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Try to just recreate the surface and swap chain when being restored on Android

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A full device lost + restore takes about 300ms on my Google Pixel Fold running Android 17, where just recreating the swap chain only takes about 8 ms.
This commit is contained in:
Sam Lantinga
2026-09-11 14:14:41 -07:00
parent 0cb26f9f6d
commit ea3963f01a
1 changed files with 49 additions and 1 deletions
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50
src/render/vulkan/SDL_render_vulkan.c
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@@ -2767,6 +2767,50 @@ static VkResult VULKAN_UpdateForWindowSizeChange(SDL_Renderer *renderer)
return VULKAN_CreateWindowSizeDependentResources(renderer);
}
#ifdef SDL_PLATFORM_ANDROID
static bool VULKAN_HandleWindowRestored(SDL_Renderer *renderer)
{
VULKAN_RenderData *rendererData = (VULKAN_RenderData *)renderer->internal;
if (!rendererData->device) {
return false;
}
if (rendererData->surface_external) {
// We can't recreate external surfaces, fall back to device lost handling
return false;
}
VULKAN_IssueBatch(rendererData);
VULKAN_WaitForGPU(rendererData);
if (rendererData->swapchain != VK_NULL_HANDLE) {
vkDestroySwapchainKHR(rendererData->device, rendererData->swapchain, NULL);
rendererData->swapchain = VK_NULL_HANDLE;
}
if (rendererData->surface != VK_NULL_HANDLE) {
vkDestroySurfaceKHR(rendererData->instance, rendererData->surface, NULL);
rendererData->surface = VK_NULL_HANDLE;
}
if (!SDL_Vulkan_CreateSurface(renderer->window, rendererData->instance, NULL, &rendererData->surface)) {
return false;
}
// The formats we cached were queried against the old surface
VkResult result = VULKAN_GetSurfaceFormats(rendererData);
if (result != VK_SUCCESS) {
return false;
}
result = VULKAN_CreateWindowSizeDependentResources(renderer);
if (result != VK_SUCCESS) {
return false;
}
return true;
}
#endif // SDL_PLATFORM_ANDROID
static void VULKAN_WindowEvent(SDL_Renderer *renderer, const SDL_WindowEvent *event)
{
VULKAN_RenderData *rendererData = (VULKAN_RenderData *)renderer->internal;
@@ -2778,7 +2822,11 @@ static void VULKAN_WindowEvent(SDL_Renderer *renderer, const SDL_WindowEvent *ev
#ifdef SDL_PLATFORM_ANDROID
// Prevent black screen when app returns from background
if (event->type == SDL_EVENT_WINDOW_RESTORED) {
VULKAN_HandleDeviceLost(renderer);
// Try to just recreate the surface and swap chain
if (!VULKAN_HandleWindowRestored(renderer)) {
// We're fully lost, notify the application
VULKAN_HandleDeviceLost(renderer);
}
}
#endif
}