mirror of
https://github.com/bspeice/speice.io
synced 2025-07-01 05:46:13 -04:00
Compare commits
8 Commits
flame-came
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draw-compu
| Author | SHA1 | Date | |
|---|---|---|---|
| 96ad697ba8 | |||
| 9d7a042e7a | |||
| a976ddaf30 | |||
| 8aeb3cc32a | |||
| 98d9111688 | |||
| 5806ebd051 | |||
| 651ba4a078 | |||
| 58ff3f4bde |
BIN
blog/2025-03-30-draw-compute-shader/bounding box.png
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blog/2025-03-30-draw-compute-shader/bounding box.png
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2
blog/2025-03-30-draw-compute-shader/draw-compute/.gitignore
vendored
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2
blog/2025-03-30-draw-compute-shader/draw-compute/.gitignore
vendored
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@ -0,0 +1,2 @@
|
||||
/.idea
|
||||
target/
|
||||
4048
blog/2025-03-30-draw-compute-shader/draw-compute/Cargo.lock
generated
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4048
blog/2025-03-30-draw-compute-shader/draw-compute/Cargo.lock
generated
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14
blog/2025-03-30-draw-compute-shader/draw-compute/Cargo.toml
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14
blog/2025-03-30-draw-compute-shader/draw-compute/Cargo.toml
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@ -0,0 +1,14 @@
|
||||
[package]
|
||||
name = "draw-compute"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[dependencies]
|
||||
bytemuck = { version = "1.22", features = ["derive"] }
|
||||
eframe = { version = "0.31", features = ["wgpu"] }
|
||||
egui = "0.31"
|
||||
egui-wgpu = "0.31"
|
||||
glam = { version = "0.30", default-features = false, features = ["bytemuck", "libm"] }
|
||||
wgpu = { version = "24.0", features = ["spirv"] }
|
||||
|
||||
shader = { path = "shader" }
|
||||
26
blog/2025-03-30-draw-compute-shader/draw-compute/build.rs
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26
blog/2025-03-30-draw-compute-shader/draw-compute/build.rs
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@ -0,0 +1,26 @@
|
||||
use std::error::Error;
|
||||
use std::path::PathBuf;
|
||||
use std::{env, process};
|
||||
|
||||
pub fn main() -> Result<(), Box<dyn Error>> {
|
||||
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("shader.spv");
|
||||
let mut cargo = process::Command::new("cargo");
|
||||
|
||||
let mut shader_cli = cargo
|
||||
.current_dir("./shader-cli")
|
||||
.arg("run")
|
||||
.arg("--")
|
||||
.arg("../shader")
|
||||
.arg(out_path);
|
||||
|
||||
// Clean all `RUST*`/`CARGO*` environment variables so `rust-toolchain.toml` takes over
|
||||
for env_var in env::vars() {
|
||||
if env_var.0.starts_with("RUST") || env_var.0.starts_with("CARGO") {
|
||||
shader_cli = shader_cli.env_remove(env_var.0);
|
||||
}
|
||||
}
|
||||
|
||||
shader_cli.status()?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
968
blog/2025-03-30-draw-compute-shader/draw-compute/shader-cli/Cargo.lock
generated
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968
blog/2025-03-30-draw-compute-shader/draw-compute/shader-cli/Cargo.lock
generated
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@ -0,0 +1,968 @@
|
||||
# This file is automatically @generated by Cargo.
|
||||
# It is not intended for manual editing.
|
||||
version = 4
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checksum = "704b1aeb7be0d0a84fc9828cae51dab5970fee5088f83d1dd7ee6f6246fc6ff1"
|
||||
dependencies = [
|
||||
"serde",
|
||||
"tracing-core",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tracing-subscriber"
|
||||
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|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
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|
||||
dependencies = [
|
||||
"matchers",
|
||||
"nu-ansi-term 0.46.0",
|
||||
"once_cell",
|
||||
"regex",
|
||||
"serde",
|
||||
"serde_json",
|
||||
"sharded-slab",
|
||||
"smallvec",
|
||||
"thread_local",
|
||||
"tracing",
|
||||
"tracing-core",
|
||||
"tracing-log",
|
||||
"tracing-serde",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "tracing-tree"
|
||||
version = "0.3.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "b56c62d2c80033cb36fae448730a2f2ef99410fe3ecbffc916681a32f6807dbe"
|
||||
dependencies = [
|
||||
"nu-ansi-term 0.50.1",
|
||||
"tracing-core",
|
||||
"tracing-log",
|
||||
"tracing-subscriber",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "twox-hash"
|
||||
version = "1.6.3"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "97fee6b57c6a41524a810daee9286c02d7752c4253064d0b05472833a438f675"
|
||||
dependencies = [
|
||||
"cfg-if",
|
||||
"static_assertions",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "unicode-ident"
|
||||
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|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
|
||||
|
||||
[[package]]
|
||||
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|
||||
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|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ba73ea9cf16a25df0c8caa16c51acb937d5712a8429db78a3ee29d5dcacd3a65"
|
||||
|
||||
[[package]]
|
||||
name = "version_check"
|
||||
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|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
|
||||
|
||||
[[package]]
|
||||
name = "wasi"
|
||||
version = "0.11.0+wasi-snapshot-preview1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
|
||||
|
||||
[[package]]
|
||||
name = "wasmparser"
|
||||
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|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "fa210fd1788e6b37a1d1930f3389c48e1d6ebd1a013d34fa4b7f9e3e3bf03146"
|
||||
dependencies = [
|
||||
"bitflags",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.3.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||
dependencies = [
|
||||
"winapi-i686-pc-windows-gnu",
|
||||
"winapi-x86_64-pc-windows-gnu",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-i686-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-x86_64-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||
|
||||
[[package]]
|
||||
name = "windows-sys"
|
||||
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|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
|
||||
dependencies = [
|
||||
"windows-targets",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-sys"
|
||||
version = "0.59.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
|
||||
dependencies = [
|
||||
"windows-targets",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-targets"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
|
||||
dependencies = [
|
||||
"windows_aarch64_gnullvm",
|
||||
"windows_aarch64_msvc",
|
||||
"windows_i686_gnu",
|
||||
"windows_i686_gnullvm",
|
||||
"windows_i686_msvc",
|
||||
"windows_x86_64_gnu",
|
||||
"windows_x86_64_gnullvm",
|
||||
"windows_x86_64_msvc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
|
||||
|
||||
[[package]]
|
||||
name = "zerocopy"
|
||||
version = "0.7.35"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
|
||||
dependencies = [
|
||||
"zerocopy-derive",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "zerocopy-derive"
|
||||
version = "0.7.35"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
]
|
||||
@ -0,0 +1,13 @@
|
||||
[package]
|
||||
name = "shader-cli"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[dependencies]
|
||||
spirv-builder = { git = "https://github.com/rust-gpu/rust-gpu", rev = "698f10ac14b7c952394ac5620004e4e973308902" }
