Merge pull request #17 from freesig/include

Include

src/compiler.rs

@@ -1,8 +1,9 @@
+use crate::error::CompileError;
+use shaderc::{IncludeType, ResolvedInclude};
+use shaderc::{ShaderKind, CompileOptions};
 use std::fs::File;
-use std::path::Path;
-use shaderc::ShaderKind;
 use std::io::Read;
-use crate::error::CompileError;
+use std::path::{Path, PathBuf};
 
 pub fn compile<T>(path: T, shader_kind: ShaderKind) -> Result<Vec<u32>, CompileError>
 where
@@ -10,16 +11,58 @@ where
 {
     // TODO Probably shouldn't create this every time.
     let mut compiler = shaderc::Compiler::new().ok_or(CompileError::CreateCompiler)?;
+    let mut options = CompileOptions::new().ok_or(CompileError::CreateCompiler)?;
     let mut f = File::open(&path).map_err(CompileError::Open)?;
     let mut src = String::new();
     f.read_to_string(&mut src).map_err(CompileError::Open)?;
-    let result = compiler.compile_into_spirv(
+    options.set_include_callback(|path, include_type, folder_path, depth| {
+        get_include(path, include_type, folder_path, depth)
+    });
+    let result = compiler
+        .compile_into_spirv(
             src.as_str(),
             shader_kind,
             path.as_ref().to_str().ok_or(CompileError::InvalidPath)?,
             "main",
-        None,
-    ).map_err(CompileError::Compile)?;
+            Some(&options),
+        )
+        .map_err(CompileError::Compile)?;
     let data = result.as_binary();
     Ok(data.to_owned())
 }
+
+fn get_include(
+    path: &str,
+    include_type: IncludeType,
+    folder_path: &str,
+    depth: usize,
+) -> Result<ResolvedInclude, String> {
+    match include_type {
+        IncludeType::Relative => {
+            let p = Path::new(path);
+            let mut folder = PathBuf::from(folder_path);
+            folder.pop();
+            folder.push(p);
+            let p = folder;
+            if !p.is_file() {
+                return Err("Include doesn't point to file".to_string());
+            }
+
+            let resolved_name = p
+                .to_str()
+                .ok_or("Path has invalid characters".to_string())?
+                .to_owned();
+            let p = p.canonicalize().map_err(|_|"Failed to parse include path".to_string())?;
+            let mut content = String::new();
+            File::open(p)
+                .map_err(|_|"Couldn't open include directory".to_string())?
+                .read_to_string(&mut content)
+                .map_err(|_|"Failed to read included shader".to_string())?;
+            Ok(ResolvedInclude {
+                resolved_name,
+                content,
+            })
+        }
+        IncludeType::Standard => Err("Standard includes are unimplemented".to_string()),
+    }
+}