From b8931937534974710b87952ec648f50144a0c279 Mon Sep 17 00:00:00 2001
From: griffi-gh <prasol258@gmail.com>
Date: Thu, 23 Nov 2023 21:27:11 +0100
Subject: [PATCH] wip

---
 Cargo.lock            | 10 --------
 kubi-ui/Cargo.toml    |  4 ++--
 kubi-ui/src/texman.rs | 56 ++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 57 insertions(+), 13 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index dd6ec0c..f473484 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -112,15 +112,6 @@ version = "1.0.75"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4668cab20f66d8d020e1fbc0ebe47217433c1b6c8f2040faf858554e394ace6"
 
-[[package]]
-name = "approx"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cab112f0a86d568ea0e627cc1d6be74a1e9cd55214684db5561995f6dad897c6"
-dependencies = [
- "num-traits",
-]
-
 [[package]]
 name = "arrayref"
 version = "0.3.7"
@@ -680,7 +671,6 @@ version = "0.24.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5418c17512bdf42730f9032c74e1ae39afc408745ebb2acf72fbc4691c17945"
 dependencies = [
- "approx",
  "serde",
 ]
 
diff --git a/kubi-ui/Cargo.toml b/kubi-ui/Cargo.toml
index aded733..719428a 100644
--- a/kubi-ui/Cargo.toml
+++ b/kubi-ui/Cargo.toml
@@ -7,7 +7,7 @@ publish = false
 [dependencies]
 hashbrown = "0.14"
 nohash-hasher = "0.2"
-glam = { version = "0.24", features = ["approx"] }
+glam = "0.24"
 glium = { git = "https://github.com/glium/glium", rev = "968fc92378caf", optional = true }
 fontdue = { version = "0.7", optional = true }
 rect_packer = { version = "0.2.1", optional = true }
@@ -21,7 +21,7 @@ winit = "0.29"
 [features]
 default = ["builtin_elements", "texture_manager", "text_rendering", "builtin_font", "backend_glium"]
 backend_glium = ["dep:glium"]
-texture_manager = []
+texture_manager = ["dep:rect_packer"]
 text_rendering = ["dep:fontdue", "texture_manager"]
 builtin_font = ["text_rendering"]
 builtin_elements = []
diff --git a/kubi-ui/src/texman.rs b/kubi-ui/src/texman.rs
index 69761a2..44cdb52 100644
--- a/kubi-ui/src/texman.rs
+++ b/kubi-ui/src/texman.rs
@@ -1,3 +1,57 @@
-struct TextureSpace {
+use rect_packer::{Packer, Config as PackerConfig};
+use glam::{IVec2, ivec2};
 
+#[derive(Clone, Copy)]
+pub struct TextureAllocation {
+  // pub index: usize,
+  pub position: IVec2,
+  pub size: IVec2,
+  in_texture_size: IVec2,
+}
+
+impl TextureAllocation {
+  pub fn uv(&self) -> (f32, f32, f32, f32) {
+    let p0 = self.position.as_vec2() / self.in_texture_size.as_vec2();
+    let p1 = (self.position + self.size).as_vec2() / self.in_texture_size.as_vec2();
+    (p0.x, p0.y, p1.x, p1.y)
+  }
+}
+
+pub struct TextureSpace {
+  size: IVec2,
+  packer: Packer,
+  // allocations: Vec<TextureAllocation>,
+}
+
+impl TextureSpace {
+  pub fn new(size: IVec2) -> Self {
+    Self {
+      size,
+      packer: Packer::new(PackerConfig {
+        width: size.x,
+        height: size.y,
+        border_padding: 1,
+        rectangle_padding: 1,
+      }),
+      // allocations: Vec::new(),
+    }
+  }
+
+  pub fn size(&self) -> IVec2 {
+    self.size
+  }
+
+  pub fn allocate(&mut self, size: IVec2) -> Option<TextureAllocation> {
+    let position = self.packer.pack(size.x, size.y, false)
+      .map(|rect| ivec2(rect.x, rect.y))?;
+    Some(TextureAllocation {
+      position,
+      size,
+      in_texture_size: self.size
+    })
+  }
+
+  // pub fn lookup(&self, index: usize) -> Option<TextureAllocation> {
+  //   self.allocations.get(index).copied()
+  // }
 }