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use crate::prelude::*;
use crate::core::{
context,
Display, Layer, Texture, TextureFilter, Color, Program, Postprocessor,
Context, AsRenderTarget, RenderTarget, RenderTargetInner,
blendmodes, TextureFormat
};
use crate::core::math::*;
use crate::core::builder::*;
use crate::backends::backend;
static VIEWPORT_ONE: std::sync::LazyLock<Mat4> = std::sync::LazyLock::new(|| Mat4::viewport(1.0, 1.0));
/// A renderer is used to render [`Layers`](struct.Layer.html) or [`Textures`](struct.Texture.html) to the
/// [`Display`](struct.Display.html).
///
/// The renderer itself is not thread-safe. Instead, draw or write onto layers (from any one or
/// more threads) and present those layers using the renderer once your threads have concluded
/// drawing.
#[derive(Clone)]
pub struct Renderer {
pub(crate) context : Context,
pub(crate) program : Rc<Program>,
pub(crate) target : Rc<RefCell<Vec<RenderTarget>>>,
}
impl Debug for Renderer {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Renderer")
}
}
impl Renderer {
/// Returns a new renderer instance that renders to given display by default.
pub fn new(display: &Display) -> crate::core::Result<Self> {
let target = vec![ RenderTarget(RenderTargetInner::Frame(display.frame.clone())) ];
Self::create(display.context(), target)
}
/// Returns a new renderer instance.
pub fn headless(context: &Context) -> crate::core::Result<Self> {
Self::create(context, Vec::new())
}
/// Returns a new renderer instance.
fn create(context: &Context, target: Vec<RenderTarget>) -> crate::core::Result<Self> {
let default_program = Program::new_default(context)?;
let identity_texture = Texture::builder(context).format(TextureFormat::F16F16F16F16).dimensions((1, 1)).build().unwrap();
identity_texture.clear(Color::WHITE);
Ok(Renderer {
context : context.clone(),
program : Rc::new(default_program),
target : Rc::new(RefCell::new(target)),
})
}
/// Returns a reference to the renderers' context. The [`Context`](struct.Context.html)
/// implements send+sync and is required by [`Font`](struct.Font.html), [`Sprite`](struct.Sprite.html)
/// and [`Texture`](struct.Texture.html) to create new instances.
#[deprecated(since="0.14.0", note="Use `Display::context()` instead")]
pub fn context(self: &Self) -> Context {
self.context.clone()
}
/// Clears the current target.
pub fn clear(self: &Self, color: Color) -> &Self {
self.target.borrow().last().unwrap().0.clear(color);
self
}
/// Draws given layer to the current target. Component refers to the sprite component to draw.
/// All sprites support at least component 0. Sprites that do not support
/// the given component will not be drawn.
pub fn draw_layer(self: &Self, layer: &Layer, component: u32) -> &Self {
// open context
let mut context = self.context.lock();
let context = context.deref_mut();
// update sprite texture arrays, font texture and vertex buffer as required
context.update_tex_array();
context.update_font_cache();
// use default or custom program
let program = layer.program().unwrap_or(&self.program);
backend::draw_layer(self.target.borrow().last().unwrap(), program, context, layer, component);
self
}
/// Draws a rectangle to the current target. See [`DrawBuilder`](support/struct.DrawBuilder.html) for available options.
///
/// # Examples
///
/// ```rust
/// # use radiant_rs::*;
/// # let display = Display::builder().hidden().build().unwrap();
/// # let renderer = Renderer::new(&display).unwrap();
/// # let tex = Texture::new(&display.context(), 1, 1);
/// # display.prepare_frame();
/// renderer.rect(((0., 0.), (640., 480.))).blendmode(blendmodes::ALPHA).texture(&tex).draw();
/// # display.swap_frame();
/// ```
pub fn rect<T>(self: &Self, target_rect: T) -> DrawBuilder<'_, DrawBuilderRect> where Rect<f32>: From<T> {
DrawBuilderRect::new(self, Rect::<f32>::from(target_rect))
}
/// Fills the current target. See [`DrawBuilder`](support/struct.DrawBuilder.html) for available options.
///
/// This is a specialization of `rect()` that simply fills the entire target.
///
/// # Examples
///
/// ```rust
/// # use radiant_rs::*;
/// # let display = Display::builder().hidden().build().unwrap();
/// # let renderer = Renderer::new(&display).unwrap();
/// # let tex = Texture::new(&display.context(), 1, 1);
/// # display.prepare_frame();
/// renderer.fill().blendmode(blendmodes::ALPHA).texture(&tex).draw();
/// # display.swap_frame();
/// ```
pub fn fill(self: &Self) -> DrawBuilder<'_, DrawBuilderFill> {
DrawBuilderFill::new(self)
}
/// Reroutes draws issued within `draw_func()` to given Texture.
///
/// # Examples
///
/// ```rust
/// # use radiant_rs::*;
/// # let display = Display::builder().hidden().build().unwrap();
/// # let renderer = Renderer::new(&display).unwrap();
/// # let some_layer = Layer::new((1.0, 1.0));
/// # let some_texture = Texture::new(&display.context(), 1, 1);
/// # let context = display.context();
/// // Create a texture to render to.
/// let surface = Texture::new(&context, 640, 480);
///
/// // Render something to it.
