// Prepare and initialize uniform buffer containing shader uniforms
void prepareUniformBuffers()
{
// Phong and color pass vertex shader uniform buffer
vulkanDevice.createBuffer(
VkBufferUsageFlagBits.UniformBuffer,
VkMemoryPropertyFlagBits.HostVisible | VkMemoryPropertyFlagBits.HostCoherent,
uniformBufferScene,
(ulong)sizeof(UboVS));
// Fullscreen radial blur parameters
var blurParamsLocal = uboBlurParams;
vulkanDevice.createBuffer(
VkBufferUsageFlagBits.UniformBuffer,
VkMemoryPropertyFlagBits.HostVisible | VkMemoryPropertyFlagBits.HostCoherent,
uniformBufferBlurParams,
(ulong)sizeof(UboBlurParams),
&blurParamsLocal);
// Map persistent
uniformBufferScene.map();
uniformBufferBlurParams.map();
updateUniformBuffersScene();
}
/**
* Create a buffer on the device
*
* @param usageFlags Usage flag bitmask for the buffer (i.e. index, vertex, uniform buffer)
* @param memoryPropertyFlags Memory properties for this buffer (i.e. device local, host visible, coherent)
* @param buffer Pointer to a vk::Vulkan buffer object
* @param size Size of the buffer in byes
* @param data Pointer to the data that should be copied to the buffer after creation (optional, if not set, no data is copied over)
*
* @return Success if buffer handle and memory have been created and (optionally passed) data has been copied
*/
public VkResult createBuffer(VkBufferUsageFlagBits usageFlags, VkMemoryPropertyFlagBits memoryPropertyFlags, vksBuffer buffer, ulong size, void *data = null)
{
buffer.device = _logicalDevice;
// Create the buffer handle
VkBufferCreateInfo bufferCreateInfo = new VkBufferCreateInfo();
bufferCreateInfo.sType = BufferCreateInfo;
bufferCreateInfo.usage = usageFlags;
bufferCreateInfo.size = size;
{
VkBuffer vkBuffer;
vkCreateBuffer(_logicalDevice, &bufferCreateInfo, null, &vkBuffer);
buffer.buffer = vkBuffer;
}
// Create the memory backing up the buffer handle
VkMemoryRequirements memReqs;
VkMemoryAllocateInfo memAlloc = new VkMemoryAllocateInfo();
memAlloc.sType = MemoryAllocateInfo;
vkGetBufferMemoryRequirements(_logicalDevice, buffer.buffer, &memReqs);
memAlloc.allocationSize = memReqs.size;
// Find a memory type index that fits the properties of the buffer
memAlloc.memoryTypeIndex = getMemoryType(memReqs.memoryTypeBits, memoryPropertyFlags);
{
VkDeviceMemory memory;
vkAllocateMemory(_logicalDevice, &memAlloc, null, &memory);
buffer.memory = memory;
}
buffer.alignment = memReqs.alignment;
buffer.size = memAlloc.allocationSize;
buffer.usageFlags = usageFlags;
buffer.memoryPropertyFlags = memoryPropertyFlags;
// If a pointer to the buffer data has been passed, map the buffer and copy over the data
if (data != null)
{
buffer.map();
Unsafe.CopyBlock(buffer.mapped, data, (uint)size);
buffer.unmap();
}
// Initialize a default descriptor that covers the whole buffer size
buffer.setupDescriptor();
// Attach the memory to the buffer object
return(buffer.bind());
}