mirror of
https://github.com/vulkano-rs/vulkano.git
synced 2024-11-25 16:25:31 +00:00
561 lines
19 KiB
Rust
561 lines
19 KiB
Rust
// Some relevant documentation:
|
|
//
|
|
// - Tessellation overview https://www.khronos.org/opengl/wiki/Tessellation
|
|
// - Tessellation Control Shader https://www.khronos.org/opengl/wiki/Tessellation_Control_Shader
|
|
// - Tessellation Evaluation Shader https://www.khronos.org/opengl/wiki/Tessellation_Evaluation_Shader
|
|
// - Tessellation real-world usage 1 http://ogldev.atspace.co.uk/www/tutorial30/tutorial30.html
|
|
// - Tessellation real-world usage 2 https://prideout.net/blog/?p=48
|
|
|
|
// Notable elements of this example:
|
|
//
|
|
// - Usage of a tessellation control shader and a tessellation evaluation shader.
|
|
// - `tessellation_shaders` and `tessellation_state` are called on the pipeline builder.
|
|
// - The use of `PrimitiveTopology::PatchList`.
|
|
|
|
use std::{error::Error, sync::Arc};
|
|
use vulkano::{
|
|
buffer::{Buffer, BufferContents, BufferCreateInfo, BufferUsage},
|
|
command_buffer::{
|
|
allocator::StandardCommandBufferAllocator, CommandBufferBeginInfo, CommandBufferLevel,
|
|
CommandBufferUsage, RecordingCommandBuffer, RenderPassBeginInfo,
|
|
},
|
|
device::{
|
|
physical::PhysicalDeviceType, Device, DeviceCreateInfo, DeviceExtensions, DeviceFeatures,
|
|
QueueCreateInfo, QueueFlags,
|
|
},
|
|
image::{view::ImageView, Image, ImageUsage},
|
|
instance::{Instance, InstanceCreateFlags, InstanceCreateInfo},
|
|
memory::allocator::{AllocationCreateInfo, MemoryTypeFilter, StandardMemoryAllocator},
|
|
pipeline::{
|
|
graphics::{
|
|
color_blend::{ColorBlendAttachmentState, ColorBlendState},
|
|
input_assembly::{InputAssemblyState, PrimitiveTopology},
|
|
multisample::MultisampleState,
|
|
rasterization::{PolygonMode, RasterizationState},
|
|
tessellation::TessellationState,
|
|
vertex_input::{Vertex, VertexDefinition},
|
|
viewport::{Viewport, ViewportState},
|
|
GraphicsPipelineCreateInfo,
|
|
},
|
|
layout::PipelineDescriptorSetLayoutCreateInfo,
|
|
DynamicState, GraphicsPipeline, PipelineLayout, PipelineShaderStageCreateInfo,
|
|
},
|
|
render_pass::{Framebuffer, FramebufferCreateInfo, RenderPass, Subpass},
|
|
swapchain::{
|
|
acquire_next_image, Surface, Swapchain, SwapchainCreateInfo, SwapchainPresentInfo,
|
|
},
|
|
sync::{self, GpuFuture},
|
|
Validated, VulkanError, VulkanLibrary,
|
|
};
|
|
use winit::{
|
|
event::{Event, WindowEvent},
|
|
event_loop::{ControlFlow, EventLoop},
|
|
window::WindowBuilder,
|
|
};
|
|
|
|
mod vs {
|
|
vulkano_shaders::shader! {
|
|
ty: "vertex",
|
|
src: r"
|
|
#version 450
|
|
|
|
layout(location = 0) in vec2 position;
|
|
|
|
void main() {
|
|
gl_Position = vec4(position, 0.0, 1.0);
|
|
}
|
|
",
|
|
}
|
|
}
|
|
|
|
mod tcs {
|
|
vulkano_shaders::shader! {
|
|
ty: "tess_ctrl",
|
|
src: r"
|
|
#version 450
|
|
|
|
// A value of 3 means a patch consists of a single triangle.
|
|
layout(vertices = 3) out;
|
|
|
|
void main(void) {
|
|
// Save the position of the patch, so the TES can access it. We could define our
|
|
// own output variables for this, but `gl_out` is handily provided.
|
|
gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
|
|
|
|
// Many triangles are generated in the center.
|
|
gl_TessLevelInner[0] = 10;
|
|
// No triangles are generated for this edge.
