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render_to_egui_image.rs
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render_to_egui_image.rs
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use egui::load::SizedTexture;
use glam::{vec3, EulerRot, Mat4};
use {egui_miniquad as egui_mq, miniquad as mq};
struct Stage {
egui_mq: egui_mq::EguiMq,
offscreen_pipeline: mq::Pipeline,
offscreen_bind: mq::Bindings,
offscreen_pass: mq::RenderPass,
rx: f32,
ry: f32,
mq_ctx: Box<dyn mq::RenderingBackend>,
}
impl Stage {
pub fn new() -> Stage {
let mut mq_ctx = mq::window::new_rendering_backend();
let color_img = mq_ctx.new_render_texture(mq::TextureParams {
width: 256,
height: 256,
format: mq::TextureFormat::RGBA8,
..Default::default()
});
let depth_img = mq_ctx.new_render_texture(mq::TextureParams {
width: 256,
height: 256,
format: mq::TextureFormat::Depth,
..Default::default()
});
let offscreen_pass = mq_ctx.new_render_pass(color_img, Some(depth_img));
#[rustfmt::skip]
let vertices: &[f32] = &[
/* pos color uvs */
-1.0, -1.0, -1.0, 1.0, 0.5, 0.5, 1.0, 0.0, 0.0,
1.0, -1.0, -1.0, 1.0, 0.5, 0.5, 1.0, 1.0, 0.0,
1.0, 1.0, -1.0, 1.0, 0.5, 0.5, 1.0, 1.0, 1.0,
-1.0, 1.0, -1.0, 1.0, 0.5, 0.5, 1.0, 0.0, 1.0,
-1.0, -1.0, 1.0, 0.5, 1.0, 0.5, 1.0, 0.0, 0.0,
1.0, -1.0, 1.0, 0.5, 1.0, 0.5, 1.0, 1.0, 0.0,
1.0, 1.0, 1.0, 0.5, 1.0, 0.5, 1.0, 1.0, 1.0,
-1.0, 1.0, 1.0, 0.5, 1.0, 0.5, 1.0, 0.0, 1.0,
-1.0, -1.0, -1.0, 0.5, 0.5, 1.0, 1.0, 0.0, 0.0,
-1.0, 1.0, -1.0, 0.5, 0.5, 1.0, 1.0, 1.0, 0.0,
-1.0, 1.0, 1.0, 0.5, 0.5, 1.0, 1.0, 1.0, 1.0,
-1.0, -1.0, 1.0, 0.5, 0.5, 1.0, 1.0, 0.0, 1.0,
1.0, -1.0, -1.0, 1.0, 0.5, 0.0, 1.0, 0.0, 0.0,
1.0, 1.0, -1.0, 1.0, 0.5, 0.0, 1.0, 1.0, 0.0,
1.0, 1.0, 1.0, 1.0, 0.5, 0.0, 1.0, 1.0, 1.0,
1.0, -1.0, 1.0, 1.0, 0.5, 0.0, 1.0, 0.0, 1.0,
-1.0, -1.0, -1.0, 0.0, 0.5, 1.0, 1.0, 0.0, 0.0,
-1.0, -1.0, 1.0, 0.0, 0.5, 1.0, 1.0, 1.0, 0.0,
1.0, -1.0, 1.0, 0.0, 0.5, 1.0, 1.0, 1.0, 1.0,
1.0, -1.0, -1.0, 0.0, 0.5, 1.0, 1.0, 0.0, 1.0,
-1.0, 1.0, -1.0, 1.0, 0.0, 0.5, 1.0, 0.0, 0.0,
-1.0, 1.0, 1.0, 1.0, 0.0, 0.5, 1.0, 1.0, 0.0,
1.0, 1.0, 1.0, 1.0, 0.0, 0.5, 1.0, 1.0, 1.0,
1.0, 1.0, -1.0, 1.0, 0.0, 0.5, 1.0, 0.0, 1.0
];
let vertex_buffer = mq_ctx.new_buffer(
mq::BufferType::VertexBuffer,
mq::BufferUsage::Immutable,
mq::BufferSource::slice(vertices),
);
#[rustfmt::skip]
let indices: &[u16] = &[
0, 1, 2, 0, 2, 3,
6, 5, 4, 7, 6, 4,
8, 9, 10, 8, 10, 11,
14, 13, 12, 15, 14, 12,
16, 17, 18, 16, 18, 19,
22, 21, 20, 23, 22, 20
];
let index_buffer = mq_ctx.new_buffer(
mq::BufferType::IndexBuffer,
mq::BufferUsage::Immutable,
mq::BufferSource::slice(indices),
);
let offscreen_bind = mq::Bindings {
vertex_buffers: vec![vertex_buffer],
index_buffer,
images: vec![],
};
let offscreen_shader = mq_ctx
.new_shader(
mq::ShaderSource::Glsl {
vertex: offscreen_shader::VERTEX,
fragment: offscreen_shader::FRAGMENT,
},
offscreen_shader::meta(),
)
.unwrap();
let offscreen_pipeline = mq_ctx.new_pipeline(
&[mq::BufferLayout {
stride: 36,
..Default::default()
}],
&[
mq::VertexAttribute::new("pos", mq::VertexFormat::Float3),
mq::VertexAttribute::new("color0", mq::VertexFormat::Float4),
],
offscreen_shader,
mq::PipelineParams {
depth_test: mq::Comparison::LessOrEqual,
depth_write: true,
..Default::default()
},
);
Stage {
egui_mq: egui_mq::EguiMq::new(&mut *mq_ctx),
offscreen_pipeline,
offscreen_bind,
offscreen_pass,
rx: 0.,
ry: 0.,
mq_ctx,
}
}
}
