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use rin_material::texture::*;
#[cfg(image_enabled)]
use rin_graphics::image;
use rin_util::LogErr;
#[cfg(image_enabled)]
use rin_scene::CreationContext;
#[cfg(all(image_ty="image", feature="squish"))]
use rin_graphics::image::buffer::ConvertBuffer;
use rin_material::texture::TextureCreationFlags;

pub fn sampler_from_blender(image: &rinblender::Image) -> Sampler{
    let wrap = match image.wrap{
        rinblender::texture::Wrap::Repeat => Wrap::Repeat,
        rinblender::texture::Wrap::Extend => Wrap::Extend,
        rinblender::texture::Wrap::Clip => Wrap::Clip,
    };

    let (minfilter, magfilter) = match image.interpolation{
        rinblender::texture::Interpolation::Closest => (Filter::NearestMipNearest, Filter::Nearest),
        rinblender::texture::Interpolation::Linear => (Filter::LinearMipLinear, Filter::Linear),
        _ => (Filter::LinearMipLinear, Filter::Linear),
    };

    Sampler{
        wrap,
        minfilter,
        magfilter
    }
}

#[cfg(image_ty="freeimage")]
pub fn load_texture<'a, C: CreationContext<'a>>(i: rinblender::Texture, world: &mut C) -> Option<TextureRef>{
    let flags = TextureCreationFlags::MIPMAPS;

    let tex = if !i.image.modifiers.is_empty(){
        log::error!("texture modifiers not supported yet when using freeimage");
        None
    }else{
        image::load_from_memory(&i.data)
            .log_err("Error loading blender texture").ok()
            .and_then(|img| world.register_image(&img, flags).ok())
    };

    tex
}

#[cfg(image_ty="image")]
pub fn load_texture<'a, C: CreationContext<'a>>(i: rinblender::Texture, world: &mut C) -> Option<TextureRef>{
    let flags = TextureCreationFlags::MIPMAPS;

    let tex = if let Ok(image::ImageFormat::Hdr) = image::guess_format(&i.data){
        if !i.image.modifiers.is_empty(){
            log::error!("texture modifiers not supported yet when using freeimage");
        }
        rin_graphics::Hdr::from_bytes(&i.data)
            .log_err("Error loading blender texture").ok()
            .map(|img| img.flip_v())
            .and_then(|img| world.register_image(&img, flags).ok())
    }else{
        image::load_from_memory(&i.data)
            .log_err("").ok()
            .and_then(|img| {
                let mut img = img.to_rgba();

                for (m, factor) in i.image.modifiers.iter(){
                    match m {
                        rinblender::texture::Modifier::Hsv(h,s,v) => {
                            if *h != 0. {
                                img = image::imageops::huerotate(&img, (h * factor * 360.) as i32);
                            }
                            if *s != 1.{

                            }
                            if *v != 1.{
                                img = image::imageops::brighten(&img, ((v - 1.) * 255.) as i32);
                            }
                        }

                        rinblender::texture::Modifier::Hue(h) => if *h != 0. {
                            img = image::imageops::huerotate(&img, (h * factor * 360.) as i32);
                        }

                        rinblender::texture::Modifier::Value(v) => if *v != 1.{
                            img = image::imageops::brighten(&img, ((v - 1.) * 255.) as i32);
                        }

                        _ => (),
                    }
                }

                world.register_image(&img, flags).ok()
            })
    };

    tex
}

#[cfg(image_ty="freeimage")]
fn convert_pre_compress(img: image::Image) -> image::Image {
    #[cfg(feature="squish")]
    if img.ty() == image::Type::BITMAP {
        let mut img = if img.bpp() != 32 {
            img.to_32bits().unwrap()
        }else{
            img
        };

        let r = img.channel(image::ColorChannel::RED).unwrap();
        let b = img.channel(image::ColorChannel::BLUE).unwrap();
        img.set_channel(&r, image::ColorChannel::BLUE);
        img.set_channel(&b, image::ColorChannel::RED);
        return img;
    }

    img
}

#[cfg(image_ty="image")]
fn convert_pre_compress(img: image::Image) -> image::Image {
    match img{
        #[cfg(feature="squish")]
        image::DynamicImage::ImageRgba8(rgba) => {
            image::DynamicImage::ImageRgba8(rgba)
        }

        #[cfg(feature="squish")]
        image::DynamicImage::ImageRgb8(rgb) => {
            let rgba: image::RgbaImage = rgb.convert();
            image::DynamicImage::ImageRgba8(rgba)
        }

        _ => img
    }
}

#[cfg(all(feature="squish", image_ty="freeimage"))]
fn can_be_compressed(img: &image::Image) -> bool {
    img.ty() == image::Type::BITMAP
}


#[cfg(all(feature="squish", image_ty="image"))]
fn can_be_compressed(img: &image::Image) -> bool {
    match img{
        image::DynamicImage::ImageRgba8(_) => true,
        _ => false,
    }
}

#[cfg(feature="rayon")]
#[cfg(image_enabled)]
pub fn load_images_data<'a, 'w, 'c, C, I>(images: I, world: &'w mut C) -> impl Iterator<Item = (rinblender::ObjectId, Option<TextureRef>)> + 'w
where
    C: CreationContext<'c>,
    I: rayon::iter::ParallelIterator<Item = (&'a rinblender::ObjectId, String, &'a rinblender::texture::Data)>
{
    let flags = TextureCreationFlags::MIPMAPS;
    let (tx, rx) = crossbeam::channel::unbounded();
    images.for_each(|(objectid, name, i)| {
        if let Ok(img) = image::load_from_memory(&i.data)
            .log_err("Error loading blender texture")
        {
            let img = convert_pre_compress(img);
            tx.send((objectid.to_owned(), Some((name.to_owned(), img)))).unwrap();
        }else{
            tx.send((objectid.to_owned(), None)).unwrap();
        }
    });

    rx.into_iter().map(move |(objectid, name_img)| {
        if let Some((name, img)) = name_img {
            #[cfg(feature="squish")]
            if can_be_compressed(&img) {
                (objectid, world.register_compress_named_image(&name, &img, flags).ok())
            }else{
                (objectid, world.register_named_image(&name, &img, flags).ok())
            }

            #[cfg(not(feature="squish"))]
            (objectid, world.register_named_image(&name, &img, flags).ok())
        }else{
            (objectid, None)
        }
    })
}

#[cfg(not(feature="rayon"))]
#[cfg(image_enabled)]
pub fn load_images_data<'a, 'w, 'c, C, I>(images: I, world: &'w mut C) -> impl Iterator<Item = (rinblender::ObjectId, Option<TextureRef>)>
where
    C: CreationContext<'c>,
    I: Iterator<Item = (&'a rinblender::ObjectId, String, &'a rinblender::texture::Data)>
{
    let flags = TextureCreationFlags::MIPMAPS;
    images.map(|(objectid, name, i)| {
        if let Ok(img) = image::load_from_memory(&i.data)
            .log_err("Error loading blender texture")
        {
            let img = convert_pre_compress(img);

            #[cfg(feature="squish")]
            if can_be_compressed(&img) {
                (objectid, world.register_compress_named_image(&name, &img, flags).ok())
            }else{
                (objectid, world.register_named_image(&name, &img, flags).ok())
            }

            #[cfg(not(feature="squish"))]
            (objectid.to_owned(), world.register_named_image(&name, &img, flags).ok())
        }else{
            (objectid.to_owned(), None)
        }
    }).collect::<Vec<_>>().into_iter()
}