|
|
gl_TessLevelOuter[0] = 1;
|
|
// Many triangles are generated for this edge.
|
|
gl_TessLevelOuter[1] = 10;
|
|
// Many triangles are generated for this edge.
|
|
gl_TessLevelOuter[2] = 10;
|
|
|
|
// These are only used when TES uses `layout(quads)`.
|
|
// gl_TessLevelInner[1] = ...;
|
|
// gl_TessLevelOuter[3] = ...;
|
|
}
|
|
",
|
|
}
|
|
}
|
|
|
|
// There is a stage in between TCS and TES called Primitive Generation (PG). Shaders cannot be
|
|
// defined for it. It takes `gl_TessLevelInner` and `gl_TessLevelOuter` and uses them to generate
|
|
// positions within the patch and pass them to TES via `gl_TessCoord`.
|
|
//
|
|
// When TES uses `layout(triangles)` then `gl_TessCoord` is in Barycentric coordinates. If
|
|
// `layout(quads)` is used then `gl_TessCoord` is in Cartesian coordinates. Barycentric coordinates
|
|
// are of the form (x, y, z) where x + y + z = 1 and the values x, y and z represent the distance
|
|
// from a vertex of the triangle.
|
|
// https://mathworld.wolfram.com/BarycentricCoordinates.html
|
|
|
|
mod tes {
|
|
vulkano_shaders::shader! {
|
|
ty: "tess_eval",
|
|
src: r"
|
|
#version 450
|
|
|
|
layout(triangles, equal_spacing, cw) in;
|
|
|
|
void main(void) {
|
|
// Retrieve the vertex positions set by the TCS.
|
|
vec4 vert_x = gl_in[0].gl_Position;
|
|
vec4 vert_y = gl_in[1].gl_Position;
|
|
vec4 vert_z = gl_in[2].gl_Position;
|
|
|
|
// Convert `gl_TessCoord` from Barycentric coordinates to Cartesian coordinates.
|
|
gl_Position = vec4(
|
|
gl_TessCoord.x * vert_x.x + gl_TessCoord.y * vert_y.x + gl_TessCoord.z * vert_z.x,
|
|
gl_TessCoord.x * vert_x.y + gl_TessCoord.y * vert_y.y + gl_TessCoord.z * vert_z.y,
|
|
gl_TessCoord.x * vert_x.z + gl_TessCoord.y * vert_y.z + gl_TessCoord.z * vert_z.z,
|
|
1.0
|
|
);
|
|
}
|
|
",
|
|
}
|
|
}
|
|
|
|
mod fs {
|
|
vulkano_shaders::shader! {
|
|
ty: "fragment",
|
|
src: r"
|
|
#version 450
|
|
|
|
layout(location = 0) out vec4 f_color;
|
|
|
|
void main() {
|
|
f_color = vec4(1.0, 1.0, 1.0, 1.0);
|
|
}
|
|
",
|
|
}
|
|
}
|
|
|
|
fn main() -> Result<(), impl Error> {
|
|
let event_loop = EventLoop::new().unwrap();
|
|
|
|
let library = VulkanLibrary::new().unwrap();
|
|
let required_extensions = Surface::required_extensions(&event_loop).unwrap();
|
|
let instance = Instance::new(
|
|
library,
|
|
InstanceCreateInfo {
|
|
flags: InstanceCreateFlags::ENUMERATE_PORTABILITY,
|
|
enabled_extensions: required_extensions,
|
|
..Default::default()
|
|
},
|
|
)
|
|
.unwrap();
|
|
|
|
let window = Arc::new(WindowBuilder::new().build(&event_loop).unwrap());
|
|
let surface = Surface::from_window(instance.clone(), window.clone()).unwrap();
|
|
|
|
let device_extensions = DeviceExtensions {
|
|
khr_swapchain: true,
|
|
..DeviceExtensions::empty()
|
|
};
|
|
let features = DeviceFeatures {
|
|
tessellation_shader: true,
|
|
fill_mode_non_solid: true,
|
|
..DeviceFeatures::empty()
|
|
};
|
|
let (physical_device, queue_family_index) = instance
|
|
.enumerate_physical_devices()
|
|
.unwrap()
|
|
.filter(|p| p.supported_extensions().contains(&device_extensions))
|
|
.filter(|p| p.supported_features().contains(&features))
