libretro: fix linker error with tests

src/citra_libretro/citra_libretro.cpp

@@ -105,31 +105,6 @@ unsigned retro_api_version() {
     return RETRO_API_VERSION;
 }
 
-void LibRetro::OnConfigureEnvironment() {
-
-#ifdef HAVE_LIBRETRO_VFS
-    struct retro_vfs_interface_info vfs_iface_info{1, nullptr};
-    LibRetro::SetVFSCallback(&vfs_iface_info);
-#endif
-
-    LibRetro::RegisterCoreOptions();
-
-    static const struct retro_controller_description controllers[] = {
-        {"Nintendo 3DS", RETRO_DEVICE_JOYPAD},
-    };
-
-    static const struct retro_controller_info ports[] = {
-        {controllers, 1},
-        {nullptr, 0},
-    };
-
-    LibRetro::SetControllerInfo(ports);
-}
-
-uintptr_t LibRetro::GetFramebuffer() {
-    return emu_instance->hw_render.get_current_framebuffer();
-}
-
 /**
  * Updates Citra's settings with Libretro's.
  */
@@ -598,6 +573,7 @@ bool retro_load_game(const struct retro_game_info* info) {
             LibRetro::DisplayMessage("Failed to set HW renderer");
             return false;
         }
+        LibRetro::SetFramebufferCallback(emu_instance->hw_render.get_current_framebuffer);
 #endif
         break;
     case Settings::GraphicsAPI::Vulkan:

src/citra_libretro/environment.cpp

@@ -8,6 +8,7 @@
 #include "audio_core/libretro_sink.h"
 #include "common/scm_rev.h"
 #include "core/3ds.h"
+#include "core_settings.h"
 #include "emu_window/libretro_window.h"
 #include "environment.h"
 
@@ -26,6 +27,7 @@ static retro_audio_sample_batch_t audio_batch_cb;
 static retro_environment_t environ_cb;
 static retro_input_poll_t input_poll_cb;
 static retro_input_state_t input_state_cb;
+static retro_hw_get_current_framebuffer_t framebuffer_cb;
 
 } // namespace
 
@@ -232,6 +234,34 @@ bool CanUseJIT() {
 }
 #endif
 
+void OnConfigureEnvironment() {
+#ifdef HAVE_LIBRETRO_VFS
+    struct retro_vfs_interface_info vfs_iface_info{1, nullptr};
+    SetVFSCallback(&vfs_iface_info);
+#endif
+
+    RegisterCoreOptions();
+
+    static const struct retro_controller_description controllers[] = {
+        {"Nintendo 3DS", RETRO_DEVICE_JOYPAD},
+    };
+
+    static const struct retro_controller_info ports[] = {
+        {controllers, 1},
+        {nullptr, 0},
+    };
+
+    SetControllerInfo(ports);
+}
+
+void SetFramebufferCallback(retro_hw_get_current_framebuffer_t cb) {
+    framebuffer_cb = cb;
+}
+
+uintptr_t GetFramebuffer() {
+    return framebuffer_cb ? framebuffer_cb() : 0;
+}
+
 }; // namespace LibRetro
 
 void retro_get_system_info(struct retro_system_info* info) {

src/citra_libretro/environment.h

@@ -109,6 +109,9 @@ bool HasUpdatedConfig();
 /// Returns the current framebuffer.
 uintptr_t GetFramebuffer();
 
+/// Sets the callback used by GetFramebuffer().
+void SetFramebufferCallback(retro_hw_get_current_framebuffer_t cb);
+
 /// Tells the frontend that we are done.
 bool Shutdown();