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vii
46d1d5ffbe
A driver can reject a present mode the device did not enable. Retry once with the mode the game asked for, except after errors another mode cannot fix.
73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
#ifndef MOCKTAIL_GRAPHICS_PRESENT_MODE_POLICY_H_
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#define MOCKTAIL_GRAPHICS_PRESENT_MODE_POLICY_H_
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#include <cstdint>
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#include <cstdio>
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#include <string_view>
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#include <vector>
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#include <vulkan/vulkan.h>
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namespace mocktail {
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namespace graphics {
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enum class PresentModePolicy {
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kHostDefault,
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kVsync,
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kUnthrottled,
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};
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PresentModePolicy ResolvePresentModePolicy(std::string_view vsync_value,
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std::string_view frame_rate_value);
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// Reads MOCKTAIL_VSYNC / MOCKTAIL_FRAME_RATE_LIMIT once. Window pacing and
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// the Vulkan adapter must use this instead of getenv'ing the same keys.
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PresentModePolicy CachedPresentModePolicy();
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std::vector<VkPresentModeKHR>
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FilterPresentModes(PresentModePolicy policy,
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const std::vector<VkPresentModeKHR> &host_modes);
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const char *PresentModePolicyName(PresentModePolicy policy);
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const char *PresentModeKhrName(VkPresentModeKHR mode);
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// Creates the swapchain with the mode in `info`. A driver can reject a mode
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// that the device did not enable, so a failed create is retried once with the
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// mode the game asked for. `create` takes the info and returns a VkResult.
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template <typename Create>
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VkResult CreateSwapchainWithPresentModeFallback(VkSwapchainCreateInfoKHR &info,
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VkPresentModeKHR requested,
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Create create) {
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const VkResult result = create(info);
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if (result == VK_SUCCESS || info.presentMode == requested) {
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return result;
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}
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switch (result) {
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case VK_ERROR_OUT_OF_HOST_MEMORY:
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case VK_ERROR_OUT_OF_DEVICE_MEMORY:
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case VK_ERROR_DEVICE_LOST:
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case VK_ERROR_SURFACE_LOST_KHR:
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case VK_ERROR_NATIVE_WINDOW_IN_USE_KHR:
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return result; // Another present mode cannot fix these.
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default:
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break;
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}
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std::fprintf(stderr,
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" [vulkan] swapchain presentMode %s failed (%d); retrying "
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"with %s\n",
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PresentModeKhrName(info.presentMode), static_cast<int>(result),
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PresentModeKhrName(requested));
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info.presentMode = requested;
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return create(info);
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}
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// Extra images so acquire does not wait on the compositor-held buffer.
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std::uint32_t PreferSwapchainMinImageCount(PresentModePolicy policy,
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std::uint32_t requested,
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std::uint32_t min_images,
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std::uint32_t max_images);
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} // namespace graphics
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} // namespace mocktail
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#endif // MOCKTAIL_GRAPHICS_PRESENT_MODE_POLICY_H_
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