WIP waveform drawing

src/custom_sfml_audio/open_music.hpp

@@ -21,6 +21,8 @@ public:
     sf::Time getDuration() const;
     TimeSpan getLoopPoints() const;
     void setLoopPoints(TimeSpan timePoints);
+    sf::Uint64 timeToSamples(sf::Time position) const;
+    sf::Time samplesToTime(sf::Uint64 samples) const;
 
 protected:
     [[nodiscard]] bool onGetData(Chunk& data) override;
@@ -29,8 +31,6 @@ protected:
 
 private:
     void initialize();
-    sf::Uint64 timeToSamples(sf::Time position) const;
-    sf::Time samplesToTime(sf::Uint64 samples) const;
 
     sf::InputSoundFile m_file;     //!< The streamed music file
     std::vector<sf::Int16> m_samples;  //!< Temporary buffer of samples

src/widgets/meson.build

@@ -2,5 +2,6 @@ sources += files([
     'blank_screen.cpp',
     'density_graph.cpp',
     'lane_order.cpp',
-    'linear_view.cpp'
+    'linear_view.cpp',
+    'waveform_view.cpp',
 ])

src/widgets/waveform_view.cpp

@@ -0,0 +1,43 @@
+#include "waveform_view.hpp"
+
+#include <SFML/System/Vector2.hpp>
+
+#include <imgui.h>
+#include <imgui_extras.hpp>
+#include <imgui_internal.h>
+
+WaveformView::WaveformView(const std::shared_ptr<OpenMusic>& audio_):
+    audio(audio_)
+{
+
+}
+
+void WaveformView::draw(const sf::Time current_time) {
+    if (ImGui::Begin("Waveform view")) {
+        if (not data_is_ready) {
+            feis::CenteredText("Loading ...");
+            return ImGui::End();
+        }
+
+        const auto window = ImGui::GetCurrentWindow();
+        const auto work_rect = window->WorkRect;
+        auto draw_list = window->DrawList;
+        const float cursor_y = 50.f;
+        const float waveform_center_x = work_rect.GetCenter().x;
+        if (max_of_every_64_samples.size() <= 1) {
+            feis::CenteredText("Not enough samples ... Why ?");
+            return ImGui::End();
+        }
+
+        const std::int64_t sample_at_cursor = audio->timeToSamples(current_time);
+        const auto bucket_at_cursor = sample_at_cursor / 64;
+        const auto first_bucket = bucket_at_cursor - static_cast<std::int64_t>(cursor_y);
+        const auto end_bucket = first_bucket + static_cast<std::int64_t>(work_rect.GetHeight());
+        auto it = max_of_every_64_samples.begin();
+        auto next_it = std::next(it);
+        for (; next_it != max_of_every_64_samples.end(); ++next_it, ++it) {
+            
+        }
+    }
+    ImGui::End();
+}

src/widgets/waveform_view.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <memory>
+#include <thread>
+
+#include <imgui/imgui.h>
+#include <SFML/System/Time.hpp>
+
+#include "../custom_sfml_audio/open_music.hpp"
+
+class WaveformView {
+public:
+    explicit WaveformView(const std::shared_ptr<OpenMusic>& audio);
+    void draw(const sf::Time current_time);
+private:
+    std::shared_ptr<OpenMusic> audio;
+    std::atomic<bool> data_is_ready;
+    std::vector<float> max_of_every_64_samples;
+
+    void prepare_data();
+};