|
|
.filter_map(|p| {
|
|
p.queue_family_properties()
|
|
.iter()
|
|
.enumerate()
|
|
.position(|(i, q)| {
|
|
q.queue_flags.intersects(QueueFlags::GRAPHICS)
|
|
&& p.surface_support(i as u32, &surface).unwrap_or(false)
|
|
})
|
|
.map(|i| (p, i as u32))
|
|
})
|
|
.min_by_key(|(p, _)| match p.properties().device_type {
|
|
PhysicalDeviceType::DiscreteGpu => 0,
|
|
PhysicalDeviceType::IntegratedGpu => 1,
|
|
PhysicalDeviceType::VirtualGpu => 2,
|
|
PhysicalDeviceType::Cpu => 3,
|
|
PhysicalDeviceType::Other => 4,
|
|
_ => 5,
|
|
})
|
|
.unwrap();
|
|
|
|
println!(
|
|
"Using device: {} (type: {:?})",
|
|
physical_device.properties().device_name,
|
|
physical_device.properties().device_type,
|
|
);
|
|
|
|
let (device, mut queues) = Device::new(
|
|
physical_device,
|
|
DeviceCreateInfo {
|
|
queue_create_infos: vec![QueueCreateInfo {
|
|
queue_family_index,
|
|
..Default::default()
|
|
}],
|
|
enabled_extensions: device_extensions,
|
|
enabled_features: features,
|
|
..Default::default()
|
|
},
|
|
)
|
|
.unwrap();
|
|
let queue = queues.next().unwrap();
|
|
|
|
let (mut swapchain, images) = {
|
|
let surface_capabilities = device
|
|
.physical_device()
|
|
.surface_capabilities(&surface, Default::default())
|
|
.unwrap();
|
|
let image_format = device
|
|
.physical_device()
|
|
.surface_formats(&surface, Default::default())
|
|
.unwrap()[0]
|
|
.0;
|
|
|
|
Swapchain::new(
|
|
device.clone(),
|
|
surface,
|
|
SwapchainCreateInfo {
|
|
min_image_count: surface_capabilities.min_image_count.max(2),
|
|
image_format,
|
|
image_extent: window.inner_size().into(),
|
|
image_usage: ImageUsage::COLOR_ATTACHMENT,
|
|
composite_alpha: surface_capabilities
|
|
.supported_composite_alpha
|
|
.into_iter()
|
|
.next()
|
|
.unwrap(),
|
|
..Default::default()
|
|
},
|
|
)
|
|
.unwrap()
|
|
};
|
|
|
|
let memory_allocator = Arc::new(StandardMemoryAllocator::new_default(device.clone()));
|
|
|
|
#[derive(BufferContents, Vertex)]
|
|
#[repr(C)]
|
|
struct Vertex {
|
|
#[format(R32G32_SFLOAT)]
|
|
position: [f32; 2],
|
|
}
|
|
|
|
let vertices = [
|
|
Vertex {
|
|
position: [-0.5, -0.25],
|
|
},
|
|
Vertex {
|
|
position: [0.0, 0.5],
|
|
},
|
|
Vertex {
|
|
position: [0.25, -0.1],
|
|
},
|
|
Vertex {
|
|
position: [0.9, 0.9],
|
|
},
|
|
Vertex {
|
|
position: [0.9, 0.8],
|
|
},
|
|
Vertex {
|
|
position: [0.8, 0.8],
|
|
},
|
|
Vertex {
|
|
position: [-0.9, 0.9],
|
|
},
|
|
Vertex {
|
|
position: [-0.7, 0.6],
|
|
},
|
|
Vertex {
|
|
position: [-0.5, 0.9],
|
|
},
|
|
];
|
|
let vertex_buffer = Buffer::from_iter(
|
|
memory_allocator,
|
|
BufferCreateInfo {
|
|
usage: BufferUsage::VERTEX_BUFFER,
|
|
..Default::default()
|
|
},
|
|
AllocationCreateInfo {
|
|
memory_type_filter: MemoryTypeFilter::PREFER_DEVICE
|
|
| MemoryTypeFilter::HOST_SEQUENTIAL_WRITE,
|
|
..Default::default()
|
|
},
|
|
vertices,
|
|
)
|
|
.unwrap();
|
|
|
|
let render_pass = vulkano::single_pass_renderpass!(
|
|
device.clone(),
|
|
attachments: {
|
|
color: {
|
|
format: swapchain.image_format(),
|
|
samples: 1,
|
|
load_op: Clear,
|
|
store_op: Store,
|
|
},
|
|
},
|
|
pass: {
|
|
color: [color],
