Fix support for 2D array images (#1803)

* Fix mipmap generation for arrayed images

* Add example for texture array

* Change ImageView constructor to explicitly require ImageViewType

* Revert "Change ImageView constructor to explicitly require ImageViewType"

This reverts commit 3ad5571.

examples/src/bin/texture_array/main.rs

@@ -0,0 +1,381 @@
+// Copyright (c) 2016 The vulkano developers
+// Licensed under the Apache License, Version 2.0
+// <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT
+// license <LICENSE-MIT or https://opensource.org/licenses/MIT>,
+// at your option. All files in the project carrying such
+// notice may not be copied, modified, or distributed except
+// according to those terms.
+
+use std::io::Cursor;
+use std::sync::Arc;
+
+use png;
+use winit::event::{Event, WindowEvent};
+use winit::event_loop::{ControlFlow, EventLoop};
+use winit::window::{Window, WindowBuilder};
+
+use vulkano::buffer::{BufferUsage, CpuAccessibleBuffer, TypedBufferAccess};
+use vulkano::command_buffer::{AutoCommandBufferBuilder, CommandBufferUsage, SubpassContents};
+use vulkano::descriptor_set::{PersistentDescriptorSet, WriteDescriptorSet};
+use vulkano::device::{Device, DeviceExtensions, Features};
+use vulkano::device::physical::{PhysicalDevice, PhysicalDeviceType};
+use vulkano::format::Format;
+use vulkano::image::{
+    ImageDimensions, ImageUsage, ImmutableImage, MipmapsCount, SwapchainImage, view::ImageView,
+};
+use vulkano::image::ImageAccess;
+use vulkano::instance::Instance;
+use vulkano::pipeline::{GraphicsPipeline, Pipeline, PipelineBindPoint};
+use vulkano::pipeline::graphics::color_blend::ColorBlendState;
+use vulkano::pipeline::graphics::input_assembly::{InputAssemblyState, PrimitiveTopology};
+use vulkano::pipeline::graphics::vertex_input::BuffersDefinition;
+use vulkano::pipeline::graphics::viewport::{Viewport, ViewportState};
+use vulkano::render_pass::{Framebuffer, RenderPass, Subpass};
+use vulkano::sampler::{Filter, Sampler, SamplerAddressMode};
+use vulkano::swapchain::{self, AcquireError, Swapchain, SwapchainCreationError};
+use vulkano::sync::{self, FlushError, GpuFuture};
+use vulkano::Version;
+use vulkano_win::VkSurfaceBuild;
+
+fn main() {
+    // This example is about this:
+    //     uniform sampler2DArray texture_array;
+    // And not this:
+    //     uniform sampler2D array_of_textures[42];
+
+    let required_extensions = vulkano_win::required_extensions();
+    let instance = Instance::new(None, Version::V1_1, &required_extensions, None).unwrap();
+
+    let event_loop = EventLoop::new();
+    let surface = WindowBuilder::new()
+        .build_vk_surface(&event_loop, instance.clone())
+        .unwrap();
+
+    let device_extensions = DeviceExtensions {
+        khr_swapchain: true,
+        ..DeviceExtensions::none()
+    };
+    let (physical_device, queue_family) = PhysicalDevice::enumerate(&instance)
+        .filter(|&p| p.supported_extensions().is_superset_of(&device_extensions))
+        .filter_map(|p| {
+            p.queue_families()
+                .find(|&q| q.supports_graphics() && surface.is_supported(q).unwrap_or(false))
+                .map(|q| (p, q))
+        })
+        .min_by_key(|(p, _)| match p.properties().device_type {
+            PhysicalDeviceType::DiscreteGpu => 0,
+            PhysicalDeviceType::IntegratedGpu => 1,
+            PhysicalDeviceType::VirtualGpu => 2,
+            PhysicalDeviceType::Cpu => 3,
+            PhysicalDeviceType::Other => 4,
+        })
+        .unwrap();
+
+    println!(
+        "Using device: {} (type: {:?})",
+        physical_device.properties().device_name,
+        physical_device.properties().device_type,
+    );
+
+    let (device, mut queues) = Device::new(
+        physical_device,
+        &Features::none(),
+        &physical_device
+            .required_extensions()
+            .union(&device_extensions),
+        [(queue_family, 0.5)].iter().cloned(),
+    )
+        .unwrap();
+    let queue = queues.next().unwrap();
+
+    let (mut swapchain, images) = {
+        let caps = surface.capabilities(physical_device).unwrap();
+        let composite_alpha = caps.supported_composite_alpha.iter().next().unwrap();
+        let format = caps.supported_formats[0].0;
+        let dimensions: [u32; 2] = surface.window().inner_size().into();
+
+        Swapchain::start(device.clone(), surface.clone())
+            .num_images(caps.min_image_count)
+            .format(format)
+            .dimensions(dimensions)
+            .usage(ImageUsage::color_attachment())
+            .sharing_mode(&queue)
+            .composite_alpha(composite_alpha)
