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examples: Use array textures for enemy PNGs This requires luminance 0.39.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 25 Feb 2020 21:03:44 +0100
parents 5e5e7136ac92
children
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1 use image::{GenericImageView, DynamicImage, GrayImage, ImageError};
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2 use luminance::pixel::{NormRGB8UI, NormRGBA8UI};
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3 use luminance::texture::{Dim2, Dim2Array, Sampler, Texture, GenMipmaps};
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4 use luminance_glfw::GlfwSurface;
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5 use touhou::th06::anm0::Anm0;
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6 use std::fs::File;
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7 use std::io::{self, BufReader, Read};
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8 use std::path::Path;
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9
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10 pub fn load_file_into_vec<P: AsRef<Path>>(filename: P) -> io::Result<Vec<u8>> {
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11 let file = File::open(filename)?;
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12 let mut file = BufReader::new(file);
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13 let mut buf = vec![];
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14 file.read_to_end(&mut buf)?;
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15 Ok(buf)
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16 }
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17
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18 pub enum LoadedTexture {
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19 Rgba(Texture<Dim2, NormRGBA8UI>),
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20 Rgb(Texture<Dim2, NormRGB8UI>),
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21 RgbaArray(Texture<Dim2Array, NormRGBA8UI>),
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22 }
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23
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24 #[derive(Debug)]
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25 pub enum TextureLoadError {
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26 CannotOpenRgb(String, ImageError),
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27 CannotOpenAlpha(String, ImageError),
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28 AlphaToGrayscale(String),
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29 }
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30
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31 fn open_rgb_png(path: &Path) -> Result<DynamicImage, TextureLoadError> {
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32 // load the texture into memory as a whole bloc (i.e. no streaming)
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33 image::open(&path).map_err(|e| TextureLoadError::CannotOpenRgb(path.to_str().unwrap().to_owned(), e))
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34 }
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35
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36 fn open_alpha_png(path: &Path) -> Result<DynamicImage, TextureLoadError> {
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37 // load the texture into memory as a whole bloc (i.e. no streaming)
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38 image::open(&path).map_err(|e| TextureLoadError::CannotOpenAlpha(path.to_str().unwrap().to_owned(), e))
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39 }
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40
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41 fn merge_rgb_alpha(rgb: &DynamicImage, alpha: &GrayImage) -> Vec<(u8, u8, u8, u8)> {
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42 rgb
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43 .pixels()
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44 .zip(alpha.pixels())
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45 .map(|((_x, _y, rgb), luma)| (rgb[0], rgb[1], rgb[2], luma[0]))
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46 .collect::<Vec<_>>()
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47 }
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48
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49 pub fn load_from_data(data: &[u8]) -> Result<DynamicImage, ImageError> {
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50 image::load_from_memory(data)
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51 }
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52
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53 pub fn reupload_texture_from_rgb_image(tex: &mut Texture<Dim2, NormRGB8UI>, img: DynamicImage) -> Result<(), TextureLoadError> {
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54 let texels = img
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55 .pixels()
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56 .map(|(_x, _y, rgb)| (rgb[0], rgb[1], rgb[2]))
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57 .collect::<Vec<_>>();
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58
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59 // the first argument disables mipmap generation (we don’t care so far)
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60 tex.upload(GenMipmaps::No, &texels).unwrap();
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61
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62 Ok(())
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63 }
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64
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65 pub fn upload_texture_from_rgb_image(surface: &mut GlfwSurface, img: DynamicImage) -> Result<LoadedTexture, TextureLoadError> {
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66 let (width, height) = img.dimensions();
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67
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68 // create the luminance texture; the third argument is the number of mipmaps we want (leave it
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69 // to 0 for now) and the latest is a the sampler to use when sampling the texels in the
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70 // shader (we’ll just use the default one)
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71 let mut tex =
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72 Texture::new(surface, [width, height], 0, Sampler::default()).expect("luminance texture creation");
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73
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74 reupload_texture_from_rgb_image(&mut tex, img)?;
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75
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76 Ok(LoadedTexture::Rgb(tex))
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77 }
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78
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79 pub fn load_rgb_texture(surface: &mut GlfwSurface, path: &Path) -> Result<LoadedTexture, TextureLoadError> {
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80 let img = open_rgb_png(&path)?;
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81 upload_texture_from_rgb_image(surface, img)
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82 }
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83
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84 fn load_rgb_a_pngs(surface: &mut GlfwSurface, rgb: &Path, alpha: &Path) -> Result<LoadedTexture, TextureLoadError> {
