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#![cfg_attr(feature = "cargo-clippy", allow(redundant_field_names))]
extern crate nuklear;
#[macro_use]
extern crate glium;
use nuklear::{Buffer, Context, ConvertConfig, DrawVertexLayoutAttribute, DrawVertexLayoutElements, DrawVertexLayoutFormat, Handle, Vec2};
#[derive(Debug, Copy, Clone)]
struct Vertex {
pos: Vec2,
tex: Vec2,
col: [u8; 4],
}
impl glium::vertex::Vertex for Vertex {
fn build_bindings() -> glium::vertex::VertexFormat {
use std::mem::transmute;
unsafe {
let dummy: &Vertex = ::std::mem::transmute(0usize);
::std::borrow::Cow::Owned(vec![
("Position".into(), transmute(&dummy.pos), <(f32, f32) as glium::vertex::Attribute>::get_type(), false),
("TexCoord".into(), transmute(&dummy.tex), <(f32, f32) as glium::vertex::Attribute>::get_type(), false),
("Color".into(), transmute(&dummy.col), glium::vertex::AttributeType::U8U8U8U8, false),
])
}
}
}
impl Default for Vertex {
fn default() -> Self {
unsafe { ::std::mem::zeroed() }
}
}
const VS: &str = "#version 150
uniform mat4 ProjMtx;
in vec2 Position;
in vec2 TexCoord;
in vec4 Color;
out vec2 Frag_UV;
out vec4 Frag_Color;
void main() {
Frag_UV = \
TexCoord;
Frag_Color = Color / 255.0;
gl_Position = ProjMtx * vec4(Position.xy, 0, 1);
}";
const FS: &str = "#version 150
precision mediump float;
uniform sampler2D Texture;
in vec2 Frag_UV;
in vec4 Frag_Color;
out vec4 Out_Color;
void main(){
Out_Color = Frag_Color * \
texture(Texture, Frag_UV.st);
}";
pub struct Drawer {
cmd: Buffer,
prg: glium::Program,
tex: Vec<glium::Texture2d>,
vbf: Vec<Vertex>,
ebf: Vec<u16>,
vbo: glium::VertexBuffer<Vertex>,
ebo: glium::IndexBuffer<u16>,
vle: DrawVertexLayoutElements,
}
impl Drawer {
pub fn new(display: &mut glium::Display, texture_count: usize, vbo_size: usize, ebo_size: usize, command_buffer: Buffer) -> Drawer {
Drawer {
cmd: command_buffer,
prg: glium::Program::from_source(display, VS, FS, None).unwrap(),
tex: Vec::with_capacity(texture_count + 1),
vbf: vec![Vertex::default(); vbo_size * ::std::mem::size_of::<Vertex>()],
ebf: vec![0u16; ebo_size * ::std::mem::size_of::<u16>()],
vbo: glium::VertexBuffer::empty_dynamic(display, vbo_size * ::std::mem::size_of::<Vertex>()).unwrap(),
ebo: glium::IndexBuffer::empty_dynamic(display, glium::index::PrimitiveType::TrianglesList, ebo_size * ::std::mem::size_of::<u16>()).unwrap(),
vle: DrawVertexLayoutElements::new(&[
(DrawVertexLayoutAttribute::NK_VERTEX_POSITION, DrawVertexLayoutFormat::NK_FORMAT_FLOAT, 0),
(DrawVertexLayoutAttribute::NK_VERTEX_TEXCOORD, DrawVertexLayoutFormat::NK_FORMAT_FLOAT, 8),
(DrawVertexLayoutAttribute::NK_VERTEX_COLOR, DrawVertexLayoutFormat::NK_FORMAT_R8G8B8A8, 16),
(DrawVertexLayoutAttribute::NK_VERTEX_ATTRIBUTE_COUNT, DrawVertexLayoutFormat::NK_FORMAT_COUNT, 32),
]),
}
}
pub fn add_texture(&mut self, display: &mut glium::Display, image: &[u8], width: u32, height: u32) -> Handle {
let image = glium::texture::RawImage2d {
data: std::borrow::Cow::Borrowed(image),
width: width,
height: height,
format: glium::texture::ClientFormat::U8U8U8U8,
};
let tex = glium::Texture2d::new(display, image).unwrap();
let hnd = Handle::from_id(self.tex.len() as i32 + 1);
self.tex.push(tex);
hnd
}
pub fn draw(&mut self, ctx: &mut Context, cfg: &mut ConvertConfig, frame: &mut glium::Frame, scale: Vec2) {
use glium::uniforms::MagnifySamplerFilter;
use glium::Surface;
use glium::{Blend, DrawParameters, Rect};
let (ww, hh) = frame.get_dimensions();
let ortho = [
[2.0f32 / ww as f32, 0.0f32, 0.0f32, 0.0f32],
[0.0f32, -2.0f32 / hh as f32, 0.0f32, 0.0f32],
[0.0f32, 0.0f32, -1.0f32, 0.0f32],
[-1.0f32, 1.0f32, 0.0f32, 1.0f32],
];
cfg.set_vertex_layout(&self.vle);
cfg.set_vertex_size(::std::mem::size_of::<Vertex>());
{
self.vbo.invalidate();
self.ebo.invalidate();
let mut rvbuf = unsafe { ::std::slice::from_raw_parts_mut(self.vbf.as_mut() as *mut [Vertex] as *mut u8, self.vbf.capacity()) };
let mut rebuf = unsafe { ::std::slice::from_raw_parts_mut(self.ebf.as_mut() as *mut [u16] as *mut u8, self.ebf.capacity()) };
let mut vbuf = Buffer::with_fixed(&mut rvbuf);
let mut ebuf = Buffer::with_fixed(&mut rebuf);
ctx.convert(&mut self.cmd, &mut vbuf, &mut ebuf, &cfg);
self.vbo.slice_mut(0..self.vbf.capacity()).unwrap().write(&self.vbf);
self.ebo.slice_mut(0..self.ebf.capacity()).unwrap().write(&self.ebf);
}
let mut idx_start = 0;
let mut idx_end;
for cmd in ctx.draw_command_iterator(&self.cmd) {
if cmd.elem_count() < 1 {
continue;
}
let id = cmd.texture().id().unwrap();
let ptr = self.find_res(id).unwrap();
idx_end = idx_start + cmd.elem_count() as usize;
let x = cmd.clip_rect().x * scale.x;
let y = cmd.clip_rect().y * scale.y;
let w = cmd.clip_rect().w * scale.x;
let h = cmd.clip_rect().h * scale.y;
frame
.draw(
&self.vbo,
&self.ebo.slice(idx_start..idx_end).unwrap(),
&self.prg,
&uniform! {
ProjMtx: ortho,
Texture: ptr.sampled().magnify_filter(MagnifySamplerFilter::Linear),
},
&DrawParameters {
blend: Blend::alpha_blending(),
scissor: Some(Rect {
left: (if x < 0f32 { 0f32 } else { x }) as u32,
bottom: (if y < 0f32 { 0f32 } else { hh as f32 - y - h }) as u32,
width: (if x < 0f32 { w + x } else { w }) as u32,
height: (if y < 0f32 { h + y } else { h }) as u32,
}),
backface_culling: glium::draw_parameters::BackfaceCullingMode::CullingDisabled,
..DrawParameters::default()
},
)
.unwrap();
idx_start = idx_end;
}
}
fn find_res(&self, id: i32) -> Option<&glium::Texture2d> {
if id > 0 && id as usize <= self.tex.len() {
Some(&self.tex[(id - 1) as usize])
} else {
None
}
}
}