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use std::ffi::CStr;
use std::fmt;
use crossfont::Metrics;
use log::info;
use alacritty_terminal::index::Point;
use alacritty_terminal::term::cell::Flags;
use alacritty_terminal::term::color::Rgb;
use alacritty_terminal::term::SizeInfo;
use crate::display::content::RenderableCell;
use crate::gl;
use crate::renderer::rects::{RectRenderer, RenderRect};
use crate::renderer::shader::ShaderError;
pub mod rects;
mod shader;
mod text;
pub use text::{GlyphCache, LoaderApi};
use shader::ShaderVersion;
use text::{Gles2Renderer, Glsl3Renderer, TextRenderer};
macro_rules! cstr {
($s:literal) => {
// This can be optimized into an no-op with pre-allocated NUL-terminated bytes.
unsafe { std::ffi::CStr::from_ptr(concat!($s, "\0").as_ptr().cast()) }
};
}
pub(crate) use cstr;
#[derive(Debug)]
pub enum Error {
/// Shader error.
Shader(ShaderError),
}
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self {
Error::Shader(err) => err.source(),
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Error::Shader(err) => {
write!(f, "There was an error initializing the shaders: {}", err)
},
}
}
}
impl From<ShaderError> for Error {
fn from(val: ShaderError) -> Self {
Error::Shader(val)
}
}
#[derive(Debug)]
enum TextRendererProvider {
Gles2(Gles2Renderer),
Glsl3(Glsl3Renderer),
}
#[derive(Debug)]
pub struct Renderer {
text_renderer: TextRendererProvider,
rect_renderer: RectRenderer,
}
impl Renderer {
/// Create a new renderer.
///
/// This will automatically pick between the GLES2 and GLSL3 renderer based on the GPU's
/// supported OpenGL version.
pub fn new() -> Result<Self, Error> {
let (version, renderer) = unsafe {
let renderer = CStr::from_ptr(gl::GetString(gl::RENDERER) as *mut _);
let version = CStr::from_ptr(gl::GetString(gl::SHADING_LANGUAGE_VERSION) as *mut _);
(version.to_string_lossy(), renderer.to_string_lossy())
};
info!("Running on {}", renderer);
let (text_renderer, rect_renderer) = if version.as_ref() >= "3.3" {
let text_renderer = TextRendererProvider::Glsl3(Glsl3Renderer::new()?);
let rect_renderer = RectRenderer::new(ShaderVersion::Glsl3)?;
(text_renderer, rect_renderer)
} else {
let text_renderer = TextRendererProvider::Gles2(Gles2Renderer::new()?);
let rect_renderer = RectRenderer::new(ShaderVersion::Gles2)?;
(text_renderer, rect_renderer)
};
Ok(Self { text_renderer, rect_renderer })
}
pub fn draw_cells<I: Iterator<Item = RenderableCell>>(
&mut self,
size_info: &SizeInfo,
glyph_cache: &mut GlyphCache,
cells: I,
) {
match &mut self.text_renderer {
TextRendererProvider::Gles2(renderer) => {
renderer.draw_cells(size_info, glyph_cache, cells)
},
TextRendererProvider::Glsl3(renderer) => {
renderer.draw_cells(size_info, glyph_cache, cells)
},
}
}
/// Draw a string in a variable location. Used for printing the render timer, warnings and
/// errors.
pub fn draw_string(
&mut self,
point: Point<usize>,
fg: Rgb,
bg: Rgb,
string: &str,
size_info: &SizeInfo,
glyph_cache: &mut GlyphCache,
) {
let cells = string.chars().enumerate().map(|(i, character)| RenderableCell {
point: Point::new(point.line, point.column + i),
character,
zerowidth: None,
flags: Flags::empty(),
bg_alpha: 1.0,
fg,
bg,
});
self.draw_cells(size_info, glyph_cache, cells);
}
pub fn with_loader<F, T>(&mut self, func: F) -> T
where
F: FnOnce(LoaderApi<'_>) -> T,
{
match &mut self.text_renderer {
TextRendererProvider::Gles2(renderer) => renderer.with_loader(func),
TextRendererProvider::Glsl3(renderer) => renderer.with_loader(func),
}
}
/// Draw all rectangles simultaneously to prevent excessive program swaps.
pub fn draw_rects(&mut self, size_info: &SizeInfo, metrics: &Metrics, rects: Vec<RenderRect>) {
if rects.is_empty() {
return;
}
// Prepare rect rendering state.
unsafe {
// Remove padding from viewport.
gl::Viewport(0, 0, size_info.width() as i32, size_info.height() as i32);
gl::BlendFuncSeparate(gl::SRC_ALPHA, gl::ONE_MINUS_SRC_ALPHA, gl::SRC_ALPHA, gl::ONE);
}
self.rect_renderer.draw(size_info, metrics, rects);
// Activate regular state again.
unsafe {
// Reset blending strategy.
gl::BlendFunc(gl::SRC1_COLOR, gl::ONE_MINUS_SRC1_COLOR);
// Restore viewport with padding.
self.set_viewport(size_info);
}
}
/// Fill the window with `color` and `alpha`.
pub fn clear(&self, color: Rgb, alpha: f32) {
unsafe {
gl::ClearColor(
(f32::from(color.r) / 255.0).min(1.0) * alpha,
(f32::from(color.g) / 255.0).min(1.0) * alpha,
(f32::from(color.b) / 255.0).min(1.0) * alpha,
alpha,
);
gl::Clear(gl::COLOR_BUFFER_BIT);
}
}
#[cfg(not(any(target_os = "macos", windows)))]
pub fn finish(&self) {
unsafe {
gl::Finish();
}
}
/// Set the viewport for cell rendering.
#[inline]
pub fn set_viewport(&self, size: &SizeInfo) {
unsafe {
gl::Viewport(
size.padding_x() as i32,
size.padding_y() as i32,
size.width() as i32 - 2 * size.padding_x() as i32,
size.height() as i32 - 2 * size.padding_y() as i32,
);
}
}
/// Resize the renderer.
pub fn resize(&self, size_info: &SizeInfo) {
self.set_viewport(size_info);
match &self.text_renderer {
TextRendererProvider::Gles2(renderer) => renderer.resize(size_info),
TextRendererProvider::Glsl3(renderer) => renderer.resize(size_info),
}
}
}
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