|
|
depth_stencil: {},
|
|
},
|
|
)
|
|
.unwrap();
|
|
|
|
let pipeline = {
|
|
let vs = vs::load(device.clone())
|
|
.unwrap()
|
|
.entry_point("main")
|
|
.unwrap();
|
|
let tcs = tcs::load(device.clone())
|
|
.unwrap()
|
|
.entry_point("main")
|
|
.unwrap();
|
|
let tes = tes::load(device.clone())
|
|
.unwrap()
|
|
.entry_point("main")
|
|
.unwrap();
|
|
let fs = fs::load(device.clone())
|
|
.unwrap()
|
|
.entry_point("main")
|
|
.unwrap();
|
|
let vertex_input_state = Vertex::per_vertex()
|
|
.definition(&vs.info().input_interface)
|
|
.unwrap();
|
|
let stages = [
|
|
PipelineShaderStageCreateInfo::new(vs),
|
|
PipelineShaderStageCreateInfo::new(tcs),
|
|
PipelineShaderStageCreateInfo::new(tes),
|
|
PipelineShaderStageCreateInfo::new(fs),
|
|
];
|
|
let layout = PipelineLayout::new(
|
|
device.clone(),
|
|
PipelineDescriptorSetLayoutCreateInfo::from_stages(&stages)
|
|
.into_pipeline_layout_create_info(device.clone())
|
|
.unwrap(),
|
|
)
|
|
.unwrap();
|
|
let subpass = Subpass::from(render_pass.clone(), 0).unwrap();
|
|
|
|
GraphicsPipeline::new(
|
|
device.clone(),
|
|
None,
|
|
GraphicsPipelineCreateInfo {
|
|
stages: stages.into_iter().collect(),
|
|
vertex_input_state: Some(vertex_input_state),
|
|
input_assembly_state: Some(InputAssemblyState {
|
|
topology: PrimitiveTopology::PatchList,
|
|
..Default::default()
|
|
}),
|
|
tessellation_state: Some(TessellationState {
|
|
// Use a patch_control_points of 3, because we want to convert one *triangle*
|
|
// into lots of little ones.
|
|
// A value of 4 would convert a *rectangle* into lots of little triangles.
|
|
patch_control_points: 3,
|
|
..Default::default()
|
|
}),
|
|
viewport_state: Some(ViewportState::default()),
|
|
rasterization_state: Some(RasterizationState {
|
|
polygon_mode: PolygonMode::Line,
|
|
..Default::default()
|
|
}),
|
|
multisample_state: Some(MultisampleState::default()),
|
|
color_blend_state: Some(ColorBlendState::with_attachment_states(
|
|
subpass.num_color_attachments(),
|
|
ColorBlendAttachmentState::default(),
|
|
)),
|
|
dynamic_state: [DynamicState::Viewport].into_iter().collect(),
|
|
subpass: Some(subpass.into()),
|
|
..GraphicsPipelineCreateInfo::layout(layout)
|
|
},
|
|
)
|
|
.unwrap()
|
|
};
|
|
|
|
let mut recreate_swapchain = false;
|
|
let mut previous_frame_end = Some(sync::now(device.clone()).boxed());
|
|
let mut viewport = Viewport {
|
|
offset: [0.0, 0.0],
|
|
extent: [0.0, 0.0],
|
|
depth_range: 0.0..=1.0,
|
|
};
|
|
let mut framebuffers = window_size_dependent_setup(&images, render_pass.clone(), &mut viewport);
|
|
|
|
let command_buffer_allocator = Arc::new(StandardCommandBufferAllocator::new(
|
|
device.clone(),
|
|
Default::default(),
|
|
));
|
|
|
|
event_loop.run(move |event, elwt| {
|
|
elwt.set_control_flow(ControlFlow::Poll);
|
|
|
|
match event {
|
|
Event::WindowEvent {
|
|
event: WindowEvent::CloseRequested,
|
|
..
|
|
} => {
|
|
elwt.exit();
|
|
}
|
|
Event::WindowEvent {
|
|
event: WindowEvent::Resized(_),
|
|
..
|
|
} => {
|
|
recreate_swapchain = true;
|
|
}
|
|
Event::WindowEvent {
|
|
event: WindowEvent::RedrawRequested,
|
|
..
