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use crate::{resources::TetraResources, Error};
use raui_core::{
layout::{CoordsMapping, Layout},
renderer::Renderer,
widget::{unit::WidgetUnit, utils::Vec2 as RauiVec2},
Scalar,
};
use raui_tesselate_renderer::{
renderer::TesselateRenderer,
tesselation::{Batch, TesselationVerticesFormat},
};
use tetra::{
graphics::{
get_transform_matrix,
mesh::{Mesh, VertexWinding},
set_transform_matrix,
text::Text,
Color, DrawParams,
},
math::{Mat4, Vec2},
Context,
};
pub struct TetraRenderer<'a> {
context: &'a mut Context,
resources: &'a mut TetraResources,
}
impl<'a> TetraRenderer<'a> {
pub fn new(context: &'a mut Context, resources: &'a mut TetraResources) -> Self {
Self { context, resources }
}
}
impl<'a> Renderer<(), Error> for TetraRenderer<'a> {
fn render(
&mut self,
tree: &WidgetUnit,
mapping: &CoordsMapping,
layout: &Layout,
) -> Result<(), Error> {
for (k, t) in &self.resources.textures {
if let Some(v) = self.resources.image_sizes.get_mut(k) {
v.x = t.width() as Scalar;
v.y = t.height() as Scalar;
} else {
self.resources.image_sizes.insert(
k.to_owned(),
RauiVec2 {
x: t.width() as Scalar,
y: t.height() as Scalar,
},
);
}
}
let to_remove = self
.resources
.image_sizes
.keys()
.filter(|k| !self.resources.textures.contains_key(k.as_str()))
.cloned()
.collect::<Vec<_>>();
for key in to_remove {
self.resources.image_sizes.remove(key.as_str());
}
let tesselation = TesselateRenderer::with_capacity(
TesselationVerticesFormat::Interleaved,
(),
&self.resources.atlas_mapping,
&self.resources.image_sizes,
64,
)
.render(tree, mapping, layout)?
.optimized_batches();
let mesh_data = self.resources.access_mesh_data(self.context)?;
mesh_data.write(self.context, &tesselation)?;
let (vertices, indices) = mesh_data.read();
let mut mesh = Mesh::indexed(vertices, indices);
mesh.set_front_face_winding(VertexWinding::Clockwise);
for batch in tesselation.batches {
match batch {
Batch::ColoredTriangles(range) => {
mesh.reset_texture();
mesh.set_draw_range(range.start, range.end - range.start);
mesh.draw(self.context, DrawParams::new());
}
Batch::ImageTriangles(id, range) => {
if let Some(texture) = self.resources.textures.get(&id).cloned() {
mesh.set_texture(texture);
mesh.set_draw_range(range.start, range.end - range.start);
mesh.draw(self.context, DrawParams::new());
} else {
return Err(Error::ImageResourceNotFound(id));
}
}
Batch::ExternalText(wid, text) => {
let id = format!("{}:{}", text.font, text.size as usize);
if let Some((font_scale, font)) = self.resources.fonts.get(&id).cloned() {
let old_matrix = get_transform_matrix(self.context);
let new_matrix = Mat4::from_col_array(text.matrix);
set_transform_matrix(self.context, new_matrix);
let scale = mapping.scale();
let box_size = (text.box_size.0 * font_scale, text.box_size.1 * font_scale);
let mut renderable = match self.resources.texts.remove(&wid) {
Some(mut renderable) => {
renderable.set_content(text.text.as_str());
renderable.set_font(font);
renderable.set_max_width(Some(box_size.0));
renderable
}
None => Text::wrapped(text.text.as_str(), font, box_size.0),
};
let height = renderable
.get_bounds(self.context)
.map(|rect| rect.height)
.unwrap_or(box_size.1);
let scale = if height > 0.0 {
let f = (box_size.1 / height).min(1.0);
Vec2::new(scale / font_scale, scale * f / font_scale)
} else {
Vec2::default()
};
let params = DrawParams::new().scale(scale).color(Color::rgba(
text.color.0,
text.color.1,
text.color.2,
text.color.3,
));
renderable.draw(self.context, params);
self.resources.texts.insert(wid, renderable);
set_transform_matrix(self.context, old_matrix);
} else {
return Err(Error::FontResourceNotFound(id));
}
}
_ => {}
}
}
Ok(())
}
}