|
||||
|
||||
# On Windows, link.exe has a maximum of 65536 symbols.
|
||||
# These options are required to stay within that limit
|
||||
[profile.dev]
|
||||
opt-level = 3
|
||||
codegen-units = 256
|
||||
@ -0,0 +1,4 @@
|
||||
[toolchain]
|
||||
channel = "nightly-2024-11-22"
|
||||
components = ["rust-src", "rustc-dev", "llvm-tools"]
|
||||
# commit_hash = b19329a37cedf2027517ae22c87cf201f93d776e
|
||||
@ -0,0 +1,12 @@
|
||||
use std::env::args;
|
||||
use spirv_builder::SpirvBuilder;
|
||||
|
||||
fn main() {
|
||||
let crate_path = args().nth(1).expect("Missing crate path");
|
||||
let output_path = args().nth(2).expect("Missing output path");
|
||||
|
||||
let builder = SpirvBuilder::new(crate_path, "spirv-unknown-vulkan1.1");
|
||||
let build_result = builder.build().expect("Could not compile shader");
|
||||
let compile_path = build_result.module.unwrap_single();
|
||||
std::fs::copy(compile_path, output_path).expect("Unable to copy shader to destination");
|
||||
}
|
||||
156
blog/2025-03-30-draw-compute-shader/draw-compute/shader/Cargo.lock
generated
Normal file
156
blog/2025-03-30-draw-compute-shader/draw-compute/shader/Cargo.lock
generated
Normal file
@ -0,0 +1,156 @@
|
||||
# This file is automatically @generated by Cargo.
|
||||
# It is not intended for manual editing.
|
||||
version = 3
|
||||
|
||||
[[package]]
|
||||
name = "autocfg"
|
||||
version = "1.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
|
||||
|
||||
[[package]]
|
||||
name = "bitflags"
|
||||
version = "1.3.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
|
||||
|
||||
[[package]]
|
||||
name = "bytemuck"
|
||||
version = "1.22.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "b6b1fc10dbac614ebc03540c9dbd60e83887fda27794998c6528f1782047d540"
|
||||
dependencies = [
|
||||
"bytemuck_derive",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "bytemuck_derive"
|
||||
version = "1.9.3"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "7ecc273b49b3205b83d648f0690daa588925572cc5063745bfe547fe7ec8e1a1"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn 2.0.100",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "glam"
|
||||
version = "0.24.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "b5418c17512bdf42730f9032c74e1ae39afc408745ebb2acf72fbc4691c17945"
|
||||
dependencies = [
|
||||
"libm",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "glam"
|
||||
version = "0.30.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "bf3aa70d918d2b234126ff4f850f628f172542bf0603ded26b8ee36e5e22d5f9"
|
||||
dependencies = [
|
||||
"bytemuck",
|
||||
"libm",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "libm"
|
||||
version = "0.2.11"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8355be11b20d696c8f18f6cc018c4e372165b1fa8126cef092399c9951984ffa"
|
||||
|
||||
[[package]]
|
||||
name = "num-traits"
|
||||
version = "0.2.19"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
|
||||
dependencies = [
|
||||
"autocfg",
|
||||
"libm",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "proc-macro2"
|
||||
version = "1.0.94"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a31971752e70b8b2686d7e46ec17fb38dad4051d94024c88df49b667caea9c84"
|
||||
dependencies = [
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "quote"
|
||||
version = "1.0.40"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "1885c039570dc00dcb4ff087a89e185fd56bae234ddc7f056a945bf36467248d"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "shader"
|
||||
version = "0.1.0"
|
||||
dependencies = [
|
||||
"bytemuck",
|
||||
"glam 0.30.1",
|
||||
"spirv-std",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "spirv-std"
|
||||
version = "0.9.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "68c3c0972a2df79abe2c8af2fe7f7937a9aa558b6a1f78fc5edf93f4d480d757"
|
||||
dependencies = [
|
||||
"bitflags",
|
||||
"glam 0.24.2",
|
||||
"num-traits",
|
||||
"spirv-std-macros",
|
||||
"spirv-std-types",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "spirv-std-macros"
|
||||
version = "0.9.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "73f776bf9f2897ea7acff15d7753711fdf1693592bd7459a01c394262b1df45c"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"spirv-std-types",
|
||||
"syn 1.0.109",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "spirv-std-types"
|
||||
version = "0.9.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a73417b7d72d95b4995c840dceb4e3b4bcbad4ff7f35df9c1655b6826c18d3a9"
