mod shader;
use vulkano::{buffer::{BufferAccess, BufferUsage, CpuBufferPool}, command_buffer::{PrimaryAutoCommandBuffer, SubpassContents}, image::{ImageDimensions, ImageViewAbstract, view::ImageView}, render_pass::RenderPass};
use vulkano::command_buffer::{AutoCommandBufferBuilder, DynamicState};
use vulkano::descriptor::descriptor_set::PersistentDescriptorSet;
use vulkano::device::{Device, Queue};
use vulkano::pipeline::{GraphicsPipeline, GraphicsPipelineAbstract};
use vulkano::sync::GpuFuture;
use vulkano::image::ImmutableImage;
use vulkano::sampler::Sampler;
use vulkano::format::{Format, ClearValue};
use vulkano::render_pass::Subpass;
use vulkano::render_pass::Framebuffer;
use vulkano::pipeline::viewport::Scissor;
use vulkano::pipeline::viewport::Viewport;
use std::sync::Arc;
use std::fmt;
use imgui::{DrawVert, Textures, DrawCmd, DrawCmdParams, internal::RawWrapper, TextureId, ImString};
#[derive(Default, Debug, Clone)]
#[repr(C)]
struct Vertex {
pub pos: [f32; 2],
pub uv : [f32; 2],
pub col: u32,
}
vulkano::impl_vertex!(Vertex, pos, uv, col);
impl From<DrawVert> for Vertex {
fn from(v : DrawVert) -> Vertex {
unsafe{std::mem::transmute(v)}
}
}
#[derive(Debug)]
pub enum RendererError {
BadTexture(TextureId),
BadImageDimensions(ImageDimensions),
}
impl fmt::Display for RendererError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
&Self::BadTexture(ref t) => {
write!(f, "The Texture ID could not be found: {:?}", t)
},
&Self::BadImageDimensions(d) => {
write!(f, "Image Dimensions not supported (must be Dim2d): {:?}", d)
},
}
}
}
impl std::error::Error for RendererError {}
pub type Texture = (Arc<dyn ImageViewAbstract + Send + Sync>, Arc<Sampler>);
pub struct Renderer {
render_pass : Arc<RenderPass>,
pipeline : Arc<dyn GraphicsPipelineAbstract + Send + Sync>,
font_texture : Texture,
textures : Textures<Texture>,
vrt_buffer_pool : CpuBufferPool<Vertex>,
idx_buffer_pool : CpuBufferPool<u16>,
transform_buffer_pool : CpuBufferPool<[[f32; 4]; 4]>,
}
impl Renderer {
pub fn init(ctx: &mut imgui::Context, device : Arc<Device>, queue : Arc<Queue>, format : Format) -> Result<Renderer, Box<dyn std::error::Error>> {
let vs = shader::vs::Shader::load(device.clone()).unwrap();
let fs = shader::fs::Shader::load(device.clone()).unwrap();
let render_pass = Arc::new(
vulkano::single_pass_renderpass!(
device.clone(),
attachments: {
color: {
load: Load,
store: Store,
format: format,
samples: 1,
}
},
pass: {
color: [color],
depth_stencil: {}
}
)
.unwrap(),
);
let pipeline = Arc::new(GraphicsPipeline::start()
.vertex_input_single_buffer::<Vertex>()
.vertex_shader(vs.main_entry_point(), ())
.triangle_list()
.viewports_scissors_dynamic(1)
.fragment_shader(fs.main_entry_point(), ())
.blend_alpha_blending()
.render_pass(Subpass::from(render_pass.clone(), 0).unwrap())
.build(device.clone())?);
let textures = Textures::new();
let font_texture = Self::upload_font_texture(ctx.fonts(), device.clone(), queue.clone())?;
ctx.set_renderer_name(Some(ImString::from(format!("imgui-vulkano-renderer {}", env!("CARGO_PKG_VERSION")))));
let vrt_buffer_pool = CpuBufferPool::new(device.clone(), BufferUsage::vertex_buffer_transfer_destination());
let idx_buffer_pool = CpuBufferPool::new(device.clone(), BufferUsage::index_buffer_transfer_destination());
let transform_buffer_pool = CpuBufferPool::new(device.clone(), BufferUsage::uniform_buffer_transfer_destination());
Ok(Renderer {
render_pass,
pipeline : pipeline as Arc<dyn GraphicsPipelineAbstract + Send + Sync>,
font_texture,
textures,
vrt_buffer_pool,
idx_buffer_pool,
transform_buffer_pool,
})
}
pub fn draw_commands<I>(&mut self, cmd_buf_builder : &mut AutoCommandBufferBuilder<PrimaryAutoCommandBuffer>, _queue : Arc<Queue>, target : I, draw_data : &imgui::DrawData) -> Result<(), Box<dyn std::error::Error>>
where I: ImageViewAbstract + Send + Sync + 'static {
let fb_width = draw_data.display_size[0] * draw_data.framebuffer_scale[0];
let fb_height = draw_data.display_size[1] * draw_data.framebuffer_scale[1];
if !(fb_width > 0.0 && fb_height > 0.0) {
return Ok(());
}
let left = draw_data.display_pos[0];