/// # display.prepare_frame();
/// renderer.render_to(&surface, || {
/// renderer.rect(((0., 0.), (640., 480.))).texture(&some_texture).draw();
/// renderer.draw_layer(&some_layer, 0);
/// });
/// # display.swap_frame();
/// ```
pub fn render_to<F, T>(self: &Self, target: &T, mut draw_func: F) -> &Self where F: FnMut(), T: AsRenderTarget {
self.push_target(target);
draw_func();
self.pop_target();
self
}
/// Reroutes draws issued within `draw_func()` through the given postprocessor.
///
/// The following example uses the [`Basic`](postprocessors/struct.Basic.html) postprocessor provided by the library.
///
/// # Examples
///
/// ```rust
/// # use radiant_rs::*;
/// # let display = Display::builder().hidden().build().unwrap();
/// # let renderer = Renderer::new(&display).unwrap();
/// # let some_layer = Layer::new((1.0, 1.0));
/// # let some_texture = Texture::new(&display.context(), 1, 1);
/// # let context = display.context();
/// # let program_source = "#version 140\nout vec4 f_color;\nvoid main() { f_color = vec4(0.0, 0.0, 0.0, 0.0); }";
/// # let my_layer = Layer::new((1.0, 1.0));
/// // Load a shader progam.
/// let my_program = Program::from_string(&context, &program_source).unwrap();
///
/// // Create the postprocessor with the program.
/// let my_postprocessor = postprocessors::Basic::new(&context, my_program, display.dimensions());
///
/// // ... in your renderloop...
/// # display.prepare_frame();
/// renderer.postprocess(&my_postprocessor, &blendmodes::ALPHA, || {
/// renderer.clear(Color::BLACK);
/// renderer.draw_layer(&my_layer, 0);
/// });
/// # display.swap_frame();
/// ```
pub fn postprocess<P, F>(self: &Self, postprocessor: &P, arg: &<P as Postprocessor>::T, mut draw_func: F) -> &Self where F: FnMut(), P: Postprocessor {
// draw to temporary target using given draw_func
self.push_target(postprocessor.target());
draw_func();
// postprocess draw result
postprocessor.process(self, arg);
// restore previous target and draw postprocessor result
self.pop_target();
postprocessor.draw(self, arg);
self
}
/// Copies a rectangle from the source to the current target.
///
/// This is a blitting operation that uses integral pixel coordinates (top/left = 0/0).
/// Coordinates must be entirely contained within their respective sources. No blending is performed.
pub fn copy_rect_from<R, S, T>(self: &Self, source: &R, source_rect: S, target_rect: T, filter: TextureFilter) where R: AsRenderTarget, Rect<i32>: From<S> + From<T> {
self.target.borrow().last().unwrap().0.blit_rect(&source.as_render_target(), source_rect.into(), target_rect.into(), filter);
}
/// Copies the entire source, overwriting the entire current target.
///
/// This is a blitting operation, no blending is performed.
pub fn copy_from<R>(self: &Self, source: &R, filter: TextureFilter) where R: AsRenderTarget {
self.target.borrow().last().unwrap().0.blit(&source.as_render_target(), filter);
}
/// Returns a reference to the default rendering program.
pub fn default_program(self: &Self) -> &Program {
self.program.deref()
}
/// Draws the rectangle described info to the current target.
pub(crate) fn draw_rect<T>(self: &Self, target: DrawBuilder<T>) -> &Self {
// open context
let mut context = self.context.lock();
let context = context.deref_mut();
// use default or custom program and texture
let program = target.program.unwrap_or(&self.program);
let texture = target.texture;
let color = target.color.unwrap_or(Color::WHITE);
let blendmode = target.blendmode.unwrap_or(blendmodes::ALPHA);
let model_matrix = target.model_matrix.unwrap_or(Mat4::identity());
let view_matrix = match target.view_matrix {
DrawBuilderViewSource::Matrix(matrix) => matrix,
DrawBuilderViewSource::One => *VIEWPORT_ONE,
DrawBuilderViewSource::Target => {
let dim = self.target.borrow().last().unwrap().0.dimensions();
Mat4::viewport(dim.0 as f32, dim.1 as f32)
}
DrawBuilderViewSource::Display(display) => {
let dim = display.dimensions();
Mat4::viewport(dim.0 as f32, dim.1 as f32)
}
DrawBuilderViewSource::Source => {
let dim = texture.expect("Cannot derive view-matrix from 'source' without a source").dimensions();
Mat4::viewport(dim.0 as f32, dim.1 as f32)
}
};
backend::draw_rect(self.target.borrow().last().unwrap(), program, context, blendmode, target, view_matrix, model_matrix, color, texture);
self
}
/// Returns the appropriate bucket_id and padded texture size for the given texture size
pub(crate) fn bucket_info(width: u32, height: u32) -> (u32, u32) {
let ln2 = (cmp::max(width, height) as f32).log2().ceil() as u32;
// skip first five sizes 1x1 to 16x16, use id 0 for font-cache
let bucket_id = cmp::max(1, ln2 as i32 - 4 + 1) as u32;
let size = 2u32.pow(bucket_id + 4 - 1);
assert!(bucket_id < context::NUM_BUCKETS as u32, "texture size exceeded configured maximum");
(bucket_id, size)
}
/// Pushes a target onto the target stack
fn push_target<T>(self: &Self, target: &T) where T: AsRenderTarget {
self.target.borrow_mut().push(target.as_render_target().clone());
}
/// Pops a target from the target stack
fn pop_target(self: &Self) {
self.target.borrow_mut().pop();
}
}