Refactor crate to use glslang static libraries

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "glslang"]
+	path = glslang
+	url = https://github.com/KhronosGroup/glslang.git

Cargo.toml

@@ -1,15 +1,10 @@
 [package]
 name = "bevy-glsl-to-spirv"
 version = "0.1.7"
-authors = ["Pierre Krieger <[email protected]>", "The vulkano contributors", "Carter Anderson <[email protected]>"]
-repository = "https://github.com/vulkano-rs/vulkano"
-description = "Deprecated. Use shaderc-rs instead."
+authors = ["Pierre Krieger <[email protected]>", "The vulkano contributors", "Carter Anderson <[email protected]>", "Nicholas Rishel <[email protected]>"]
+description = "Deprecated. This crate is a temporary measure until native rust shader compilation like https://github.com/gfx-rs/naga lands."
+repository = "https://github.com/cart/glsl-to-spirv"
 license = "MIT/Apache-2.0"
 build = "build/build.rs"
 categories = ["rendering::graphics-api"]
-
-[dependencies]
-tempfile = "3"
-
-[build-dependencies]
-cmake = "0.1.27"
+edition = "2018"

build/build.rs

@@ -1,35 +1,42 @@
-extern crate cmake;
-
 use std::env;
-use std::fs;
-use std::path::Path;
-use std::process::Command;
+use std::path::PathBuf;
 
 fn main() {
-    println!("cargo:rerun-if-changed=build/glslangValidator.exe");
-
     let target = env::var("TARGET").unwrap();
-    let out_file = Path::new(&env::var("OUT_DIR").unwrap()).join("glslang_validator");
+    let mut bin_dir = PathBuf::from(&env::var("CARGO_MANIFEST_DIR").unwrap());
+    bin_dir.push("build");
 
-    let path = if target.contains("windows") {
-        Path::new("build/glslangValidator.exe").to_owned()
-    } else if target.contains("linux") {
-        Path::new("build/glslangValidatorLinux").to_owned()
-    } else if target.contains("apple-darwin") {
-        Path::new("build/glslangValidatorOsx").to_owned()
+    if target.contains("x86_64-pc-windows-msvc") {
+        bin_dir.push("windows");
+    } else if target.contains("x86_64-unknown-linux-gnu") {
+        bin_dir.push("linux");
+    } else if target.contains("x86_64-apple-darwin") {
+        bin_dir.push("osx");
+    } else if target.contains("android") {
+        if target.contains("aarch64") {
+            bin_dir.push("android-arm64-v8a");
+        } else if target.contains("armv7") {
+            bin_dir.push("android-armeabi-v7a");
+        } else {
+            panic!("Missing Android target support {}", target);
+        }
     } else {
-        // Try to initialize submodules. Don't care if it fails, since this code also runs for
-        // the crates.io package.
-        let _ = Command::new("git")
-            .arg("submodule")
-            .arg("update")
-            .arg("--init")
-            .status();
-        cmake::build("glslang");
-        Path::new(&env::var("OUT_DIR").unwrap())
-            .join("bin")
-            .join("glslangValidator")
+        panic!("Missing target support {}", target);
     };
 
-    fs::copy(&path, &out_file).expect("failed to copy executable");
+    // Link order matters, make sure dependents are linked before their dependencies.
+    println!("cargo:rustc-link-search={}", bin_dir.to_str().unwrap());
+    println!("cargo:rustc-link-lib=glslang.glsltospirv");
+    println!("cargo:rustc-link-lib=HLSL.glsltospirv");
+    println!("cargo:rustc-link-lib=OGLCompiler.glsltospirv");
+    println!("cargo:rustc-link-lib=OSDependent.glsltospirv");
+    println!("cargo:rustc-link-lib=SPIRV.glsltospirv");
+    println!("cargo:rustc-link-lib=SPVRemapper.glsltospirv");
+    if target.contains("x86_64-unknown-linux-gnu") || target.contains("x86_64-apple-darwin") {
+        println!("cargo:rustc-link-lib=SPIRV-Tools-opt.glsltospirv");
+        println!("cargo:rustc-link-lib=SPIRV-Tools.glsltospirv");
+    }
+    if target.contains("android") {
+        println!("cargo:rustc-link-lib=c++_shared");
+    }
 }