reflect: add API to compile to DXIL

librashader-reflect/Cargo.toml

@@ -23,11 +23,13 @@ librashader-common = { path = "../librashader-common", version = "0.1.0-beta.10"
 librashader-preprocess = { path = "../librashader-preprocess", version = "0.1.0-beta.10" }
 librashader-presets = { path = "../librashader-presets", version = "0.1.0-beta.10" }
 
+spirv-to-dxil = { version = "0.2", optional = true }
 naga = { version = "0.10.0", features = ["glsl-in", "spv-in", "spv-out", "glsl-out", "wgsl-out"], optional = true }
 
 [features]
-default = []
+default = ["dxil"]
 unstable-naga = [ "naga" ]
 standalone = ["shaderc/build-from-source"]
+dxil = ["spirv-to-dxil"]
 
 [dev-dependencies]

librashader-reflect/src/back/dxil.rs

@@ -0,0 +1,77 @@
+pub use spirv_to_dxil::DxilObject;
+pub use spirv_to_dxil::ShaderModel;
+use spirv_to_dxil::{ShaderStage, ValidatorVersion};
+use crate::back::{CompilerBackend, CompileShader, FromCompilation, ShaderCompilerOutput};
+use crate::back::spirv::WriteSpirV;
+
+use crate::back::targets::{DXIL, OutputTarget};
+use crate::error::{ShaderCompileError, ShaderReflectError};
+use crate::front::GlslangCompilation;
+use crate::reflect::cross::GlslReflect;
+use crate::reflect::ReflectShader;
+
+impl OutputTarget for DXIL {
+    type Output = DxilObject;
+}
+
+impl FromCompilation<GlslangCompilation> for DXIL {
+    type Target = DXIL;
+    type Options = Option<ShaderModel>;
+    type Context = ();
+    type Output = impl CompileShader<Self::Target, Options = Self::Options, Context = Self::Context>
+    + ReflectShader;
+
+    fn from_compilation(
+        compile: GlslangCompilation,
+    ) -> Result<CompilerBackend<Self::Output>, ShaderReflectError> {
+        let vertex = compile.vertex.as_binary().to_vec();
+        let fragment = compile.fragment.as_binary().to_vec();
+        let reflect = GlslReflect::try_from(compile)?;
+        Ok(CompilerBackend {
+            // we can just reuse WriteSpirV as the backend.
+            backend: WriteSpirV {
+                reflect,
+                vertex,
+                fragment,
+            },
+        })
+    }
+}
+
+impl CompileShader<DXIL> for WriteSpirV {
+    type Options = Option<ShaderModel>;
+    type Context = ();
+
+    fn compile(
+        self,
+        options: Self::Options,
+    ) -> Result<ShaderCompilerOutput<DxilObject, Self::Context>, ShaderCompileError> {
+        let sm = options.unwrap_or(ShaderModel::ShaderModel6_0);
+
+        // todo: do we want to allow other entry point names?
+        let vertex =
+            spirv_to_dxil::spirv_to_dxil(&self.vertex,
+                                         None, "main",
+                                         ShaderStage::Vertex,
+                                         sm,
+                                         ValidatorVersion::None,
+                                         Default::default())
+                .map_err(|s| ShaderCompileError::SpirvToDxilCompileError(s))?;
+
+
+        let fragment =
+            spirv_to_dxil::spirv_to_dxil(&self.fragment,
+                                         None, "main",
+                                         ShaderStage::Fragment,
+                                         ShaderModel::ShaderModel6_0,
+                                         ValidatorVersion::None,
+                                         Default::default())
+                .map_err(|s| ShaderCompileError::SpirvToDxilCompileError(s))?;
+
+        Ok(ShaderCompilerOutput {
+            vertex,
+            fragment,
+            context: (),
+        })
+    }
+}

librashader-reflect/src/back/mod.rs

@@ -1,6 +1,7 @@
 pub mod cross;
 mod spirv;
 pub mod targets;
+pub mod dxil;
 
 use crate::back::targets::OutputTarget;
 use crate::error::{ShaderCompileError, ShaderReflectError};

librashader-reflect/src/back/spirv.rs

@@ -6,11 +6,11 @@ use crate::reflect::cross::GlslReflect;
 use crate::reflect::semantics::ShaderSemantics;
 use crate::reflect::{ReflectShader, ShaderReflection};
 
-struct WriteSpirV {
+pub(crate) struct WriteSpirV {
     // rely on GLSL to provide out reflection but we don't actually need the AST.
-    reflect: GlslReflect,
+    pub(crate) reflect: GlslReflect,
-    vertex: Vec<u32>,
+    pub(crate) vertex: Vec<u32>,
-    fragment: Vec<u32>,
+    pub(crate) fragment: Vec<u32>,
 }
 
 impl FromCompilation<GlslangCompilation> for SPIRV {

librashader-reflect/src/back/targets.rs

@@ -10,8 +10,13 @@ pub struct GLSL;
 pub struct HLSL;
 /// Shader compiler target for SPIR-V.
 pub struct SPIRV;
-/// Shader compiler target for MSL
+/// Shader compiler target for MSL.
 pub struct MSL;
+/// Shader compiler target for DXIL.
+///
+/// The resulting DXIL object is always unvalidated and
+/// must be validated using platform APIs before usage.
+pub struct DXIL;
 
 impl OutputTarget for GLSL {
     type Output = String;

librashader-reflect/src/error.rs

@@ -21,6 +21,11 @@ pub enum ShaderCompileError {
     /// Error when transpiling from spirv-cross.
     #[error("cross")]
     SpirvCrossCompileError(#[from] spirv_cross::ErrorCode),
+
+    /// Error when transpiling from spirv-to-dxil
+    #[cfg(feature = "dxil")]
+    #[error("spirv-to-dxil")]
+    SpirvToDxilCompileError(String),
 }
 
 /// The error kind encountered when reflecting shader semantics.

librashader/src/lib.rs

@@ -153,6 +153,16 @@ pub mod reflect {
 
         pub use librashader_reflect::reflect::cross::CompiledProgram;
     }
+
+    /// DXIL reflection via spirv-to-dxil.
+    pub mod dxil {
+        /// The maximum shader model to use when compiling the DXIL blob.
+        pub use librashader_reflect::back::dxil::ShaderModel;
+
+        /// A compiled DXIL artifact.
+        pub use librashader_reflect::back::dxil::DxilObject;
+    }
+
     pub use librashader_reflect::reflect::semantics::BindingMeta;
 
     pub use librashader_reflect::reflect::presets::{CompilePresetTarget, ShaderPassArtifact};