Render Texture Extraction

1 files changed, 38 insertions, 0 deletions

diff --git a/src/nodes.rs b/src/nodes.rs
new file mode 100644
index 0000000..bccd861
--- /dev/null
+++ b/src/nodes.rs
@@ -0,0 +1,38 @@
+use bevy::{prelude::*, render::{render_graph::{Node, RenderGraphContext, NodeRunError, RenderLabel}, renderer::RenderContext, render_asset::RenderAssets, render_resource::{ImageCopyBuffer, ImageDataLayout}}};
+
+use crate::render_assets::FramebufferExtractSource;
+
+#[derive(RenderLabel, Clone, PartialEq, Eq, Debug, Hash)]
+pub struct FramebufferExtractLabel;
+
+#[derive(Default)]
+pub struct FramebufferExtractNode;
+
+impl Node for FramebufferExtractNode {
+    fn run(
+        &self,
+        graph: &mut RenderGraphContext,
+        render_context: &mut RenderContext,
+        world: &World,
+    ) -> Result<(), NodeRunError> {
+        for (_, source) in world.resource::<RenderAssets<FramebufferExtractSource>>().iter() {
+            let Some(gpu_image) = world.resource::<RenderAssets<Image>>().get(&source.source_handle) else {
+                return Ok(())
+            };
+
+            render_context.command_encoder().copy_texture_to_buffer(
+                gpu_image.texture.as_image_copy(),
+                ImageCopyBuffer {
+                    buffer: &source.buffer,
+                    layout: ImageDataLayout {
+                        offset: 0,
+                        bytes_per_row: Some(source.padded_bytes_per_row),
+                        rows_per_image: None,
+                    },
+                },
+                source.source_size,
+            );
+        }
+        Ok(())
+    }
+}