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "1.0.109"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "2.0.100"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "b09a44accad81e1ba1cd74a32461ba89dee89095ba17b32f5d03683b1b1fc2a0"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "unicode-ident"
|
||||
version = "1.0.18"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
|
||||
@ -0,0 +1,12 @@
|
||||
[package]
|
||||
name = "shader"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[lib]
|
||||
crate-type = ["rlib", "cdylib"]
|
||||
|
||||
[dependencies]
|
||||
bytemuck = { version = "1.22", features = ["derive"] }
|
||||
glam = { version = "0.30", default-features = false, features = ["bytemuck", "libm"] }
|
||||
spirv-std = "0.9.0"
|
||||
@ -0,0 +1,133 @@
|
||||
#![no_std]
|
||||
use glam::Vec4Swizzles;
|
||||
use spirv_std::spirv;
|
||||
|
||||
pub trait DrawSettings: Copy + Sized + bytemuck::Pod + bytemuck::Zeroable {}
|
||||
|
||||
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
|
||||
#[repr(C)]
|
||||
pub struct DrawSized {
|
||||
pub image_size: glam::UVec2,
|
||||
pub viewport_size: glam::UVec2,
|
||||
}
|
||||
impl DrawSettings for DrawSized {}
|
||||
|
||||
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
|
||||
#[repr(C)]
|
||||
pub struct DrawRect {
|
||||
pub image_size: glam::UVec2,
|
||||
pub viewport_size: glam::UVec2,
|
||||
pub viewport_offset: glam::UVec2,
|
||||
}
|
||||
impl DrawSettings for DrawRect {}
|
||||
|
||||
const BLOCK_SIZE: usize = 16;
|
||||
const BLACK: glam::Vec4 = glam::vec4(0.0, 0.0, 0.0, 1.0);
|
||||
const WHITE: glam::Vec4 = glam::vec4(1.0, 1.0, 1.0, 1.0);
|
||||
|
||||
fn image_index(x: usize, y: usize, width: usize) -> usize {
|
||||
y * width + x
|
||||
}
|
||||
|
||||
fn in_bounds(image_coordinate: glam::Vec2, image_size: glam::Vec2) -> bool {
|
||||
image_coordinate.cmpge(glam::Vec2::ZERO).all() && image_coordinate.cmplt(image_size).all()
|
||||
}
|
||||
|
||||
#[spirv(compute(threads(1)))]
|
||||
pub fn main_cs_bounding(
|
||||
#[spirv(uniform, descriptor_set = 0, binding = 0)] viewport: &DrawSized,
|
||||
#[spirv(storage_buffer, descriptor_set = 0, binding = 1)] image: &mut [glam::Vec4],
|
||||
) {
|
||||
let width = viewport.image_size.x as usize;
|
||||
let height = viewport.image_size.y as usize;
|
||||
|
||||
for x in 0..width {
|
||||
for y in 0..height {
|
||||
image[image_index(x, y, width)] =
|
||||
if x == 0 || x == width - 1 || y == 0 || y == height - 1 {
|
||||
WHITE
|
||||
} else {
|
||||
BLACK
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[spirv(compute(threads(1)))]
|
||||
pub fn main_cs_blocks(
|
||||
#[spirv(uniform, descriptor_set = 0, binding = 0)] viewport: &DrawSized,
|
||||
#[spirv(storage_buffer, descriptor_set = 0, binding = 1)] image: &mut [glam::Vec4],
|
||||
) {
|
||||
let width = viewport.image_size.x as usize;
|
||||
let height = viewport.image_size.y as usize;
|
||||
for x in 0..width {
|
||||
let x_even = x / BLOCK_SIZE % 2 == 0;
|
||||
for y in 0..height {
|
||||
let y_even = y / BLOCK_SIZE % 2 == 0;
|
||||
|
||||
let color = if x_even == y_even { BLACK } else { WHITE };
|
||||
let index = image_index(x, y, width);
|
||||
image[index] = color;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[spirv(vertex)]
|
||||
pub fn main_vs(
|
||||
#[spirv(vertex_index)] vert_id: u32,
|
||||
#[spirv(position, invariant)] position: &mut glam::Vec4,
|
||||
) {
|
||||
let output_uv = glam::vec2(((vert_id << 1) & 2) as f32, (vert_id & 2) as f32);
|
||||
*position = (output_uv * 2.0 - 1.0, 0.0, 1.0).into();
|
||||
}
|
||||
|
||||
#[spirv(fragment)]
|
||||
pub fn main_fs_size(
|
||||
#[spirv(frag_coord)] frag_coord: glam::Vec4,
|
||||
#[spirv(uniform, descriptor_set = 0, binding = 0)] draw_settings: &DrawSized,
|
||||
#[spirv(storage_buffer, descriptor_set = 0, binding = 1)] image: &mut [glam::Vec4],
|
||||
output: &mut glam::Vec4,
|
||||
) {
|
||||
let vp_size = draw_settings.viewport_size.as_vec2();
|
||||
let img_size = draw_settings.image_size.as_vec2();
|
||||
|
||||
let scale = (vp_size / img_size).min_element();
|
||||
let img_offset = (vp_size / scale - img_size) / 2.0;
|
||||
let img_coord = frag_coord.xy() / scale - img_offset;
|
||||
|
||||
*output = if in_bounds(img_coord, img_size) {
|
||||
image[image_index(
|
||||
img_coord.x as usize,
|
||||
img_coord.y as usize,
