63 lines
1.8 KiB
Rust
63 lines
1.8 KiB
Rust
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use std::num::NonZeroU32;
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use winit::raw_window_handle::WindowHandle;
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use winit::raw_window_handle::DisplayHandle;
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use softbuffer::Buffer;
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use super::objs::Object;
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// render context
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pub struct RenderCtx<'buf, 'win> {
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pub(crate) buffer: Buffer<'buf, DisplayHandle<'win>, WindowHandle<'win>>,
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pub(crate) win_size: (u32, u32),
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pub(crate) context_size: (u32, u32),
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pub(crate) context_pos: (u32, u32),
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}
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impl<'buf, 'win> RenderCtx<'buf, 'win> {
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// create new render context
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pub fn new(
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buffer: Buffer<'buf, DisplayHandle<'win>, WindowHandle<'win>>,
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win_size: (NonZeroU32, NonZeroU32),
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context_size: (u32, u32),
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) -> Self {
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Self {
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buffer,
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win_size: (win_size.0.get(), win_size.1.get()),
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context_size,
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context_pos: (
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(win_size.0.get() / 2).saturating_sub(context_size.0 / 2),
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(win_size.1.get() / 2).saturating_sub(context_size.1 / 2),
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),
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}
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}
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pub fn clear(&mut self, color: u32) {
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self.rect(0, 0, self.win_size.0, self.win_size.1, color)
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}
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// draw a rectangle in the context
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//
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// coordinates are relative to the context
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pub fn rect(&mut self, x: u32, y: u32, width: u32, height: u32, color: u32) {
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// position in buffer coordinates and not relative coordinates
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let x_buf_pos = self.context_pos.0 + x;
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let y_buf_pos = self.context_pos.1 + y;
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for y in y_buf_pos..(y_buf_pos + height) {
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for x in x_buf_pos..(x_buf_pos + width) {
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let index = y as usize * self.win_size.0 as usize + x as usize;
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if let Some(px) = self.buffer.get_mut(index) {
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*px = color
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}
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}
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}
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}
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pub fn force_present(self) {
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self.buffer.present().unwrap()
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}
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}
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