editing the image via vulkan compute shader

resources/shaders/add.compute

@@ -8,5 +8,5 @@ layout(set = 0, binding = 0) buffer Data {
 
 void main() {
     uint idx = gl_GlobalInvocationID.x;
-    data.data[idx] *= 12;
+    data.data[idx] += 30;
 }

src/main.rs

@@ -166,38 +166,50 @@ fn main() {
         let shader = cs::Shader::load(device.clone()).unwrap();
         ComputePipeline::new(device.clone(), &shader.main_entry_point(), &()).unwrap()
     });
-    let data_buffer = {
-        let data_iter = (0 .. 65536u32).map(|n| n);
-        CpuAccessibleBuffer::from_iter(device.clone(), BufferUsage::all(), data_iter).unwrap()
-    };
-    let set = Arc::new(PersistentDescriptorSet::start(pipeline.clone(), 0)
-        .add_buffer(data_buffer.clone()).unwrap()
-        .build().unwrap()
-    );
-    let command_buffer = AutoCommandBufferBuilder::primary_one_time_submit(device.clone(), queue.family()).unwrap()
-        .dispatch([1024, 1, 1], pipeline.clone(), set.clone(), ()).unwrap()
-        .build().unwrap();
-    let future = sync::now(device.clone())
-        .then_execute(queue.clone(), command_buffer).unwrap()
-        .then_signal_fence_and_flush().unwrap();
-    future.wait(None).unwrap();
-    let data_buffer_content = data_buffer.read().unwrap();
-    for n in 0 .. 65536u32 {
-        assert_eq!(data_buffer_content[n as usize], n * 12);
-    }
 
     let mut img = image::open("resources/images/funky-bird.jpg").unwrap();
     let xy = img.dimensions();
+    let data_length = xy.0*xy.1*3;
+    println!("Buffer length {}", data_length);
+
+    {
+        let data_buffer = {
+            let mut buff = img.as_flat_samples().samples.iter();
+            let data_iter = (0 .. data_length).map(|n| *(buff.next().unwrap()));
+            CpuAccessibleBuffer::from_iter(device.clone(), BufferUsage::all(), data_iter).unwrap()
+        };
+        let set = Arc::new(PersistentDescriptorSet::start(pipeline.clone(), 0)
+            .add_buffer(data_buffer.clone()).unwrap()
+            .build().unwrap()
+        );
+        let command_buffer = AutoCommandBufferBuilder::primary_one_time_submit(device.clone(), queue.family()).unwrap()
+            .dispatch([1024, 1, 1], pipeline.clone(), set.clone(), ()).unwrap()
+            .build().unwrap();
+        let future = sync::now(device.clone())
+            .then_execute(queue.clone(), command_buffer).unwrap()
+            .then_signal_fence_and_flush().unwrap();
+        future.wait(None).unwrap();
+        let data_buffer_content = data_buffer.read().unwrap();
+
+        for x in 0 .. xy.0 - 1 {
+            for y in 0 .. xy.1 - 1 {
+
+                let r = data_buffer_content[((xy.0 * y + x) * 3 + 0) as usize];
+                let g = data_buffer_content[((xy.0 * y + x) * 3 + 1) as usize];
+                let b = data_buffer_content[((xy.0 * y + x) * 3 + 2) as usize];
+                //let a = data_buffer_content[((xy.0 * y + x) * 4 + 3) as usize];
+
+
+                let old = img.get_pixel(x, y);
+                img.put_pixel(x, y, image::Rgba([r, g, b, 255]));
+
+            }
+        }
+    }
+
+    img.save("output.jpg");
 
     println!("Starting");
-//    for x in 0..xy.0 {
-//        for y in 0..xy.1 {
-//            let mut pixel = img.get_pixel(x, y);
-//            img.put_pixel(x, y, pixel);
-//        }
-//    }
-   // println!("Ending");
-   // img.save("fractal.png").unwrap();
 
     let mut window = RenderWindow::new(
         (512, 512),