|
||||
img_size.x as usize,
|
||||
)]
|
||||
} else {
|
||||
BLACK
|
||||
}
|
||||
}
|
||||
|
||||
#[spirv(fragment)]
|
||||
pub fn main_fs_rect(
|
||||
#[spirv(frag_coord)] frag_coord: glam::Vec4,
|
||||
#[spirv(uniform, descriptor_set = 0, binding = 0)] draw_settings: &DrawRect,
|
||||
#[spirv(storage_buffer, descriptor_set = 0, binding = 1)] image: &mut [glam::Vec4],
|
||||
output: &mut glam::Vec4,
|
||||
) {
|
||||
let vp_size = draw_settings.viewport_size.as_vec2();
|
||||
let img_size = draw_settings.image_size.as_vec2();
|
||||
|
||||
let scale = (vp_size / img_size).min_element();
|
||||
let img_offset = (vp_size / scale - img_size) / 2.0;
|
||||
let img_coord =
|
||||
(frag_coord.xy() - draw_settings.viewport_offset.as_vec2()) / scale - img_offset;
|
||||
|
||||
*output = if in_bounds(img_coord, img_size) {
|
||||
image[image_index(
|
||||
img_coord.x as usize,
|
||||
img_coord.y as usize,
|
||||
img_size.x as usize,
|
||||
)]
|
||||
} else {
|
||||
BLACK
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,16 @@
|
||||
use draw_compute::draw_shaders::ShaderBounding;
|
||||
use draw_compute::ComputeDraw;
|
||||
|
||||
fn main() {
|
||||
let native_options = eframe::NativeOptions {
|
||||
renderer: eframe::Renderer::Wgpu,
|
||||
..Default::default()
|
||||
};
|
||||
|
||||
eframe::run_native(
|
||||
"Compute Draw",
|
||||
native_options,
|
||||
Box::new(|_cc| Ok(Box::new(ComputeDraw::<ShaderBounding>::new()))),
|
||||
)
|
||||
.unwrap()
|
||||
}
|
||||
@ -0,0 +1,15 @@
|
||||
use draw_compute::draw_shaders::ShaderOffset;
|
||||
use draw_compute::ComputeDraw;
|
||||
|
||||
fn main() {
|
||||
let native_options = eframe::NativeOptions {
|
||||
renderer: eframe::Renderer::Wgpu,
|
||||
..Default::default()
|
||||
};
|
||||
|
||||
eframe::run_native(
|
||||
"Compute Draw",
|
||||
native_options,
|
||||
Box::new(|_cc| Ok(Box::new(ComputeDraw::<ShaderOffset>::new()))),
|
||||
).unwrap()
|
||||
}
|
||||
@ -0,0 +1,15 @@
|
||||
use draw_compute::draw_shaders::ShaderOffsetBlocks;
|
||||
use draw_compute::ComputeDraw;
|
||||
|
||||
fn main() {
|
||||
let native_options = eframe::NativeOptions {
|
||||
renderer: eframe::Renderer::Wgpu,
|
||||
..Default::default()
|
||||
};
|
||||
|
||||
eframe::run_native(
|
||||
"Compute Draw",
|
||||
native_options,
|
||||
Box::new(|_cc| Ok(Box::new(ComputeDraw::<ShaderOffsetBlocks>::new()))),
|
||||
).unwrap()
|
||||
}
|
||||
@ -0,0 +1,196 @@
|
||||
use shader::DrawSettings;
|
||||
use std::marker::PhantomData;
|
||||
|
||||
pub trait ShaderSettings: Send + Sync {
|
||||
type DrawSettings: DrawSettings;
|
||||
|
||||
fn compute_shader() -> &'static str;
|
||||
fn fragment_shader() -> &'static str;
|
||||
|
||||
fn new(interact_rect: egui::Rect) -> Self;
|
||||
|
||||
fn write_buffer(&self, queue: &wgpu::Queue, buffer: &wgpu::Buffer, image_size: glam::UVec2);
|
||||
}
|
||||
|
||||
pub struct DrawResources<S: ShaderSettings> {
|
||||
bind_group_layout: wgpu::BindGroupLayout,
|
||||
pub bind_group: wgpu::BindGroup,
|
||||
pub viewport_buffer: wgpu::Buffer,
|
||||
image_buffer: wgpu::Buffer,
|
||||
pub image_size: glam::UVec2,
|
||||
pub compute_pipeline: wgpu::ComputePipeline,
|
||||
pub render_pipeline: wgpu::RenderPipeline,
|
||||
settings: PhantomData<S>,
|
||||
}
|
||||
|
||||
impl<S: ShaderSettings> DrawResources<S> {
|
||||
fn bind_group_layout(device: &wgpu::Device) -> wgpu::BindGroupLayout {
|
||||
device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
|
||||
label: Some("compute_draw"),
|
||||
entries: &[
|
||||
// draw_settings
|
||||
wgpu::BindGroupLayoutEntry {
|
||||
binding: 0,
|
||||
visibility: wgpu::ShaderStages::COMPUTE | wgpu::ShaderStages::FRAGMENT,
|
||||
ty: wgpu::BindingType::Buffer {
|
||||
ty: wgpu::BufferBindingType::Uniform,
|
||||
has_dynamic_offset: false,
|
||||
min_binding_size: None,
|
||||
},
|
||||
count: None,
|
||||
},
|
||||
// image
|
||||
wgpu::BindGroupLayoutEntry {
|
||||
binding: 1,
|
||||
visibility: wgpu::ShaderStages::COMPUTE | wgpu::ShaderStages::FRAGMENT,
|
||||
ty: wgpu::BindingType::Buffer {
|
||||
ty: wgpu::BufferBindingType::Storage { read_only: false },
|
||||
has_dynamic_offset: false,
|
||||
min_binding_size: None,
|
||||
},
|
||||
count: None,
|
||||
},
|
||||
],
|
||||
})
|
||||
}
|
||||
|
||||
fn bind_group(
|
||||
device: &wgpu::Device,
|
||||
bind_group_layout: &wgpu::BindGroupLayout,
|
||||
viewport_buffer: &wgpu::Buffer,
|
||||
