From 740959405b1e9a1312798b482053c01b1fab4dbb Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Mon, 17 Oct 2022 15:27:33 +0200
Subject: a

---
 .gitignore               |    2 +
 Cargo.lock               | 1118 ++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml               |   14 +
 readme.md                |    8 +
 src/main.rs              |   87 ++++
 src/render/composite.rs  |   47 ++
 src/render/mod.rs        |    3 +
 src/render/models.rs     |   36 ++
 src/render/processing.rs |  134 ++++++
 9 files changed, 1449 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 readme.md
 create mode 100644 src/main.rs
 create mode 100644 src/render/composite.rs
 create mode 100644 src/render/mod.rs
 create mode 100644 src/render/models.rs
 create mode 100644 src/render/processing.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..85ef3d0
--- /dev/null
+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..7fed6e1
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..c86bb65
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "trash-map"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+fastnbt = "2.3.2"
+fastanvil = "0.26.0"
+
+image = "0.24.4"
+imageproc = "0.23.0"
+
+log = "0.4.17"
+env_logger = "0.9.1"
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..ec8b457
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,8 @@
+# trash-map
+
+A minecraft map renderer.
+
+## Usage
+
+- Unzip a resource pack to `./assets` (the minecraft version jar is a valid resource pack btw)
+- Run the server in your server's directory: `trash-map`
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..92d07b7
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,87 @@
+pub mod render;
+
+use crate::render::{
+    composite::{
+        image_buffer_blit, isometric_coord_mapping, CHUNK_HEIGHT, CHUNK_SIZE, REGION_SIZE,
+    },
+    models::processed_block_texture,
+    processing::Texture,
+};
+use fastanvil::{tex::Render, Block, Chunk, CurrentJavaChunk, RegionLoader};
+use image::{ImageBuffer, Rgba};
+use log::debug;
+use std::{collections::HashMap, path::Path};
+
+fn main() {
+    env_logger::builder()
+        .filter_level(log::LevelFilter::Debug)
+        .parse_env("LOG")
+        .build();
+
+    let loader = fastanvil::RegionFileLoader::new(
+        Path::new("/home/muffin/containers/games/home/user/server/world/region/").to_path_buf(),
+    );
+
+    let mut region = loader
+        .region(fastanvil::RCoord(0), fastanvil::RCoord(0))
+        .unwrap();
+
+    let chunk = region.read_chunk(0, 0).unwrap().unwrap();
+
+    let chunk: CurrentJavaChunk = fastnbt::from_bytes(&chunk).unwrap();
+
+    let mut visible_blocks = Vec::new();
+
+    for x in 0..16 {
+        for y in -64..256 {
+            for z in 0..16 {
+                let solid = |x: isize, y: isize, z: isize| {
+                    if x >= 0 && z >= 0 && x < 16 && z < 16 && y >= -64 && y < 256 {
+                        chunk
+                            .block(x as usize, y, z as usize)
+                            .map(|b| b.name() != "minecraft:air")
+                            .unwrap_or(false)
+                    } else {
+                        false
+                    }
+                };
+                let visible = solid(x, y, z)
+                    && !(solid(x + 1, y, z)
+                        && solid(x - 1, y, z)
+                        && solid(x, y + 1, z)
+                        && solid(x, y - 1, z)
+                        && solid(x, y, z + 1)
+                        && solid(x, y, z - 1));
+
+                if visible {
+                    visible_blocks.push((x, y, z))
+                }
+            }
+        }
+    }
+
+    debug!("{} potentially visible blocks", visible_blocks.len());
+    debug!("sorting by z-order");
+    visible_blocks.sort_by_cached_key(|(x, y, z)| x + y + z);
+    debug!("done");
+
+    let mut view: Texture = ImageBuffer::new(
+        16 * CHUNK_SIZE as u32,
+        16 * (CHUNK_SIZE as u32 + CHUNK_HEIGHT as u32) / 2,
+    );
+
+    let mut textures = HashMap::<String, Texture>::new();
+
+    for (x, y, z) in visible_blocks {
+        let coords = isometric_coord_mapping(x as i32, y as i32, z as i32);
+        let name = &chunk.block(x as usize, y, z as usize).unwrap().name()["minecraft:".len()..];
