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/// 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::BufferUsages,
}
/// Order in which TextureData is laid out in memory.
#[derive(Clone, Copy, Default, Debug, PartialEq, Eq, Hash)]
pub enum TextureDataOrder {
/// The texture is laid out densely in memory as:
///
/// ```text
/// Layer0Mip0 Layer0Mip1 Layer0Mip2
/// Layer1Mip0 Layer1Mip1 Layer1Mip2
/// Layer2Mip0 Layer2Mip1 Layer2Mip2
/// ````
///
/// This is the layout used by dds files.
///
/// This was the previous behavior of [`DeviceExt::create_texture_with_data`].
#[default]
LayerMajor,
/// The texture is laid out densely in memory as:
///
/// ```text
/// Layer0Mip0 Layer1Mip0 Layer2Mip0
/// Layer0Mip1 Layer1Mip1 Layer2Mip1
/// Layer0Mip2 Layer1Mip2 Layer2Mip2
/// ```
///
/// This is the layout used by ktx and ktx2 files.
MipMajor,
}
/// 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.
///
/// See [`TextureDataOrder`] for the order in which the data is laid out in memory.
///
/// Implicitly adds the `COPY_DST` usage if it is not present in the descriptor,
/// as it is required to be able to upload the data to the gpu.
fn create_texture_with_data(
&self,
queue: &crate::Queue,
desc: &crate::TextureDescriptor<'_>,
order: TextureDataOrder,
data: &[u8],
) -> crate::Texture;
}
impl DeviceExt for crate::Device {
fn create_buffer_init(&self, descriptor: &BufferInitDescriptor<'_>) -> crate::Buffer {
// Skip mapping if the buffer is zero sized
if descriptor.contents.is_empty() {
let wgt_descriptor = crate::BufferDescriptor {
label: descriptor.label,
size: 0,
usage: descriptor.usage,
mapped_at_creation: false,
};
self.create_buffer(&wgt_descriptor)
} else {
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(..).get_mapped_range_mut()[..unpadded_size as usize]
.copy_from_slice(descriptor.contents);
buffer.unmap();
buffer
}
}
fn create_texture_with_data(
&self,
queue: &crate::Queue,
desc: &crate::TextureDescriptor<'_>,
order: TextureDataOrder,
data: &[u8],
) -> crate::Texture {
// Implicitly add the COPY_DST usage
let mut desc = desc.to_owned();
desc.usage |= crate::TextureUsages::COPY_DST;
let texture = self.create_texture(&desc);
// Will return None only if it's a combined depth-stencil format
// If so, default to 4, validation will fail later anyway since the depth or stencil
// aspect needs to be written to individually
let block_size = desc.format.block_copy_size(None).unwrap_or(4);
let (block_width, block_height) = desc.format.block_dimensions();
let layer_iterations = desc.array_layer_count();
let outer_iteration;
let inner_iteration;
match order {
TextureDataOrder::LayerMajor => {
outer_iteration = layer_iterations;
inner_iteration = desc.mip_level_count;
}
TextureDataOrder::MipMajor => {
outer_iteration = desc.mip_level_count;
inner_iteration = layer_iterations;
}
}
let mut binary_offset = 0;
for outer in 0..outer_iteration {
for inner in 0..inner_iteration {
let (layer, mip) = match order {
TextureDataOrder::LayerMajor => (outer, inner),
TextureDataOrder::MipMajor => (inner, outer),
};
let mut mip_size = desc.mip_level_size(mip).unwrap();
// copying layers separately
if desc.dimension != wgt::TextureDimension::D3 {
mip_size.depth_or_array_layers = 1;
}
// 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 / block_width;
let height_blocks = mip_physical.height / block_height;
let bytes_per_row = width_blocks * block_size;
let data_size = bytes_per_row * height_blocks * mip_size.depth_or_array_layers;
let end_offset = binary_offset + data_size as usize;
queue.write_texture(
crate::ImageCopyTexture {
texture: &texture,
mip_level: mip,
origin: crate::Origin3d {
x: 0,
y: 0,
z: layer,
},
aspect: wgt::TextureAspect::All,
},
&data[binary_offset..end_offset],
crate::ImageDataLayout {
offset: 0,
bytes_per_row: Some(bytes_per_row),
rows_per_image: Some(height_blocks),
},
mip_physical,
);
binary_offset = end_offset;
}
}
texture
}
}