1 files changed, 62 insertions, 0 deletions
diff --git a/codegen/command/functions.rs b/codegen/command/functions.rs
new file mode 100644
index 0000000..6d1a3d3
--- /dev/null
+++ b/codegen/command/functions.rs
@@ -0,0 +1,62 @@
+use std::error::Error;
+use std::str::FromStr;
+
+use opengl_registry::command::Command;
+use proc_macro2::{LexError, TokenStream};
+use quote::{format_ident, quote};
+
+use crate::codegen::formatting::{clean_param_name, fix_type};
+
+pub fn create_command_functions(
+    commands: &[Command],
+) -> Result<Vec<TokenStream>, Box<dyn Error>>
+{
+    commands.iter().map(|command| {
+        let command_name_str = command.prototype().name();
+
+        let command_name = format_ident!("{}", command.prototype().name());
+
+        let command_name_prefixless = format_ident!("{}", command.prototype()
+            .name()
+            .strip_prefix("gl")
+            .unwrap_or_else(|| command.prototype().name()));
+
+        let command_args = command
+            .parameters()
+            .iter()
+            .map(|param| {
+                let param_name = format_ident!("{}", clean_param_name(param.name()));
+
+                let param_type = TokenStream::from_str(&fix_type(param.get_type()))?;
+
+                Ok::<_, LexError>(quote! { #param_name: #param_type })
+            }).collect::<Result<Vec<_>, _>>()?;
+
+        let command_return_type = TokenStream::from_str(&fix_type(command.prototype().return_type()))?;
+
+        let command_arg_types = command
+            .parameters()
+            .iter()
+            .map(|param| TokenStream::from_str(&fix_type(param.get_type())))
+            .collect::<Result<Vec<_>, _>>()?;
+
+        let command_arg_names = command
+            .parameters()
+            .iter()
+            .map(|param| format_ident!("{}", clean_param_name(param.name())))
+            .collect::<Vec<_>>();
+
+        Ok(quote! {
+            #[doc = #command_name_str]
+            #[allow(non_snake_case, clippy::too_many_arguments)]
+            pub unsafe fn #command_name_prefixless(#(#command_args),*) -> #command_return_type {
+                type GLFunc =
+                    unsafe extern "C" fn(#(#command_arg_types),*) -> #command_return_type;
+
+                let gl_func = std::mem::transmute::<_, GLFunc>(functions::#command_name);
+
+                gl_func(#(#command_arg_names),*)
+            }
+        })
+    }).collect()
+}