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[Feat] (MG_Backend/DirectGLES): advertise GL_KHR_parallel_shader_compile when async is enabled

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Gated on the configuration flag on purpose: the string is the one change a
retrace can never cover (Iris/Sodium pipeline their submissions differently
once they see it), so the kill switch has to withdraw the app-visible
behaviour along with the threading.
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BZLZHH
2026-08-08 13:17:58 -04:00
parent bd0def6133
commit f15cb8900f
1 changed files with 17 additions and 0 deletions
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MobileGL/MG_Backend/DirectGLES/BackendObject_DirectGLES.cpp
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@@ -18,6 +18,7 @@
#include <MG_Util/Converters/MGToGL/TextureEnumConverter.h>
#include <MG_Util/Converters/MGToStr/TextureEnumConverter.h>
#include <MG_Util/Texture/TextureFormatProcessor.h>
#include <MG_Util/Async/ShaderCompilePool.h>
#include <Config.h>
#include <algorithm>
#include <cmath>
@@ -891,6 +892,22 @@ namespace MobileGL::MG_Backend::DirectGLES {
// extension explicitly permits. It is also the only thing that
// exposes glProgramParameteri before GL 4.1.
E_GL_ARB_get_program_binary};
// GL_KHR_parallel_shader_compile is MobileGL's own capability, not the host ES
// driver's: the compiler threads are MobileGL's, and glCompileShader/glLinkProgram
// are serviced entirely inside the frontend. Whether the device driver advertises
// the string is irrelevant here (the POST reports it separately, for the day the
// driver-side link is what gets parallelised).
//
// Gated on the async flag deliberately, and this is the whole reason the gate
// exists. Advertising the string is the one part of asynchronous compilation that a
// recorded trace can never cover: Iris and Sodium change their SUBMISSION SCHEDULE
// the moment they see it - they enqueue whole pipeline batches and poll
// GL_COMPLETION_STATUS_KHR instead of compiling one program at a time - so
// MOBILEGL_ASYNC_SHADER_COMPILE=0 has to withdraw the application-visible behaviour
// change as well as the threading, or the kill switch would only be half a switch.
if (MG_Util::Async::AsyncShaderCompileEnabled()) {
extensions.push_back(E_GL_KHR_parallel_shader_compile);
}
// Only advertised when the device driver actually has usable timer queries
// (GL_EXT_disjoint_timer_query plus its entry points) and the
// MOBILEGL_DISABLE_TIMERQUERY escape hatch is off.