impl mq::EventHandler for Stage {
fn update(&mut self) {}
fn draw(&mut self) {
let (width, height) = mq::window::screen_size();
let proj = Mat4::perspective_rh_gl(60.0f32.to_radians(), width / height, 0.01, 10.0);
let view = Mat4::look_at_rh(
vec3(0.0, 1.5, 3.0),
vec3(0.0, 0.0, 0.0),
vec3(0.0, 1.0, 0.0),
);
let view_proj = proj * view;
self.rx += 0.01;
self.ry += 0.03;
let model = Mat4::from_euler(EulerRot::YXZ, self.rx, self.ry, 0.);
let vs_params = offscreen_shader::Uniforms {
mvp: view_proj * model,
};
// the offscreen pass, rendering an rotating, untextured cube into a render target image
self.mq_ctx.begin_pass(
Some(self.offscreen_pass),
mq::PassAction::clear_color(1.0, 1.0, 1.0, 1.),
);
self.mq_ctx.apply_pipeline(&self.offscreen_pipeline);
self.mq_ctx.apply_bindings(&self.offscreen_bind);
self.mq_ctx
.apply_uniforms(mq::UniformsSource::table(&vs_params));
self.mq_ctx.draw(0, 36, 1);
self.mq_ctx.end_render_pass();
// Extract texture from offscreen render pass
let mq_texture = self.mq_ctx.render_pass_texture(self.offscreen_pass);
// create egui TextureId from Miniquad GL texture Id
let raw_id = match unsafe { self.mq_ctx.texture_raw_id(mq_texture) } {
mq::RawId::OpenGl(id) => id as u64,
};
let egui_texture_id = egui::TextureId::User(raw_id);
self.mq_ctx
.begin_default_pass(mq::PassAction::clear_color(0.0, 0.0, 0.0, 1.0));
self.mq_ctx.end_render_pass();
// Run the UI code:
self.egui_mq.run(&mut *self.mq_ctx, |_mq_ctx, egui_ctx| {
egui::Window::new("egui ❤ miniquad").show(egui_ctx, |ui| {
let img =
egui::Image::from_texture(SizedTexture::new(egui_texture_id, [140.0, 140.0]));
ui.add(img);
#[cfg(not(target_arch = "wasm32"))]
{
if ui.button("Quit").clicked() {
std::process::exit(0);
}
}
});
});
// Draw things behind egui here
self.egui_mq.draw(&mut *self.mq_ctx);
// Draw things in front of egui here
self.mq_ctx.commit_frame();
}
fn mouse_motion_event(&mut self, x: f32, y: f32) {
self.egui_mq.mouse_motion_event(x, y);
}
fn mouse_wheel_event(&mut self, dx: f32, dy: f32) {
self.egui_mq.mouse_wheel_event(dx, dy);
}
fn mouse_button_down_event(&mut self, mb: mq::MouseButton, x: f32, y: f32) {
self.egui_mq.mouse_button_down_event(mb, x, y);
}
fn mouse_button_up_event(&mut self, mb: mq::MouseButton, x: f32, y: f32) {
self.egui_mq.mouse_button_up_event(mb, x, y);
}
fn char_event(&mut self, character: char, _keymods: mq::KeyMods, _repeat: bool) {
self.egui_mq.char_event(character);
}
fn key_down_event(&mut self, keycode: mq::KeyCode, keymods: mq::KeyMods, _repeat: bool) {
self.egui_mq.key_down_event(keycode, keymods);
}
fn key_up_event(&mut self, keycode: mq::KeyCode, keymods: mq::KeyMods) {
self.egui_mq.key_up_event(keycode, keymods);
}
}
fn main() {
let conf = mq::conf::Conf {
high_dpi: true,
..Default::default()
};
mq::start(conf, || Box::new(Stage::new()));
}
mod offscreen_shader {
use miniquad as mq;
pub const VERTEX: &str = r#"#version 100
attribute vec4 pos;
attribute vec4 color0;
varying lowp vec4 color;
uniform mat4 mvp;
void main() {
gl_Position = mvp * pos;
color = color0;
}
"#;
pub const FRAGMENT: &str = r#"#version 100
varying lowp vec4 color;
void main() {
gl_FragColor = color;
}
"#;
pub fn meta() -> mq::ShaderMeta {
mq::ShaderMeta {
images: vec![],
uniforms: mq::UniformBlockLayout {
uniforms: vec![mq::UniformDesc::new("mvp", mq::UniformType::Mat4)],
},
}
}
#[repr(C)]
pub struct Uniforms {
pub mvp: glam::Mat4,
}
}