OpenGL modernization: GLSpectrum moved back to QGLWidget

include/gui/glscope.h

@@ -23,6 +23,7 @@
 #include <QTimer>
 #include <QMutex>
 #include <QFont>
+#include <QMatrix4x4>
 #include "dsp/dsptypes.h"
 #include "dsp/scopevis.h"
 #include "gui/scaleengine.h"
@@ -137,32 +138,47 @@ private:
 	// graphics stuff
 	QRectF m_glScopeRect1;
 	QRectF m_glScopeRect2;
+	QMatrix4x4 m_glScopeMatrix1;
+	QMatrix4x4 m_glScopeMatrix2;
+
 	int m_displayGridIntensity;
 	int m_displayTraceIntensity;
+
 	QRectF m_glLeft1ScaleRect;
 	QRectF m_glRight1ScaleRect;
 	QRectF m_glLeft2ScaleRect;
 	QRectF m_glBot1ScaleRect;
 	QRectF m_glBot2ScaleRect;
+
+	QMatrix4x4 m_glLeft1ScaleMatrix;
+	QMatrix4x4 m_glRight1ScaleMatrix;
+	QMatrix4x4 m_glLeft2ScaleMatrix;
+	QMatrix4x4 m_glBot1ScaleMatrix;
+	QMatrix4x4 m_glBot2ScaleMatrix;
+
 	QPixmap m_left1ScalePixmap;
 	QPixmap m_left2ScalePixmap;
 	QPixmap m_bot1ScalePixmap;
 	QPixmap m_bot2ScalePixmap;
 	QPixmap m_powerOverlayPixmap1;
+
 	bool m_left1ScaleTextureAllocated;
 	bool m_left2ScaleTextureAllocated;
 	bool m_bot1ScaleTextureAllocated;
 	bool m_bot2ScaleTextureAllocated;
 	bool m_powerOverlayTextureAllocated1;
+
 	GLuint m_left1ScaleTexture;
 	GLuint m_left2ScaleTexture;
 	GLuint m_bot1ScaleTexture;
 	GLuint m_bot2ScaleTexture;
 	GLuint m_powerOverlayTexture1;
+
 	ScaleEngine m_x1Scale;
 	ScaleEngine m_x2Scale;
 	ScaleEngine m_y1Scale;
 	ScaleEngine m_y2Scale;
+
 	QFont m_powerOverlayFont;
 
 	void initializeGL();

include/gui/glspectrum.h

@@ -27,6 +27,7 @@
 #include <QOpenGLBuffer>
 #include <QOpenGLVertexArrayObject>
 #include <QMatrix4x4>
+#include <QGLWidget>
 #include "dsp/dsptypes.h"
 #include "gui/scaleengine.h"
 #include "gui/glshadersimple.h"
@@ -36,7 +37,7 @@
 
 class QOpenGLShaderProgram;
 
-class SDRANGEL_API GLSpectrum : public QOpenGLWidget {
+class SDRANGEL_API GLSpectrum : public QGLWidget {
 	Q_OBJECT
 
 public:

sdrbase/gui/glscope.cpp

@@ -255,10 +255,12 @@ void GLScope::paintGL()
 		glPushMatrix();
 		glTranslatef(m_glScopeRect1.x(), m_glScopeRect1.y(), 0);
 		glScalef(m_glScopeRect1.width(), m_glScopeRect1.height(), 1);
+
 		glEnable(GL_BLEND);
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 		glLineWidth(1.0f);
 		glColor4f(1, 1, 1, 0.5);
+
 #ifdef GL_DEPRECATED
 		glBegin(GL_LINE_LOOP);
 		glVertex2f(1, 1);
@@ -274,27 +276,28 @@ void GLScope::paintGL()
 				0, 0,
 				1, 0
 			};
-#ifdef GL_ANDROID
+
-			glEnableVertexAttribArray(GL_VERTEX_ARRAY);
+			glEnableClientState(GL_VERTEX_ARRAY);
-			glVertexAttribPointer(GL_VERTEX_ARRAY, 2, GL_FLOAT, GL_FALSE, 0, q3);
-			glDrawArrays(GL_LINE_LOOP, 0, 4);
-			glDisableVertexAttribArray(GL_VERTEX_ARRAY);
-#else
-		    glEnableClientState(GL_VERTEX_ARRAY);
 		    glVertexPointer(2, GL_FLOAT, 0, q3);
 		    glDrawArrays(GL_LINE_LOOP, 0, 4);
 		    glDisableClientState(GL_VERTEX_ARRAY);
-#endif
 		}
 #endif
 		glDisable(GL_BLEND);
+		glPopMatrix();
+
+		glPushMatrix();
+		glTranslatef(m_glScopeRect1.x(), m_glScopeRect1.y(), 0);
+		glScalef(m_glScopeRect1.width(), m_glScopeRect1.height(), 1);
 
