Vulkan: Load shaders/pipelines on thread.

In case it's slow when not reading raw cache data.

GPU/Vulkan/GPU_Vulkan.cpp

@@ -16,6 +16,7 @@
 // Official git repository and contact information can be found at
 // https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
 
+#include <thread>
 #include "base/logging.h"
 #include "profiler/profiler.h"
 
@@ -101,11 +102,20 @@ GPU_Vulkan::GPU_Vulkan(GraphicsContext *gfxCtx, Draw::DrawContext *draw)
 	if (discID.size()) {
 		File::CreateFullPath(GetSysDirectory(DIRECTORY_APP_CACHE));
 		shaderCachePath_ = GetSysDirectory(DIRECTORY_APP_CACHE) + "/" + discID + ".vkshadercache";
+		shaderCacheLoaded_ = false;
 
-		LoadCache(shaderCachePath_);
+		std::thread th([&] {
+			LoadCache(shaderCachePath_);
+			shaderCacheLoaded_ = true;
+		});
+		th.detach();
 	}
 }
 
+bool GPU_Vulkan::IsReady() {
+	return shaderCacheLoaded_;
+}
+
 void GPU_Vulkan::LoadCache(std::string filename) {
 	PSP_SetLoading("Loading shader cache...");
 	// Actually precompiled by IsReady() since we're single-threaded.

GPU/Vulkan/GPU_Vulkan.h

@@ -38,6 +38,8 @@ class GPU_Vulkan : public GPUCommon {
 	// This gets called on startup and when we get back from settings.
 	void CheckGPUFeatures() override;
 
+	bool IsReady() override;
+
 	// These are where we can reset command buffers etc.
 	void BeginHostFrame() override;
 	void EndHostFrame() override;
@@ -105,4 +107,5 @@ class GPU_Vulkan : public GPUCommon {
 	FrameData frameData_[VulkanContext::MAX_INFLIGHT_FRAMES]{};
 
 	std::string shaderCachePath_;
+	bool shaderCacheLoaded_ = false;
 };

GPU/Vulkan/PipelineManagerVulkan.cpp

@@ -602,12 +602,12 @@ bool PipelineManagerVulkan::LoadCache(FILE *file, bool loadRawPipelineCache, Sha
 		} else {
 			vkMergePipelineCaches(vulkan_->GetDevice(), pipelineCache_, 1, &cache);
 		}
+		NOTICE_LOG(G3D, "Loaded Vulkan pipeline cache (%d bytes).", (int)size);
 	} else {
 		if (!pipelineCache_) {
 			VkPipelineCacheCreateInfo pc{ VK_STRUCTURE_TYPE_PIPELINE_CACHE_CREATE_INFO };
 			VkResult res = vkCreatePipelineCache(vulkan_->GetDevice(), &pc, nullptr, &pipelineCache_);
 		}
-		NOTICE_LOG(G3D, "Loaded Vulkan pipeline cache (%d bytes).", (int)size);
 	}
 
 	// Read the number of pipelines.