diff --git a/resources.qrc b/resources.qrc
new file mode 100644
index 0000000..0f1d526
--- /dev/null
+++ b/resources.qrc
@@ -0,0 +1,6 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file alias="shader.vert">src/shader.vert</file>
+    <file alias="shader.frag">src/shader.frag</file>
+</qresource>
+</RCC>
diff --git a/src/main.cpp b/src/main.cpp
index 02d19ae..46736ee 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -8,9 +8,11 @@
 int main(int argc, char *argv[]) {
 	using namespace std;
 	QSurfaceFormat format;
-	format.setRenderableType(QSurfaceFormat::RenderableType::OpenGL);
-	format.setMajorVersion(2);
-	format.setMinorVersion(1);
+	format.setRenderableType(QSurfaceFormat::OpenGL);
+#ifndef QT_DEBUG
+	qDebug("Debug build");
+	format.setOption(QSurfaceFormat::DebugContext);
+#endif
 	QSurfaceFormat::setDefaultFormat(format);
 	QApplication app(argc, argv);
 	MeshProcessor *mesh_processor = nullptr;
diff --git a/src/mesh_view.cpp b/src/mesh_view.cpp
index 277e2db..57f7ad1 100644
--- a/src/mesh_view.cpp
+++ b/src/mesh_view.cpp
@@ -1,14 +1,12 @@
 #include "mesh_view.h"
-#include <QOpenGLFunctions_2_1>
+#include <QOpenGLContext>
 
 
-MeshView::MeshView(QOpenGLExtraFunctions *glf, const MyMesh &mesh,
-				   int pos_attr, int col_attr)
-	: glf(glf),
+MeshView::MeshView(const MyMesh &mesh, QOpenGLShaderProgram &program)
+	: buffer(QOpenGLBuffer::VertexBuffer),
 	  mesh(mesh) {
     GLfloat *verts = new GLfloat[mesh.n_faces() * 3 * 6];
 	size_t i = 0;
-
 	for (const FaceHandle face : mesh.faces()) {
 		for (const VertexHandle vec : mesh.fv_range(face)) {
 			verts[6*i + 0] = mesh.point(vec)[0];
@@ -21,53 +19,50 @@ MeshView::MeshView(QOpenGLExtraFunctions *glf, const MyMesh &mesh,
 		}
     }
 
-    delete[] verts;
-
-	GLuint vao, vbo;
-    glf->glGenVertexArrays(1, &vao);
-	glf->glGenBuffers(1, &vbo);
-
-    glf->glBindVertexArray(vao);
-	glf->glBindBuffer(GL_ARRAY_BUFFER, vbo);
-	glf->glBufferData(GL_ARRAY_BUFFER, nverts * 6 * sizeof (GLfloat), verts, GL_DYNAMIC_DRAW);
-	glf->glVertexAttribPointer(pos_attr, 3, GL_FLOAT, GL_FALSE, 6 * sizeof (GLfloat), 0);
-	glf->glEnableVertexAttribArray(pos_attr);
-	glf->glVertexAttribPointer(col_attr, 3, GL_FLOAT, GL_FALSE, 6 * sizeof (GLfloat),
-						  (const void *) (3 * sizeof (GLfloat)));
-	glf->glEnableVertexAttribArray(col_attr);
-
-	glf->glBindVertexArray(0);
+	vao.create();
+	{QOpenGLVertexArrayObject::Binder binder(&vao);
+		buffer.create();
+		buffer.bind();
+		buffer.setUsagePattern(QOpenGLBuffer::StreamDraw);
+		buffer.allocate(verts, nverts * 6 * sizeof (GLfloat));
+		delete[] verts;
+		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));
+		program.enableAttributeArray("col");
+	}
 }
 
 
 MeshView::~MeshView() {
-	glf->glDeleteVertexArrays(1, &vao);
-	glf->glDeleteBuffers(1, &vbo);
+	vao.destroy();
+	buffer.destroy();
 }
 
 
-void MeshView::paint(QOpenGLContext *ctx,
-					 int model_attr, int wireframe_attr) const {
+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");
 
