63 lines
1.8 KiB
Rust
63 lines
1.8 KiB
Rust
use crate::quad::{DEFAULT_MVP, IDENTITY_MVP};
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use librashader_common::Viewport;
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use num_traits::{zero, AsPrimitive, Num};
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use std::borrow::Borrow;
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/// An internal render target to which pass colour attachments are made.
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#[derive(Debug, Clone)]
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pub struct RenderTarget<'a, T, C = f32>
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where
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C: Num,
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{
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/// The x-coordinate of the viewport to render to.
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pub x: C,
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/// The y-coordinate of the viewport to render to.
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pub y: C,
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/// The MVP to pass to the shader for this render pass.
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pub mvp: &'a [f32; 16],
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/// The output surface for the pass.
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pub output: &'a T,
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}
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impl<'a, T, C: Num> RenderTarget<'a, T, C> {
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/// Create a new render target.
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pub fn new(output: &'a T, mvp: &'a [f32; 16], x: C, y: C) -> Self {
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RenderTarget { output, mvp, x, y }
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}
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/// Create a render target with the identity MVP.
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pub fn identity(output: &'a T) -> Self {
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Self::offscreen(output, IDENTITY_MVP)
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}
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/// Create an offscreen render target with the given MVP.
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pub fn offscreen(output: &'a T, mvp: &'a [f32; 16]) -> Self {
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Self::new(output, mvp, zero(), zero())
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}
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}
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impl<'a, T, C: Num + Copy + 'static> RenderTarget<'a, T, C>
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where
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f32: AsPrimitive<C>,
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{
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/// Create a viewport render target.
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pub fn viewport(viewport: &'a Viewport<'a, impl Borrow<T>>) -> Self {
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Self::new(
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viewport.output.borrow(),
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viewport.mvp.unwrap_or(DEFAULT_MVP),
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viewport.x.as_(),
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viewport.y.as_(),
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)
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}
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/// Create a viewport render target with the given output.
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pub fn viewport_with_output<S>(output: &'a T, viewport: &'a Viewport<'a, S>) -> Self {
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Self::new(
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output,
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viewport.mvp.unwrap_or(DEFAULT_MVP),
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viewport.x.as_(),
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viewport.y.as_(),
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)
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}
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}
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