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less copies for buffer init

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PancakeTAS 2025-06-29 22:43:54 +02:00
parent f724229ae4
commit 80f27ad188
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3 changed files with 13 additions and 15 deletions
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13
include/core/buffer.hpp
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@ -5,7 +5,6 @@
#include <vulkan/vulkan_core.h>
#include <vector>
#include <memory>
namespace Vulkan::Core {
@ -21,14 +20,16 @@ namespace Vulkan::Core {
/// Create the buffer.
///
/// @param device Vulkan device
/// @param size Size of the buffer in bytes.
/// @param data Initial data for the buffer.
/// @param data Initial data for the buffer, also specifies the size of the buffer.
/// @param usage Usage flags for the buffer
///
/// @throws ls::vulkan_error if object creation fails.
///
Buffer(const Device& device, size_t size, std::vector<uint8_t> data,
VkBufferUsageFlags usage);
template<typename T>
Buffer(const Device& device, const T& data, VkBufferUsageFlags usage)
: size(sizeof(T)) {
construct(device, reinterpret_cast<const void*>(&data), usage);
}
/// Get the Vulkan handle.
[[nodiscard]] auto handle() const { return *this->buffer; }
@ -42,6 +43,8 @@ namespace Vulkan::Core {
Buffer& operator=(Buffer&&) noexcept = default;
~Buffer() = default;
private:
void construct(const Device& device, const void* data, VkBufferUsageFlags usage);
std::shared_ptr<VkBuffer> buffer;
std::shared_ptr<VkDeviceMemory> memory;

9
src/core/buffer.cpp
View file

@ -6,12 +6,11 @@
using namespace Vulkan::Core;
Buffer::Buffer(const Device& device, size_t size, std::vector<uint8_t> data,
VkBufferUsageFlags usage) : size(size) {
void Buffer::construct(const Device& device, const void* data, VkBufferUsageFlags usage) {
// create buffer
const VkBufferCreateInfo desc{
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.size = size,
.size = this->size,
.usage = usage,
.sharingMode = VK_SHARING_MODE_EXCLUSIVE
};
@ -59,10 +58,10 @@ Buffer::Buffer(const Device& device, size_t size, std::vector<uint8_t> data,
// upload data to buffer
uint8_t* buf{};
res = vkMapMemory(device.handle(), memoryHandle, 0, size, 0, reinterpret_cast<void**>(&buf));
res = vkMapMemory(device.handle(), memoryHandle, 0, this->size, 0, reinterpret_cast<void**>(&buf));
if (res != VK_SUCCESS || buf == nullptr)
throw ls::vulkan_error(res, "Failed to map memory for Vulkan buffer");
std::copy_n(data.data(), std::min(size, data.size()), buf);
std::copy_n(reinterpret_cast<const uint8_t*>(data), this->size, buf);
vkUnmapMemory(device.handle(), memoryHandle);
// store buffer and memory in shared ptr

6
src/main.cpp
View file

@ -62,11 +62,7 @@ int main() {
VK_IMAGE_ASPECT_COLOR_BIT
));
const auto* dataBuffer = reinterpret_cast<const uint8_t*>(&data);
std::vector<uint8_t> dataVec(sizeof(DataBuffer));
std::copy_n(dataBuffer, sizeof(DataBuffer), dataVec.data());
const Core::Buffer buffer(device, dataVec.size(), dataVec,
VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT);
const Core::Buffer buffer(device, data, VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT);
std::vector<Core::Image> outputImages;
outputImages.reserve(7);