let right = draw_data.display_pos[0] + draw_data.display_size[0];
let top = draw_data.display_pos[1];
let bottom = draw_data.display_pos[1] + draw_data.display_size[1];
let transform = self.transform_buffer_pool.next(
[
[(2.0 / (right - left)), 0.0, 0.0, 0.0],
[0.0, (2.0 / (bottom - top)), 0.0, 0.0],
[0.0, 0.0, -1.0, 0.0],
[
(right + left) / (left - right),
(top + bottom) / (top - bottom),
0.0,
1.0,
],
]
).unwrap();
let dims = match target.image().dimensions() {
ImageDimensions::Dim2d {width, height, ..} => {[width, height]},
d => { return Err(Box::new(RendererError::BadImageDimensions(d)));}
};
let mut dynamic_state = DynamicState::default();
dynamic_state.viewports = Some(vec![
Viewport {
origin: [0.0, 0.0],
dimensions: [dims[0] as f32, dims[1] as f32],
depth_range: 0.0 .. 1.0,
}
]);
dynamic_state.scissors = Some(vec![
Scissor::default()
]);
let clip_off = draw_data.display_pos;
let clip_scale = draw_data.framebuffer_scale;
let layout = self.pipeline.layout().descriptor_set_layout(0).unwrap();
let framebuffer = Arc::new(Framebuffer::start(self.render_pass.clone())
.add(target)?.build()?);
cmd_buf_builder.begin_render_pass(framebuffer, SubpassContents::Inline, vec![ClearValue::None])?;
for draw_list in draw_data.draw_lists() {
let vertex_buffer = Arc::new(self.vrt_buffer_pool.chunk(draw_list.vtx_buffer().iter().map(|&v| Vertex::from(v))).unwrap());
let index_buffer = Arc::new(self.idx_buffer_pool.chunk(draw_list.idx_buffer().iter().cloned()).unwrap());
for cmd in draw_list.commands() {
match cmd {
DrawCmd::Elements {
count,
cmd_params:
DrawCmdParams {
clip_rect,
texture_id,
idx_offset,
..
},
} => {
let clip_rect = [
(clip_rect[0] - clip_off[0]) * clip_scale[0],
(clip_rect[1] - clip_off[1]) * clip_scale[1],
(clip_rect[2] - clip_off[0]) * clip_scale[0],
(clip_rect[3] - clip_off[1]) * clip_scale[1],
];
if clip_rect[0] < fb_width
&& clip_rect[1] < fb_height
&& clip_rect[2] >= 0.0
&& clip_rect[3] >= 0.0
{
if let Some(ref mut scissors) = dynamic_state.scissors {
scissors[0] = Scissor {
origin: [
f32::max(0.0, clip_rect[0]).floor() as i32,
f32::max(0.0, clip_rect[1]).floor() as i32
],
dimensions: [
(clip_rect[2] - clip_rect[0]).abs().ceil() as u32,
(clip_rect[3] - clip_rect[1]).abs().ceil() as u32
],
};
}
let tex = self.lookup_texture(texture_id)?;
let set = Arc::new(PersistentDescriptorSet::start(layout.clone())
.add_buffer(transform.clone())?
.add_sampled_image(tex.0.clone(), tex.1.clone())?
.build()?
);
cmd_buf_builder.draw_indexed(
self.pipeline.clone(),
&dynamic_state,
vec![vertex_buffer.clone()],
index_buffer.clone().into_buffer_slice().slice(idx_offset..(idx_offset+count)).unwrap(),
set,
(),
vec![])?;
}
}
DrawCmd::ResetRenderState => (), DrawCmd::RawCallback { callback, raw_cmd } => unsafe {
callback(draw_list.raw(), raw_cmd)
},
}
}
}
cmd_buf_builder.end_render_pass()?;
Ok(())
}
pub fn reload_font_texture(
&mut self,
ctx: &mut imgui::Context,
device : Arc<Device>,
queue : Arc<Queue>,
) -> Result<(), Box<dyn std::error::Error>> {
self.font_texture = Self::upload_font_texture(ctx.fonts(), device, queue)?;
Ok(())
}
pub fn textures(&mut self) -> &mut Textures<Texture> {
&mut self.textures
}
fn upload_font_texture(
mut fonts: imgui::FontAtlasRefMut,
device : Arc<Device>,
queue : Arc<Queue>,
) -> Result<Texture, Box<dyn std::error::Error>> {
let texture = fonts.build_rgba32_texture();
let (image, fut) = ImmutableImage::from_iter(
texture.data.iter().cloned(),
ImageDimensions::Dim2d{
width : texture.width,
height : texture.height,
array_layers : 1,
},
vulkano::image::MipmapsCount::One,
Format::R8G8B8A8Srgb,
queue.clone(),
)?;
fut.then_signal_fence_and_flush()?
.wait(None)?;
let sampler = Sampler::simple_repeat_linear(device.clone());
fonts.tex_id = TextureId::from(usize::MAX);
Ok((ImageView::new(image)?, sampler))
}
fn lookup_texture(&self, texture_id: TextureId) -> Result<&Texture, RendererError> {
if texture_id.id() == usize::MAX {
Ok(&self.font_texture)
} else if let Some(texture) = self.textures.get(texture_id) {
Ok(texture)
} else {
Err(RendererError::BadTexture(texture_id))
}
}
}