-	glf->glUniformMatrix4fv(model_attr, 1, GL_FALSE,
-							mesh.transform.constData());
+	program.setUniformValue("model", mesh.transform);
 
-	/* Mesh */
-	glf->glBindVertexArray(vao);
-	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);
-	glf->glDisable(GL_POLYGON_OFFSET_FILL);
+	{QOpenGLVertexArrayObject::Binder binder(&vao);
+		/* Mesh */
+		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);
+		glf->glDisable(GL_POLYGON_OFFSET_FILL);
 
-	/* Wireframe */
-	glf->glUniform1f(wireframe_attr, 1);
-	glf->glDrawArrays(GL_TRIANGLES, 0, nverts);
-	if (glPolygonMode) glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-	glf->glLineWidth(3);
-	glf->glUniform1f(wireframe_attr, 0);
+		/* 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);
+	}
 }
diff --git a/src/mesh_view.h b/src/mesh_view.h
index ddd8e8e..47000c1 100644
--- a/src/mesh_view.h
+++ b/src/mesh_view.h
@@ -3,23 +3,22 @@
 
 #include "my_mesh.h"
 #include <QOpenGLExtraFunctions>
-#include <QOpenGLContext>
+#include <QOpenGLShaderProgram>
+#include <QOpenGLVertexArrayObject>
+#include <QOpenGLBuffer>
 
 
 class MeshView {
-	GLuint vao;
-	GLuint vbo;
+	QOpenGLVertexArrayObject vao;
+	QOpenGLBuffer buffer;
 	size_t nverts;
-	QOpenGLExtraFunctions *glf;
 
 public:
 	const MyMesh &mesh;
 
-	MeshView(QOpenGLExtraFunctions *glf, const MyMesh &mesh,
-			 int pos_attr, int col_attr);
+	MeshView(const MyMesh &mesh, QOpenGLShaderProgram &program);
 	~MeshView();
-	void paint(QOpenGLContext *ctx,
-			   int model_attr, int wireframe_attr) const;
+	void paint(QOpenGLShaderProgram &program);
 };
 
 
diff --git a/src/mesh_viewer.cpp b/src/mesh_viewer.cpp
index 60128b8..c5f1f37 100644
--- a/src/mesh_viewer.cpp
+++ b/src/mesh_viewer.cpp
@@ -1,40 +1,9 @@
 #include "mesh_viewer.h"
 
 #include <tgmath.h>
-#include <algorithm>
-
-
-const GLchar *vertex_shader_source = R"glsl(
-attribute vec3 pos;
-attribute vec3 col;
-
-varying vec3 frag_col;
-
-uniform mat4 proj;
-uniform mat4 view;
-uniform mat4 model;
-
-void main() {
-	gl_Position = proj * view * model * vec4(pos, 1.0);
-	frag_col = col;
-}
-)glsl";
-
-const GLchar *fragment_shader_source = R"glsl(
-varying vec3 frag_col;
-
-uniform vec3 wf_col;
-uniform bool wireframe;
-uniform float alpha;
-
-void main() {
-	if (!wireframe)
-		// gl_FragColor = vec4(wf_col, alpha);
-		gl_FragColor = vec4(.5, .5, .5, 1);
-	else
-		gl_FragColor = vec4(frag_col, alpha);
-}
-)glsl";
+#include <QOpenGLShader>
+#include <QOpenGLDebugLogger>
+#include <QtGlobal>
 
 
 MeshViewer::MeshViewer(QWidget *parent) : QOpenGLWidget(parent) {
@@ -48,96 +17,49 @@ QSize MeshViewer::sizeHint() const {
 }
 
