Build various target libraries from source

.gitignore

@@ -1,4 +1,4 @@
 /target
 **/*.rs.bk
 Cargo.lock
-.cargo/config
+.cargo/config

.gitmodules

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

Cargo.toml

@@ -1,10 +1,38 @@
 [package]
 name = "bevy-glsl-to-spirv"
-version = "0.2.0"
-authors = ["Pierre Krieger <[email protected]>", "The vulkano contributors", "Carter Anderson <[email protected]>", "Nicholas Rishel <[email protected]>"]
+version = "0.2.2"
+authors = ["Pierre Krieger <[email protected]>", "The vulkano contributors", "Carter Anderson <[email protected]>", "Nicholas Rishel <[email protected]>", "Martin Krisnanto Putra <[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"]
 edition = "2018"
+
+[dependencies]
+# Default panic message handling
+glslang_actual_builder = { path = "glslang_actual_builder", default-features = false }
+
+# Supported Platforms
+[target.x86_64-pc-windows-msvc.dependencies]
+glslang_actual_builder = { path = "glslang_actual_builder", default-features = false }
+
+[target.x86_64-unknown-linux-gnu.dependencies]
+glslang_actual_builder = { path = "glslang_actual_builder", default-features = false }
+
+[target.x86_64-apple-darwin.dependencies]
+glslang_actual_builder = { path = "glslang_actual_builder", default-features = false }
+
+[target.aarch64-linux-android.dependencies]
+glslang_actual_builder = { path = "glslang_actual_builder", default-features = false }
+
+[target.armv7-linux-androideabi.dependencies]
+glslang_actual_builder = { path = "glslang_actual_builder", default-features = false }
+
+[target.i686-pc-windows-msvc.dependencies]
+glslang_actual_builder = { path = "glslang_actual_builder", features = ["build-from-source"] }
+
+[target.x86_64-pc-windows-gnu.dependencies]
+glslang_actual_builder = { path = "glslang_actual_builder", features = ["build-from-source"] }
+
+[target.i686-pc-windows-gnu.dependencies]
+glslang_actual_builder = { path = "glslang_actual_builder", features = ["build-from-source"] }

glslang_actual_builder/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "glslang_actual_builder"
+version = "0.1.0"
+authors = ["Pierre Krieger <[email protected]>", "The vulkano contributors", "Carter Anderson <[email protected]>", "Nicholas Rishel <[email protected]>", "Martin Krisnanto Putra <[email protected]>"]
+description = "Internal builder"
+repository = "https://github.com/cart/glsl-to-spirv"
+license = "MIT/Apache-2.0"
+build = "build.rs"
+categories = ["rendering::graphics-api"]
+edition = "2018"
+
+[features]
+default = []
+build-from-source = ["cmake", "cc"]
+
+[build-dependencies]
+cmake = { version = "0.1.45", optional = true }
+cc = { version = "1.0.66", features = ["parallel"], optional = true }

glslang_actual_builder/build.rs

@@ -0,0 +1,116 @@
+use std::path::Path;
+
+fn main() {
+    let target: &str = &std::env::var("TARGET").unwrap();
+    let cargo_dir = Path::new(env!("CARGO_MANIFEST_DIR"));
+    let bin_dir = match target {
+        "x86_64-pc-windows-msvc" => cargo_dir.join("build").join("windows"),
+        "x86_64-unknown-linux-gnu" => cargo_dir.join("build").join("linux"),
+        "x86_64-apple-darwin" => cargo_dir.join("build").join("osx"),
+        "aarch64-linux-android" => cargo_dir.join("build").join("android-arm64-v8a"),
+        "armv7-linux-androideabi" => cargo_dir.join("build").join("android-armeabi-v7a"),
+        "i686-pc-windows-msvc" => build::build_libraries(&target),
+        "x86_64-pc-windows-gnu" => build::build_libraries(&target),
+        "i686-pc-windows-gnu" => build::build_libraries(&target),
+        _ => panic!("Unsupported target {}", target),
+    };
+
+    // Link order matters, make sure dependants 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");
+    }
+    if target.ends_with("-pc-windows-gnu") {
+        println!("cargo:rustc-link-lib=dylib=stdc++");
+    }
+}
+
+#[cfg(feature = "build-from-source")]
+mod build {
+    use std::path::Path;
+    use std::path::PathBuf;
+
+    /// Build target libraries if required,
+    /// and returns the location of library files
+    pub fn build_libraries(_target: &str) -> PathBuf {
+        // Prepare directories
+        let cargo_dir = Path::new(env!("CARGO_MANIFEST_DIR"));
+        let source_dir = cargo_dir.join("glslang");
+
+        let out_dir_env = std::env::var("OUT_DIR").unwrap();
+        let out_dir = Path::new(&out_dir_env);
+        let install_dir = out_dir.join("install");
+        let library_dir = install_dir.join("lib");
+
+        // Re-use libraries if they exist
+        if let Ok(mut entry) = library_dir.read_dir() {
+            if entry.next().is_some() {
+                // a file exists in the path
+                return library_dir;
+            }
+        }
+
+        // Check glslang folder is initialized
+        let cmakelists = source_dir.join("CMakeLists.txt");
+        if !cmakelists.exists() {
+            panic!("Please make sure the glslang submodule is initialized");
+        }
+
+        // Set up "install" subdirectory
+        match std::fs::create_dir_all(&install_dir) {
+            Ok(_) => {}
+            Err(err) => panic!("Unable to create directory: {:?}", err),
+        }
+
+        // Common configuration
+        let mut config = cmake::Config::new(&source_dir);
+        config
+            .define("CMAKE_INSTALL_PREFIX", &install_dir)
+            .define("CMAKE_TRY_COMPILE_TARGET_TYPE", "STATIC_LIBRARY")
+            .define("ENABLE_GLSLANG_BINARIES", "OFF")
+            .profile("Release")
+            .build_target("install");
+
+        // Build config
+        config.build();
+
+        // Add vendor suffix to all library names
+        for path in library_dir
+            .read_dir()
+            .expect("Unable to locate compiled glslang libraries")
+        {
+            let filename = path.unwrap().path();
+            let metadata = std::fs::metadata(&filename).unwrap();
+            if metadata.is_file() {
+                let extension = filename.extension().unwrap().to_str().unwrap();
+                let new_extension = format!("glsltospirv.{}", extension);
+                let new_name = filename.with_extension(new_extension);
+                std::fs::copy(&filename, &new_name)
+                    .expect("Failed to rename a glslang library for linking");
+            }
+        }
+
+        library_dir
+    }
+}
+
+#[cfg(not(feature = "build-from-source"))]
+mod build {
+    use std::path::PathBuf;
+
+    /// Build target libraries if required,
+    /// and returns the location of library files
+    pub fn build_libraries(target: &str) -> PathBuf {
+        panic!("Platform {} must build glslang from source.", &target);
+    }
+}