From a1022e0e30bf752f6f2d33b02c5d39fbf0343d7a Mon Sep 17 00:00:00 2001
From: Benjamin Kraft <benjamin.kraft@online.de>
Date: Thu, 29 Aug 2024 12:01:12 +0200
Subject: [PATCH] vertex buffer basic

---
 src/main.cpp | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/src/main.cpp b/src/main.cpp
index 911fd2e..4d9d464 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -146,6 +146,7 @@ private:
 		createRenderPass();
 		createGraphicsPipeline();
 		createFramebuffers();
+		createVertexBuffer();
 		createCommandPool();
 		createCommandBuffers();
 		createSyncObjects();
@@ -685,6 +686,50 @@ private:
 		}
 	}
 
+	VkBuffer vertexBuffer = VK_NULL_HANDLE;
+	VkDeviceMemory vertexBufferMemory = VK_NULL_HANDLE;
+
+	uint32_t findMemoryType(uint32_t typeFilter, VkMemoryPropertyFlags propertyFlags){
+		VkPhysicalDeviceMemoryProperties memoryProperties;
+		vkGetPhysicalDeviceMemoryProperties(physicalDevice, &memoryProperties);
+
+		for (uint32_t type = 0; type < memoryProperties.memoryTypeCount; type++){
+			if ((typeFilter & (1 << type)) && (memoryProperties.memoryTypes[type].propertyFlags & propertyFlags)){
+				return type;
+			}
+		}
+
+		throw std::runtime_error("failed to find suitable memory type!");
+	}
+
+	void createVertexBuffer(){
+		VkBufferCreateInfo bufferInfo{};
+		bufferInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
+		bufferInfo.size = vertices.size() * sizeof(Vertex);
+		bufferInfo.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT;
+		bufferInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
+
+		vkCreateBuffer(device, &bufferInfo, nullptr, &vertexBuffer);
+
+		VkMemoryRequirements memoryRequirements;
+		vkGetBufferMemoryRequirements(device, vertexBuffer, &memoryRequirements);
+
+		VkMemoryAllocateInfo allocateInfo {};
+		allocateInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
+		allocateInfo.allocationSize = memoryRequirements.size;
+		allocateInfo.memoryTypeIndex = findMemoryType(memoryRequirements.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
+
+		vkAllocateMemory(device, &allocateInfo, nullptr, &vertexBufferMemory);
+
+		vkBindBufferMemory(device, vertexBuffer, vertexBufferMemory, 0);
+
+		void* data;
+		vkMapMemory(device, vertexBufferMemory, 0, bufferInfo.size, 0, &data);
+		memcpy(data, vertices.data(), bufferInfo.size);
+		vkUnmapMemory(device, vertexBufferMemory);
+	}
+
+
 	VkCommandPool commandPool = VK_NULL_HANDLE;
 
 	std::vector<VkCommandBuffer> commandBuffers;
@@ -746,7 +791,11 @@ private:
 		scissor.extent = swapchainExtent;
 		vkCmdSetScissor(commandBuffer, 0, 1, &scissor);
 
-		vkCmdDraw(commandBuffer, 3, 1, 0, 0);
+		VkBuffer buffers[] = {vertexBuffer};
+		VkDeviceSize offsets[] = {0};
+		vkCmdBindVertexBuffers(commandBuffer, 0, 1, buffers, offsets);
+
+		vkCmdDraw(commandBuffer, vertices.size(), 1, 0, 0);
 
 		vkCmdEndRenderPass(commandBuffer);
 		vkEndCommandBuffer(commandBuffer);
@@ -838,6 +887,8 @@ private:
 	}
 	void cleanup(){
 		cleanupSwapchain();
+		vkDestroyBuffer(device, vertexBuffer, nullptr);
+		vkFreeMemory(device, vertexBufferMemory, nullptr);
 		for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++){
 			vkDestroySemaphore(device, imageAvailableSemaphores[i], nullptr);
 			vkDestroySemaphore(device, renderFinishedSemaphores[i], nullptr);