|
|
} => {
|
|
let image_extent: [u32; 2] = window.inner_size().into();
|
|
|
|
if image_extent.contains(&0) {
|
|
return;
|
|
}
|
|
|
|
previous_frame_end.as_mut().unwrap().cleanup_finished();
|
|
|
|
if recreate_swapchain {
|
|
let (new_swapchain, new_images) = swapchain
|
|
.recreate(SwapchainCreateInfo {
|
|
image_extent,
|
|
..swapchain.create_info()
|
|
})
|
|
.expect("failed to recreate swapchain");
|
|
|
|
swapchain = new_swapchain;
|
|
framebuffers = window_size_dependent_setup(
|
|
&new_images,
|
|
render_pass.clone(),
|
|
&mut viewport,
|
|
);
|
|
recreate_swapchain = false;
|
|
}
|
|
|
|
let (image_index, suboptimal, acquire_future) =
|
|
match acquire_next_image(swapchain.clone(), None).map_err(Validated::unwrap) {
|
|
Ok(r) => r,
|
|
Err(VulkanError::OutOfDate) => {
|
|
recreate_swapchain = true;
|
|
return;
|
|
}
|
|
Err(e) => panic!("failed to acquire next image: {e}"),
|
|
};
|
|
|
|
if suboptimal {
|
|
recreate_swapchain = true;
|
|
}
|
|
|
|
let mut builder = RecordingCommandBuffer::new(
|
|
command_buffer_allocator.clone(),
|
|
queue.queue_family_index(),
|
|
CommandBufferLevel::Primary,
|
|
CommandBufferBeginInfo {
|
|
usage: CommandBufferUsage::OneTimeSubmit,
|
|
..Default::default()
|
|
},
|
|
)
|
|
.unwrap();
|
|
|
|
builder
|
|
.begin_render_pass(
|
|
RenderPassBeginInfo {
|
|
clear_values: vec![Some([0.0, 0.0, 0.0, 1.0].into())],
|
|
..RenderPassBeginInfo::framebuffer(
|
|
framebuffers[image_index as usize].clone(),
|
|
)
|
|
},
|
|
Default::default(),
|
|
)
|
|
.unwrap()
|
|
.set_viewport(0, [viewport.clone()].into_iter().collect())
|
|
.unwrap()
|
|
.bind_pipeline_graphics(pipeline.clone())
|
|
.unwrap()
|
|
.bind_vertex_buffers(0, vertex_buffer.clone())
|
|
.unwrap();
|
|
|
|
unsafe {
|
|
builder.draw(vertex_buffer.len() as u32, 1, 0, 0).unwrap();
|
|
}
|
|
|
|
builder.end_render_pass(Default::default()).unwrap();
|
|
|
|
let command_buffer = builder.end().unwrap();
|
|
let future = previous_frame_end
|
|
.take()
|
|
.unwrap()
|
|
.join(acquire_future)
|
|
.then_execute(queue.clone(), command_buffer)
|
|
.unwrap()
|
|
.then_swapchain_present(
|
|
queue.clone(),
|
|
SwapchainPresentInfo::swapchain_image_index(swapchain.clone(), image_index),
|
|
)
|
|
.then_signal_fence_and_flush();
|
|
|
|
match future.map_err(Validated::unwrap) {
|
|
Ok(future) => {
|
|
previous_frame_end = Some(future.boxed());
|
|
}
|
|
Err(VulkanError::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());
|
|
}
|
|
}
|
|
}
|
|
Event::AboutToWait => window.request_redraw(),
|
|
_ => (),
|
|
}
|
|
})
|
|
}
|
|
|
|
/// This function is called once during initialization, then again whenever the window is resized.
|
|
fn window_size_dependent_setup(
|
|
images: &[Arc<Image>],
|
|
render_pass: Arc<RenderPass>,
|
|
viewport: &mut Viewport,
|
|
) -> Vec<Arc<Framebuffer>> {
|
|
let extent = images[0].extent();
|
|
viewport.extent = [extent[0] as f32, extent[1] as f32];
|
|
|
|
images
|
|
.iter()
|
|
.map(|image| {
|
|
let view = ImageView::new_default(image.clone()).unwrap();
|
|
Framebuffer::new(
|
|
render_pass.clone(),
|
|
FramebufferCreateInfo {
|
|
attachments: vec![view],
|
|
..Default::default()
|
|
},
|
|
)
|
|
.unwrap()
|
|
})
|
|
.collect::<Vec<_>>()
|
|
}
|