GL: put branch contents on a new line.

So line code coverage reports which branches weren't taken by tests.
Other libraries need similar treatment but there's too many cases to fix
so I'm doing it just here for now.

src/Magnum/GL/AbstractFramebuffer.cpp

@@ -105,7 +105,8 @@ Int AbstractFramebuffer::maxDualSourceDrawBuffers() {
 
 #ifndef MAGNUM_TARGET_WEBGL
 void AbstractFramebuffer::createIfNotAlready() {
-    if(_flags & ObjectFlag::Created) return;
+    if(_flags & ObjectFlag::Created)
+        return;
 
     /* glGen*() does not create the object, just reserves the name. Some
        commands (such as glObjectLabel()) operate with IDs directly and they
@@ -146,7 +147,8 @@ void AbstractFramebuffer::bindInternal(FramebufferTarget target) {
 void AbstractFramebuffer::bindImplementationSingle(AbstractFramebuffer& self, FramebufferTarget) {
     Implementation::FramebufferState& state = Context::current().state().framebuffer;
     CORRADE_INTERNAL_ASSERT(state.readBinding == state.drawBinding);
-    if(state.readBinding == self._id) return;
+    if(state.readBinding == self._id)
+        return;
 
     state.readBinding = state.drawBinding = self._id;
 
@@ -163,10 +165,12 @@ void AbstractFramebuffer::bindImplementationDefault(AbstractFramebuffer& self, F
     Implementation::FramebufferState& state = Context::current().state().framebuffer;
 
     if(target == FramebufferTarget::Read) {
-        if(state.readBinding == self._id) return;
+        if(state.readBinding == self._id)
+            return;
         state.readBinding = self._id;
     } else if(target == FramebufferTarget::Draw) {
-        if(state.drawBinding == self._id) return;
+        if(state.drawBinding == self._id)
+            return;
         state.drawBinding = self._id;
     } else CORRADE_INTERNAL_ASSERT_UNREACHABLE(); /* LCOV_EXCL_LINE */
 

src/Magnum/GL/AbstractQuery.cpp

@@ -46,7 +46,8 @@ AbstractQuery::AbstractQuery(GLenum target): _target{target}, _flags{ObjectFlag:
 
 AbstractQuery::~AbstractQuery() {
     /* Moved out or not deleting on destruction, nothing to do */
-    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction)) return;
+    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction))
+        return;
 
     #ifndef MAGNUM_TARGET_GLES2
     glDeleteQueries(1, &_id);

src/Magnum/GL/AbstractShaderProgram.cpp

@@ -307,7 +307,8 @@ AbstractShaderProgram::AbstractShaderProgram(AbstractShaderProgram&& other) noex
 }
 
 AbstractShaderProgram::~AbstractShaderProgram() {
-    if(!_id) return;
+    if(!_id)
+        return;
 
     /* Remove current usage from the state */
     GLuint& current = Context::current().state().shaderProgram.current;
@@ -370,7 +371,8 @@ AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh) {
     CORRADE_ASSERT(mesh._countSet, "GL::AbstractShaderProgram::draw(): Mesh::setCount() was never called, probably a mistake?", *this);
 
     /* Nothing to draw, exit without touching any state */
-    if(!mesh._count || !mesh._instanceCount) return *this;
+    if(!mesh._count || !mesh._instanceCount)
+        return *this;
 
     use();
 
@@ -386,7 +388,8 @@ AbstractShaderProgram& AbstractShaderProgram::draw(MeshView& mesh) {
     CORRADE_ASSERT(mesh._countSet, "GL::AbstractShaderProgram::draw(): MeshView::setCount() was never called, probably a mistake?", *this);
 
     /* Nothing to draw, exit without touching any state */
-    if(!mesh._count || !mesh._instanceCount) return *this;
+    if(!mesh._count || !mesh._instanceCount)
+        return *this;
 
     use();
 
@@ -399,7 +402,8 @@ AbstractShaderProgram& AbstractShaderProgram::draw(MeshView& mesh) {
 }
 
 AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers::StridedArrayView1D<const UnsignedInt>& counts, const Containers::StridedArrayView1D<const UnsignedInt>& vertexOffsets, const Containers::StridedArrayView1D<const UnsignedInt>& indexOffsets) {
-    if(!counts.size()) return *this;
+    if(!counts.size())
+        return *this;
 
     use();
 
@@ -409,7 +413,8 @@ AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers:
 
 #ifndef CORRADE_TARGET_32BIT
 AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers::StridedArrayView1D<const UnsignedInt>& counts, const Containers::StridedArrayView1D<const UnsignedInt>& vertexOffsets, const Containers::StridedArrayView1D<const UnsignedLong>& indexOffsets) {
-    if(!counts.size()) return *this;
+    if(!counts.size())
+        return *this;
 
     use();
 
@@ -425,7 +430,8 @@ AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers:
 #ifdef MAGNUM_TARGET_GLES
 #ifndef MAGNUM_TARGET_GLES2
 AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers::StridedArrayView1D<const UnsignedInt>& counts, const Containers::StridedArrayView1D<const UnsignedInt>& instanceCounts, const Containers::StridedArrayView1D<const UnsignedInt>& vertexOffsets, const Containers::StridedArrayView1D<const UnsignedInt>& indexOffsets, const Containers::StridedArrayView1D<const UnsignedInt>& instanceOffsets) {
-    if(!counts.size()) return *this;
+    if(!counts.size())
+        return *this;
 
     use();
 
@@ -435,7 +441,8 @@ AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers:
 
 #ifndef CORRADE_TARGET_32BIT
 AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers::StridedArrayView1D<const UnsignedInt>& counts, const Containers::StridedArrayView1D<const UnsignedInt>& instanceCounts, const Containers::StridedArrayView1D<const UnsignedInt>& vertexOffsets, const Containers::StridedArrayView1D<const UnsignedLong>& indexOffsets, const Containers::StridedArrayView1D<const UnsignedInt>& instanceOffsets) {
-    if(!counts.size()) return *this;
+    if(!counts.size())
+        return *this;
 
     use();
 
@@ -450,7 +457,8 @@ AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers:
 #endif
 
 AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers::StridedArrayView1D<const UnsignedInt>& counts, const Containers::StridedArrayView1D<const UnsignedInt>& instanceCounts, const Containers::StridedArrayView1D<const UnsignedInt>& vertexOffsets, const Containers::StridedArrayView1D<const UnsignedInt>& indexOffsets) {
-    if(!counts.size()) return *this;
+    if(!counts.size())
+        return *this;
 
     use();
 
@@ -464,7 +472,8 @@ AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers:
 
 #ifndef CORRADE_TARGET_32BIT
 AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers::StridedArrayView1D<const UnsignedInt>& counts, const Containers::StridedArrayView1D<const UnsignedInt>& instanceCounts, const Containers::StridedArrayView1D<const UnsignedInt>& vertexOffsets, const Containers::StridedArrayView1D<const UnsignedLong>& indexOffsets) {
-    if(!counts.size()) return *this;
+    if(!counts.size())
+        return *this;
 
     use();
 
@@ -483,7 +492,8 @@ AbstractShaderProgram& AbstractShaderProgram::draw(Mesh& mesh, const Containers:
 #endif
 
 AbstractShaderProgram& AbstractShaderProgram::draw(const Containers::Iterable<MeshView>& meshes) {
-    if(meshes.isEmpty()) return *this;
+    if(meshes.isEmpty())
+        return *this;
 
     use();
 
@@ -504,7 +514,8 @@ AbstractShaderProgram& AbstractShaderProgram::draw(const Containers::Iterable<Me
 #ifndef MAGNUM_TARGET_GLES
 AbstractShaderProgram& AbstractShaderProgram::drawTransformFeedback(Mesh& mesh, TransformFeedback& xfb, UnsignedInt stream) {
     /* Nothing to draw, exit without touching any state */
-    if(!mesh._instanceCount) return *this;
+    if(!mesh._instanceCount)
+        return *this;
 
     use();
     mesh.drawInternal(xfb, stream, mesh._instanceCount);
@@ -513,7 +524,8 @@ AbstractShaderProgram& AbstractShaderProgram::drawTransformFeedback(Mesh& mesh,
 
