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main: allow overriding the backend with the value of a ConVar #2147

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Merged
misyltoad merged 1 commit into from
May 11, 2026
Merged

main: allow overriding the backend with the value of a ConVar #2147

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2 changes: 2 additions & 0 deletions src/backend.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,8 @@ extern bool g_bAllowDeferredBackend;

namespace gamescope
{
ConVar<std::string> cv_backend( "backend", "auto", "Override the backend selection (auto-detected or specified on the command line)." );

ConVar<VirtualConnectorStrategy> cv_backend_virtual_connector_strategy( "backend_virtual_connector_strategy", VirtualConnectorStrategies::SingleApplication );

/////////////
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3 changes: 2 additions & 1 deletion src/backend.h
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Expand Up @@ -31,6 +31,8 @@ namespace gamescope
class BackendBlob;
class INestedHints;

extern ConVar<std::string> cv_backend;

namespace VirtualConnectorStrategies
{
enum VirtualConnectorStrategy : uint32_t
Expand Down Expand Up @@ -504,4 +506,3 @@ inline gamescope::IBackend *GetBackend()
{
return gamescope::IBackend::Get();
}

8 changes: 8 additions & 0 deletions src/main.cpp
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Expand Up @@ -908,6 +908,14 @@ int main(int argc, char **argv)
g_pOriginalDisplay = getenv("DISPLAY");
g_pOriginalWaylandDisplay = getenv("WAYLAND_DISPLAY");

// Allow overriding the selected backend (even the backend
// requested on the command line) in a startup script.
auto backendOverride = parse_backend_name( gamescope::cv_backend.Get().c_str() );
if ( backendOverride != gamescope::GamescopeBackend::Auto )
{
eCurrentBackend = backendOverride;
}

if ( eCurrentBackend == gamescope::GamescopeBackend::Auto )
{
if ( g_pOriginalWaylandDisplay != NULL )
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