47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
#include <llmr/renderer/frame_history.hpp>
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using namespace llmr;
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// Record frame history that will be used to calculate fading params
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void FrameHistory::record(float zoom) {
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// first frame ever
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if (!history.size()) {
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history.emplace_back(FrameSnapshot{0.0f, zoom});
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history.emplace_back(FrameSnapshot{0.0f, zoom});
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}
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if (history.size() == 2 || history.back().z != zoom) {
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history.emplace_back(FrameSnapshot{static_cast<float>(platform::time() * 1000), zoom});
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}
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}
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bool FrameHistory::needsAnimation(const float duration) const {
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if (!history.size()) return true;
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// If we have a value that is older than duration and whose z value is the
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// same as the most current z value, and if all values inbetween have the
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// same z value, we don't need animation, otherwise we probably do.
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const FrameSnapshot &pivot = history.back();
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int i = -1;
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while (history.size() > i + 1 &&
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history[i + 1].time + duration < pivot.time) {
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i++;
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}
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if (i < 0) {
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// There is no frame that is older than the duration time, so we need to
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// check all frames.
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i = 0;
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}
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// Make sure that all subsequent snapshots have the same zoom as the last
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// pivot element.
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for (; history.size() > i; i++) {
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if (history[i].z != pivot.z) {
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return true;
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}
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}
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return false;
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} |