Apply startup GL state through renderer GL

src/renderer_gl/opengl_capabilities.cpp

@@ -224,6 +224,27 @@ OpenGlInitialState panopainter_initial_state() noexcept
     };
 }
 
+pp::foundation::Status apply_panopainter_initial_state(OpenGlStateDispatch dispatch) noexcept
+{
+    if (dispatch.enable == nullptr
+        || dispatch.disable == nullptr
+        || dispatch.blend_func == nullptr
+        || dispatch.blend_equation_separate == nullptr)
+    {
+        return pp::foundation::Status::invalid_argument("OpenGL state dispatch callbacks must not be null");
+    }
+
+    const auto state = panopainter_initial_state();
+    if (state.depth_test_enabled)
+        dispatch.enable(state.depth_test_state);
+    else
+        dispatch.disable(state.depth_test_state);
+
+    dispatch.blend_func(state.source_color_factor, state.destination_color_factor);
+    dispatch.blend_equation_separate(state.color_equation, state.alpha_equation);
+    return pp::foundation::Status::success();
+}
+
 std::uint32_t extension_count_query() noexcept
 {
     return gl_num_extensions;