fix the rendering

src/mesh_view.cpp

@@ -1,11 +1,13 @@
 #include "mesh_view.h"
 #include <QOpenGLContext>
+#include <QOpenGLFunctions_2_1>
 
 
 MeshView::MeshView(const MyMesh &mesh, QOpenGLShaderProgram &program)
 	: buffer(QOpenGLBuffer::VertexBuffer),
+	  nverts(mesh.n_faces() * 3),
 	  mesh(mesh) {
-    GLfloat *verts = new GLfloat[mesh.n_faces() * 3 * 6];
+    QVector<GLfloat> verts(nverts * 6);
 	size_t i = 0;
 	for (const FaceHandle face : mesh.faces()) {
 		for (const VertexHandle vec : mesh.fv_range(face)) {
@@ -24,8 +26,7 @@ MeshView::MeshView(const MyMesh &mesh, QOpenGLShaderProgram &program)
 		buffer.create();
 		buffer.bind();
 		buffer.setUsagePattern(QOpenGLBuffer::StreamDraw);
-		buffer.allocate(verts, nverts * 6 * sizeof (GLfloat));
-		delete[] verts;
+		buffer.allocate(verts.constData(), nverts * 6 * sizeof (GLfloat));
 		program.setAttributeBuffer("pos", GL_FLOAT, 0, 3, 6 * sizeof (GLfloat));
 		program.enableAttributeArray("pos");
 		program.setAttributeBuffer("col", GL_FLOAT, 3 * sizeof (GLfloat), 3, 6 * sizeof (GLfloat));
@@ -43,10 +44,11 @@ MeshView::~MeshView() {
 void MeshView::paint(QOpenGLShaderProgram &program) {
 	QOpenGLContext *ctx = QOpenGLContext::currentContext();
 	QOpenGLExtraFunctions *glf = ctx->extraFunctions();
-	void (*glPolygonMode)(GLenum, GLenum) = nullptr;
-	glPolygonMode = (typeof glPolygonMode) ctx->getProcAddress("glPolygonMode");
-	if (!glPolygonMode)
-		qWarning("glPolygonMode not available");
+
+	QOpenGLFunctions_2_1 *glf21 = nullptr;
+	glf21 = ctx->versionFunctions<QOpenGLFunctions_2_1>();
+	if (!glf21)
+		qFatal("Failed to get OpenGL 2.1 functions");
 
 	program.setUniformValue("model", mesh.transform);
 
@@ -55,14 +57,14 @@ void MeshView::paint(QOpenGLShaderProgram &program) {
 		glf->glEnable(GL_POLYGON_OFFSET_FILL);
 		glf->glPolygonOffset(1.0, 2);
 		glf->glDrawArrays(GL_TRIANGLES, 0, nverts);
-		if (glPolygonMode) glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+		glf21->glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 		glf->glDisable(GL_POLYGON_OFFSET_FILL);
 
 		/* Wireframe */
 		program.setUniformValue("wireframe", 1);
 		glf->glDrawArrays(GL_TRIANGLES, 0, nverts);
-		if (glPolygonMode) glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-		glf->glLineWidth(3);
-		program.setUniformValue("wireframe", 1);
+		glf21->glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+		glf->glLineWidth(2);
+		program.setUniformValue("wireframe", 0);
 	}
 }

src/mesh_viewer.cpp

@@ -20,6 +20,13 @@ QSize MeshViewer::sizeHint() const {
 void MeshViewer::initializeGL() {
 	QOpenGLFunctions *glf = context()->functions();
 #ifdef QT_DEBUG
+	const QSurfaceFormat &format = context()->format();
+	qDebug("MeshViewer: OpenGL %s%d.%d %s",
+		   format.renderableType() == QSurfaceFormat::OpenGLES ? "ES " : "",
+		   format.majorVersion(), format.minorVersion(),
+		   format.profile() == QSurfaceFormat::CoreProfile ? "core profile"
+		   : (format.profile() == QSurfaceFormat::CompatibilityProfile ? "compatibility profile"
+			  : ""));
 	QOpenGLDebugLogger *logger = new QOpenGLDebugLogger(this);
 	if (!logger->initialize()) {
 		qDebug("OpenGL debug output unavailable");
@@ -30,24 +37,16 @@ void MeshViewer::initializeGL() {
 			});
     logger->startLogging();
 #endif
-
-	QOpenGLShader vertex_shader(QOpenGLShader::Vertex);
-	if (!vertex_shader.compileSourceFile(":/shader.vert")) {
-		qCritical() << vertex_shader.log();
+	if (!program.addShaderFromSourceFile(QOpenGLShader::Vertex,
+										 ":/shader.vert")) {
+		qFatal("%s", program.log().toUtf8().constData());
 	}
-
-	QOpenGLShader fragment_shader(QOpenGLShader::Fragment);
-	if (fragment_shader.compileSourceFile(":/shader.frag")) {
-		qCritical() << fragment_shader.log();
-	}
-	if (!program.addShader(&vertex_shader)) {
-		qCritical() << program.log();
-	}
-	if (!program.addShader(&fragment_shader)) {
-		qCritical() << program.log();
+	if (!program.addShaderFromSourceFile(QOpenGLShader::Fragment,
+										 ":/shader.frag")) {
+		qFatal("%s", program.log().toUtf8().constData());
 	}
 	if (!program.link()) {
-		qCritical() << program.log();
+		qFatal("%s", program.log().toUtf8().constData());
 	}
 	program.bind();
 
@@ -59,7 +58,7 @@ void MeshViewer::initializeGL() {
 	glf->glEnable(GL_DEPTH_TEST);
 	glf->glEnable(GL_MULTISAMPLE);
 
-	qDebug("Mesh viewer: initialization complete");
+	qDebug("MeshViewer: initialization complete");
 	emit initialized();
 }
 
@@ -76,6 +75,7 @@ void MeshViewer::paintGL() {
 	QMatrix4x4 trans;
 	trans.translate(0, 0, -cam_dist);
 	QMatrix4x4 view = trans * rot;
+	program.bind();
 	program.setUniformValue("view", view);
 	for (MeshView &m : meshes) {
 		m.paint(program);

src/shader.frag

@@ -5,9 +5,9 @@ uniform bool wireframe;
 uniform float alpha;
 
 void main() {
-	if (!wireframe)
-		// gl_FragColor = vec4(wf_col, alpha);
-		gl_FragColor = vec4(.5, .5, .5, 1);
+	if (wireframe)
+		gl_FragColor = vec4(wf_col, alpha);
 	else
-		gl_FragColor = vec4(frag_col, alpha);
+		// gl_FragColor = vec4(frag_col, alpha);
+		gl_FragColor = vec4(.5, .5, .5, alpha);
 }