plug export into render thread

ui/renderthread.cpp

@@ -125,12 +125,19 @@ void RenderThread::paint() {
 		}
 	}
 
+	if (pixel_buffer != nullptr) {
+		ctx->functions()->glBindFramebuffer(GL_READ_FRAMEBUFFER, frameBuffer);
+		glReadPixels(0, 0, tex_width, tex_height, GL_RGBA, GL_UNSIGNED_BYTE, pixel_buffer);
+		ctx->functions()->glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+		pixel_buffer = nullptr;
+	}
+
 	glDisable(GL_DEPTH);
 	glDisable(GL_BLEND);
 	glDisable(GL_TEXTURE_2D);
 }
 
-void RenderThread::start_render(QOpenGLContext *share, Sequence *s, const QString& save, int idivider) {
+void RenderThread::start_render(QOpenGLContext *share, Sequence *s, const QString& save, GLvoid* pixels, int idivider) {
 	seq = s;
 
 	// stall any dependent actions
@@ -147,6 +154,8 @@ void RenderThread::start_render(QOpenGLContext *share, Sequence *s, const QStrin
 	}
 
 	save_fn = save;
+	pixel_buffer = pixels;
+
 	queued = true;
 	waitCond.wakeAll();
 }

ui/renderthread.h

@@ -20,7 +20,7 @@ public:
 	GLuint frameBuffer;
 	GLuint texColorBuffer;
 	void paint();
-	void start_render(QOpenGLContext* share, Sequence* s, const QString &save = nullptr, int idivider = 0);
+	void start_render(QOpenGLContext* share, Sequence* s, const QString &save = nullptr, GLvoid *pixels = nullptr, int idivider = 0);
 	bool did_texture_fail();
 	void cancel();
 signals:
@@ -43,6 +43,7 @@ private:
 	bool texture_failed;
 	bool running;
 	QString save_fn;
+	GLvoid *pixel_buffer;
 };
 
 #endif // RENDERTHREAD_H

ui/viewerwidget.cpp

@@ -229,6 +229,10 @@ void ViewerWidget::frame_update() {
 	}
 }
 
+RenderThread *ViewerWidget::get_renderer() {
+	return renderer;
+}
+
 //void ViewerWidget::resizeGL(int w, int h)
 //{
 //}

ui/viewerwidget.h

@@ -44,6 +44,7 @@ public:
 	bool force_quit;
 
 	void frame_update();
+	RenderThread* get_renderer();
 public slots:
 	void set_waveform_scroll(int s);
 protected: