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Update example to use modern rust-gpu (#463)

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* Update example to use modern rust-gpu

* Update README.md
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XAMPPRocky 2021-03-02 10:14:56 +01:00 committed by GitHub
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@ -19,21 +19,26 @@ However, many things aren't implemented yet: for example, loops and switches are
![Sky shader](docs/assets/sky.jpg)
```rust
#[spirv(entry = "fragment")]
pub fn main_fs(input: Input<Vec4>, mut output: Output<Vec4>) {
let dir: Vec3 = input.load().truncate();
use spirv_std::{glam::{Vec3, Vec4, vec2, vec3}, storage_class::{Input, Output}};
#[spirv(fragment)]
pub fn main(
#[spirv(frag_coord)] in_frag_coord: Input<Vec4>,
mut output: Output<Vec4>,
) {
let frag_coord = vec2(in_frag_coord.x, in_frag_coord.y);
let mut uv = (frag_coord - 0.5 * vec2(constants.width as f32, constants.height as f32))
/ constants.height as f32;
uv.y = -uv.y;
let eye_pos = vec3(0.0, 0.0997, 0.2);
let sun_pos = vec3(0.0, 75.0, -1000.0);
let dir = get_ray_dir(uv, eye_pos, sun_pos);
let cs_pos = Vec4(dir.0, -dir.1, 1.0, 1.0);
let ws_pos = {
let p = clip_to_world.mul_vec4(cs_pos);
p.truncate() / p.3
};
let dir = (ws_pos - eye_pos).normalize();
// evaluate Preetham sky model
let color = sky(dir, sun_pos);
output.store(color.extend(0.0))
*output = tonemap(color).extend(1.0)
}
```