image_buffer: &wgpu::Buffer,
|
||||
) -> wgpu::BindGroup {
|
||||
device.create_bind_group(&wgpu::BindGroupDescriptor {
|
||||
label: Some("compute_draw"),
|
||||
layout: bind_group_layout,
|
||||
entries: &[
|
||||
wgpu::BindGroupEntry {
|
||||
binding: 0,
|
||||
resource: viewport_buffer.as_entire_binding(),
|
||||
},
|
||||
wgpu::BindGroupEntry {
|
||||
binding: 1,
|
||||
resource: image_buffer.as_entire_binding(),
|
||||
},
|
||||
],
|
||||
})
|
||||
}
|
||||
|
||||
fn viewport_buffer(device: &wgpu::Device) -> wgpu::Buffer {
|
||||
device.create_buffer(&wgpu::BufferDescriptor {
|
||||
label: Some("viewport"),
|
||||
size: size_of::<S::DrawSettings>() as u64,
|
||||
usage: wgpu::BufferUsages::COPY_DST | wgpu::BufferUsages::UNIFORM,
|
||||
mapped_at_creation: false,
|
||||
})
|
||||
}
|
||||
|
||||
fn image_buffer(device: &wgpu::Device, width: u64, height: u64) -> wgpu::Buffer {
|
||||
device.create_buffer(&wgpu::BufferDescriptor {
|
||||
label: Some("image"),
|
||||
size: width * height * 4 * size_of::<f32>() as u64,
|
||||
usage: wgpu::BufferUsages::STORAGE,
|
||||
mapped_at_creation: false,
|
||||
})
|
||||
}
|
||||
|
||||
fn module(device: &wgpu::Device) -> wgpu::ShaderModule {
|
||||
let module_descriptor = wgpu::include_spirv!(concat!(env!("OUT_DIR"), "/shader.spv"));
|
||||
device.create_shader_module(module_descriptor)
|
||||
}
|
||||
|
||||
fn compute_pipeline(
|
||||
device: &wgpu::Device,
|
||||
module: &wgpu::ShaderModule,
|
||||
bind_group_layout: &wgpu::BindGroupLayout,
|
||||
) -> wgpu::ComputePipeline {
|
||||
let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
|
||||
label: Some("compute"),
|
||||
bind_group_layouts: &[bind_group_layout],
|
||||
push_constant_ranges: &[],
|
||||
});
|
||||
device.create_compute_pipeline(&wgpu::ComputePipelineDescriptor {
|
||||
label: Some("compute"),
|
||||
layout: Some(&pipeline_layout),
|
||||
module: &module,
|
||||
entry_point: Some(S::compute_shader()),
|
||||
compilation_options: Default::default(),
|
||||
cache: None,
|
||||
})
|
||||
}
|
||||
|
||||
fn render_pipeline(
|
||||
device: &wgpu::Device,
|
||||
module: &wgpu::ShaderModule,
|
||||
bind_group_layout: &wgpu::BindGroupLayout,
|
||||
format: &wgpu::TextureFormat,
|
||||
) -> wgpu::RenderPipeline {
|
||||
let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
|
||||
label: Some("draw"),
|
||||
bind_group_layouts: &[bind_group_layout],
|
||||
push_constant_ranges: &[],
|
||||
});
|
||||
device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
|
||||
label: Some("draw"),
|
||||
layout: Some(&pipeline_layout),
|
||||
vertex: wgpu::VertexState {
|
||||
module,
|
||||
entry_point: Some("main_vs"),
|
||||
compilation_options: Default::default(),
|
||||
buffers: &[],
|
||||
},
|
||||
primitive: Default::default(),
|
||||
depth_stencil: None,
|
||||
multisample: Default::default(),
|
||||
fragment: Some(wgpu::FragmentState {
|
||||
module,
|
||||
entry_point: Some(S::fragment_shader()),
|
||||
compilation_options: Default::default(),
|
||||
targets: &[Some((*format).into())],
|
||||
}),
|
||||
multiview: None,
|
||||
cache: None,
|
||||
})
|
||||
}
|
||||
|
||||
pub fn new(
|
||||
device: &wgpu::Device,
|
||||
format: &wgpu::TextureFormat,
|
||||
width: u64,
|
||||
height: u64,
|
||||
) -> Self {
|
||||
let bind_group_layout = Self::bind_group_layout(device);
|
||||
let viewport_buffer = Self::viewport_buffer(device);
|
||||
let image_buffer = Self::image_buffer(device, width, height);
|
||||
let image_size = glam::uvec2(width as u32, height as u32);
|
||||
|
||||
let bind_group =
|
||||
Self::bind_group(device, &bind_group_layout, &viewport_buffer, &image_buffer);
|
||||
|
||||
let module = Self::module(device);
|
||||
let compute_pipeline = Self::compute_pipeline(device, &module, &bind_group_layout);
|
||||
let render_pipeline = Self::render_pipeline(device, &module, &bind_group_layout, format);
|
||||
|
||||
Self {
|
||||
bind_group_layout,
|
||||
bind_group,
|
||||
viewport_buffer,
|
||||
image_buffer,
|
||||
image_size,
|
||||
compute_pipeline,
|
||||
render_pipeline,
|
||||
settings: PhantomData,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn resize(&mut self, device: &wgpu::Device, width: u64, height: u64) {
|
||||
self.image_buffer = Self::image_buffer(device, width, height);
|
||||
self.image_size = glam::uvec2(width as u32, height as u32);
|
||||
self.bind_group = Self::bind_group(
|
||||
device,
