Source code
Revision control
Copy as Markdown
Other Tools
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
extern crate gleam;
extern crate glutin;
extern crate webrender;
extern crate winit;
#[path = "common/boilerplate.rs"]
mod boilerplate;
use crate::boilerplate::Example;
use gleam::gl;
use webrender::api::*;
use webrender::render_api::*;
use webrender::api::units::*;
fn init_gl_texture(
id: gl::GLuint,
internal: gl::GLenum,
external: gl::GLenum,
bytes: &[u8],
gl: &dyn gl::Gl,
) {
gl.bind_texture(gl::TEXTURE_2D, id);
gl.tex_parameter_i(gl::TEXTURE_2D, gl::TEXTURE_MAG_FILTER, gl::LINEAR as gl::GLint);
gl.tex_parameter_i(gl::TEXTURE_2D, gl::TEXTURE_MIN_FILTER, gl::LINEAR as gl::GLint);
gl.tex_parameter_i(gl::TEXTURE_2D, gl::TEXTURE_WRAP_S, gl::CLAMP_TO_EDGE as gl::GLint);
gl.tex_parameter_i(gl::TEXTURE_2D, gl::TEXTURE_WRAP_T, gl::CLAMP_TO_EDGE as gl::GLint);
gl.tex_image_2d(
gl::TEXTURE_2D,
0,
internal as gl::GLint,
100,
100,
0,
external,
gl::UNSIGNED_BYTE,
Some(bytes),
);
gl.bind_texture(gl::TEXTURE_2D, 0);
}
struct YuvImageProvider {
texture_ids: Vec<gl::GLuint>,
}
impl YuvImageProvider {
fn new(gl: &dyn gl::Gl) -> Self {
let texture_ids = gl.gen_textures(4);
init_gl_texture(texture_ids[0], gl::RED, gl::RED, &[127; 100 * 100], gl);
init_gl_texture(texture_ids[1], gl::RG8, gl::RG, &[0; 100 * 100 * 2], gl);
init_gl_texture(texture_ids[2], gl::RED, gl::RED, &[127; 100 * 100], gl);
init_gl_texture(texture_ids[3], gl::RED, gl::RED, &[127; 100 * 100], gl);
YuvImageProvider {
texture_ids
}
}
}
impl ExternalImageHandler for YuvImageProvider {
fn lock(
&mut self,
key: ExternalImageId,
_channel_index: u8,
) -> ExternalImage {
let id = self.texture_ids[key.0 as usize];
ExternalImage {
uv: TexelRect::new(0.0, 0.0, 1.0, 1.0),
source: ExternalImageSource::NativeTexture(id),
}
}
fn unlock(&mut self, _key: ExternalImageId, _channel_index: u8) {
}
}
struct App {
texture_id: gl::GLuint,
current_value: u8,
}
impl Example for App {
fn render(
&mut self,
api: &mut RenderApi,
builder: &mut DisplayListBuilder,
txn: &mut Transaction,
_device_size: DeviceIntSize,
pipeline_id: PipelineId,
_document_id: DocumentId,
) {
let bounds = LayoutRect::from_size(LayoutSize::new(500.0, 500.0));
let space_and_clip = SpaceAndClipInfo::root_scroll(pipeline_id);
builder.push_simple_stacking_context(
bounds.min,
space_and_clip.spatial_id,
PrimitiveFlags::IS_BACKFACE_VISIBLE,
);
let yuv_chanel1 = api.generate_image_key();
let yuv_chanel2 = api.generate_image_key();
let yuv_chanel2_1 = api.generate_image_key();
let yuv_chanel3 = api.generate_image_key();
txn.add_image(
yuv_chanel1,
ImageDescriptor::new(100, 100, ImageFormat::R8, ImageDescriptorFlags::IS_OPAQUE),
ImageData::External(ExternalImageData {
id: ExternalImageId(0),
channel_index: 0,
image_type: ExternalImageType::TextureHandle(
ImageBufferKind::Texture2D,
),
normalized_uvs: false,
}),
None,
);
txn.add_image(
yuv_chanel2,
ImageDescriptor::new(100, 100, ImageFormat::RG8, ImageDescriptorFlags::IS_OPAQUE),
ImageData::External(ExternalImageData {
id: ExternalImageId(1),
channel_index: 0,
image_type: ExternalImageType::TextureHandle(
ImageBufferKind::Texture2D,
),
normalized_uvs: false,
}),
None,
);
txn.add_image(
yuv_chanel2_1,
ImageDescriptor::new(100, 100, ImageFormat::R8, ImageDescriptorFlags::IS_OPAQUE),
ImageData::External(ExternalImageData {
id: ExternalImageId(2),
channel_index: 0,
image_type: ExternalImageType::TextureHandle(
ImageBufferKind::Texture2D,
),
normalized_uvs: false,
}),
None,
);
txn.add_image(
yuv_chanel3,
ImageDescriptor::new(100, 100, ImageFormat::R8, ImageDescriptorFlags::IS_OPAQUE),
ImageData::External(ExternalImageData {
id: ExternalImageId(3),
channel_index: 0,
image_type: ExternalImageType::TextureHandle(
ImageBufferKind::Texture2D,
),
normalized_uvs: false,
}),
None,
);
let info = CommonItemProperties::new(
LayoutRect::from_origin_and_size(LayoutPoint::new(100.0, 0.0), LayoutSize::new(100.0, 100.0)),
space_and_clip,
);
builder.push_yuv_image(
&info,
bounds,
YuvData::NV12(yuv_chanel1, yuv_chanel2),
ColorDepth::Color8,
YuvColorSpace::Rec601,
ColorRange::Limited,
ImageRendering::Auto,
);
let info = CommonItemProperties::new(
LayoutRect::from_origin_and_size(LayoutPoint::new(300.0, 0.0), LayoutSize::new(100.0, 100.0)),
space_and_clip,
);
builder.push_yuv_image(
&info,
bounds,
YuvData::PlanarYCbCr(yuv_chanel1, yuv_chanel2_1, yuv_chanel3),
ColorDepth::Color8,
YuvColorSpace::Rec601,
ColorRange::Limited,
ImageRendering::Auto,
);
builder.pop_stacking_context();
}
fn on_event(
&mut self,
_event: winit::event::WindowEvent,
_window: &winit::window::Window,
_api: &mut RenderApi,
_document_id: DocumentId,
) -> bool {
false
}
fn get_image_handler(
&mut self,
gl: &dyn gl::Gl,
) -> Option<Box<dyn ExternalImageHandler>> {
let provider = YuvImageProvider::new(gl);
self.texture_id = provider.texture_ids[0];
Some(Box::new(provider))
}
fn draw_custom(&mut self, gl: &dyn gl::Gl) {
init_gl_texture(self.texture_id, gl::RED, gl::RED, &[self.current_value; 100 * 100], gl);
self.current_value = self.current_value.wrapping_add(1);
}
}
fn main() {
let mut app = App {
texture_id: 0,
current_value: 0,
};
let opts = webrender::WebRenderOptions {
..Default::default()
};
boilerplate::main_wrapper(&mut app, Some(opts));
}