Added pause of opengl renderer while rendering picture

src/interface/modeler/quickapp/RenderProcess.cpp

@@ -8,6 +8,7 @@
 #include "Thread.h"
 #include "Canvas.h"
 #include "CanvasPreview.h"
+#include "OpenGLRenderer.h"
 
 class RenderThread: public Thread
 {
@@ -89,6 +90,9 @@ void RenderProcess::startRender(Scenery *scenery, const RenderConfig &config)
         image->setProperty("height", preview_size.height());
     }
 
+    // Pause OpenGL renderer
+    window->getRenderer()->pause();
+
     // Start render thread
     render_thread = new RenderThread(renderer);
     render_thread->start();
@@ -145,6 +149,8 @@ void RenderProcess::timerEvent(QTimerEvent *)
         render_thread->join();
         delete render_thread;
         render_thread = NULL;
+
+        window->getRenderer()->resume();
     }
 
     if (renderer)

src/render/opengl/ExplorerChunkTerrain.cpp

@@ -295,6 +295,11 @@ void ExplorerChunkTerrain::askInterrupt()
     interrupt = true;
 }
 
+void ExplorerChunkTerrain::askResume()
+{
+    interrupt = false;
+}
+
 Color ExplorerChunkTerrain::getTextureColor(double x, double y)
 {
     Vector3 location = {_startx + x * _size, 0.0, _startz + y * _size};

src/render/opengl/ExplorerChunkTerrain.h

@@ -29,6 +29,7 @@ public:
 
     void askReset(bool topology = true, bool texture = true);
     void askInterrupt();
+    void askResume();
 
     Color getTextureColor(double x, double y);
 

src/render/opengl/OpenGLRenderer.cpp

@@ -16,6 +16,7 @@ OpenGLRenderer::OpenGLRenderer(Scenery* scenery):
     SoftwareRenderer(scenery)
 {
     ready = false;
+    paused = false;
     vp_width = 1;
     vp_height = 1;
 
@@ -129,7 +130,7 @@ void OpenGLRenderer::resize(int width, int height)
 
 void OpenGLRenderer::paint()
 {
-    if (ready)
+    if (ready and not paused)
     {
         functions->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
@@ -145,6 +146,18 @@ void OpenGLRenderer::paint()
     }
 }
 
+void OpenGLRenderer::pause()
+{
+    paused = true;
+    terrain->pause();
+}
+
+void OpenGLRenderer::resume()
+{
+    paused = false;
+    terrain->resume();
+}
+
 void OpenGLRenderer::cameraChangeEvent(CameraDefinition *camera)
 {
     // Get camera info

src/render/opengl/OpenGLRenderer.h

@@ -26,6 +26,17 @@ public:
     void resize(int width, int height);
     void paint();
 
+    /**
+     * Pause the rendering process.
+     *
+     * This will prevent paintings and stop background tasks, until resume() is called.
+     */
+    void pause();
+    /**
+     * Resume the rendering process, put on hold by pause().
+     */
+    void resume();
+
     /**
      * Change the camera location.
      *
@@ -42,6 +53,7 @@ public:
 
 private:
     bool ready;
+    bool paused;
     int vp_width;
     int vp_height;
 

src/render/opengl/OpenGLTerrain.cpp

@@ -24,7 +24,11 @@ public:
     {
         while (running)
         {
-            terrain->performChunksMaintenance();
+            if (not terrain->isPaused())
+            {
+                terrain->performChunksMaintenance();
+            }
+
             Thread::timeSleepMs(10);
         }
     }
@@ -37,6 +41,7 @@ OpenGLTerrain::OpenGLTerrain(OpenGLRenderer *renderer):
     OpenGLPart(renderer)
 {
     work = new ChunkMaintenanceThreads(this);
+    paused = false;
 }
 
 OpenGLTerrain::~OpenGLTerrain()
@@ -105,6 +110,21 @@ void OpenGLTerrain::interrupt()
     }
 }
 
+void OpenGLTerrain::pause()
+{
+    paused = true;
+    interrupt();
+}
+
+void OpenGLTerrain::resume()
+{
+    for (auto &chunk: _chunks)
+    {
+        chunk->askResume();
+    }
+    paused = false;
+}
+
 void OpenGLTerrain::resetTextures()
 {
     for (auto &chunk: _chunks)

src/render/opengl/OpenGLTerrain.h

@@ -24,6 +24,10 @@ public:
     virtual void render() override;
     virtual void interrupt() override;
 
+    void pause();
+    void resume();
+    inline bool isPaused() const { return paused; }
+
     /**
      * Reset the color textures, without changing the tessellation.
      */
@@ -36,6 +40,7 @@ private:
     OpenGLShaderProgram* program;
 
     ParallelPool* work;
+    bool paused;
 
     QVector<ExplorerChunkTerrain*> _chunks;
     QList<ExplorerChunkTerrain*> _updateQueue;