adding real runtime

example/main.zig

@@ -13,10 +13,13 @@ pub fn main() !void {
         var module = try spv.Module.init(allocator, @ptrCast(@alignCast(shader_source)));
         defer module.deinit(allocator);
 
-        var rt = spv.Runtime.init(&module);
-        defer rt.deinit();
+        var rt = try spv.Runtime.init(allocator, &module);
+        defer rt.deinit(allocator);
 
-        try rt.callEntryPoint(0);
+        try rt.callEntryPoint(allocator, try rt.getEntryPointByName("main"));
+        var output: [4]f32 = undefined;
+        try rt.readOutput(f32, output[0..output.len], try rt.getResultByName("color"));
+        std.log.info("Result: Vec4[{d}, {d}, {d}, {d}]", .{ output[0], output[1], output[2], output[3] });
     }
     std.log.info("Successfully executed", .{});
 }