first step for compute task

src/command_buffer.rs

@@ -57,6 +57,22 @@ pub unsafe fn create_command_buffers(device: &Device, data: &mut app_data::AppDa
             },
         };
 
+        // define the compute load before going into the render pass
+        if scene_handler.volumetrics.len() != 0 {
+            device.cmd_bind_pipeline(
+                *command_buffer, vk::PipelineBindPoint::COMPUTE, data.pipeline_compute); //todo build own pipeline
+
+            device.cmd_bind_descriptor_sets(
+                *command_buffer, 
+                vk::PipelineBindPoint::COMPUTE, 
+                data.pipeline_layout, 
+                0, 
+                &[data.descriptor_sets[i]],
+                 &[]);
+
+            device.cmd_dispatch(*command_buffer, (data.compute_task_one_size as f64 / 256.0).ceil() as u32, 1, 1);
+        }
+        // start render pass
         let clear_values = &[color_clear_value, depth_clear_value];
         let info = vk::RenderPassBeginInfo::builder()
             .render_pass(data.render_pass)