Add an extra test case

test/cmake/Video.cmake

@@ -31,3 +31,10 @@ add_python_test(
     CORE_OPTION "melonds_render_mode=opengl"
     REQUIRES_OPENGL
 )
+
+add_python_test(
+    NAME "Core can switch from software to OpenGL mode at runtime"
+    TEST_MODULE opengl.core_switch_software_to_opengl_runtime
+    CONTENT "${NDS_ROM}"
+    REQUIRES_OPENGL
+)

test/python/opengl/core_switch_software_to_opengl_runtime.py

@@ -0,0 +1,26 @@
+from ctypes import CFUNCTYPE, c_bool
+
+import prelude
+
+options = {
+    b"melonds_render_mode": b"software",
+}
+
+with prelude.builder().with_options(options).build() as session:
+    is_opengl_renderer = session.get_proc_address(b"melondsds_is_opengl_renderer", CFUNCTYPE(c_bool))
+    assert is_opengl_renderer is not None, "melondsds_is_opengl_renderer not defined in the core"
+
+    is_software_renderer = session.get_proc_address(b"melondsds_is_software_renderer", CFUNCTYPE(c_bool))
+    assert is_software_renderer is not None, "melondsds_is_software_renderer not defined in the core"
+
+    assert is_software_renderer()
+
+    for i in range(3):
+        session.run()
+
+    session.options.variables["melonds_render_mode"] = b"opengl"
+
+    for i in range(3):
+        session.run()
+
+    assert is_opengl_renderer()