Implement step-wise animation locked to time series

main.c

@@ -10,6 +10,8 @@
 #define W 800
 #define H 600
 
+#define DT (1'000'000 / 60) // Assume 60 Hz for now
+
 static void
 key_callback(GLFWwindow *window, int key, int scancode, int action, int mods)
 {
@@ -79,7 +81,7 @@ int main(int argc, char *argv[])
 		glfwPollEvents();
 
 		mvp.model = mat4_mul(rot, mvp.model);
-		animation_update(&anim, &model);
+		animation_update(&anim, &model, DT);
 		gpu_render(&gpu, &mvp, anim.bone_matrices);
 	}