 		// paint grid
 		const ScaleEngine::TickList* tickList;
 		const ScaleEngine::Tick* tick;
+
 		glEnable(GL_BLEND);
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 		glLineWidth(1.0f);
+
 		if (m_mode == ModeIQPolar) {
 			glColor4f(1, 1, 0.25f, m_displayGridIntensity / 100.0);
 		} else {
@@ -302,6 +305,7 @@ void GLScope::paintGL()
 		}
 		// Horizontal Y1
 		tickList = &m_y1Scale.getTickList();
+
 #ifdef GL_DEPRECATED
 		for(int i= 0; i < tickList->count(); i++) {
 			tick = &(*tickList)[i];
@@ -345,9 +349,16 @@ void GLScope::paintGL()
 #endif
 		}
 #endif
+		glPopMatrix();
+
+		glPushMatrix();
+		glTranslatef(m_glScopeRect1.x(), m_glScopeRect1.y(), 0);
+		glScalef(m_glScopeRect1.width(), m_glScopeRect1.height(), 1);
+
 		// Vertical X1
 		glColor4f(1, 1, 1, m_displayGridIntensity / 100.0);
 		tickList = &m_x1Scale.getTickList();
+
 #ifdef GL_DEPRECATED
 		for(int i= 0; i < tickList->count(); i++) {
 			tick = &(*tickList)[i];
@@ -1723,18 +1734,47 @@ void GLScope::applyConfig()
 					(float) (width() - 2*leftMargin - rightMargin) / (float) width(),
 					(float) scopeHeight / (float) height()
 				);
+				m_glScopeMatrix1.setToIdentity();
+				m_glScopeMatrix1.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*topMargin / (float) height())
+				);
+				m_glScopeMatrix1.scale (
+					(float) 2*(width() - 2*leftMargin - rightMargin) / (float) width(),
+					(float) -2*scopeHeight / (float) height()
+				);
+
 				m_glBot1ScaleRect = QRectF(
 					(float) leftMargin / (float) width(),
 					(float) (scopeHeight + topMargin + 1) / (float) height(),
 					(float) (width() - 2*leftMargin - rightMargin) / (float) width(),
 					(float) (botMargin - 1) / (float) height()
 				);
+				m_glBot1ScaleMatrix.setToIdentity();
+				m_glBot1ScaleMatrix.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*(scopeHeight + topMargin + 1) / (float) height())
+				);
+				m_glBot1ScaleMatrix.scale (
+					(float) 2*(width() - 2*leftMargin - rightMargin) / (float) width(),
+					(float) -2*(botMargin - 1) / (float) height()
+				);
+
 				m_glRight1ScaleRect = QRectF(
 					(float) (width() - leftMargin) / (float) width(),
 					(float) topMargin / (float) height(),
 					(float) (leftMargin-1) / (float) width(),
 					(float) scopeHeight / (float) height()
 				);
+				m_glRight1ScaleMatrix.setToIdentity();
+				m_glRight1ScaleMatrix.translate (
+					-1.0f + ((float)(2*(width() - leftMargin)) / (float) width()),
+					 1.0f - ((float) 2*topMargin / (float) height())
+				);
+				m_glRight1ScaleMatrix.scale (
+					(float) 2*(leftMargin-1) / (float) width(),
+					(float) -2*scopeHeight / (float) height()
+				);
 			}
 			else
 			{
@@ -1744,13 +1784,33 @@ void GLScope::applyConfig()
 					(float) scopeWidth / (float) width(),
 					(float) scopeHeight / (float) height()
 				);
+				m_glScopeMatrix1.setToIdentity();
+				m_glScopeMatrix1.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*topMargin / (float) height())
+				);
+				m_glScopeMatrix1.scale (
+					(float) 2*scopeWidth / (float) width(),
+					(float) -2*scopeHeight / (float) height()
+				);
+
 				m_glBot1ScaleRect = QRectF(
 					(float) leftMargin / (float) width(),
 					(float) (scopeHeight + topMargin + 1) / (float) height(),
 					(float) scopeWidth / (float) width(),
 					(float) (botMargin - 1) / (float) height()
 				);
+				m_glBot1ScaleMatrix.setToIdentity();
+				m_glBot1ScaleMatrix.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*(scopeHeight + topMargin + 1) / (float) height())
+				);
+				m_glBot1ScaleMatrix.scale (
+					(float) 2*scopeWidth / (float) width(),
+					(float) -2*(botMargin - 1) / (float) height()
+				);
 			}
+
 			m_glLeft1ScaleRect = QRectF(
 				0,
 				(float) topMargin / (float) height(),
@@ -1758,6 +1818,16 @@ void GLScope::applyConfig()
 				(float) scopeHeight / (float) height()
 			);
 
