[video_core] Properly disable/avoid building OpenGL when it's disabled (#3692)

- OpenGL symbols would still be included in builds without OpenGL, this pr fixes that
- Same goes for Vulkan, but now with `ENABLE_VULKAN`
- Add support to have OpenGL-only builds (why would you do this?)
- Add support for headless runs (yes you could just select NULL backend, but why not compile it headless? :)

Signed-off-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3692
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: DraVee <chimera@dravee.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

1 files changed, 19 insertions, 3 deletions

diff --git a/src/yuzu/main_window.cpp b/src/yuzu/main_window.cpp
index a251451bea..029826dfa3 100644
--- a/src/yuzu/main_window.cpp
+++ b/src/yuzu/main_window.cpp
@@ -3784,14 +3784,30 @@ void MainWindow::OnToggleAdaptingFilter() {
 
 void MainWindow::OnToggleGraphicsAPI() {
     auto api = Settings::values.renderer_backend.GetValue();
-    if (api != Settings::RendererBackend::Vulkan) {
-        api = Settings::RendererBackend::Vulkan;
-    } else {
+    switch (api) {
 #ifdef HAS_OPENGL
+    case Settings::RendererBackend::Vulkan:
+        api = Settings::RendererBackend::OpenGL_GLSL;
+        break;
+    case Settings::RendererBackend::OpenGL_GLSL:
         api = Settings::RendererBackend::OpenGL_GLSL;
+        break;
+    case Settings::RendererBackend::OpenGL_SPIRV:
+        api = Settings::RendererBackend::OpenGL_GLASM;
+        break;
+    case Settings::RendererBackend::OpenGL_GLASM:
+        api = Settings::RendererBackend::Null;
+        break;
 #else
+    case Settings::RendererBackend::Vulkan:
         api = Settings::RendererBackend::Null;
+        break;
 #endif
+    case Settings::RendererBackend::Null:
+        api = Settings::RendererBackend::Vulkan;
+        break;
+    default:
+        break;
     }
     Settings::values.renderer_backend.SetValue(api);
     renderer_status_button->setChecked(api == Settings::RendererBackend::Vulkan);