 
-void GLAPIENTRY
-opengl_debug_cb(GLenum source,
-				GLenum type,
-				GLuint id,
-				GLenum severity,
-				GLsizei length,
-				const GLchar* message,
-				const void* userParam) {
-	(void) source;
-	(void) type;
-	(void) id;
-	(void) severity;
-	(void) length;
-	(void) userParam;
-	qDebug() << "OpenGL debug output:" << message;
-}
-
-
 void MeshViewer::initializeGL() {
-	// initializeOpenGLFunctions();
+	QOpenGLFunctions *glf = context()->functions();
+#ifdef QT_DEBUG
+	QOpenGLDebugLogger *logger = new QOpenGLDebugLogger(this);
+	if (!logger->initialize()) {
+		qDebug("OpenGL debug output unavailable");
+	}
+	connect(logger, &QOpenGLDebugLogger::messageLogged,
+			[](const QOpenGLDebugMessage &message) {
+				qDebug() << "OpenGL: " << message.message();
+			});
+    logger->startLogging();
+#endif
 
-	qDebug("OpenGL version %d.%d",
-		   	context()->format().majorVersion(),
-			context()->format().minorVersion());
-
-	glEnable(GL_DEBUG_OUTPUT);
-	glDebugMessageCallback(opengl_debug_cb, 0);
-
-	/* Compile the vertex shader. */
-	GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
-	glShaderSource(vertex_shader, 1, &vertex_shader_source, NULL);
-	glCompileShader(vertex_shader);
-	GLint status;
-	glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &status);
-	if (status != GL_TRUE) {
-		char log[1024];
-		glGetShaderInfoLog(vertex_shader, sizeof log, NULL, log);
-		fprintf(stderr, "Failed to compile the vertex shader: %s\n", log);
-		exit(1);
+	QOpenGLShader vertex_shader(QOpenGLShader::Vertex);
+	if (!vertex_shader.compileSourceFile(":/shader.vert")) {
+		qCritical() << vertex_shader.log();
 	}
 
-	/* Compile the fragment shader. */
-	GLuint fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
-	glShaderSource(fragment_shader, 1, &fragment_shader_source, NULL);
-	glCompileShader(fragment_shader);
-	glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &status);
-	if (status != GL_TRUE) {
-		char log[1024];
-		glGetShaderInfoLog(fragment_shader, sizeof log, NULL, log);
-		fprintf(stderr, "Failed to compile the fragment shader: %s\n", log);
-		exit(1);
+	QOpenGLShader fragment_shader(QOpenGLShader::Fragment);
+	if (fragment_shader.compileSourceFile(":/shader.frag")) {
+		qCritical() << fragment_shader.log();
 	}
-
-	/* Link the shader program. */
-	GLuint shader_program = glCreateProgram();
-	glAttachShader(shader_program, vertex_shader);
-	glAttachShader(shader_program, fragment_shader);
-	glBindFragDataLocation(shader_program, 0, "out_color");
-	glLinkProgram(shader_program);
-	glGetProgramiv(shader_program, GL_LINK_STATUS, &status);
-	if (status != GL_TRUE) {
-		char log[1024];
-		glGetProgramInfoLog(shader_program, sizeof log, NULL, log);
-		fprintf(stderr, "Failed to link the shader program: %s\n", log);
-		exit(1);
+	if (!program.addShader(&vertex_shader)) {
+		qCritical() << program.log();
 	}
+	if (!program.addShader(&fragment_shader)) {
+		qCritical() << program.log();
+	}
+	if (!program.link()) {
+		qCritical() << program.log();
+	}
+	program.bind();
 
-	/* Use it. */
-	glUseProgram(shader_program);
+	program.setUniformValue("alpha", (GLfloat) 1);
+	program.setUniformValue("wf_col", WIREFRAME_COLOR);
 
-	/* Get the position attribute. */
-	pos_attr = glGetAttribLocation(shader_program, "pos");
-	col_attr = glGetAttribLocation(shader_program, "col");
+	glf->glClearColor(1, 1, 1, 0);
 
-	proj_attr = glGetUniformLocation(shader_program, "proj");
-	view_attr = glGetUniformLocation(shader_program, "view");
-	model_attr = glGetUniformLocation(shader_program, "model");
-	wf_col_attr = glGetUniformLocation(shader_program, "wf_col");
-	wireframe_attr = glGetUniformLocation(shader_program, "wireframe");
-	alpha_attr = glGetUniformLocation(shader_program, "alpha");
+	glf->glEnable(GL_DEPTH_TEST);
+	glf->glEnable(GL_MULTISAMPLE);
 