+			m_glLeft1ScaleMatrix.setToIdentity();
+			m_glLeft1ScaleMatrix.translate (
+				-1.0f,
+				 1.0f - ((float) 2*topMargin / (float) height())
+			);
+			m_glLeft1ScaleMatrix.scale (
+				(float) 2*(leftMargin-1) / (float) width(),
+				(float) -2*scopeHeight / (float) height()
+			);
+
 			{ // Y1 scale
 				m_y1Scale.setSize(scopeHeight);
 
@@ -1839,18 +1909,47 @@ void GLScope::applyConfig()
 					(float) scopeDim / (float)width(),
 					(float) scopeDim / (float)height()
 				);
+				m_glScopeMatrix2.setToIdentity();
+				m_glScopeMatrix2.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*(botMargin + topMargin + scopeDim) / (float) height())
+				);
+				m_glScopeMatrix2.scale (
+					(float) 2*scopeDim / (float) width(),
+					(float) -2*scopeDim / (float) height()
+				);
+
 				m_glLeft2ScaleRect = QRectF(
 					0,
 					(float) (topMargin + scopeDim + botMargin) / (float) height(),
 					(float) (leftMargin-1) / (float) width(),
 					(float) scopeDim / (float) height()
 				);
+				m_glLeft2ScaleMatrix.setToIdentity();
+				m_glLeft2ScaleMatrix.translate (
+					-1.0f,
+					 1.0f - ((float) 2*(topMargin + scopeDim + botMargin) / (float) height())
+				);
+				m_glLeft2ScaleMatrix.scale (
+					(float) 2*(leftMargin-1) / (float) width(),
+					(float) -2*scopeDim / (float) height()
+				);
+
 				m_glBot2ScaleRect = QRectF(
 					(float) leftMargin / (float) width(),
 					(float) (scopeDim + topMargin + scopeDim + botMargin + 1) / (float) height(),
 					(float) scopeDim / (float) width(),
 					(float) (botMargin - 1) / (float) height()
 				);
+				m_glBot2ScaleMatrix.setToIdentity();
+				m_glBot2ScaleMatrix.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*(scopeDim + topMargin + scopeDim + botMargin + 1) / (float) height())
+				);
+				m_glBot2ScaleMatrix.scale (
+					(float) 2*scopeDim / (float) width(),
+					(float) -2*(botMargin - 1) / (float) height()
+				);
 			}
 			else
 			{
@@ -1860,18 +1959,47 @@ void GLScope::applyConfig()
 					(float) scopeWidth / (float)width(),
 					(float) scopeHeight / (float)height()
 				);
+				m_glScopeMatrix2.setToIdentity();
+				m_glScopeMatrix2.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*(botMargin + topMargin + scopeHeight) / (float) height())
+				);
+				m_glScopeMatrix2.scale (
+					(float) 2*scopeWidth / (float) width(),
+					(float) -2*scopeHeight / (float) height()
+				);
+
 				m_glLeft2ScaleRect = QRectF(
 					0,
 					(float) (topMargin + scopeHeight + botMargin) / (float) height(),
 					(float) (leftMargin-1) / (float) width(),
 					(float) scopeHeight / (float) height()
 				);
+				m_glLeft2ScaleMatrix.setToIdentity();
+				m_glLeft2ScaleMatrix.translate (
+					-1.0f,
+					 1.0f - ((float) 2*(topMargin + scopeHeight + botMargin) / (float) height())
+				);
+				m_glLeft2ScaleMatrix.scale (
+					(float) 2*(leftMargin-1) / (float) width(),
+					(float) -2*scopeHeight / (float) height()
+				);
+
 				m_glBot2ScaleRect = QRectF(
 					(float) leftMargin / (float) width(),
 					(float) (scopeHeight + topMargin + scopeHeight + botMargin + 1) / (float) height(),
 					(float) scopeWidth / (float) width(),
 					(float) (botMargin - 1) / (float) height()
 				);
+				m_glBot2ScaleMatrix.setToIdentity();