+            .build()
+            .unwrap()
+    };
+
+    #[repr(C)]
+    #[derive(Default, Debug, Clone)]
+    struct Vertex {
+        position: [f32; 2],
+    }
+    vulkano::impl_vertex!(Vertex, position);
+
+    let vertex_buffer = CpuAccessibleBuffer::<[Vertex]>::from_iter(
+        device.clone(),
+        BufferUsage::all(),
+        false,
+        [
+            Vertex {
+                position: [-0.2, -0.5],
+            },
+            Vertex {
+                position: [-0.5, 0.8],
+            },
+            Vertex {
+                position: [0.4, -0.5],
+            },
+            Vertex {
+                position: [0.5, 0.2],
+            },
+        ]
+            .iter()
+            .cloned(),
+    )
+        .unwrap();
+
+    let vs = vs::load(device.clone()).unwrap();
+    let fs = fs::load(device.clone()).unwrap();
+
+    let render_pass = vulkano::single_pass_renderpass!(device.clone(),
+        attachments: {
+            color: {
+                load: Clear,
+                store: Store,
+                format: swapchain.format(),
+                samples: 1,
+            }
+        },
+        pass: {
+            color: [color],
+            depth_stencil: {}
+        }
+    )
+        .unwrap();
+
+    let (texture, tex_future) = {
+        let image_array_data: Vec<_> = vec![include_bytes!("square.png").to_vec(), include_bytes!("star.png").to_vec(), include_bytes!("asterisk.png").to_vec()]
+            .into_iter().flat_map(|png_bytes| {
+            let cursor = Cursor::new(png_bytes);
+            let decoder = png::Decoder::new(cursor);
+            let mut reader = decoder.read_info().unwrap();
+            let info = reader.info();
+            let mut image_data = Vec::new();
+            image_data.resize((info.width * info.height * 4) as usize, 0);
+            reader.next_frame(&mut image_data).unwrap();
+            image_data
+        }).collect();
+        let dimensions = ImageDimensions::Dim2d {
+            width: 128,
+            height: 128,
+            array_layers: 3,
+        }; // TODO replace with your actual image array dimensions
+        let (image, future) = ImmutableImage::from_iter(
+            image_array_data.iter().cloned(),
+            dimensions,
+            MipmapsCount::Log2,
+            Format::R8G8B8A8_SRGB,
+            queue.clone(),
+        )
+            .unwrap();
+        (ImageView::new(image).unwrap(), future)
+    };
+
+    let sampler = Sampler::simple_repeat_linear(device.clone()).unwrap();
+
+    let subpass = Subpass::from(render_pass.clone(), 0).unwrap();
+    let pipeline = GraphicsPipeline::start()
+        .vertex_input_state(BuffersDefinition::new().vertex::<Vertex>())
+        .vertex_shader(vs.entry_point("main").unwrap(), ())
+        .input_assembly_state(InputAssemblyState::new().topology(PrimitiveTopology::TriangleStrip))
+        .viewport_state(ViewportState::viewport_dynamic_scissor_irrelevant())
+        .fragment_shader(fs.entry_point("main").unwrap(), ())
+        .color_blend_state(ColorBlendState::new(subpass.num_color_attachments()).blend_alpha())
+        .render_pass(subpass)
+        .build(device.clone())
+        .unwrap();
+
+    let layout = pipeline.layout().descriptor_set_layouts().get(0).unwrap();
+    let set = PersistentDescriptorSet::new(
+        layout.clone(),
+        [WriteDescriptorSet::image_view_sampler(
+            0,
+            texture.clone(),
+            sampler.clone(),
+        )],
+    )
+        .unwrap();
+
+    let mut viewport = Viewport {
+        origin: [0.0, 0.0],
+        dimensions: [0.0, 0.0],
+        depth_range: 0.0..1.0,
+    };
+    let mut framebuffers = window_size_dependent_setup(&images, render_pass.clone(), &mut viewport);
+
+    let mut recreate_swapchain = false;
+    let mut previous_frame_end = Some(tex_future.boxed());
+
+    event_loop.run(move |event, _, control_flow| match event {
+        Event::WindowEvent {
+            event: WindowEvent::CloseRequested,
+            ..
+        } => {
+            *control_flow = ControlFlow::Exit;
+        }
+        Event::WindowEvent {
+            event: WindowEvent::Resized(_),
+            ..
+        } => {
+            recreate_swapchain = true;
+        }
+        Event::RedrawEventsCleared => {
+            previous_frame_end.as_mut().unwrap().cleanup_finished();
+
+            if recreate_swapchain {
+                let dimensions: [u32; 2] = surface.window().inner_size().into();
+                let (new_swapchain, new_images) =
+                    match swapchain.recreate().dimensions(dimensions).build() {
+                        Ok(r) => r,
