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Code Issues Releases Wiki Activity

Implement image scaling

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This commit is contained in:
Bradlee Speice
2025-04-06 20:59:53 -04:00
parent 5806ebd051
commit 98d9111688
2 changed files with 19 additions and 7 deletions
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14
blog/2025-03-30-draw-compute-shader/draw-compute/shader/src/lib.rs
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@ -54,12 +54,16 @@ pub fn main_fs(
#[spirv(storage_buffer, descriptor_set = 0, binding = 1)] image: &mut [glam::Vec4],
output: &mut glam::Vec4,
) {
let pixel_coordinate = frag_coord.xy().as_usizevec2();
let (pixel_x, pixel_y) = (pixel_coordinate.x, pixel_coordinate.y);
let vp_size = viewport.size.as_vec2();
let img_size = viewport.image.as_vec2();
*output = if pixel_x < viewport.image.x as usize && pixel_y < viewport.image.y as usize {
image[image_index(pixel_x, pixel_y, viewport.image.x as usize)]
let scale = (vp_size / img_size).min_element();
let img_offset = (vp_size / scale - img_size) / 2.0;
let img_coord = (frag_coord.xy() - viewport.offset.as_vec2()) / scale - img_offset;
*output = if img_coord.cmpge(glam::Vec2::ZERO).all() && img_coord.cmple(img_size).all() {
image[image_index(img_coord.x as usize, img_coord.y as usize, viewport.image.x as usize)]
} else {
BLACK
};
}
}