|
||||
&self.bind_group_layout,
|
||||
&self.viewport_buffer,
|
||||
&self.image_buffer,
|
||||
);
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,96 @@
|
||||
use crate::draw_resources::ShaderSettings;
|
||||
use glam::UVec2;
|
||||
use shader::{DrawRect, DrawSized};
|
||||
use wgpu::{Buffer, Queue};
|
||||
|
||||
pub struct ShaderBounding {
|
||||
draw_size: egui::Vec2,
|
||||
}
|
||||
|
||||
impl ShaderSettings for ShaderBounding {
|
||||
type DrawSettings = DrawSized;
|
||||
|
||||
fn compute_shader() -> &'static str {
|
||||
"main_cs_bounding"
|
||||
}
|
||||
|
||||
fn fragment_shader() -> &'static str {
|
||||
"main_fs_size"
|
||||
}
|
||||
|
||||
fn new(interact_rect: egui::Rect) -> Self {
|
||||
Self {
|
||||
draw_size: interact_rect.size()
|
||||
}
|
||||
}
|
||||
|
||||
fn write_buffer(&self, queue: &Queue, buffer: &Buffer, image_size: glam::UVec2) {
|
||||
let draw_settings = DrawSized {
|
||||
image_size,
|
||||
viewport_size: glam::uvec2(self.draw_size.x as u32, self.draw_size.y as u32),
|
||||
};
|
||||
queue.write_buffer(&buffer, 0, bytemuck::cast_slice(&[draw_settings]));
|
||||
}
|
||||
}
|
||||
|
||||
pub struct ShaderOffset {
|
||||
draw_rect: egui::Rect,
|
||||
}
|
||||
|
||||
impl ShaderSettings for ShaderOffset {
|
||||
type DrawSettings = DrawRect;
|
||||
|
||||
fn compute_shader() -> &'static str {
|
||||
"main_cs_bounding"
|
||||
}
|
||||
|
||||
fn fragment_shader() -> &'static str {
|
||||
"main_fs_rect"
|
||||
}
|
||||
|
||||
fn new(interact_rect: egui::Rect) -> Self {
|
||||
Self { draw_rect: interact_rect }
|
||||
}
|
||||
|
||||
fn write_buffer(&self, queue: &Queue, buffer: &Buffer, image_size: UVec2) {
|
||||
let viewport_size = glam::uvec2(self.draw_rect.size().x as u32, self.draw_rect.size().y as u32);
|
||||
let viewport_offset = glam::uvec2(self.draw_rect.min.x as u32, self.draw_rect.min.y as u32);
|
||||
let draw_settings = DrawRect {
|
||||
image_size,
|
||||
viewport_size,
|
||||
viewport_offset
|
||||
};
|
||||
queue.write_buffer(&buffer, 0, bytemuck::cast_slice(&[draw_settings]));
|
||||
}
|
||||
}
|
||||
|
||||
pub struct ShaderOffsetBlocks {
|
||||
draw_rect: egui::Rect,
|
||||
}
|
||||
|
||||
impl ShaderSettings for ShaderOffsetBlocks {
|
||||
type DrawSettings = DrawRect;
|
||||
|
||||
fn compute_shader() -> &'static str {
|
||||
"main_cs_blocks"
|
||||
}
|
||||
|
||||
fn fragment_shader() -> &'static str {
|
||||
"main_fs_rect"
|
||||
}
|
||||
|
||||
fn new(interact_rect: egui::Rect) -> Self {
|
||||
Self { draw_rect: interact_rect }
|
||||
}
|
||||
|
||||
fn write_buffer(&self, queue: &Queue, buffer: &Buffer, image_size: UVec2) {
|
||||
let viewport_size = glam::uvec2(self.draw_rect.size().x as u32, self.draw_rect.size().y as u32);
|
||||
let viewport_offset = glam::uvec2(self.draw_rect.min.x as u32, self.draw_rect.min.y as u32);
|
||||
let draw_settings = DrawRect {
|
||||
image_size,
|
||||
viewport_size,
|
||||
viewport_offset
|
||||
};
|
||||
queue.write_buffer(&buffer, 0, bytemuck::cast_slice(&[draw_settings]));
|
||||
}
|
||||
}
|
||||
158
blog/2025-03-30-draw-compute-shader/draw-compute/src/lib.rs
Normal file
158
blog/2025-03-30-draw-compute-shader/draw-compute/src/lib.rs
Normal file
@ -0,0 +1,158 @@
|
||||
mod draw_resources;
|
||||
pub mod draw_shaders;
|
||||
|
||||
use std::marker::PhantomData;
|
||||
use eframe::Frame;
|
||||
use egui::{Context, Sense};
|
||||
|
||||
use crate::draw_resources::{DrawResources, ShaderSettings};
|
||||
use eframe::epaint::PaintCallbackInfo;
|
||||
use egui_wgpu::{CallbackResources, CallbackTrait, ScreenDescriptor};
|
||||
use wgpu::{CommandBuffer, CommandEncoder, Device, Queue, RenderPass};
|
||||
|
||||
struct DrawCallback<S> {
|
||||
interact_rect: egui::Rect,
|
||||
interact_resize: bool,
|
||||
settings: S,
|
||||
}
|
||||
|
||||
impl<S: ShaderSettings> DrawCallback<S> {
|
||||
fn new(interact_rect: egui::Rect, interact_resize: bool) -> Self {
|
||||
Self {
|
||||
interact_rect,
|
||||
interact_resize,
|
||||
settings: S::new(interact_rect),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<S: ShaderSettings + Send + Sync + 'static> CallbackTrait for DrawCallback<S> {
|
||||
fn prepare(
|
||||
&self,
|
||||
device: &Device,
|
||||
queue: &Queue,
|
||||
_screen_descriptor: &ScreenDescriptor,
|
||||
egui_encoder: &mut CommandEncoder,
|
||||
callback_resources: &mut CallbackResources,
|
||||
) -> Vec<CommandBuffer> {
|
||||