+				m_glBot2ScaleMatrix.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*(scopeHeight + topMargin + scopeHeight + botMargin + 1) / (float) height())
+				);
+				m_glBot2ScaleMatrix.scale (
+					(float) 2*scopeWidth / (float) width(),
+					(float) -2*(botMargin - 1) / (float) height()
+				);
 			}
 			{ // Y2 scale
 				m_y2Scale.setSize(scopeHeight);
@@ -1969,18 +2097,47 @@ void GLScope::applyConfig()
 					(float) (scopeWidth-leftMargin) / (float) width(),
 					(float) scopeHeight / (float) height()
 				);
+				m_glScopeMatrix1.setToIdentity();
+				m_glScopeMatrix1.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*topMargin / (float) height())
+				);
+				m_glScopeMatrix1.scale (
+					(float) 2*(scopeWidth-leftMargin) / (float) width(),
+					(float) -2*scopeHeight / (float) height()
+				);
+
 				m_glBot1ScaleRect = QRectF(
 					(float) leftMargin / (float) width(),
 					(float) (scopeHeight + topMargin + 1) / (float) height(),
 					(float) (scopeWidth-leftMargin) / (float) width(),
 					(float) (botMargin - 1) / (float) height()
 				);
+				m_glBot1ScaleMatrix.setToIdentity();
+				m_glBot1ScaleMatrix.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*(scopeHeight + topMargin + 1) / (float) height())
+				);
+				m_glBot1ScaleMatrix.scale (
+					(float) 2*(scopeWidth-leftMargin) / (float) width(),
+					(float) -2*(botMargin - 1) / (float) height()
+				);
+
 				m_glRight1ScaleRect = QRectF(
 					(float) (scopeWidth) / (float) width(),
 					(float) topMargin / (float) height(),
 					(float) (leftMargin-1) / (float) width(),
 					(float) scopeHeight / (float) height()
 				);
+				m_glRight1ScaleMatrix.setToIdentity();
+				m_glRight1ScaleMatrix.translate (
+					-1.0f + ((float) 2*scopeWidth / (float) width()),
+					 1.0f - ((float) 2*topMargin / (float) height())
+				);
+				m_glRight1ScaleMatrix.scale (
+					(float) 2*(leftMargin-1) / (float) width(),
+					(float) -2*scopeHeight / (float) height()
+				);
 			}
 			else
 			{
@@ -1990,13 +2147,33 @@ void GLScope::applyConfig()
 					(float) scopeWidth / (float) width(),
 					(float) scopeHeight / (float) height()
 				);
+				m_glScopeMatrix1.setToIdentity();
+				m_glScopeMatrix1.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*topMargin / (float) height())
+				);
+				m_glScopeMatrix1.scale (
+					(float) 2*scopeWidth / (float) width(),
+					(float) -2*scopeHeight / (float) height()
+				);
+
 				m_glBot1ScaleRect = QRectF(
 					(float) leftMargin / (float) width(),
 					(float) (scopeHeight + topMargin + 1) / (float) height(),
 					(float) scopeWidth / (float) width(),
 					(float) (botMargin - 1) / (float) height()
 				);
+				m_glBot1ScaleMatrix.setToIdentity();
+				m_glBot1ScaleMatrix.translate (
+					-1.0f + ((float) 2*leftMargin / (float) width()),
+					 1.0f - ((float) 2*(scopeHeight + topMargin + 1) / (float) height())
+				);
+				m_glBot1ScaleMatrix.scale (
+					(float) 2*scopeWidth / (float) width(),
+					(float) -2*(botMargin - 1) / (float) height()
+				);
 			}
+
 			m_glLeft1ScaleRect = QRectF(
 				0,
 				(float) topMargin / (float) height(),
@@ -2004,6 +2181,16 @@ void GLScope::applyConfig()
 				(float) scopeHeight / (float) height()
 			);
 
