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@ -16,11 +16,37 @@
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namespace Service::Nvnflinger {
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namespace {
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s32 NormalizeSwapInterval(f32* out_speed_scale, s32 swap_interval) {
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if (swap_interval <= 0) {
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// As an extension, treat nonpositive swap interval as speed multiplier.
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if (out_speed_scale) {
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*out_speed_scale = 2.f * static_cast<f32>(1 - swap_interval);
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}
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swap_interval = 1;
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}
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if (swap_interval >= 5) {
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// As an extension, treat high swap interval as precise speed control.
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if (out_speed_scale) {
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*out_speed_scale = static_cast<f32>(swap_interval) / 100.f;
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}
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swap_interval = 1;
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}
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return swap_interval;
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}
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} // namespace
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HardwareComposer::HardwareComposer() = default;
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HardwareComposer::~HardwareComposer() = default;
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u32 HardwareComposer::ComposeLocked(VI::Display& display, Nvidia::Devices::nvdisp_disp0& nvdisp,
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u32 frame_advance) {
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u32 HardwareComposer::ComposeLocked(f32* out_speed_scale, VI::Display& display,
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Nvidia::Devices::nvdisp_disp0& nvdisp, u32 frame_advance) {
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boost::container::small_vector<HwcLayer, 2> composition_stack;
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m_frame_number += frame_advance;
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@ -45,8 +71,11 @@ u32 HardwareComposer::ComposeLocked(VI::Display& display, Nvidia::Devices::nvdis
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}
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}
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// Set default speed limit to 100%.
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*out_speed_scale = 1.0f;
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// Determine the number of vsync periods to wait before composing again.
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std::optional<u32> swap_interval{};
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std::optional<s32> swap_interval{};
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bool has_acquired_buffer{};
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// Acquire all necessary framebuffers.
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@ -87,14 +116,15 @@ u32 HardwareComposer::ComposeLocked(VI::Display& display, Nvidia::Devices::nvdis
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// We need to compose again either before this frame is supposed to
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// be released, or exactly on the vsync period it should be released.
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//
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const s32 item_swap_interval = NormalizeSwapInterval(out_speed_scale, item.swap_interval);
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// TODO: handle cases where swap intervals are relatively prime. So far,
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// only swap intervals of 0, 1 and 2 have been observed, but if 3 were
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// to be introduced, this would cause an issue.
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if (swap_interval) {
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swap_interval = std::min(*swap_interval, item.swap_interval);
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swap_interval = std::min(*swap_interval, item_swap_interval);
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} else {
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swap_interval = item.swap_interval;
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swap_interval = item_swap_interval;
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}
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}
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@ -111,13 +141,8 @@ u32 HardwareComposer::ComposeLocked(VI::Display& display, Nvidia::Devices::nvdis
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// Render MicroProfile.
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MicroProfileFlip();
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// If we advanced, then advance by at least 1 frame.
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if (swap_interval) {
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return std::max(*swap_interval, 1U);
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}
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// Otherwise, advance by exactly one frame.
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return 1U;
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// Advance by at least one frame.
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return swap_interval.value_or(1);
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}
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void HardwareComposer::RemoveLayerLocked(VI::Display& display, LayerId layer_id) {
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@ -146,7 +171,7 @@ bool HardwareComposer::TryAcquireFramebufferLocked(VI::Layer& layer, Framebuffer
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// We succeeded, so set the new release frame info.
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framebuffer.release_frame_number =
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m_frame_number + std::max(1U, framebuffer.item.swap_interval);
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NormalizeSwapInterval(nullptr, framebuffer.item.swap_interval);
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framebuffer.is_acquired = true;
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return true;
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