let resources = callback_resources
|
||||
.get_mut::<DrawResources<S>>()
|
||||
.expect("missing draw resources");
|
||||
|
||||
if self.interact_resize {
|
||||
resources.resize(
|
||||
device,
|
||||
self.interact_rect.width() as u64,
|
||||
self.interact_rect.height() as u64,
|
||||
);
|
||||
}
|
||||
|
||||
self.settings.write_buffer(queue, &resources.viewport_buffer, resources.image_size);
|
||||
|
||||
if self.interact_resize {
|
||||
let mut compute_pass = egui_encoder.begin_compute_pass(&wgpu::ComputePassDescriptor {
|
||||
label: Some("compute"),
|
||||
timestamp_writes: None,
|
||||
});
|
||||
|
||||
compute_pass.set_pipeline(&resources.compute_pipeline);
|
||||
compute_pass.set_bind_group(0, &resources.bind_group, &[]);
|
||||
compute_pass.dispatch_workgroups(1, 1, 1);
|
||||
}
|
||||
|
||||
vec![]
|
||||
}
|
||||
|
||||
fn paint(
|
||||
&self,
|
||||
_info: PaintCallbackInfo,
|
||||
render_pass: &mut RenderPass<'static>,
|
||||
callback_resources: &CallbackResources,
|
||||
) {
|
||||
let resources = callback_resources.get::<DrawResources<S>>().unwrap();
|
||||
|
||||
render_pass.set_pipeline(&resources.render_pipeline);
|
||||
render_pass.set_bind_group(0, &resources.bind_group, &[]);
|
||||
render_pass.draw(0..3, 0..1);
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone)]
|
||||
pub struct ComputeDraw<S> {
|
||||
initial_draw: bool,
|
||||
settings: PhantomData<S>,
|
||||
}
|
||||
|
||||
impl <S: ShaderSettings> ComputeDraw<S> {
|
||||
pub fn new() -> Self {
|
||||
ComputeDraw {
|
||||
initial_draw: true,
|
||||
settings: PhantomData,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<S: ShaderSettings + 'static> eframe::App for ComputeDraw<S> {
|
||||
fn update(&mut self, ctx: &Context, frame: &mut Frame) {
|
||||
let initial_draw = self.initial_draw;
|
||||
self.initial_draw = false;
|
||||
|
||||
if initial_draw {
|
||||
let wgpu_render_state = frame.wgpu_render_state().expect("missing WGPU state");
|
||||
let device = wgpu_render_state.device.clone();
|
||||
let format = wgpu_render_state.target_format.clone();
|
||||
let callback_resources = &mut wgpu_render_state
|
||||
.renderer
|
||||
.as_ref()
|
||||
.write()
|
||||
.callback_resources;
|
||||
|
||||
// Guess an initial size for initializing GPU resources, it will be adjusted later
|
||||
callback_resources.insert(DrawResources::<S>::new(&device, &format, 800, 600));
|
||||
}
|
||||
|
||||
/*
|
||||
egui::TopBottomPanel::bottom("bottom").show(ctx, |ui| {
|
||||
let wgpu_render_state = frame.wgpu_render_state().expect("missing WGPU state");
|
||||
let image_size = wgpu_render_state
|
||||
.renderer
|
||||
.as_ref()
|
||||
.read()
|
||||
.callback_resources
|
||||
.get::<DrawResources<DrawSimple>>()
|
||||
.unwrap()
|
||||
.image_size;
|
||||
|
||||
ui.label(format!("Viewport: image={image_size}"))
|
||||
});
|
||||
*/
|
||||
|
||||
egui::CentralPanel::default().show(ctx, |ui| {
|
||||
egui::Frame::canvas(ui.style()).show(ui, |ui| {
|
||||
let interact_rect = ui.available_rect_before_wrap();
|
||||
let (response, painter) = ui.allocate_painter(interact_rect.size(), Sense::click());
|
||||
|
||||
painter.add(egui_wgpu::Callback::new_paint_callback(
|
||||
interact_rect,
|
||||
DrawCallback::<S>::new(interact_rect, initial_draw || response.clicked()),
|
||||
))
|
||||
});
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
fn main() {
|
||||
let native_options = eframe::NativeOptions {
|
||||
renderer: eframe::Renderer::Wgpu,
|
||||
..Default::default()
|
||||
};
|
||||
|
||||
eframe::run_native(
|
||||
"Compute Draw",
|
||||
native_options,
|
||||
Box::new(|_cc| Ok(Box::new(ComputeDraw { initial_draw: true }))),
|
||||
)
|
||||
.unwrap()
|
||||
}
|
||||
*/
|
||||
107
blog/2025-03-30-draw-compute-shader/index.mdx
Normal file
107
blog/2025-03-30-draw-compute-shader/index.mdx
Normal file
@ -0,0 +1,107 @@
|
||||
---
|
||||
slug: 2025/04/drawing-compute-shader
|
||||
title: "Drawing with a compute shader"
|
||||
date: 2025-04-27 12:00:00
|
||||
authors: [bspeice]
|
||||
tags: []
|
||||
---
|
||||
|
||||
My goal studying the [fractal flame algorithm](../2024-11-15-playing-with-fire/1-introduction/index.mdx) was not just
|
||||
to satisfy an inner curiosity. The algorithm has been ported to GPUs, but those implementations require either CUDA
|
||||
(for [flam4](https://sourceforge.net/projects/flam4/)) or OpenCL (for [Fractorium](http://fractorium.com/)).