+			m_glLeft1ScaleMatrix.setToIdentity();
+			m_glLeft1ScaleMatrix.translate (
+				-1.0f,
+				 1.0f - ((float) 2*topMargin / (float) height())
+			);
+			m_glLeft1ScaleMatrix.scale (
+				(float) 2*(leftMargin-1) / (float) width(),
+				(float) -2*scopeHeight / (float) height()
+			);
+
 			{ // Y1 scale
 				m_y1Scale.setSize(scopeHeight);
 
@@ -2085,18 +2272,47 @@ void GLScope::applyConfig()
 					(float) scopeDim / (float)width(),
 					(float)(height() - topMargin - botMargin) / (float)height()
 				);
+				m_glScopeMatrix2.setToIdentity();
+				m_glScopeMatrix2.translate (
+					-1.0f + ((float) 2*(leftMargin + scopeWidth + leftMargin) / (float) width()),
+					 1.0f - ((float) 2*topMargin / (float) height())
+				);
+				m_glScopeMatrix2.scale (
+					(float) 2*scopeDim / (float) width(),
+					(float) -2*(height() - topMargin - botMargin) / (float) height()
+				);
+
 				m_glLeft2ScaleRect = QRectF(
 					(float) (leftMargin + scopeWidth) / (float) width(),
 					(float) topMargin / (float) height(),
 					(float) (leftMargin-1) / (float) width(),
 					(float) scopeHeight / (float) height()
 				);
+				m_glLeft2ScaleMatrix.setToIdentity();
+				m_glLeft2ScaleMatrix.translate (
+					-1.0f + (float) 2*(leftMargin + scopeWidth) / (float) width(),
+					 1.0f - ((float) 2*topMargin / (float) height())
+				);
+				m_glLeft2ScaleMatrix.scale (
+					(float) 2*(leftMargin-1) / (float) width(),
+					(float) -2*scopeHeight / (float) height()
+				);
+
 				m_glBot2ScaleRect = QRectF(
 					(float) (leftMargin + leftMargin + scopeWidth) / (float) width(),
 					(float) (scopeHeight + topMargin + 1) / (float) height(),
 					(float) scopeDim / (float) width(),
 					(float) (botMargin - 1) / (float) height()
 				);
+				m_glBot2ScaleMatrix.setToIdentity();
+				m_glBot2ScaleMatrix.translate (
+					-1.0f + ((float) 2*(leftMargin + leftMargin + scopeWidth) / (float) width()),
+					 1.0f - ((float) 2*(scopeHeight + topMargin + 1) / (float) height())
+				);
+				m_glBot2ScaleMatrix.scale (
+					(float) 2*scopeDim / (float) width(),
+					(float) -2*(botMargin - 1) / (float) height()
+				);
 			}
 			else
 			{
@@ -2106,18 +2322,47 @@ void GLScope::applyConfig()
 					(float)((width() - leftMargin - leftMargin - rightMargin) / 2) / (float)width(),
 					(float)(height() - topMargin - botMargin) / (float)height()
 				);
+				m_glScopeMatrix2.setToIdentity();
+				m_glScopeMatrix2.translate (
+					-1.0f + ((float) 2*(leftMargin + leftMargin + ((width() - leftMargin - leftMargin - rightMargin) / 2)) / (float) width()),
+					 1.0f - ((float) 2*topMargin / (float) height())
+				);
+				m_glScopeMatrix2.scale (
+					(float) 2*((width() - leftMargin - leftMargin - rightMargin) / 2) / (float) width(),
+					(float) -2*(height() - topMargin - botMargin) / (float) height()
+				);
+
 				m_glLeft2ScaleRect = QRectF(
 					(float) (leftMargin + scopeWidth) / (float) width(),
 					(float) topMargin / (float) height(),
 					(float) (leftMargin-1) / (float) width(),
 					(float) scopeHeight / (float) height()
 				);
+				m_glLeft2ScaleMatrix.setToIdentity();
+				m_glLeft2ScaleMatrix.translate (
+					-1.0f + (float) 2*(leftMargin + scopeWidth) / (float) width(),
+					 1.0f - ((float) 2*topMargin / (float) height())
+				);
+				m_glLeft2ScaleMatrix.scale (
+					(float) 2*(leftMargin-1) / (float) width(),
+					(float) -2*scopeHeight / (float) height()
+				);
+
 				m_glBot2ScaleRect = QRectF(
 					(float) (leftMargin + leftMargin + scopeWidth) / (float) width(),
