fix window cross-compilation

src/renderer/OpenGL.zig

@@ -70,6 +70,16 @@ pub fn glfwWindowHints(config: *const configpkg.Config) glfw.Window.Hints {
     };
 }
 
+/// 32-bit windows cross-compilation breaks with `.c` for some reason, so...
+const gl_debug_proc_callconv =
+    @typeInfo(
+        @typeInfo(
+            @typeInfo(
+                gl.c.GLDEBUGPROC,
+            ).optional.child,
+        ).pointer.child,
+    ).@"fn".calling_convention;
+
 fn glDebugMessageCallback(
     src: gl.c.GLenum,
     typ: gl.c.GLenum,
@@ -78,7 +88,7 @@ fn glDebugMessageCallback(
     len: gl.c.GLsizei,
     msg: [*c]const gl.c.GLchar,
     user_param: ?*const anyopaque,
-) callconv(.c) void {
+) callconv(gl_debug_proc_callconv) void {
     _ = user_param;
 
     const src_str: []const u8 = switch (src) {

src/renderer/opengl/shaders.zig

@@ -295,7 +295,7 @@ fn processIncludes(contents: [:0]const u8, basedir: []const u8) [:0]const u8 {
                 "{s}{s}{s}",
                 .{
                     contents[0..i],
-                    @embedFile(basedir ++ .{std.fs.path.sep} ++ contents[start..end]),
+                    @embedFile(basedir ++ "/" ++ contents[start..end]),
                     processIncludes(contents[end + 1 ..], basedir),
                 },
             );