From 370e480c8c6eee1ffdc2b718eb824112e1710f52 Mon Sep 17 00:00:00 2001 From: Ameer J <52414509+ameerj@users.noreply.github.com> Date: Sun, 6 Mar 2022 10:46:49 -0500 Subject: [PATCH] gl_graphics_pipeline: Improve shader builder synchronization using fences (#7969) * gl_graphics_pipeline: Improve shader builder synchronization Make use of GLsync objects to ensure better synchronization between shader builder threads and the main context * gl_graphics_pipeline: Make built_fence access threadsafe * gl_graphics_pipeline: Use GLsync objects only when building in parallel * gl_graphics_pipeline: Replace GetSync calls with non-blocking waits The spec states that a ClientWait on a Fence object ensures the changes propagate to the calling context --- .../renderer_opengl/gl_graphics_pipeline.cpp | 46 ++++++++++++------- .../renderer_opengl/gl_graphics_pipeline.h | 7 ++- 2 files changed, 32 insertions(+), 21 deletions(-) diff --git a/src/video_core/renderer_opengl/gl_graphics_pipeline.cpp b/src/video_core/renderer_opengl/gl_graphics_pipeline.cpp index f8495896c8..9e6732abd4 100644 --- a/src/video_core/renderer_opengl/gl_graphics_pipeline.cpp +++ b/src/video_core/renderer_opengl/gl_graphics_pipeline.cpp @@ -243,10 +243,6 @@ GraphicsPipeline::GraphicsPipeline( case Settings::ShaderBackend::GLASM: if (!sources[stage].empty()) { assembly_programs[stage] = CompileProgram(sources[stage], AssemblyStage(stage)); - if (in_parallel) { - // Make sure program is built before continuing when building in parallel - glGetString(GL_PROGRAM_ERROR_STRING_NV); - } } break; case Settings::ShaderBackend::SPIRV: @@ -256,20 +252,18 @@ GraphicsPipeline::GraphicsPipeline( break; } } - if (in_parallel && backend != Settings::ShaderBackend::GLASM) { - // Make sure programs have built if we are building shaders in parallel - for (OGLProgram& program : source_programs) { - if (program.handle != 0) { - GLint status{}; - glGetProgramiv(program.handle, GL_LINK_STATUS, &status); - } - } + if (in_parallel) { + std::lock_guard lock{built_mutex}; + built_fence.Create(); + // Flush this context to ensure compilation commands and fence are in the GPU pipe. + glFlush(); + built_condvar.notify_one(); + } else { + is_built = true; } if (shader_notify) { shader_notify->MarkShaderComplete(); } - is_built = true; - built_condvar.notify_one(); }}; if (thread_worker) { thread_worker->QueueWork(std::move(func)); @@ -440,7 +434,7 @@ void GraphicsPipeline::ConfigureImpl(bool is_indexed) { buffer_cache.UpdateGraphicsBuffers(is_indexed); buffer_cache.BindHostGeometryBuffers(is_indexed); - if (!is_built.load(std::memory_order::relaxed)) { + if (!IsBuilt()) { WaitForBuild(); } const bool use_assembly{assembly_programs[0].handle != 0}; @@ -585,8 +579,26 @@ void GraphicsPipeline::GenerateTransformFeedbackState() { } void GraphicsPipeline::WaitForBuild() { - std::unique_lock lock{built_mutex}; - built_condvar.wait(lock, [this] { return is_built.load(std::memory_order::relaxed); }); + if (built_fence.handle == 0) { + std::unique_lock lock{built_mutex}; + built_condvar.wait(lock, [this] { return built_fence.handle != 0; }); + } + ASSERT(glClientWaitSync(built_fence.handle, 0, GL_TIMEOUT_IGNORED) != GL_WAIT_FAILED); + is_built = true; +} + +bool GraphicsPipeline::IsBuilt() noexcept { + if (is_built) { + return true; + } + if (built_fence.handle == 0) { + return false; + } + // Timeout of zero means this is non-blocking + const auto sync_status = glClientWaitSync(built_fence.handle, 0, 0); + ASSERT(sync_status != GL_WAIT_FAILED); + is_built = sync_status != GL_TIMEOUT_EXPIRED; + return is_built; } } // namespace OpenGL diff --git a/src/video_core/renderer_opengl/gl_graphics_pipeline.h b/src/video_core/renderer_opengl/gl_graphics_pipeline.h index 4e28d9a423..311d49f3ff 100644 --- a/src/video_core/renderer_opengl/gl_graphics_pipeline.h +++ b/src/video_core/renderer_opengl/gl_graphics_pipeline.h @@ -100,9 +100,7 @@ public: return writes_global_memory; } - [[nodiscard]] bool IsBuilt() const noexcept { - return is_built.load(std::memory_order::relaxed); - } + [[nodiscard]] bool IsBuilt() noexcept; template static auto MakeConfigureSpecFunc() { @@ -154,7 +152,8 @@ private: std::mutex built_mutex; std::condition_variable built_condvar; - std::atomic_bool is_built{false}; + OGLSync built_fence{}; + bool is_built{false}; }; } // namespace OpenGL