 					(float) (scopeHeight + topMargin + 1) / (float) height(),
 					(float) scopeWidth / (float) width(),
 					(float) (botMargin - 1) / (float) height()
 				);
+				m_glBot2ScaleMatrix.setToIdentity();
+				m_glBot2ScaleMatrix.translate (
+					-1.0f + ((float) 2*(leftMargin + leftMargin + scopeWidth) / (float) width()),
+					 1.0f - ((float) 2*(scopeHeight + topMargin + 1) / (float) height())
+				);
+				m_glBot2ScaleMatrix.scale (
+					(float) 2*scopeWidth / (float) width(),
+					(float) -2*(botMargin - 1) / (float) height()
+				);
 			}
 			{ // Y2 scale
 				m_y2Scale.setSize(scopeHeight);
@@ -2216,18 +2461,47 @@ void GLScope::applyConfig()
 				(float) (scopeWidth-leftMargin) / (float) width(),
 				(float) scopeHeight / (float) height()
 			);
+			m_glScopeMatrix1.setToIdentity();
+			m_glScopeMatrix1.translate (
+				-1.0f + ((float) 2*leftMargin / (float) width()),
+				 1.0f - ((float) 2*topMargin / (float) height())
+			);
+			m_glScopeMatrix1.scale (
+				(float) 2*(scopeWidth-leftMargin) / (float) width(),
+				(float) -2*scopeHeight / (float) height()
+			);
+
 			m_glBot1ScaleRect = QRectF(
 				(float) leftMargin / (float) width(),
 				(float) (scopeHeight + topMargin + 1) / (float) height(),
 				(float) (scopeWidth-leftMargin) / (float) width(),
 				(float) (botMargin - 1) / (float) height()
 			);
+			m_glBot1ScaleMatrix.setToIdentity();
+			m_glBot1ScaleMatrix.translate (
+				-1.0f + ((float) 2*leftMargin / (float) width()),
+				 1.0f - ((float) 2*(scopeHeight + topMargin + 1) / (float) height())
+			);
+			m_glBot1ScaleMatrix.scale (
+				(float) 2*(scopeWidth-leftMargin) / (float) width(),
+				(float) -2*(botMargin - 1) / (float) height()
+			);
+
 			m_glRight1ScaleRect = QRectF(
 				(float) (width() - leftMargin) / (float) width(),
 				(float) topMargin / (float) height(),
 				(float) (leftMargin-1) / (float) width(),
 				(float) scopeHeight / (float) height()
 			);
+			m_glRight1ScaleMatrix.setToIdentity();
+			m_glRight1ScaleMatrix.translate (
+				-1.0f + ((float) (2*width() - leftMargin) / (float) width()),
+				 1.0f - ((float) 2*topMargin / (float) height())
+			);
+			m_glRight1ScaleMatrix.scale (
+				(float) 2*(leftMargin-1) / (float) width(),
+				(float) -2*scopeHeight / (float) height()
+			);
 		}
 		else
 		{
@@ -2237,13 +2511,33 @@ void GLScope::applyConfig()
 				(float) scopeWidth / (float) width(),
 				(float) scopeHeight / (float) height()
 			);
+			m_glScopeMatrix1.setToIdentity();
+			m_glScopeMatrix1.translate (
+				-1.0f + ((float) 2*leftMargin / (float) width()),
+				 1.0f - ((float) 2*topMargin / (float) height())
+			);
+			m_glScopeMatrix1.scale (
+				(float) 2*scopeWidth / (float) width(),
+				(float) -2*scopeHeight / (float) height()
+			);
+
 			m_glBot1ScaleRect = QRectF(
 				(float) leftMargin / (float) width(),
 				(float) (scopeHeight + topMargin + 1) / (float) height(),
 				(float) scopeWidth / (float) width(),
 				(float) (botMargin - 1) / (float) height()
 			);
+			m_glBot1ScaleMatrix.setToIdentity();
+			m_glBot1ScaleMatrix.translate (
+				-1.0f + ((float) 2*leftMargin / (float) width()),
+				 1.0f - ((float) 2*(scopeHeight + topMargin + 1) / (float) height())
+			);
+			m_glBot1ScaleMatrix.scale (
+				(float) 2*scopeWidth / (float) width(),
+				(float) -2*(botMargin - 1) / (float) height()
+			);
 		}
+
 		m_glLeft1ScaleRect = QRectF(
 			0,
 			(float) topMargin / (float) height(),
@@ -2251,6 +2545,16 @@ void GLScope::applyConfig()
 			(float) scopeHeight / (float) height()
 		);
 
