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use std::{convert::TryFrom, num::NonZeroU32};
/// Describes a [Buffer](crate::Buffer) when allocating.
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct BufferInitDescriptor<'a> {
/// Debug label of a buffer. This will show up in graphics debuggers for easy identification.
pub label: crate::Label<'a>,
/// Contents of a buffer on creation.
pub contents: &'a [u8],
/// Usages of a buffer. If the buffer is used in any way that isn't specified here, the operation
/// will panic.
pub usage: crate::BufferUsage,
}
/// Utility methods not meant to be in the main API.
pub trait DeviceExt {
/// Creates a [Buffer](crate::Buffer) with data to initialize it.
fn create_buffer_init(&self, desc: &BufferInitDescriptor) -> crate::Buffer;
/// Upload an entire texture and its mipmaps from a source buffer.
///
/// Expects all mipmaps to be tightly packed in the data buffer.
///
/// If the texture is a 2DArray texture, uploads each layer in order, expecting
/// each layer and its mips to be tightly packed.
///
/// Example:
/// Layer0Mip0 Layer0Mip1 Layer0Mip2 ... Layer1Mip0 Layer1Mip1 Layer1Mip2 ...
fn create_texture_with_data(
&self,
queue: &crate::Queue,
desc: &crate::TextureDescriptor,
data: &[u8],
) -> crate::Texture;
}
impl DeviceExt for crate::Device {
fn create_buffer_init(&self, descriptor: &BufferInitDescriptor<'_>) -> crate::Buffer {
let unpadded_size = descriptor.contents.len() as crate::BufferAddress;
// Valid vulkan usage is
// 1. buffer size must be a multiple of COPY_BUFFER_ALIGNMENT.
// 2. buffer size must be greater than 0.
// Therefore we round the value up to the nearest multiple, and ensure it's at least COPY_BUFFER_ALIGNMENT.
let align_mask = crate::COPY_BUFFER_ALIGNMENT - 1;
let padded_size =
((unpadded_size + align_mask) & !align_mask).max(crate::COPY_BUFFER_ALIGNMENT);
let wgt_descriptor = crate::BufferDescriptor {
label: descriptor.label,
size: padded_size,
usage: descriptor.usage,
mapped_at_creation: true,
};
let buffer = self.create_buffer(&wgt_descriptor);
buffer
.slice(..unpadded_size)
.get_mapped_range_mut()
.copy_from_slice(descriptor.contents);
buffer.unmap();
buffer
}
fn create_texture_with_data(
&self,
queue: &crate::Queue,
desc: &crate::TextureDescriptor,
data: &[u8],
) -> crate::Texture {
let texture = self.create_texture(desc);
let format_info = desc.format.describe();
let (layer_iterations, mip_extent) = if desc.dimension == crate::TextureDimension::D3 {
(1, desc.size)
} else {
(
desc.size.depth_or_array_layers,
crate::Extent3d {
depth_or_array_layers: 1,
..desc.size
},
)
};
let mip_level_count =
u8::try_from(desc.mip_level_count).expect("mip level count overflows a u8");
let mut binary_offset = 0;
for layer in 0..layer_iterations {
for mip in 0..mip_level_count {
let mip_size = mip_extent.at_mip_level(mip).unwrap();
// When uploading mips of compressed textures and the mip is supposed to be
// a size that isn't a multiple of the block size, the mip needs to be uploaded
// as its "physical size" which is the size rounded up to the nearest block size.
let mip_physical = mip_size.physical_size(desc.format);
// All these calculations are performed on the physical size as that's the
// data that exists in the buffer.
let width_blocks = mip_physical.width / format_info.block_dimensions.0 as u32;
let height_blocks = mip_physical.height / format_info.block_dimensions.1 as u32;
let bytes_per_row = width_blocks * format_info.block_size as u32;
let data_size = bytes_per_row * height_blocks * mip_extent.depth_or_array_layers;
let end_offset = binary_offset + data_size as usize;
queue.write_texture(
crate::ImageCopyTexture {
texture: &texture,
mip_level: mip as u32,
origin: crate::Origin3d {
x: 0,
y: 0,
z: layer,
},
},
&data[binary_offset..end_offset],
crate::ImageDataLayout {
offset: 0,
bytes_per_row: Some(
NonZeroU32::new(bytes_per_row).expect("invalid bytes per row"),
),
rows_per_image: Some(
NonZeroU32::new(mip_physical.height).expect("invalid height"),
),
},
mip_physical,
);
binary_offset = end_offset;
}
}
texture
}
}