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use crate::core::texture::*;
///
/// A 2D texture, basically an image that is transferred to the GPU.
///
pub struct Texture2D {
context: Context,
id: crate::context::Texture,
width: u32,
height: u32,
number_of_mip_maps: u32,
data_byte_size: usize,
}
impl Texture2D {
///
/// Construcs a new texture with the given data.
///
/// **Note:** Mip maps will not be generated for RGB16F and RGB32F format, even if `mip_map_filter` is specified.
///
pub fn new(context: &Context, cpu_texture: &CpuTexture) -> Self {
match cpu_texture.data {
TextureData::RU8(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RgU8(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RgbU8(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RgbaU8(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RF16(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RgF16(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RgbF16(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RgbaF16(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RF32(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RgF32(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RgbF32(ref data) => Self::new_with_data(context, cpu_texture, data),
TextureData::RgbaF32(ref data) => Self::new_with_data(context, cpu_texture, data),
}
}
fn new_with_data<T: TextureDataType>(
context: &Context,
cpu_texture: &CpuTexture,
data: &[T],
) -> Self {
let texture = Self::new_empty::<T>(
context,
cpu_texture.width,
cpu_texture.height,
cpu_texture.min_filter,
cpu_texture.mag_filter,
cpu_texture.mipmap,
cpu_texture.wrap_s,
cpu_texture.wrap_t,
);
texture.fill(data);
texture
}
///
/// Constructs a new empty 2D texture with the given parameters.
/// The format is determined by the generic [TextureDataType] parameter
/// (for example, if [u8; 4] is specified, the format is RGBA and the data type is byte).
///
/// **Note:** Mip maps will not be generated for RGB16F and RGB32F format, even if `mip_map_filter` is specified.
///
pub fn new_empty<T: TextureDataType>(
context: &Context,
width: u32,
height: u32,
min_filter: Interpolation,
mag_filter: Interpolation,
mipmap: Option<Mipmap>,
wrap_s: Wrapping,
wrap_t: Wrapping,
) -> Self {
unsafe {
Self::new_unchecked::<T>(
context,
width,
height,
min_filter,
mag_filter,
mipmap,
wrap_s,
wrap_t,
|texture| {
context.tex_storage_2d(
crate::context::TEXTURE_2D,
texture.number_of_mip_maps() as i32,
T::internal_format(),
width as i32,
height as i32,
);
},
)
}
}
///
/// Fills this texture with the given data and generate mip maps if specified at construction.
///
/// # Panic
/// Will panic if the length of 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<T: TextureDataType>(&self, data: &[T]) {
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_2d(
crate::context::TEXTURE_2D,
0,
0,
0,
self.width as i32,
self.height as i32,
format_from_data_type::<T>(),
T::data_type(),
crate::context::PixelUnpackData::Slice(Some(to_byte_slice(&data))),
);
}
self.generate_mip_maps();
}
///
/// Returns a [ColorTarget] which can be used to clear, write to and read from the given 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(&self, mip_level: Option<u32>) -> ColorTarget<'_> {
ColorTarget::new_texture2d(&self.context, self, 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 mip maps of this texture.
pub fn number_of_mip_maps(&self) -> u32 {
self.number_of_mip_maps
}
pub(crate) fn generate_mip_maps(&self) {
if self.number_of_mip_maps > 1 {
self.bind();
unsafe {
self.context.generate_mipmap(crate::context::TEXTURE_2D);
}
}
}
pub(in crate::core) fn bind_as_color_target(&self, channel: u32, mip_level: u32) {
unsafe {
self.context.framebuffer_texture_2d(
crate::context::FRAMEBUFFER,
crate::context::COLOR_ATTACHMENT0 + channel,
crate::context::TEXTURE_2D,
Some(self.id),
mip_level as i32,
);
}
}
pub(in crate::core) fn bind(&self) {
unsafe {
self.context
.bind_texture(crate::context::TEXTURE_2D, Some(self.id));
}
}
///
/// Creates a new texture where it is up to the caller to allocate and transfer data to the GPU
/// using low-level context calls inside the callback.
/// This function binds the texture and sets the parameters before calling the callback and generates mip maps afterwards.
///
/// # Safety
///
/// This function is unsafe and should only be used in special cases,
/// for example when you have an uncommon source of data or the data is in a special format like sRGB.
///
pub unsafe fn new_unchecked<T: TextureDataType>(
context: &Context,
width: u32,
height: u32,
min_filter: Interpolation,
mag_filter: Interpolation,
mipmap: Option<Mipmap>,
wrap_s: Wrapping,
wrap_t: Wrapping,
callback: impl FnOnce(&Self),
) -> Self {
let id = generate(context);
let number_of_mip_maps = calculate_number_of_mip_maps::<T>(mipmap, width, height, None);
let texture = Self {
context: context.clone(),
id,
width,
height,
number_of_mip_maps,
data_byte_size: std::mem::size_of::<T>(),
};
texture.bind();
set_parameters(
context,
crate::context::TEXTURE_2D,
min_filter,
mag_filter,
if number_of_mip_maps == 1 {
None
} else {
mipmap
},
wrap_s,
wrap_t,
None,
);
callback(&texture);
texture.generate_mip_maps();
texture
}
}
impl Drop for Texture2D {
fn drop(&mut self) {
unsafe {
self.context.delete_texture(self.id);
}
}
}