+        let texture = textures
+            .entry(name.to_owned())
+            .or_insert_with(|| processed_block_texture(name));
+
+        println!("{coords:?}");
+        image_buffer_blit(&mut view, texture, coords);
+    }
+
+    view.save(format!("/tmp/a.png")).unwrap();
+}
diff --git a/src/render/composite.rs b/src/render/composite.rs
new file mode 100644
index 0000000..51c6f6a
--- /dev/null
+++ b/src/render/composite.rs
@@ -0,0 +1,47 @@
+use image::ImageBuffer;
+use image::Rgba;
+
+pub const REGION_SIZE: usize = 16 * 8;
+pub const CHUNK_HEIGHT: usize = 384;
+pub const CHUNK_SIZE: usize = 16;
+
+pub fn image_buffer_blit(
+    target: &mut ImageBuffer<Rgba<u8>, Vec<u8>>,
+    source: &ImageBuffer<Rgba<u8>, Vec<u8>>,
+    offset: (u32, u32),
+) {
+    for (x, y, source_pixel) in source.enumerate_pixels() {
+        let target_pixel = target.get_pixel_mut(x + offset.0, y + offset.1);
+        let sa = source_pixel.0[3] as u16;
+        let new_pixel = Rgba::from([
+            ((target_pixel.0[0] as u16 * (255 - sa)) / 255 + (source_pixel.0[0] as u16 * sa) / 255)
+                as u8,
+            ((target_pixel.0[1] as u16 * (255 - sa)) / 255 + (source_pixel.0[1] as u16 * sa) / 255)
+                as u8,
+            ((target_pixel.0[2] as u16 * (255 - sa)) / 255 + (source_pixel.0[2] as u16 * sa) / 255)
+                as u8,
+            255 - (((255 - target_pixel.0[3] as u16) * (255 - sa)) / 255) as u8,
+        ]);
+        *target_pixel = new_pixel;
+    }
+}
+
+pub fn isometric_coord_mapping(x: i32, y: i32, z: i32) -> (u32, u32) {
+    // const BASE_X: i32 = 1016;
+    // const BASE_Y: i32 = 2040;
+    const BASE_X: i32 = 128 - 8;
+    const BASE_Y: i32 = 2040;
+
+    const XDIFF: (i32, i32) = (-8, 4);
+    const ZDIFF: (i32, i32) = (8, 4);
+    const YDIFF: (i32, i32) = (0, -8);
+
+    let diff = (
+        XDIFF.0 * x + YDIFF.0 * y + ZDIFF.0 * z,
+        XDIFF.1 * x + YDIFF.1 * y + ZDIFF.1 * z,
+    );
+
+    let coords = (BASE_X + diff.0, BASE_Y + diff.1);
+
+    (coords.0 as u32, coords.1 as u32)
+}
diff --git a/src/render/mod.rs b/src/render/mod.rs
new file mode 100644
index 0000000..cd9856e
--- /dev/null
+++ b/src/render/mod.rs
@@ -0,0 +1,3 @@
+pub mod processing;
+pub mod models;
+pub mod composite;
diff --git a/src/render/models.rs b/src/render/models.rs
new file mode 100644
index 0000000..66b8714
--- /dev/null
+++ b/src/render/models.rs
@@ -0,0 +1,36 @@
+use super::processing::*;
+use image::{ImageBuffer, Rgba};
+
+pub fn processed_block_texture(name: &str) -> ImageBuffer<Rgba<u8>, Vec<u8>> {
+    let auto_block_texture = || block_texture(name);
+    match name {
+        "grass_block" => full_isometric_sides(
+            &biome_tint(&block_texture("grass_block_top")),
+            &block_texture("grass_block_side"),
+        ),
+        "oak_leaves" | "birch_leaves" | "acacia_leaves" | "jungle_leaves" | "dark_oak_leaves"
+        | "spruce_leaves" => full_isometric(&biome_tint(&auto_block_texture())),
+        "grass" => crossed_planes(&biome_tint(&auto_block_texture())),
+        "dandelion" | "orange_tulip" | "azure_bluet" | "allium" | "poppy" | "cornflower" => {
+            crossed_planes(&auto_block_texture())
+        }
+        "lilac" | "peony" | "rose_bush" | "tall_grass" => crossed_planes(&auto_block_texture()),
+        "water" => full_isometric_sides(
+            &crop16(&tint(&block_texture("water_still"), (0, 0, 255))),
+            &crop16(&tint(&block_texture("water_flow"), (0, 0, 255))),
+        ),
+        "lava" => full_isometric_sides(
+            &crop16(&block_texture("lava_still")),
+            &crop16(&block_texture("lava_flow")),
+        ),
+        "vine" => full_isometric(&biome_tint(&auto_block_texture())),
+        "lily_pad" => crossed_planes(&biome_tint(&auto_block_texture())),
+        "sugar_cane" => crossed_planes(&auto_block_texture()),
+
+        "removed" => full_isometric(&transparent()),
+        _ => {
+            // println!("{}", name);
+            full_isometric(&auto_block_texture())
+        }
+    }
+}
diff --git a/src/render/processing.rs b/src/render/processing.rs
new file mode 100644
index 0000000..451fab3
--- /dev/null
+++ b/src/render/processing.rs
@@ -0,0 +1,134 @@
+use image::{ImageBuffer, Rgba};
+use imageproc::geometric_transformations::Projection;
