Route VR and startup GL state through backend

src/renderer_gl/opengl_capabilities.cpp

@@ -526,6 +526,18 @@ pp::foundation::Status apply_opengl_capability(
     return pp::foundation::Status::success();
 }
 
+pp::foundation::Result<bool> query_opengl_capability_state(
+    std::uint32_t state,
+    OpenGlCapabilityStateQueryDispatch dispatch) noexcept
+{
+    if (dispatch.is_enabled == nullptr) {
+        return pp::foundation::Result<bool>::failure(
+            pp::foundation::Status::invalid_argument("OpenGL capability state query callback must not be null"));
+    }
+
+    return pp::foundation::Result<bool>::success(dispatch.is_enabled(state) != 0U);
+}
+
 pp::foundation::Status apply_opengl_render_platform_hints(
     OpenGlRenderPlatformHintDispatch dispatch) noexcept
 {

src/renderer_gl/opengl_capabilities.h

@@ -530,6 +530,10 @@ struct OpenGlCapabilityDispatch {
     OpenGlCapabilityFn disable = nullptr;
 };
 
+struct OpenGlCapabilityStateQueryDispatch {
+    OpenGlIsEnabledFn is_enabled = nullptr;
+};
+
 struct OpenGlRenderPlatformHintDispatch {
     OpenGlCapabilityFn enable = nullptr;
 };
@@ -760,6 +764,9 @@ struct OpenGlMeshDeleteDispatch {
     std::uint32_t state,
     bool enabled,
     OpenGlCapabilityDispatch dispatch) noexcept;
+[[nodiscard]] pp::foundation::Result<bool> query_opengl_capability_state(
+    std::uint32_t state,
+    OpenGlCapabilityStateQueryDispatch dispatch) noexcept;
 [[nodiscard]] pp::foundation::Status apply_opengl_render_platform_hints(
     OpenGlRenderPlatformHintDispatch dispatch) noexcept;
 [[nodiscard]] pp::foundation::Status apply_opengl_debug_output_states(