|
||||
I'd like to try implementing a fractal flame editor using standard GPU shaders.
|
||||
|
||||
The first step is showing an application window and drawing to it using a GPU. This post covers:
|
||||
|
||||
- Setting up an application window using [`egui`](https://github.com/emilk/egui)
|
||||
- Writing and compiling shaders written in Rust with [Rust GPU](https://rust-gpu.github.io/)
|
||||
- Rendering an image using a compute shader, and displaying the image using a fragment shader
|
||||
|
||||
Not that interesting if you're already familiar with shaders and GPU programming, but I found myself wishing
|
||||
there were more detailed resources on how to get started.
|
||||
|
||||
TODO: Image of the end goal here?
|
||||
|
||||
<!-- truncate -->
|
||||
|
||||
## GUIs in Rust with `egui`
|
||||
|
||||
:::note
|
||||
This section focuses on creating an application that displays the GPU results. If that's not your style,
|
||||
you can [skip ahead to the shaders](#shaders-in-rust).
|
||||
:::
|
||||
|
||||
## Shaders in Rust
|
||||
|
||||
All the code in this post is written in Rust - including the parts that run on a GPU. Rust GPU
|
||||
compiles Rust code into a shader that runs on a graphics card. There are three primary shader types used:
|
||||
|
||||
- [Compute shader](https://www.khronos.org/opengl/wiki/Compute_Shader); can run arbitrary computation, but can't
|
||||
display to a screen
|
||||
- [Vertex shader](https://www.khronos.org/opengl/wiki/Vertex_Shader); used to define the output image area
|
||||
- [Fragment shader](https://www.khronos.org/opengl/wiki/Fragment_Shader); draws an image by returning
|
||||
a color for each pixel
|
||||
|
||||
The application will output pixel information into an image buffer using a compute shader, then display that image
|
||||
using a combination of vertex and fragment shaders.
|
||||
|
||||
### Compute shader
|
||||
|
||||
<details>
|
||||
<summary>Why the focus on compute shaders if they can't display an image on screen? Why not use a fragment shader?</summary>
|
||||
|
||||
The answer is related to how fragment shaders run on a graphics card. Fragment shaders are functions that receive
|
||||
an input coordinate and return the color of that coordinate in the output. By running the fragment shader once per
|
||||
pixel, we build up an image to display.
|
||||
|
||||
This "run once per pixel" mode maps poorly to the fractal flame algorithm. Specifically, the "[chaos game](https://en.wikipedia.org/wiki/Chaos_game)"
|
||||
jumps around to random locations; only by iterating many times can we figure out what the color of a pixel
|
||||
should be. However, once the fragment shader ends, we'd lose all the information gathered about the other pixels.
|
||||
|
||||
Using a compute shader avoids this "discarded information" problem. Because it can run arbitrary computations,
|
||||
we can record information about the whole image and make it available later. Compute shaders are overkill
|
||||
for the examples in this blog post, but are important to a GPU implementation of the fractal flame algorithm.
|
||||
</details>
|
||||
|
||||
The first compute shader example is nothing special; it draws a white rectangle at the edges of an image:
|
||||
|
||||
```rust
|
||||
const BLACK: glam::Vec4 = glam::vec4(0.0, 0.0, 0.0, 1.0);
|
||||
const WHITE: glam::Vec4 = glam::vec4(1.0, 1.0, 1.0, 1.0);
|
||||
|
||||
pub struct DrawSized {
|
||||
pub image_size: glam::UVec2,
|
||||
pub viewport_size: glam::UVec2,
|
||||
}
|
||||
|
||||
// The `#[spirv]` annotations describe some details of how this code should run
|
||||
// on the GPU; they can be ignored for now
|
||||
|
||||
#[spirv(compute(threads(1)))]
|
||||
pub fn main_cs_bounding(
|
||||
#[spirv(uniform, descriptor_set = 0, binding = 0)] viewport: &DrawSized,
|
||||
#[spirv(storage_buffer, descriptor_set = 0, binding = 1)] image: &mut [glam::Vec4],
|
||||
) {
|
||||
let width = viewport.image_size.x as usize;
|
||||
let height = viewport.image_size.y as usize;
|
||||
|
||||
for x in 0..width {
|
||||
for y in 0..height {
|
||||
image[image_index(x, y, width)] =
|
||||
if x == 0 || x == width - 1 || y == 0 || y == height - 1 {
|
||||
WHITE
|
||||
} else {
|
||||
BLACK
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
After running this code, the contents of the `image` buffer should look something like this:
|
||||
|
||||
|
||||
|
||||
## Vertex/Fragment shaders
|
||||
|
||||
|
||||
@ -37,6 +37,10 @@ const config: Config = {
|
||||
docs: false,
|
||||
blog: {
|
||||
routeBasePath: '/',
|
||||
exclude: [
|
||||
"**/_*.md",
|
||||
"**/target/**"
|
||||
],
|
||||
blogSidebarTitle: 'All posts',
|
||||
blogSidebarCount: 'ALL',
|
||||
showReadingTime: true,
|
||||
|
||||
Reference in New Issue
Block a user