From 3cd6bc2d9eebbdd575164816110717241d9e22db Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Mon, 10 Apr 2023 19:48:07 +0100
Subject: Load assimp textures in parallel

---
 assetFactory/assimp.cpp | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

(limited to 'assetFactory/assimp.cpp')

diff --git a/assetFactory/assimp.cpp b/assetFactory/assimp.cpp
index 55090f4..0c6cb86 100644
--- a/assetFactory/assimp.cpp
+++ b/assetFactory/assimp.cpp
@@ -6,6 +6,7 @@
 #include <assimp/cimport.h>
 #include <assimp/postprocess.h>
 #include <assimp/scene.h>
+#include <future>
 #include <stb/stb_image.h>
 
 template<typename T>
@@ -101,12 +102,18 @@ AssImp::postLoad()
 					return AssetFactory::Shapes::value_type {m->mName.C_Str(), std::make_shared<AssImpNode>(scene, m)};
 				});
 		const auto textures = AIRANGE(scene, Textures);
-		std::transform(textures.begin(), textures.end(),
-				std::inserter(mf->textureFragments, mf->textureFragments.end()), [](const aiTexture * t) {
-					auto texture = std::make_shared<TextureFragment>();
-					texture->id = texture->path = t->mFilename.C_Str();
-					texture->image = std::make_unique<Image>(
-							std::span {reinterpret_cast<unsigned char *>(t->pcData), t->mWidth}, STBI_rgb_alpha);
+		auto textureFutures = textures * [](const aiTexture * t) {
+			return std::async(std::launch::async, [t]() {
+				auto texture = std::make_shared<TextureFragment>();
+				texture->id = texture->path = t->mFilename.C_Str();
+				texture->image = std::make_unique<Image>(
+						std::span {reinterpret_cast<unsigned char *>(t->pcData), t->mWidth}, STBI_rgb_alpha);
+				return texture;
+			});
+		};
+		std::transform(textureFutures.begin(), textureFutures.end(),
+				std::inserter(mf->textureFragments, mf->textureFragments.end()), [](auto && textureFuture) {
+					auto texture = textureFuture.get();
 					return AssetFactory::TextureFragments::value_type {texture->id, texture};
 				});
 	}
-- 
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