Add texture cache for ar frame textures

openVulkanoCpp/Vulkan/Metal/MetalTextureCache.mm

@@ -0,0 +1,63 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include "MetalTextureCache.h"
+#include "Vulkan/Renderer.hpp"
+
+namespace OpenVulkano::Vulkan
+{
+	void MetalTextureCache::Init(IRenderer* renderer)
+	{
+		if (m_resourceManager) Close();
+		if (!renderer) return;
+		auto vkRenderer = dynamic_cast<Vulkan::Renderer*>(renderer);
+		if (!vkRenderer) throw std::invalid_argument("The Metal Texture Cache only supports Vulkan renderer!");
+		// Setup texture cache
+		VkExportMetalDeviceInfoEXT metalDeviceInfo {};
+		metalDeviceInfo.sType = VK_STRUCTURE_TYPE_EXPORT_METAL_DEVICE_INFO_EXT;
+		metalDeviceInfo.pNext = nullptr;
+		VkExportMetalObjectsInfoEXT exportInfo { VK_STRUCTURE_TYPE_EXPORT_METAL_OBJECTS_INFO_EXT, &metalDeviceInfo };
+		VkDevice vkDevice = vkRenderer->GetContext().device->device;
+		vkExportMetalObjectsEXT(vkDevice, &exportInfo);
+		CVReturn result = CVMetalTextureCacheCreate(nil, nil, metalDeviceInfo.mtlDevice, nil, &m_textureCache);
+		if (result != kCVReturnSuccess)
+		{
+			Logger::AR->error("Failed to create metal texture cache! Status code: {}", result);
+		}
+		m_resourceManager = &vkRenderer->GetResourceManager();
+	}
+
+	Scene::Texture* MetalTextureCache::Get(CVPixelBufferRef pixelBuffer, MTLPixelFormat pixelFormat)
+	{
+		CVMetalTextureRef mtlTextureRef;
+		auto width = CVPixelBufferGetWidthOfPlane(pixelBuffer, 0);
+		auto height = CVPixelBufferGetHeightOfPlane(pixelBuffer, 0);
+		//TODO check pixel format from buffer?
+		CVMetalTextureCacheCreateTextureFromImage(nil, m_textureCache, pixelBuffer, nil, pixelFormat, width, height, 0, &mtlTextureRef);
+		id<MTLTexture> mtlTexture = CVMetalTextureGetTexture(mtlTextureRef);
+		CVBufferRelease(mtlTextureRef);
+		MetalBackedTexture& texture = m_mtlToVkTextureMap[static_cast<void*>(mtlTexture)];
+		if (!texture)
+		{ // Init texture
+			texture.Init(m_resourceManager, mtlTexture, false);
+			Logger::RENDER->info("Metal Texture Cache grew to: {}", m_mtlToVkTextureMap.size());
+		}
+		return &texture;
+	}
+
+	void MetalTextureCache::ReturnTexture(Scene::Texture* texture)
+	{
+
+	}
+
+	void MetalTextureCache::Close()
+	{
+		m_mtlToVkTextureMap.clear();
+		m_resourceManager = nullptr;
+		//TODO delete the texture cache object?
+		m_textureCache = nullptr;
+	}
+}