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external/loft/modules/base/include/resources/ImageBusWriter.h

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+#pragma once
+
+#include "Gpu.hpp"
+
+class ImageBusWriter {
+private:
+    const Gpu* m_gpu;
+	
+	/**
+	 * Image to which we are writing
+	 */
+	Image *m_pTarget;
+	uint32_t m_formatSize;
+	uint32_t m_imageSize;
+	
+
+	/**
+	 * Intermediate staging buffer to pass data from heap 3 to heap 0
+	 */
+	Buffer m_stagingBuffer;
+	size_t m_stagingBufferSize;
+	VkCommandBuffer m_stagingCommandBuffer;
+
+	/**
+	 * Pointing to where the staging buffer is mapped
+	 */
+	void *m_pMappedData;
+
+
+	std::vector<VkBufferImageCopy> m_writes;
+	uint32_t m_numWrites;
+
+	VkFence m_fence;
+
+	int create_staging_buffer(size_t size);
+
+	int create_staging_command_buffer();
+
+	int create_fence();
+
+public:
+	ImageBusWriter(const Gpu* gpu, Image *pImage,
+				   VkExtent2D extent, uint32_t formatSize,
+				   size_t maxWrites);
+
+	void write(VkBufferImageCopy region, void *pData, size_t size);
+
+    void set_target(Image *pTarget) {
+        flush();
+        m_pTarget = pTarget;
+    }
+
+	void flush();
+};