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85 let img = open_alpha_png(&alpha)?;
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86 let alpha = match img.grayscale() {
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87 DynamicImage::ImageLuma8(img) => img,
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88 _ => {
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89 return Err(TextureLoadError::AlphaToGrayscale(alpha.to_str().unwrap().to_owned()))
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90 }
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91 };
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92 let (width, height) = img.dimensions();
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93 let img = open_rgb_png(&rgb)?;
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94 assert_eq!((width, height), img.dimensions());
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95 let texels = merge_rgb_alpha(&img, &alpha);
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96
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97 // create the luminance texture; the third argument is the number of mipmaps we want (leave it
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98 // to 0 for now) and the latest is a the sampler to use when sampling the texels in the
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99 // shader (we’ll just use the default one)
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100 let tex =
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101 Texture::new(surface, [width, height], 0, Sampler::default()).expect("luminance texture creation");
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102
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103 // the first argument disables mipmap generation (we don’t care so far)
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104 tex.upload(GenMipmaps::No, &texels).unwrap();
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105
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106 Ok(LoadedTexture::Rgba(tex))
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107 }
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108
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109 pub fn load_anm_image<P: AsRef<Path>>(mut surface: &mut GlfwSurface, anm0: &Anm0, anm_filename: P) -> Result<LoadedTexture, TextureLoadError> {
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110 let anm_filename = anm_filename.as_ref();
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111 let png_filename = anm_filename.with_file_name(Path::new(&anm0.png_filename).file_name().unwrap());
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112 match anm0.alpha_filename {
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113 Some(ref filename) => {
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114 let alpha_filename = anm_filename.with_file_name(Path::new(filename).file_name().unwrap());
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115 load_rgb_a_pngs(&mut surface, &png_filename, &alpha_filename)
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116 },
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117 None => {
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118 load_rgb_texture(&mut surface, &png_filename)
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119 }
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120 }
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121 }
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122
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123 fn load_array_texture(surface: &mut GlfwSurface, images: &[(&Path, &Path)]) -> Result<LoadedTexture, TextureLoadError> {
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124 let mut decoded = vec![];
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125 let dimensions = (256, 256);
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126 for (rgb, alpha) in images {
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127 let img = open_alpha_png(&alpha)?;
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128 assert_eq!(dimensions, img.dimensions());
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129 let alpha = match img.grayscale() {
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130 DynamicImage::ImageLuma8(img) => img,
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131 _ => {
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132 return Err(TextureLoadError::AlphaToGrayscale(alpha.to_str().unwrap().to_owned()))
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133 }
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134 };
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135 let img = open_rgb_png(&rgb)?;
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136 assert_eq!(dimensions, img.dimensions());
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137 let texels = merge_rgb_alpha(&img, &alpha);
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138 decoded.push(texels);
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139 }
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140
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141 // create the luminance texture; the third argument is the number of mipmaps we want (leave it
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142 // to 0 for now) and the latest is a the sampler to use when sampling the texels in the
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143 // shader (we’ll just use the default one)
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144 let tex =
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145 Texture::new(surface, ([dimensions.0, dimensions.1], images.len() as u32), 0, Sampler::default()).expect("luminance texture creation");
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146
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147 // the first argument disables mipmap generation (we don’t care so far)
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148 tex.upload(GenMipmaps::No, &decoded.into_iter().flatten().collect::<Vec<_>>()).unwrap();
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149
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150 Ok(LoadedTexture::RgbaArray(tex))
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151 }
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152
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153 pub fn load_multiple_anm_images<P: AsRef<Path>>(mut surface: &mut GlfwSurface, anms: &[Anm0], anm_filename: P) -> Result<LoadedTexture, TextureLoadError> {
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154 let anm_filename = anm_filename.as_ref();
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155 let mut paths = vec![];
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156 for anm0 in anms.iter() {
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157 let rgb_filename = anm_filename.with_file_name(Path::new(&anm0.png_filename).file_name().unwrap());
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158 let filename = anm0.alpha_filename.as_ref().expect("Can’t not have alpha here!");
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159 let alpha_filename = anm_filename.with_file_name(Path::new(filename).file_name().unwrap());
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160 paths.push((rgb_filename, alpha_filename));
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161 }
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162 let paths: Vec<_> = paths.iter().map(|(rgb, alpha)| (rgb.as_ref(), alpha.as_ref())).collect();
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163 load_array_texture(&mut surface, paths.as_slice())
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164 }