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annotate examples/common.rs @ 705:ed65f9412bc0

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anmrenderer: split common loading functions in another module.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Fri, 23 Aug 2019 19:29:00 +0200
parents
children bca515da9047
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705
ed65f9412bc0 anmrenderer: split common loading functions in another module.
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1 use image::{GenericImageView, DynamicImage};
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2 use luminance::pixel::{NormRGB8UI, NormRGBA8UI};
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3 use luminance::texture::{Dim2, Flat, Sampler, Texture, GenMipmaps};
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4 use luminance_glfw::surface::GlfwSurface;
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5 use std::fs::File;
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6 use std::io::{BufReader, Read};
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7 use std::path::Path;
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8
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9 pub fn load_file_into_vec(filename: &Path) -> Vec<u8> {
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10 let file = File::open(filename).unwrap();
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11 let mut file = BufReader::new(file);
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12 let mut buf = vec![];
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13 file.read_to_end(&mut buf).unwrap();
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14 buf
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15 }
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16
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17 pub enum LoadedTexture {
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18 Rgba(Texture<Flat, Dim2, NormRGBA8UI>),
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19 Rgb(Texture<Flat, Dim2, NormRGB8UI>),
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20 }
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21
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22 pub fn load_rgb_png(surface: &mut GlfwSurface, path: &Path) -> Option<LoadedTexture> {
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23 // load the texture into memory as a whole bloc (i.e. no streaming)
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24 match image::open(&path) {
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25 Ok(img) => {
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26 let (width, height) = img.dimensions();
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27 let texels = img
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28 .pixels()
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29 .map(|(_x, _y, rgb)| (rgb[0], rgb[1], rgb[2]))
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30 .collect::<Vec<_>>();
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31
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32 // create the luminance texture; the third argument is the number of mipmaps we want (leave it
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33 // to 0 for now) and the latest is a the sampler to use when sampling the texels in the
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34 // shader (we’ll just use the default one)
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35 let tex =
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36 Texture::new(surface, [width, height], 0, &Sampler::default()).expect("luminance texture creation");
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37
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38 // the first argument disables mipmap generation (we don’t care so far)
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39 tex.upload(GenMipmaps::No, &texels);
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40
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41 Some(LoadedTexture::Rgb(tex))
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42 }
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43
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44 Err(e) => {
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45 eprintln!("cannot open image {}: {}", path.display(), e);
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46 None
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47 }
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48 }
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49 }
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50
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51 pub fn load_rgb_a_pngs(surface: &mut GlfwSurface, rgb: &Path, alpha: &Path) -> Option<LoadedTexture> {
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52 // load the texture into memory as a whole bloc (i.e. no streaming)
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53 match image::open(&alpha) {
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54 Ok(img) => {
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55 let (width, height) = img.dimensions();
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56 let alpha = match img.grayscale() {
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57 DynamicImage::ImageLuma8(img) => img,
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58 _ => {
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59 eprintln!("cannot convert alpha image {} to grayscale", alpha.display());
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60 return None;
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61 }
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62 };
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63 let img = match image::open(&rgb) {
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64 Ok(img) => img,
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65 Err(e) => {
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66 eprintln!("cannot open rgb image {}: {}", rgb.display(), e);
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67 return None;
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68 },
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69 };
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70 let texels = img
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71 .pixels()
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72 .zip(alpha.pixels())
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73 .map(|((_x, _y, rgb), luma)| (rgb[0], rgb[1], rgb[1], luma[0]))
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74 .collect::<Vec<_>>();
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75
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76 // create the luminance texture; the third argument is the number of mipmaps we want (leave it
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77 // to 0 for now) and the latest is a the sampler to use when sampling the texels in the
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78 // shader (we’ll just use the default one)
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79 let tex =
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80 Texture::new(surface, [width, height], 0, &Sampler::default()).expect("luminance texture creation");
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81
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82 // the first argument disables mipmap generation (we don’t care so far)
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83 tex.upload(GenMipmaps::No, &texels);
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84
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85 Some(LoadedTexture::Rgba(tex))
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86 }
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87
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88 Err(e) => {
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89 eprintln!("cannot open alpha image {}: {}", alpha.display(), e);
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90 None
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91 }
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92 }
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93 }