adding a second image buffer for GPU only access. Immutable buffer is write once for textures only. No sampler for regular image buffer though??

src/vkprocessor.rs

@@ -31,6 +31,7 @@ use std::alloc::Layout;
 use vulkano::pipeline::viewport::Viewport;
 use image::ImageFormat;
 use vulkano::image::immutable::ImmutableImage;
+use vulkano::image::attachment::AttachmentImage;
 use vulkano::image::Dimensions;
 use vulkano::format::Format;
 use vulkano::sampler::{Sampler, Filter, MipmapMode, SamplerAddressMode};
@@ -114,6 +115,7 @@ pub struct VkProcessor<'a> {
     pub render_pass: Option<Arc<RenderPassAbstract + Send + Sync>>,
     pub vertex_buffer: Option<Arc<(dyn BufferAccess + std::marker::Send + std::marker::Sync + 'static)>>,
     pub dynamic_state: DynamicState,
+    pub graphics_iamge_swap_buffer: Option<i32>,
 }
 
 
@@ -157,6 +159,7 @@ impl<'a> VkProcessor<'a> {
             render_pass: Option::None,
             vertex_buffer: Option::None,
             dynamic_state: DynamicState { line_width: None, viewports: None, scissors: None },
+            graphics_iamge_swap_buffer: None,
         }
     }
 
@@ -338,13 +341,24 @@ impl<'a> VkProcessor<'a> {
             ).unwrap()
         };
 
+        let image = {
+            let image = image::load_from_memory_with_format(include_bytes!("../resources/images/funky-bird.jpg"),
+                                                            ImageFormat::JPEG).unwrap().to_rgba();
+            let dimensions = image.dimensions();
+            let image_data = image.into_raw().clone();
+
+            AttachmentImage::new(self.device.clone(),
+                                 [dimensions.0, dimensions.1],
+                                 Format::R8G8B8A8Srgb)
+        };
+
         let sampler = Sampler::new(self.device.clone(), Filter::Linear, Filter::Linear,
                                    MipmapMode::Nearest, SamplerAddressMode::Repeat, SamplerAddressMode::Repeat,
                                    SamplerAddressMode::Repeat, 0.0, 1.0, 0.0, 0.0).unwrap();
 
 
-//      Before we draw we have to create what is called a pipeline. This is similar to an OpenGL
+        // Before we draw we have to create what is called a pipeline. This is similar to an OpenGL
-//      program, but much more specific.
+        // program, but much more specific.
         let pipeline = GraphicsPipeline::start()
             // We need to indicate the layout of the vertices.
             // The type `SingleBufferDefinition` actually contains a template parameter corresponding
@@ -381,9 +395,11 @@ impl<'a> VkProcessor<'a> {
 
         self.img_set = Some(Arc::new(PersistentDescriptorSet::start(self.graphics_pipeline.clone().unwrap().clone(), 0)
             .add_sampled_image(texture.clone(), sampler.clone()).unwrap()
+            .add_image(image.unwrap().clone()).unwrap()
             .build().unwrap()));
 
         self.graphics_image_buffer = Some(texture.clone());
+        self.graphics_iamge_swap_buffer = Some(image.clone().unwrap());
     }
 
 
@@ -468,7 +484,7 @@ impl<'a> VkProcessor<'a> {
                               self.compute_pipeline.clone().unwrap().clone(),
                               self.compute_set.clone().unwrap().clone(), ()).unwrap()
 
-                   // .copy_buffer_to_image(self.img_buffers.get(0).unwrap().clone(), self.graphics_image_buffer.clone().unwrap()).unwrap()
+                    //.copy_buffer_to_image(self.img_buffers.get(0).unwrap().clone(), self.graphics_image_buffer.clone().unwrap()).unwrap()
                     .begin_render_pass(framebuffers[image_num].clone(), false, clear_values)
                     .unwrap()