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Adding a staging buffer.

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Staging buffer makes sure we draw from high speed memory.
We need the extra buffer because highspeed memory is for the gpu is not
accesible to the cpu.
This commit is contained in:
Nigel Barink
2023-11-06 20:50:05 +01:00
parent 73f4ec0ebe
commit 8f7aa2ddf7
1 changed files with 65 additions and 11 deletions
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76
Hello_triangle/main.cpp
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@@ -166,36 +166,90 @@ const std::vector<const char*> deviceExtensions = {
throw std::runtime_error("failed to find suitable memory type!");
}
void createVertexBuffer() {
void CreateBuffer(VkDeviceSize size, VkBufferUsageFlags usage, VkMemoryPropertyFlags properties, VkBuffer& buffer, VkDeviceMemory& buffermemory)
{
VkBufferCreateInfo bufferInfo{};
bufferInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
bufferInfo.size = sizeof(vertices[0]) * vertices.size();
bufferInfo.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT;
bufferInfo.size = size;
bufferInfo.usage = usage;
bufferInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
if (vkCreateBuffer(device, &bufferInfo, nullptr, &vertexBuffer)!= VK_SUCCESS) {
if (vkCreateBuffer(device, &bufferInfo, nullptr, &buffer) != VK_SUCCESS) {
throw std::runtime_error("failed to create vertex buffer!");
}
VkMemoryRequirements memRequirements;
vkGetBufferMemoryRequirements(device, vertexBuffer, &memRequirements);
vkGetBufferMemoryRequirements(device, buffer, &memRequirements);
VkMemoryAllocateInfo allocInfo{};
allocInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
allocInfo.allocationSize = memRequirements.size;
allocInfo.memoryTypeIndex = findMemoryType(memRequirements.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
allocInfo.memoryTypeIndex = findMemoryType(memRequirements.memoryTypeBits, properties);
if (vkAllocateMemory(device, &allocInfo, nullptr, &vertexBufferMemory)!= VK_SUCCESS) {
if (vkAllocateMemory(device, &allocInfo, nullptr, &buffermemory) != VK_SUCCESS) {
throw std::runtime_error("failed to allocate vertex buffer memory!");
}
vkBindBufferMemory(device, vertexBuffer, vertexBufferMemory, 0);
vkBindBufferMemory(device, buffer, buffermemory, 0);
}
// copy from staging to the vertex buffer
void copyBuffer(VkBuffer srcBuffer, VkBuffer dstBuffer, VkDeviceSize size) {
VkCommandBufferAllocateInfo allocInfo{};
allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
allocInfo.commandPool = commandPool;
allocInfo.commandBufferCount = 1;
VkCommandBuffer commandBuffer;
vkAllocateCommandBuffers(device, &allocInfo, &commandBuffer);
VkCommandBufferBeginInfo beginInfo{};
beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
beginInfo.flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;
vkBeginCommandBuffer(commandBuffer, &beginInfo);
VkBufferCopy copyRegion{};
copyRegion.srcOffset = 0; // Optional
copyRegion.dstOffset = 0; // Optional
copyRegion.size = size;
vkCmdCopyBuffer(commandBuffer, srcBuffer, dstBuffer, 1, &copyRegion);
vkEndCommandBuffer(commandBuffer);
VkSubmitInfo submitInfo{};
submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
submitInfo.commandBufferCount = 1;
submitInfo.pCommandBuffers = &commandBuffer;
vkQueueSubmit(graphicsQueue, 1, &submitInfo, VK_NULL_HANDLE);
vkQueueWaitIdle(graphicsQueue);
vkFreeCommandBuffers(device, commandPool, 1, &commandBuffer);
}
// Create a staging and vertex buffer
void createVertexBuffer() {
VkDeviceSize buffersize = sizeof(vertices[0] )* vertices.size();
VkBuffer stagingBuffer;
VkDeviceMemory stagingBufferMemory;
CreateBuffer(buffersize, VK_BUFFER_USAGE_TRANSFER_SRC_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, stagingBuffer, stagingBufferMemory);
void* data;
vkMapMemory(device, vertexBufferMemory, 0, bufferInfo.size, 0, &data);
memcpy(data, vertices.data(), (size_t)bufferInfo.size);
vkUnmapMemory(device, vertexBufferMemory);
vkMapMemory(device, stagingBufferMemory, 0, buffersize, 0, &data);
memcpy(data, vertices.data(), (size_t)buffersize);
vkUnmapMemory(device, stagingBufferMemory);
CreateBuffer(buffersize, VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, vertexBuffer, vertexBufferMemory);
copyBuffer(stagingBuffer, vertexBuffer, buffersize);
vkDestroyBuffer(device, stagingBuffer, nullptr);
vkFreeMemory(device, stagingBufferMemory, nullptr);
}