+use std::path::Path;
+
+pub type Texture = ImageBuffer<Rgba<u8>, Vec<u8>>;
+
+pub fn biome_tint(s: &Texture) -> Texture {
+    tint(s, (100, 200, 50))
+}
+
+pub fn tint(source: &Texture, tint: (u16, u16, u16)) -> Texture {
+    let mut t = ImageBuffer::new(16, 16);
+    for (x, y, p) in t.enumerate_pixels_mut() {
+        let sp = source.get_pixel(x, y);
+        *p = Rgba::from([
+            (sp.0[0] as u16 * tint.0 / 255) as u8,
+            (sp.0[1] as u16 * tint.1 / 255) as u8,
+            (sp.0[2] as u16 * tint.2 / 255) as u8,
+            sp.0[3],
+        ])
+    }
+    return t;
+}
+
+pub fn crop16(tex: &Texture) -> Texture {
+    let mut t = ImageBuffer::new(16, 16);
+    for (x, y, p) in t.enumerate_pixels_mut() {
+        let sp = tex.get_pixel(x, y);
+        *p = sp.clone();
+    }
+    return t;
+}
+
+pub fn transparent() -> Texture {
+    let mut t = ImageBuffer::new(16, 16);
+    for (_,_,p) in t.enumerate_pixels_mut() {
+        *p = Rgba::from([0,0,0,255])
+    }
+    return t;
+}
+
+pub fn block_texture(block_name: &str) -> Texture {
+    image::open(&Path::new(
+        format!("./assets/assets/minecraft/textures/block/{}.png", block_name).as_str(),
+    ))
+    .unwrap_or_else(|_err| {
+        image::open(&Path::new(
+            format!("./assets/assets/minecraft/textures/block/debug.png").as_str(),
+        ))
+        .expect("Could not even load the fallback texture")
+    })
+    .into_rgba8()
+}
+
+pub fn full_isometric(tex: &Texture) -> Texture {
+    full_isometric_sides(tex, tex)
+}
+
+pub fn full_isometric_sides(top: &Texture, side: &Texture) -> Texture {
+    let projection_y = Projection::from_control_points(
+        [(0.0, 0.0), (16.0, 0.0), (16.0, 16.0), (0.0, 16.0)],
+        [(0.0, 4.0), (8.0, 0.0), (16.0, 4.0), (8.0, 8.0)],
+    )
+    .unwrap();
+    let projection_x = Projection::from_control_points(
+        [(0.0, 0.0), (16.0, 0.0), (0.0, 16.0), (16.0, 16.0)],
+        [(0.0, 4.0), (8.0, 8.0), (0.0, 12.0), (8.0, 16.0)],
+    )
+    .unwrap();
+    let projection_z = Projection::from_control_points(
+        [(0.0, 0.0), (16.0, 0.0), (0.0, 16.0), (16.0, 16.0)],
+        [(8.0, 8.0), (16.0, 4.0), (8.0, 16.0), (16.0, 12.0)],
+    )
+    .unwrap();
+
+    let face_x = imageproc::geometric_transformations::warp(
+        &side,
+        &projection_x,
+        imageproc::geometric_transformations::Interpolation::Nearest,
+        Rgba::from([0, 0, 0, 0]),
+    );
+    let face_y = imageproc::geometric_transformations::warp(
+        &top,
+        &projection_y,
+        imageproc::geometric_transformations::Interpolation::Nearest,
+        Rgba::from([0, 0, 0, 0]),
+    );
+    let face_z = imageproc::geometric_transformations::warp(
+        &side,
+        &projection_z,
+        imageproc::geometric_transformations::Interpolation::Nearest,
+        Rgba::from([0, 0, 0, 0]),
+    );
+
+    composite_block_faces(&vec![face_x, face_y, face_z])
+}
+
+pub fn crossed_planes(tex: &Texture) -> Texture {
+    let projection = Projection::scale(0.6, 0.6);
+
+    imageproc::geometric_transformations::warp(
+        &tex,
+        &projection,
+        imageproc::geometric_transformations::Interpolation::Nearest,
+        Rgba::from([0, 0, 0, 0]),
+    )
+}
+
+pub fn composite_block_faces(faces: &Vec<Texture>) -> Texture {
+    let mut buf = image::ImageBuffer::new(16, 16);
+    for (x, y, pixel) in buf.enumerate_pixels_mut() {
+        let composite: (u16, u16, u16, u16) = faces
+            .iter()
+            .map(|f| {
+                let p = f.get_pixel(x, y).0;
+                (p[0] as u16, p[1] as u16, p[2] as u16, p[3] as u16)
+            })
+            .fold((0, 0, 0, 0), |a, v| {
+                (
+                    (a.0 * (255 - v.3)) / 255 + (v.0 * v.3) / 255,
+                    (a.1 * (255 - v.3)) / 255 + (v.1 * v.3) / 255,
+                    (a.2 * (255 - v.3)) / 255 + (v.2 * v.3) / 255,
+                    a.3 + v.3,
+                )
+            });
+        *pixel = Rgba::from([
+            composite.0.min(255) as u8,
+            composite.1.min(255) as u8,
+            composite.2.min(255) as u8,
+            composite.3.min(255) as u8,
+        ])
+    }
+    return buf;
+}
-- 
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