58 lines
1.4 KiB
Rust
58 lines
1.4 KiB
Rust
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use std::ops::Mul;
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use librashader_common::Size;
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use librashader_presets::{Scale2D, ScaleFactor, ScaleType, Scaling};
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use num_traits::AsPrimitive;
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pub fn scale<T>(scaling: Scale2D, source: Size<T>, viewport: Size<T>) -> Size<T>
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where T: Mul<ScaleFactor, Output=f32> + Copy + 'static,
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f32: AsPrimitive<T>,
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{
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let width: f32;
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let height: f32;
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match scaling.x {
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Scaling {
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scale_type: ScaleType::Input,
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factor,
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} => width = source.width * factor,
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Scaling {
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scale_type: ScaleType::Absolute,
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factor,
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} => width = factor.into(),
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Scaling {
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scale_type: ScaleType::Viewport,
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factor,
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} => width = viewport.width * factor,
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};
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match scaling.y {
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Scaling {
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scale_type: ScaleType::Input,
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factor,
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} => height = source.height * factor,
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Scaling {
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scale_type: ScaleType::Absolute,
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factor,
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} => height = factor.into(),
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Scaling {
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scale_type: ScaleType::Viewport,
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factor,
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} => height = viewport.height * factor,
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};
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Size {
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width: width.round().as_(),
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height: height.round().as_(),
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}
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}
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pub fn calc_miplevel(size: Size<u32>) -> u32 {
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let mut size = std::cmp::max(size.width, size.height);
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let mut levels = 0;
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while size != 0 {
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levels += 1;
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size >>= 1;
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}
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levels
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}
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