From 059771199390113c5c1cf385ef586f7dd6320b3c Mon Sep 17 00:00:00 2001
From: Be <be@mixxx.org>
Date: Mon, 7 Dec 2020 01:37:57 -0600
Subject: hack around QGLWidget::initializeGL not working on macOS

---
 src/waveform/renderers/glslwaveformrenderersignal.cpp     |  6 ++----
 src/waveform/renderers/glvsynctestrenderer.cpp            |  1 +
 .../renderers/glwaveformrendererfilteredsignal.cpp        |  1 +
 src/waveform/renderers/glwaveformrendererrgb.cpp          |  2 ++
 src/waveform/renderers/glwaveformrenderersimplesignal.cpp |  2 ++
 src/waveform/renderers/waveformrendererabstract.h         | 15 +++++++++++++++
 6 files changed, 23 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/waveform/renderers/glslwaveformrenderersignal.cpp b/src/waveform/renderers/glslwaveformrenderersignal.cpp
index bdab25207a..10e0ed82c1 100644
--- a/src/waveform/renderers/glslwaveformrenderersignal.cpp
+++ b/src/waveform/renderers/glslwaveformrenderersignal.cpp
@@ -254,10 +254,6 @@ void GLSLWaveformRendererSignal::slotWaveformUpdated() {
 }
 
 void GLSLWaveformRendererSignal::draw(QPainter* painter, QPaintEvent* /*event*/) {
-    if (!m_framebuffer || !m_framebuffer->isValid() || !m_shadersValid) {
-        return;
-    }
-
     TrackPointer trackInfo = m_waveformRenderer->getTrackInfo();
     if (!trackInfo) {
         return;
@@ -278,6 +274,8 @@ void GLSLWaveformRendererSignal::draw(QPainter* painter, QPaintEvent* /*event*/)
         return;
     }
 
+    maybeInitializeGL();
+
     // save the GL state set for QPainter
     painter->beginNativePainting();
 
diff --git a/src/waveform/renderers/glvsynctestrenderer.cpp b/src/waveform/renderers/glvsynctestrenderer.cpp
index cad6a2205d..6cbc85b454 100644
--- a/src/waveform/renderers/glvsynctestrenderer.cpp
+++ b/src/waveform/renderers/glvsynctestrenderer.cpp
@@ -26,6 +26,7 @@ inline void setPoint(QPointF& point, qreal x, qreal y) {
 }
 
 void GLVSyncTestRenderer::draw(QPainter* painter, QPaintEvent* /*event*/) {
+    maybeInitializeGL();
 
     PerformanceTimer timer;
     //mixxx::Duration t5, t6, t7, t8, t9, t10, t11, t12, t13;
diff --git a/src/waveform/renderers/glwaveformrendererfilteredsignal.cpp b/src/waveform/renderers/glwaveformrendererfilteredsignal.cpp
index 9043ee5262..0ad618c0bd 100644
--- a/src/waveform/renderers/glwaveformrendererfilteredsignal.cpp
+++ b/src/waveform/renderers/glwaveformrendererfilteredsignal.cpp
@@ -23,6 +23,7 @@ void GLWaveformRendererFilteredSignal::onSetup(const QDomNode& /*node*/) {
 }
 
 void GLWaveformRendererFilteredSignal::draw(QPainter* painter, QPaintEvent* /*event*/) {
+    maybeInitializeGL();
 
     TrackPointer pTrack = m_waveformRenderer->getTrackInfo();
     if (!pTrack) {
diff --git a/src/waveform/renderers/glwaveformrendererrgb.cpp b/src/waveform/renderers/glwaveformrendererrgb.cpp
index 50ac786781..708a139a43 100644
--- a/src/waveform/renderers/glwaveformrendererrgb.cpp
+++ b/src/waveform/renderers/glwaveformrendererrgb.cpp
@@ -25,6 +25,8 @@ void GLWaveformRendererRGB::onSetup(const QDomNode& /* node */) {
 }
 
 void GLWaveformRendererRGB::draw(QPainter* painter, QPaintEvent* /*event*/) {
+    maybeInitializeGL();
+
     TrackPointer pTrack = m_waveformRenderer->getTrackInfo();
     if (!pTrack) {
         return;
diff --git a/src/waveform/renderers/glwaveformrenderersimplesignal.cpp b/src/waveform/renderers/glwaveformrenderersimplesignal.cpp
index 56d9f5448e..041353ff7c 100644
--- a/src/waveform/renderers/glwaveformrenderersimplesignal.cpp
+++ b/src/waveform/renderers/glwaveformrenderersimplesignal.cpp
@@ -25,6 +25,8 @@ inline void setPoint(QPointF& point, qreal x, qreal y) {
 }
 
 void GLWaveformRendererSimpleSignal::draw(QPainter* painter, QPaintEvent* /*event*/) {
+    maybeInitializeGL();
+
     TrackPointer pTrack = m_waveformRenderer->getTrackInfo();
     if (!pTrack) {
         return;
diff --git a/src/waveform/renderers/waveformrendererabstract.h b/src/waveform/renderers/waveformrendererabstract.h
index 6a1bba6f6d..9b7bcd692e 100644
--- a/src/waveform/renderers/waveformrendererabstract.h
+++ b/src/waveform/renderers/waveformrendererabstract.h
@@ -2,6 +2,7 @@
 #define WAVEFORMRENDERERABSTRACT_H
 
 #include <QDomNode>
+#include <QGLContext>
 #include <QOpenGLFunctions_2_1>
 #include <QPaintEvent>
 #include <QPainter>
@@ -58,6 +59,20 @@ class GLWaveformRenderer : protected QOpenGLFunctions_2_1 {
     virtual void onInitializeGL() {
         initializeOpenGLFunctions();
     }
+
+  protected:
+    // Somehow QGLWidget does not call QGLWidget::initializeGL on macOS, so hack around that
+    // by calling this in `draw` when the QGLContext has been made current.
+    // TODO: remove this when upgrading to QOpenGLWidget
+    void maybeInitializeGL() {
+        if (QGLContext::currentContext() != m_pLastContext) {
+            onInitializeGL();
+            m_pLastContext = QGLContext::currentContext();
+        }
+    }
+
+  private:
+    const QGLContext* m_pLastContext;
 };
 
 #endif // WAVEFORMRENDERERABSTRACT_H
-- 
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