+		m_glLeft1ScaleMatrix.setToIdentity();
+		m_glLeft1ScaleMatrix.translate (
+			-1.0f,
+			 1.0f - ((float) 2*topMargin / (float) height())
+		);
+		m_glLeft1ScaleMatrix.scale (
+			(float) 2*(leftMargin-1) / (float) width(),
+			(float) -2*scopeHeight / (float) height()
+		);
+
 		{ // Y1 scale
 			m_y1Scale.setSize(scopeHeight);
 
@@ -2376,18 +2680,47 @@ void GLScope::applyConfig()
 				(float) scopeDim / (float) width(),
 				(float) scopeDim / (float) height()
 			);
+			m_glScopeMatrix2.setToIdentity();
+			m_glScopeMatrix2.translate (
+				-1.0f + ((float) 2*leftMargin / (float) width()),
+				 1.0f - ((float) 2*topMargin / (float) height())
+			);
+			m_glScopeMatrix2.scale (
+				(float) 2*scopeDim / (float) width(),
+				(float) -2*scopeDim / (float) height()
+			);
+
 			m_glLeft2ScaleRect = QRectF(
 				0,
 				(float) topMargin / (float) height(),
 				(float) (leftMargin-1) / (float) width(),
 				(float) scopeDim / (float) height()
 			);
+			m_glLeft2ScaleMatrix.setToIdentity();
+			m_glLeft2ScaleMatrix.translate (
+				-1.0f,
+				 1.0f - ((float) 2*topMargin / (float) height())
+			);
+			m_glLeft2ScaleMatrix.scale (
+				(float) 2*(leftMargin-1) / (float) width(),
+				(float) -2*scopeDim / (float) height()
+			);
+
 			m_glBot2ScaleRect = QRectF(
 				(float) leftMargin / (float) width(),
 				(float) (scopeDim + topMargin + 1) / (float) height(),
 				(float) scopeDim / (float) width(),
 				(float) (botMargin - 1) / (float) height()
 			);
+			m_glBot2ScaleMatrix.setToIdentity();
+			m_glBot2ScaleMatrix.translate (
+				-1.0f + ((float) 2*leftMargin / (float) width()),
+				 1.0f - ((float) 2*(scopeDim + topMargin + 1) / (float) height())
+			);
+			m_glBot2ScaleMatrix.scale (
+				(float) 2*scopeDim / (float) width(),
+				(float) -2*(botMargin - 1) / (float) height()
+			);
 		}
 		else
 		{
@@ -2397,18 +2730,47 @@ void GLScope::applyConfig()
 				(float) scopeWidth / (float) width(),
 				(float) scopeHeight / (float) height()
