1 files changed, 82 insertions, 0 deletions
diff --git a/adapters/fparkan-render-vulkan/src/shader.rs b/adapters/fparkan-render-vulkan/src/shader.rs
new file mode 100644
index 0000000..2e3184a
--- /dev/null
+++ b/adapters/fparkan-render-vulkan/src/shader.rs
@@ -0,0 +1,82 @@
+use crate::ffi::{
+    SPIRV_MAGIC, SPIRV_VERSION_1_0, TRIANGLE_FRAGMENT_SHADER_WORDS, TRIANGLE_VERTEX_SHADER_WORDS,
+};
+
+/// Error found while checking a checked-in SPIR-V module.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum VulkanShaderError {
+    /// SPIR-V module is too short to contain a header.
+    TooShort {
+        /// Shader name.
+        name: &'static str,
+    },
+    /// SPIR-V module has an invalid magic word.
+    InvalidMagic {
+        /// Shader name.
+        name: &'static str,
+        /// Found magic word.
+        found: u32,
+    },
+    /// SPIR-V module version is below 1.0.
+    UnsupportedVersion {
+        /// Shader name.
+        name: &'static str,
+        /// Found version word.
+        found: u32,
+    },
+    /// SPIR-V module declares an invalid bound.
+    InvalidBound {
+        /// Shader name.
+        name: &'static str,
+    },
+}
+
+impl std::fmt::Display for VulkanShaderError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::TooShort { name } => write!(f, "shader {name} SPIR-V module is too short"),
+            Self::InvalidMagic { name, found } => {
+                write!(f, "shader {name} has invalid SPIR-V magic 0x{found:08x}")
+            }
+            Self::UnsupportedVersion { name, found } => write!(
+                f,
+                "shader {name} has unsupported SPIR-V version 0x{found:08x}"
+            ),
+            Self::InvalidBound { name } => write!(f, "shader {name} has invalid SPIR-V bound"),
+        }
+    }
+}
+
+impl std::error::Error for VulkanShaderError {}
+
+/// Checks the checked-in triangle shader containers before creating a pipeline.
+pub(crate) fn validate_triangle_shaders() -> Result<(), VulkanShaderError> {
+    validate_spirv_container("triangle.vert", TRIANGLE_VERTEX_SHADER_WORDS)?;
+    validate_spirv_container("triangle.frag", TRIANGLE_FRAGMENT_SHADER_WORDS)?;
+    Ok(())
+}
+
+pub(crate) fn validate_spirv_container(
+    name: &'static str,
+    words: &[u32],
+) -> Result<(), VulkanShaderError> {
+    if words.len() < 5 {
+        return Err(VulkanShaderError::TooShort { name });
+    }
+    if words[0] != SPIRV_MAGIC {
+        return Err(VulkanShaderError::InvalidMagic {
+            name,
+            found: words[0],
+        });
+    }
+    if words[1] < SPIRV_VERSION_1_0 {
+        return Err(VulkanShaderError::UnsupportedVersion {
+            name,
+            found: words[1],
+        });
+    }
+    if words[3] == 0 {
+        return Err(VulkanShaderError::InvalidBound { name });
+    }
+    Ok(())
+}