-	glUniform1f(alpha_attr, 1);
-	glUniform3f(wf_col_attr, WIREFRAME_COLOR);
-
-	glClearColor(1, 1, 1, 0);
-
-	glEnable(GL_DEPTH_TEST);
-	glEnable(GL_MULTISAMPLE);
-
-	qDebug("Mesh viewer initialized");
+	qDebug("Mesh viewer: initialization complete");
 	emit initialized();
 }
 
@@ -145,7 +67,7 @@ void MeshViewer::initializeGL() {
 void MeshViewer::resizeGL(int w, int h) {
 	QMatrix4x4 projection;
 	projection.perspective(FOV, (float) w/h, .01, 100);
-	glUniformMatrix4fv(proj_attr, 1, GL_FALSE, projection.data());
+	program.setUniformValue("proj", projection);
 }
 
 
@@ -154,17 +76,17 @@ void MeshViewer::paintGL() {
 	QMatrix4x4 trans;
 	trans.translate(0, 0, -cam_dist);
 	QMatrix4x4 view = trans * rot;
-	glUniformMatrix4fv(view_attr, 1, GL_FALSE, view.data());
-	for (const MeshView m : meshes) {
-		m.paint(context(), model_attr, wireframe_attr);
+	program.setUniformValue("view", view);
+	for (MeshView &m : meshes) {
+		m.paint(program);
 	}
 }
 
 
 void MeshViewer::addMesh(const MyMesh &mesh) {
+	Q_ASSERT(isValid());
 	makeCurrent();
-	meshes.emplace_back(context()->extraFunctions(), mesh,
-						pos_attr, col_attr);
+	meshes.emplace_back(mesh, program);
 	doneCurrent();
 	update();
 }
diff --git a/src/mesh_viewer.h b/src/mesh_viewer.h
index b2e9a76..3c7a94f 100644
--- a/src/mesh_viewer.h
+++ b/src/mesh_viewer.h
@@ -25,8 +25,7 @@ class MeshViewer : public QOpenGLWidget {
     Q_OBJECT
 
 	std::list<MeshView> meshes;
-	GLint pos_attr, col_attr, proj_attr, view_attr, model_attr;
-	GLint wf_col_attr, wireframe_attr, alpha_attr;
+	QOpenGLShaderProgram program;
 	QMatrix4x4 proj;
 	QMatrix4x4 rot, rot_start;
 	GLfloat cam_dist = 1;
diff --git a/src/shader.frag b/src/shader.frag
new file mode 100644
index 0000000..c14c16c
--- /dev/null
+++ b/src/shader.frag
@@ -0,0 +1,13 @@
+varying vec3 frag_col;
+
+uniform vec3 wf_col;
+uniform bool wireframe;
+uniform float alpha;
+
+void main() {
+	if (!wireframe)
+		// gl_FragColor = vec4(wf_col, alpha);
+		gl_FragColor = vec4(.5, .5, .5, 1);
+	else
+		gl_FragColor = vec4(frag_col, alpha);
+}
diff --git a/src/shader.vert b/src/shader.vert
new file mode 100644
index 0000000..e1a20e8
--- /dev/null
+++ b/src/shader.vert
@@ -0,0 +1,13 @@
+attribute vec3 pos;
+attribute vec3 col;
+
+varying vec3 frag_col;
+
+uniform mat4 proj;
+uniform mat4 view;
+uniform mat4 model;
+
+void main() {
+	gl_Position = proj * view * model * vec4(pos, 1.0);
+	frag_col = col;
+}
diff --git a/tp.pro b/tp.pro
index a4cc9e0..3ce6559 100644
--- a/tp.pro
+++ b/tp.pro
@@ -16,6 +16,8 @@ win32 {
     LIBS += $$PWD/libs/OpenMesh/libwin/OpenMeshCore.lib
 }
 
+RESOURCES = resources.qrc
+
 HEADERS += src/my_mesh.h
 HEADERS += src/main_window.h
 HEADERS += src/mesh_viewer.h