From 73316d02cceeeb23f3082901d2541c987fa99ab5 Mon Sep 17 00:00:00 2001
From: Silas Bartha <silas@exvacuum.dev>
Date: Wed, 24 Apr 2024 23:56:11 -0400
Subject: Initial Commit

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+# grex_framebuffer_extract
+
+
+A plugin for the [Bevy](https://bevyengine.org) engine which allows for exporting framebuffer data from a camera.
+
+Currently it only supports cameras which render to a render texture.
+
+## Compatibility
+
+| Crate Version | Bevy Version |
+|---            |---           |
+| 0.1           | 0.13         |
+
+## Installation
+
+### Using git URL in Cargo.toml
+```toml
+[dependencies.grex_framebuffer_extract]
+git = "https://github.com/exvacuum/grex_framebuffer_extract.git"
+```
+
+## Usage
+
+In `main.rs`:
+```rs
+use bevy::prelude::*;
+use grex_framebuffer_extract;
+
+fn main() {
+    App::new()
+        .add_plugins((
+            DefaultPlugins,
+            grex_framebuffer_extract::FramebufferExtractPlugin,
+        ))
+        .run();
+}
+```
+
+When spawning a camera:
+```rs
+let size = Extent3d {
+    width: 640,
+    height: 480,
+    depth_or_array_layers: 1,
+};
+
+let mut image = Image {
+    texture_descriptor: TextureDescriptor {
+        label: None,
+        size,
+        dimension: TextureDimension::D2,
+        format: TextureFormat::R8Unorm,
+        mip_level_count: 1,
+        sample_count: 1,
+        usage: TextureUsages::TEXTURE_BINDING
+            | TextureUsages::COPY_SRC
+            | TextureUsages::RENDER_ATTACHMENT,
+        view_formats: &[],
+    },
+    ..default()
+};
+
+image.resize(size);
+
+let image_handle = images.add(image); // ResMut<Assets<Image>>
+
+commands.spawn((
+    Camera3dBundle {
+        camera: Camera {
+            target: image_handle.clone().into();
+            ..Default::default()
+        },
+        ..Default::default()
+    },
+    grex_framebuffer_extract::ExtractFramebufferBundle {
+        source: framebuffer_extract_sources.add(FramebufferExtractSource(image_handle.clone())), // ResMut<Assets<FramebufferExtractSource>>
+        destination: FramebufferExtractDestination::default(),
+    },
+));
+```
+
+The FramebufferExtractDestination component will contain the extracted image which can be used or saved for whatever you need.
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