bytecode than are initially required. Mobile
OSs like iOS are limited to compiling to shader libraries concurrently,
which results in a significant bottleneck.

This is not the default for macOS, as it can concurrently compile many
shaders at once, resulting in faster startup times for the Godot editor.
This commit is contained in:
Stuart Carnie 2025-02-23 05:59:41 +11:00
parent 394508d26d
commit 818afcb327
1 changed files with 5 additions and 0 deletions
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5
drivers/metal/rendering_device_driver_metal.mm
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@ -4082,9 +4082,14 @@ RenderingDeviceDriverMetal::RenderingDeviceDriverMetal(RenderingContextDriverMet
context_driver(p_context_driver) { context_driver(p_context_driver) {
DEV_ASSERT(p_context_driver != nullptr); DEV_ASSERT(p_context_driver != nullptr);
#if TARGET_OS_OSX
if (String res = OS::get_singleton()->get_environment("GODOT_MTL_SHADER_LOAD_STRATEGY"); res == U"lazy") { if (String res = OS::get_singleton()->get_environment("GODOT_MTL_SHADER_LOAD_STRATEGY"); res == U"lazy") {
_shader_load_strategy = ShaderLoadStrategy::LAZY; _shader_load_strategy = ShaderLoadStrategy::LAZY;
} }
#else
// Always use the lazy strategy on other OSs like iOS, tvOS, or visionOS.
_shader_load_strategy = ShaderLoadStrategy::LAZY;
#endif
} }
RenderingDeviceDriverMetal::~RenderingDeviceDriverMetal() { RenderingDeviceDriverMetal::~RenderingDeviceDriverMetal() {