+                        Err(SwapchainCreationError::UnsupportedDimensions) => return,
+                        Err(e) => panic!("Failed to recreate swapchain: {:?}", e),
+                    };
+
+                swapchain = new_swapchain;
+                framebuffers =
+                    window_size_dependent_setup(&new_images, render_pass.clone(), &mut viewport);
+                recreate_swapchain = false;
+            }
+
+            let (image_num, suboptimal, acquire_future) =
+                match swapchain::acquire_next_image(swapchain.clone(), None) {
+                    Ok(r) => r,
+                    Err(AcquireError::OutOfDate) => {
+                        recreate_swapchain = true;
+                        return;
+                    }
+                    Err(e) => panic!("Failed to acquire next image: {:?}", e),
+                };
+
+            if suboptimal {
+                recreate_swapchain = true;
+            }
+
+            let clear_values = vec![[0.0, 0.0, 1.0, 1.0].into()];
+            let mut builder = AutoCommandBufferBuilder::primary(
+                device.clone(),
+                queue.family(),
+                CommandBufferUsage::OneTimeSubmit,
+            )
+                .unwrap();
+            builder
+                .begin_render_pass(
+                    framebuffers[image_num].clone(),
+                    SubpassContents::Inline,
+                    clear_values,
+                )
+                .unwrap()
+                .set_viewport(0, [viewport.clone()])
+                .bind_pipeline_graphics(pipeline.clone())
+                .bind_descriptor_sets(
+                    PipelineBindPoint::Graphics,
+                    pipeline.layout().clone(),
+                    0,
+                    set.clone(),
+                )
+                .bind_vertex_buffers(0, vertex_buffer.clone())
+                .draw(vertex_buffer.len() as u32, 3, 0, 0)
+                .unwrap()
+                .end_render_pass()
+                .unwrap();
+            let command_buffer = builder.build().unwrap();
+
+            let future = previous_frame_end
+                .take()
+                .unwrap()
+                .join(acquire_future)
+                .then_execute(queue.clone(), command_buffer)
+                .unwrap()
+                .then_swapchain_present(queue.clone(), swapchain.clone(), image_num)
+                .then_signal_fence_and_flush();
+
+            match future {
+                Ok(future) => {
+                    previous_frame_end = Some(future.boxed());
+                }
+                Err(FlushError::OutOfDate) => {
+                    recreate_swapchain = true;
+                    previous_frame_end = Some(sync::now(device.clone()).boxed());
+                }
+                Err(e) => {
+                    println!("Failed to flush future: {:?}", e);
+                    previous_frame_end = Some(sync::now(device.clone()).boxed());
+                }
+            }
+        }
+        _ => (),
+    });
+}
+
+/// This method is called once during initialization, then again whenever the window is resized
+fn window_size_dependent_setup(
+    images: &[Arc<SwapchainImage<Window>>],
+    render_pass: Arc<RenderPass>,
+    viewport: &mut Viewport,
+) -> Vec<Arc<Framebuffer>> {
+    let dimensions = images[0].dimensions().width_height();
+    viewport.dimensions = [dimensions[0] as f32, dimensions[1] as f32];
+
+    images
+        .iter()
+        .map(|image| {
+            let view = ImageView::new(image.clone()).unwrap();
+            Framebuffer::start(render_pass.clone())
+                .add(view)
+                .unwrap()
+                .build()
+                .unwrap()
+        })
+        .collect::<Vec<_>>()
+}
+
+mod vs {
+    vulkano_shaders::shader! {
+        ty: "vertex",
+        src: "
+#version 450
+
+layout(location = 0) in vec2 position;
+layout(location = 0) out vec2 tex_coords;
+layout(location = 1) out uint layer;
+
+const float x[4] = float[](0.0, 0.0, 1.0, 1.0);
+const float y[4] = float[](0.0, 1.0, 0.0, 1.0);
+
+void main() {
+    gl_Position = vec4(position, 0.0, 1.0);
+    tex_coords = vec2(x[gl_VertexIndex], y[gl_VertexIndex]);
+    layer = gl_InstanceIndex;
+}"
+    }
+}
+
+mod fs {
+    vulkano_shaders::shader! {
+        ty: "fragment",
+        src: "
+#version 450
+
+layout(location = 0) in vec2 tex_coords;
+layout(location = 1) flat in uint layer;
+layout(location = 0) out vec4 f_color;
+
+layout(set = 0, binding = 0) uniform sampler2DArray tex;
+
+void main() {
+    f_color = texture(tex, vec3(tex_coords, layer));
+}"
+    }
+}