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use crate::core::texture::*;
///
/// A array of 2D color textures that can be rendered into.
///
/// **Note:** [DepthTest] is disabled if not also writing to a [DepthTarget].
/// Use a [RenderTarget] to write to both color and depth.
///
pub struct Texture2DArray {
context: Context,
id: crate::context::Texture,
width: u32,
height: u32,
depth: u32,
number_of_mip_maps: u32,
data_byte_size: usize,
}
impl Texture2DArray {
///
/// Creates a new texture array from the given [CpuTexture]s.
/// All of the cpu textures must contain data with the same [TextureDataType] and the same width and height.
///
pub fn new(context: &Context, cpu_textures: &[&CpuTexture]) -> Self {
let cpu_texture = cpu_textures
.get(0)
.expect("Expect at least one texture in a texture array");
match &cpu_texture.data {
TextureData::RU8(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures.iter().map(|t| ru8_data(t)).collect::<Vec<_>>(),
),
TextureData::RgU8(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rgu8_data(t))
.collect::<Vec<_>>(),
),
TextureData::RgbU8(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rgbu8_data(t))
.collect::<Vec<_>>(),
),
TextureData::RgbaU8(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rgbau8_data(t))
.collect::<Vec<_>>(),
),
TextureData::RF16(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rf16_data(t))
.collect::<Vec<_>>(),
),
TextureData::RgF16(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rgf16_data(t))
.collect::<Vec<_>>(),
),
TextureData::RgbF16(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rgbf16_data(t))
.collect::<Vec<_>>(),
),
TextureData::RgbaF16(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rgbaf16_data(t))
.collect::<Vec<_>>(),
),
TextureData::RF32(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rf32_data(t))
.collect::<Vec<_>>(),
),
TextureData::RgF32(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rgf32_data(t))
.collect::<Vec<_>>(),
),
TextureData::RgbF32(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rgbf32_data(t))
.collect::<Vec<_>>(),
),
TextureData::RgbaF32(_) => Self::new_with_data(
context,
cpu_texture,
&cpu_textures
.iter()
.map(|t| rgbaf32_data(t))
.collect::<Vec<_>>(),
),
}
}
fn new_with_data<T: TextureDataType>(
context: &Context,
cpu_texture: &CpuTexture,
data: &[&[T]],
) -> Self {
let mut texture = Self::new_empty::<T>(
context,
cpu_texture.width,
cpu_texture.height,
data.len() as u32,
cpu_texture.min_filter,
cpu_texture.mag_filter,
cpu_texture.mip_map_filter,
cpu_texture.wrap_s,
cpu_texture.wrap_t,
);
texture.fill(data);
texture
}
///
/// Creates a new array of 2D textures.
///
pub fn new_empty<T: TextureDataType>(
context: &Context,
width: u32,
height: u32,
depth: u32,
min_filter: Interpolation,
mag_filter: Interpolation,
mip_map_filter: Option<Interpolation>,
wrap_s: Wrapping,
wrap_t: Wrapping,
) -> Self {
let id = generate(context);
let number_of_mip_maps = calculate_number_of_mip_maps(mip_map_filter, width, height, None);
let texture = Self {
context: context.clone(),
id,
width,
height,
depth,
number_of_mip_maps,
data_byte_size: std::mem::size_of::<T>(),
};
texture.bind();
set_parameters(
context,
crate::context::TEXTURE_2D_ARRAY,
min_filter,
mag_filter,
if number_of_mip_maps == 1 {
None
} else {
mip_map_filter
},
wrap_s,
wrap_t,
None,
);
unsafe {
context.tex_storage_3d(
crate::context::TEXTURE_2D_ARRAY,
number_of_mip_maps as i32,
T::internal_format(),
width as i32,
height as i32,
depth as i32,
);
}
texture.generate_mip_maps();
texture
}
///
/// Fills the texture array with the given pixel data.
///
/// # Panic
/// Will panic if the data does not correspond to the width, height, depth and format specified at construction.
/// It is therefore necessary to create a new texture if the texture size or format has changed.
///
pub fn fill<T: TextureDataType>(&mut self, data: &[&[T]]) {
for (i, data) in data.iter().enumerate() {
self.fill_layer(i as u32, data);
}
}
///
/// Fills the given layer in the texture array with the given pixel data.
///
/// # Panic
/// Will panic if the layer number is bigger than the number of layers or if the data does not correspond to the width, height and format specified at construction.
/// It is therefore necessary to create a new texture if the texture size or format has changed.
///
pub fn fill_layer<T: TextureDataType>(&mut self, layer: u32, data: &[T]) {
if layer >= self.depth {
panic!(
"cannot fill the layer {} with data, since there are only {} layers in the texture array",
layer, self.depth
)
}
check_data_length::<T>(self.width, self.height, 1, self.data_byte_size, data.len());
self.bind();
let mut data = (*data).to_owned();
flip_y(&mut data, self.width as usize, self.height as usize);
unsafe {
self.context.tex_sub_image_3d(
crate::context::TEXTURE_2D_ARRAY,
0,
0,
0,
layer as i32,
self.width as i32,
self.height as i32,
1,
format_from_data_type::<T>(),
T::data_type(),
crate::context::PixelUnpackData::Slice(to_byte_slice(&data)),
);
}
self.generate_mip_maps();
}
///
/// Returns a [ColorTarget] which can be used to clear, write to and read from the given layers and mip level of this texture.
/// Combine this together with a [DepthTarget] with [RenderTarget::new] to be able to write to both a depth and color target at the same time.
/// If `None` is specified as the mip level, the 0 level mip level is used and mip maps are generated after a write operation if a mip map filter is specified.
/// Otherwise, the given mip level is used and no mip maps are generated.
///
/// **Note:** [DepthTest] is disabled if not also writing to a depth texture.
///
pub fn as_color_target<'a>(
&'a mut self,
layers: &'a [u32],
mip_level: Option<u32>,
) -> ColorTarget<'a> {
ColorTarget::new_texture_2d_array(&self.context, self, layers, mip_level)
}
/// The width of this texture.
pub fn width(&self) -> u32 {
self.width
}
/// The height of this texture.
pub fn height(&self) -> u32 {
self.height
}
/// The number of layers.
pub fn depth(&self) -> u32 {
self.depth
}
pub(in crate::core) fn generate_mip_maps(&self) {
if self.number_of_mip_maps > 1 {
self.bind();
unsafe {
self.context
.generate_mipmap(crate::context::TEXTURE_2D_ARRAY);
}
}
}
pub(in crate::core) fn bind_as_color_target(&self, layer: u32, channel: u32, mip_level: u32) {
unsafe {
self.context.framebuffer_texture_layer(
crate::context::DRAW_FRAMEBUFFER,
crate::context::COLOR_ATTACHMENT0 + channel,
Some(self.id),
mip_level as i32,
layer as i32,
);
}
}
pub(in crate::core) fn bind(&self) {
unsafe {
self.context
.bind_texture(crate::context::TEXTURE_2D_ARRAY, Some(self.id));
}
}
}
impl Drop for Texture2DArray {
fn drop(&mut self) {
unsafe {
self.context.delete_texture(self.id);
}
}
}