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|
use crate::data_types::dimens::Dimens;
use crate::texture::Properties;
#[derive(Debug)]
pub struct Texture
{
texture: gl::types::GLuint,
}
impl Texture
{
pub fn new() -> Self
{
let mut texture = gl::types::GLuint::default();
unsafe {
gl::CreateTextures(gl::TEXTURE_2D, 1, &mut texture);
};
Self { texture }
}
pub fn bind(&self)
{
unsafe {
gl::BindTexture(gl::TEXTURE_2D, self.texture);
}
}
pub fn generate(
&mut self,
dimens: Dimens<u32>,
data: &[u8],
pixel_data_format: PixelDataFormat,
)
{
self.alloc_image(pixel_data_format, dimens, data);
unsafe {
gl::GenerateTextureMipmap(self.texture);
}
}
pub fn apply_properties(&mut self, properties: &Properties)
{
self.set_wrap(properties.wrap);
self.set_magnifying_filter(properties.magnifying_filter);
self.set_minifying_filter(properties.minifying_filter);
}
pub fn set_wrap(&mut self, wrapping: Wrapping)
{
let wrapping_gl = wrapping.to_gl();
#[allow(clippy::cast_possible_wrap)]
unsafe {
gl::TextureParameteri(self.texture, gl::TEXTURE_WRAP_S, wrapping_gl as i32);
gl::TextureParameteri(self.texture, gl::TEXTURE_WRAP_T, wrapping_gl as i32);
}
}
pub fn set_magnifying_filter(&mut self, filtering: Filtering)
{
let filtering_gl = filtering.to_gl();
#[allow(clippy::cast_possible_wrap)]
unsafe {
gl::TextureParameteri(
self.texture,
gl::TEXTURE_MAG_FILTER,
filtering_gl as i32,
);
}
}
pub fn set_minifying_filter(&mut self, filtering: Filtering)
{
let filtering_gl = filtering.to_gl();
#[allow(clippy::cast_possible_wrap)]
unsafe {
gl::TextureParameteri(
self.texture,
gl::TEXTURE_MIN_FILTER,
filtering_gl as i32,
);
}
}
fn alloc_image(
&mut self,
pixel_data_format: PixelDataFormat,
dimens: Dimens<u32>,
data: &[u8],
)
{
unsafe {
#[allow(clippy::cast_possible_wrap)]
gl::TextureStorage2D(
self.texture,
1,
pixel_data_format.to_sized_internal_format(),
dimens.width as i32,
dimens.height as i32,
);
#[allow(clippy::cast_possible_wrap)]
gl::TextureSubImage2D(
self.texture,
0,
0,
0,
dimens.width as i32,
dimens.height as i32,
pixel_data_format.to_format(),
gl::UNSIGNED_BYTE,
data.as_ptr().cast(),
);
}
}
}
impl Drop for Texture
{
fn drop(&mut self)
{
unsafe {
gl::DeleteTextures(1, &self.texture);
}
}
}
/// Texture wrapping.
#[derive(Debug, Clone, Copy)]
pub enum Wrapping
{
Repeat,
MirroredRepeat,
ClampToEdge,
ClampToBorder,
}
impl Wrapping
{
fn to_gl(self) -> gl::types::GLenum
{
match self {
Self::Repeat => gl::REPEAT,
Self::MirroredRepeat => gl::MIRRORED_REPEAT,
Self::ClampToEdge => gl::CLAMP_TO_EDGE,
Self::ClampToBorder => gl::CLAMP_TO_BORDER,
}
}
}
#[derive(Debug, Clone, Copy)]
pub enum Filtering
{
Nearest,
Linear,
}
impl Filtering
{
fn to_gl(self) -> gl::types::GLenum
{
match self {
Self::Linear => gl::LINEAR,
Self::Nearest => gl::NEAREST,
}
}
}
/// Texture pixel data format.
#[derive(Debug, Clone, Copy)]
pub enum PixelDataFormat
{
Rgb8,
Rgba8,
}
impl PixelDataFormat
{
fn to_sized_internal_format(self) -> gl::types::GLenum
{
match self {
Self::Rgb8 => gl::RGB8,
Self::Rgba8 => gl::RGBA8,
}
}
fn to_format(self) -> gl::types::GLenum
{
match self {
Self::Rgb8 => gl::RGB,
Self::Rgba8 => gl::RGBA,
}
}
}
pub fn set_active_texture_unit(texture_unit: TextureUnit)
{
unsafe {
gl::ActiveTexture(texture_unit.into_gl());
}
}
macro_rules! texture_unit_enum {
(cnt=$cnt: literal) => {
seq_macro::seq!(N in 0..$cnt {
#[derive(Debug, Clone, Copy)]
pub enum TextureUnit {
#(
No~N,
)*
}
impl TextureUnit {
fn into_gl(self) -> gl::types::GLenum {
match self {
#(
Self::No~N => gl::TEXTURE~N,
)*
}
}
pub fn from_num(num: usize) -> Option<Self> {
match num {
#(
N => Some(Self::No~N),
)*
_ => None
}
}
}
});
};
}
texture_unit_enum!(cnt = 31);
|
