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use std::fmt::Display;
use std::path::Path;
use std::sync::atomic::{AtomicU32, Ordering};
use image::io::Reader as ImageReader;
use image::{DynamicImage, ImageError, Rgb, RgbImage};
use crate::color::Color;
use crate::data_types::dimens::Dimens;
use crate::opengl::texture::PixelDataFormat;
use crate::util::builder;
static NEXT_ID: AtomicU32 = AtomicU32::new(0);
mod reexports
{
pub use crate::opengl::texture::{Filtering, Wrapping};
}
pub use reexports::*;
#[derive(Debug, Clone)]
pub struct Texture
{
id: Id,
image: DynamicImage,
pixel_data_format: PixelDataFormat,
dimensions: Dimens<u32>,
properties: Properties,
}
impl Texture
{
pub fn builder() -> Builder
{
Builder::default()
}
/// Opens a texture image.
///
/// # Errors
/// Will return `Err` if:
/// - Opening the image fails
/// - The image data is not 8-bit/color RGB
pub fn open(path: &Path) -> Result<Self, Error>
{
Self::builder().open(path)
}
#[must_use]
pub fn new_from_color(dimensions: &Dimens<u32>, color: &Color<u8>) -> Self
{
Self::builder().build_with_single_color(dimensions, color)
}
#[must_use]
pub fn id(&self) -> Id
{
self.id
}
#[must_use]
pub fn properties(&self) -> &Properties
{
&self.properties
}
pub fn properties_mut(&mut self) -> &mut Properties
{
&mut self.properties
}
#[must_use]
pub fn dimensions(&self) -> &Dimens<u32>
{
&self.dimensions
}
#[must_use]
pub fn pixel_data_format(&self) -> PixelDataFormat
{
self.pixel_data_format
}
#[must_use]
pub fn image(&self) -> &DynamicImage
{
&self.image
}
}
impl Drop for Texture
{
fn drop(&mut self)
{
NEXT_ID.fetch_sub(1, Ordering::Relaxed);
}
}
/// Texture builder.
#[derive(Debug, Default, Clone)]
pub struct Builder
{
properties: Properties,
}
impl Builder
{
pub fn properties(mut self, properties: Properties) -> Self
{
self.properties = properties;
self
}
/// Opens a image as a texture.
///
/// # Errors
/// Will return `Err` if:
/// - Opening the image fails
/// - Decoding the image fails
/// - The image data is in a unsupported format
pub fn open(&self, path: &(impl AsRef<Path> + ?Sized)) -> Result<Texture, Error>
{
let image = ImageReader::open(path)
.map_err(Error::OpenImageFailed)?
.decode()
.map_err(Error::DecodeImageFailed)?;
let pixel_data_format = match &image {
DynamicImage::ImageRgb8(_) => PixelDataFormat::Rgb8,
DynamicImage::ImageRgba8(_) => PixelDataFormat::Rgba8,
_ => {
return Err(Error::UnsupportedImageDataFormat);
}
};
let dimensions = Dimens {
width: image.width(),
height: image.height(),
};
let id = NEXT_ID.fetch_add(1, Ordering::Relaxed);
Ok(Texture {
id: Id::new(id),
image,
pixel_data_format,
dimensions,
properties: self.properties.clone(),
})
}
#[must_use]
pub fn build_with_single_color(
&self,
dimensions: &Dimens<u32>,
color: &Color<u8>,
) -> Texture
{
let image = RgbImage::from_pixel(
dimensions.width,
dimensions.height,
Rgb([color.red, color.green, color.blue]),
);
let id = NEXT_ID.fetch_add(1, Ordering::Relaxed);
Texture {
id: Id::new(id),
image: image.into(),
pixel_data_format: PixelDataFormat::Rgb8,
dimensions: *dimensions,
properties: self.properties.clone(),
}
}
}
/// Texture error.
#[derive(Debug, thiserror::Error)]
pub enum Error
{
#[error("Failed to open texture image")]
OpenImageFailed(#[source] std::io::Error),
#[error("Failed to decode texture image")]
DecodeImageFailed(#[source] ImageError),
#[error("Unsupported image data format")]
UnsupportedImageDataFormat,
}
builder! {
/// Texture properties
#[builder(name = PropertiesBuilder, derives=(Debug, Clone))]
#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct Properties
{
pub wrap: Wrapping,
pub magnifying_filter: Filtering,
pub minifying_filter: Filtering,
}
}
impl Properties
{
pub fn builder() -> PropertiesBuilder
{
PropertiesBuilder::default()
}
}
impl Default for Properties
{
fn default() -> Self
{
Self {
wrap: Wrapping::Repeat,
magnifying_filter: Filtering::Linear,
minifying_filter: Filtering::Nearest,
}
}
}
impl Default for PropertiesBuilder
{
fn default() -> Self
{
Properties::default().into()
}
}
/// Texture ID.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Id
{
id: u32,
}
impl Id
{
fn new(id: u32) -> Self
{
Self { id }
}
}
impl Display for Id
{
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
self.id.fmt(formatter)
}
}
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