 			);
+			m_glScopeMatrix2.setToIdentity();
+			m_glScopeMatrix2.translate (
+				-1.0f + ((float) 2*leftMargin / (float) width()),
+				 1.0f - ((float) 2*topMargin / (float) height())
+			);
+			m_glScopeMatrix2.scale (
+				(float) 2*scopeWidth / (float) width(),
+				(float) -2*scopeHeight / (float) height()
+			);
+
 			m_glLeft2ScaleRect = QRectF(
 				0,
 				(float) topMargin / (float) height(),
 				(float) (leftMargin-1) / (float) width(),
 				(float) scopeHeight / (float) height()
 			);
+			m_glLeft2ScaleMatrix.setToIdentity();
+			m_glLeft2ScaleMatrix.translate (
+				-1.0f,
+				 1.0f - ((float) 2*topMargin / (float) height())
+			);
+			m_glLeft2ScaleMatrix.scale (
+				(float) 2*(leftMargin-1) / (float) width(),
+				(float) -2*scopeHeight / (float) height()
+			);
+
 			m_glBot2ScaleRect = QRectF(
 				(float) leftMargin / (float) width(),
 				(float) (scopeHeight + topMargin + 1) / (float) height(),
 				(float) scopeWidth / (float) width(),
 				(float) (botMargin - 1) / (float) height()
 			);
+			m_glBot2ScaleMatrix.setToIdentity();
+			m_glBot2ScaleMatrix.translate (
+				-1.0f + ((float) 2*leftMargin / (float) width()),
+				 1.0f - ((float) 2*(scopeHeight + topMargin + 1) / (float) height())
+			);
+			m_glBot2ScaleMatrix.scale (
+				(float) 2*scopeWidth / (float) width(),
+				(float) -2*(botMargin - 1) / (float) height()
+			);
 		}
 
 		{ // Y2 scale

sdrbase/gui/glspectrum.cpp

@@ -28,6 +28,7 @@
 #include <QDebug>
 
 GLSpectrum::GLSpectrum(QWidget* parent) :
+	QGLWidget(parent),
 	m_cursorState(CSNormal),
 	m_mouseInside(false),
 	m_changesPending(true),
@@ -2219,14 +2220,14 @@ void GLSpectrum::enterEvent(QEvent* event)
 {
 	m_mouseInside = true;
 	update();
-	QOpenGLWidget::enterEvent(event);
+	QGLWidget::enterEvent(event);
 }
 
 void GLSpectrum::leaveEvent(QEvent* event)
 {
 	m_mouseInside = false;
 	update();
-	QOpenGLWidget::enterEvent(event);
+	QGLWidget::enterEvent(event);
 }
 
 void GLSpectrum::tick()