fixed sorting, wont use qpainter(this), need to use pixmap with texture sampling

shaders/fragment.glsl

@@ -4,10 +4,10 @@ out vec4 FragColor;
 
 in vec3 color;
 
-uniform bool drawPoints;
+uniform bool drawPoints = false;
 
 void main() {
-    if (drawPoints){
+    if (drawPoints == true){
         vec2 coord = gl_PointCoord - vec2(0.5);
         if (length(coord) > 0.5)
             discard;
@@ -18,5 +18,4 @@ void main() {
     } else {
         FragColor = vec4(color, 1);
     }
-
 }

shaders/vertex.glsl

@@ -6,7 +6,7 @@ layout (location = 2) in float vMassRadius;
 
 uniform mat3 VP;
 
-uniform bool drawPoints;
+uniform bool drawPoints = false;
 uniform float screenSizePixels;
 uniform float screenSizeMeters;
 uniform float depthOffset;
@@ -14,9 +14,9 @@ uniform float depthOffset;
 out vec3 color;
 
 void main() {
-    if (drawPoints){
+    if (drawPoints == true){
         gl_Position = vec4(VP * vPos, 1.0);
-        gl_Position.z -= depthOffset * 0.25;
+        gl_Position.z -= depthOffset * 0.5;
         gl_PointSize = vMassRadius / screenSizeMeters * screenSizePixels * 2;
     } else {
         gl_Position = vec4(VP * vPos, 1.0);

src/GLWidget.cpp

@@ -37,7 +37,7 @@ void GLWidget::initializeGL() {
 	glEnable(GL_PRIMITIVE_RESTART_FIXED_INDEX);
 	glEnable(GL_DEPTH_TEST);
 	glDepthFunc(GL_LESS);
-	glDepthMask(GL_TRUE);
+	glClearDepth(1);
 	glClearColor(.15, .15, .15, 1);
 
 	std::vector<Pendulum*> empty;
@@ -45,12 +45,12 @@ void GLWidget::initializeGL() {
 }
 
 void GLWidget::paintGL() {
-	auto p = new QPainter(this);
+	QPixmap img(size());
-	p->setRenderHint(QPainter::Antialiasing);
+	auto p = new QPainter(&img);
-	p->beginNativePainting();
 
 	// Native OpenGL
 	{
+
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
 		program->bind();
@@ -75,7 +75,6 @@ void GLWidget::paintGL() {
 
 		glBindVertexArray(0);
 	}
-	p->endNativePainting();
 
 	// FPS
 	{
@@ -105,7 +104,7 @@ bool GLWidget::AnyDialogOpen() {
 
 void GLWidget::initGPUMemory(const std::vector<Pendulum *> *pendula) {
 
-	int segmentCount = std::transform_reduce(pendula->begin(), pendula->end(), 0, [](int prev, int curr){
+	int pointCount = std::transform_reduce(pendula->begin(), pendula->end(), 0, [](int prev, int curr){
 		return prev + curr + 1;
 	}, [](const Pendulum * p){
 		return p->X.size();
@@ -118,8 +117,9 @@ void GLWidget::initGPUMemory(const std::vector<Pendulum *> *pendula) {
 
 	if (!pendula->empty()){
 
-		float depth = 1.f - 1.f / float(segmentCount);
+		float margin = 0.1f;
-		depthOffset = 1.f * 2 / float(segmentCount);
+		depthOffset = 2 * (1.f - margin) / float(pointCount);
+		float depth = (1.f - margin) - (1.f - margin) / float(pointCount) + depthOffset;
 
 		GLuint index = 0;
 		for (const auto p : *pendula){
@@ -127,8 +127,7 @@ void GLWidget::initGPUMemory(const std::vector<Pendulum *> *pendula) {
 			// Origin point
 			positions.push_back(0);
 			positions.push_back(0);
-			positions.push_back(depth);
+			positions.push_back(depth -= depthOffset);
-			depth -= depthOffset;
 
 			colors.resize(colors.size() + 3);
 			float * red = &colors.back() - 2;
@@ -143,8 +142,7 @@ void GLWidget::initGPUMemory(const std::vector<Pendulum *> *pendula) {
 				Vector pos = p->X[segment];
 				positions.push_back(float(pos.x));
 				positions.push_back(float(pos.y));
-				positions.push_back(depth);
+				positions.push_back(depth -= depthOffset);
-				depth -= depthOffset;
 
 				colors.resize(colors.size() + 3);
 				red = &colors.back() - 2;

src/main.cpp

@@ -8,15 +8,15 @@
 using namespace std::chrono;
 
 int main(int argc, char* argv[]) {
-	QApplication app(argc, argv);
-
 	QSurfaceFormat fmt;
 	fmt.setSamples(4);
-	fmt.setDepthBufferSize(24);
+	fmt.setDepthBufferSize(32);
-	//fmt.setVersion(3, 3);
+	fmt.setVersion(3, 3);
-	//fmt.setProfile(QSurfaceFormat::CoreProfile);
+	fmt.setProfile(QSurfaceFormat::CoreProfile);
 	QSurfaceFormat::setDefaultFormat(fmt);
 
+	QApplication app(argc, argv);
+
 	MainWindow w;
 	w.show();