74 lines
1.7 KiB
Rust
74 lines
1.7 KiB
Rust
use std::convert::TryInto;
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use std::ffi::c_void;
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use std::fs::File;
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use std::path::Path;
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pub struct Texture {
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id: u32,
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}
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impl Texture {
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pub fn from_file <P> (name: P) -> Texture
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where P: AsRef <Path>
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{
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let decoder = png::Decoder::new (File::open (name).unwrap ());
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let (info, mut reader) = decoder.read_info ().unwrap ();
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// Allocate the output buffer.
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let mut buf = vec! [0; info.buffer_size ()];
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// Read the next frame. Currently this function should only called once.
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// The default options
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reader.next_frame (&mut buf).unwrap ();
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let id = unsafe {
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let mut id = 0;
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gl::GenTextures (1, &mut id);
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assert! (id != 0);
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let width = info.width.try_into ().unwrap ();
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let height = info.height.try_into ().unwrap ();
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let format = match info.color_type {
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png::ColorType::RGB => gl::RGB,
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png::ColorType::RGBA => gl::RGBA,
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_ => panic! ("ColorType not implemented"),
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};
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gl::BindTexture (gl::TEXTURE_2D, id);
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gl::TexImage2D (gl::TEXTURE_2D, 0, format.try_into ().unwrap (), width, height, 0, format, gl::UNSIGNED_BYTE, &buf [0] as *const u8 as *const c_void);
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gl::TexParameteri (gl::TEXTURE_2D, gl::TEXTURE_WRAP_S, gl::CLAMP_TO_EDGE as i32);
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gl::TexParameteri (gl::TEXTURE_2D, gl::TEXTURE_WRAP_T, gl::CLAMP_TO_EDGE as i32);
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gl::TexParameteri (gl::TEXTURE_2D, gl::TEXTURE_MIN_FILTER, gl::NEAREST as i32);
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gl::TexParameteri (gl::TEXTURE_2D, gl::TEXTURE_MAG_FILTER, gl::NEAREST as i32);
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id
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};
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Texture {
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id,
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}
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}
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pub fn bind (&self) {
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unsafe {
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gl::BindTexture (gl::TEXTURE_2D, self.id);
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}
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}
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}
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impl Drop for Texture {
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fn drop (&mut self)
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{
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if self.id == 0 {
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return;
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}
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unsafe {
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gl::DeleteTextures (1, &self.id);
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}
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self.id = 0;
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}
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}
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