 AbstractShaderProgram& AbstractShaderProgram::drawTransformFeedback(MeshView& mesh, TransformFeedback& xfb, UnsignedInt stream) {
     /* If nothing to draw, exit without touching any state */
-    if(mesh._instanceCount) return *this;
+    if(mesh._instanceCount)
+        return *this;
 
     use();
     mesh._original->drawInternal(xfb, stream, mesh._instanceCount);
@@ -524,7 +536,8 @@ AbstractShaderProgram& AbstractShaderProgram::drawTransformFeedback(MeshView& me
 #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
 AbstractShaderProgram& AbstractShaderProgram::dispatchCompute(const Vector3ui& workgroupCount) {
     /* Nothing to dispatch, exit without touching any state */
-    if(!workgroupCount.product()) return *this;
+    if(!workgroupCount.product())
+        return *this;
 
     use();
     glDispatchCompute(workgroupCount.x(), workgroupCount.y(), workgroupCount.z());
@@ -633,7 +646,8 @@ bool AbstractShaderProgram::checkLink(const Containers::Iterable<Shader>& shader
        The checkCompile() API is called always, to print also compilation
        warnings even in case everything still manages to link well. */
     for(Shader& shader: shaders)
-        if(!shader.checkCompile()) return false;
+        if(!shader.checkCompile())
+            return false;
 
     GLint success, logLength;
     glGetProgramiv(_id, GL_LINK_STATUS, &success);

src/Magnum/GL/AbstractTexture.cpp

@@ -122,7 +122,8 @@ void AbstractTexture::unbind(const Int textureUnit) {
     Implementation::TextureState& textureState = Context::current().state().texture;
 
     /* If given texture unit is already unbound, nothing to do */
-    if(textureState.bindings[textureUnit].second() == 0) return;
+    if(textureState.bindings[textureUnit].second() == 0)
+        return;
 
     /* Unbind the texture, reset state tracker */
     Context::current().state().texture.unbindImplementation(textureUnit);
@@ -233,7 +234,8 @@ void AbstractTexture::createImplementationDSA(AbstractTexture& self) {
 
 AbstractTexture::~AbstractTexture() {
     /* Moved out or not deleting on destruction, nothing to do */
-    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction)) return;
+    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction))
+        return;
 
     /* Remove all bindings */
     for(auto& binding: Context::current().state().texture.bindings) {
@@ -254,7 +256,8 @@ AbstractTexture::~AbstractTexture() {
 
 #ifndef MAGNUM_TARGET_WEBGL
 void AbstractTexture::createIfNotAlready() {
-    if(_flags & ObjectFlag::Created) return;
+    if(_flags & ObjectFlag::Created)
+        return;
 
     /* glGen*() does not create the object, just reserves the name. Some
        commands (such as glBindTextures() or glObjectLabel()) operate with IDs
@@ -293,7 +296,8 @@ void AbstractTexture::unbindImage(const Int imageUnit) {
     Implementation::TextureState& textureState = Context::current().state().texture;
 
     /* If already unbound in given image unit, nothing to do */
-    if(textureState.imageBindings[imageUnit].id == 0) return;
+    if(textureState.imageBindings[imageUnit].id == 0)
+        return;
 
     /* Update state tracker, bind the texture to the unit */
     textureState.imageBindings[imageUnit].id = 0;
@@ -343,7 +347,8 @@ void AbstractTexture::bindImageInternal(const Int imageUnit, const Int level, co
     const Implementation::TextureState::ImageBinding state{_id, level, layered, layer, GLenum(access)};
 
     /* If already bound in given texture unit, nothing to do */
-    if(textureState.imageBindings[imageUnit] == state) return;
+    if(textureState.imageBindings[imageUnit] == state)
+        return;
 
     /* Update state tracker, bind the texture to the unit */
     textureState.imageBindings[imageUnit] = state;
@@ -355,7 +360,8 @@ void AbstractTexture::bind(Int textureUnit) {
     Implementation::TextureState& textureState = Context::current().state().texture;
 
     /* If already bound in given texture unit, nothing to do */
-    if(textureState.bindings[textureUnit].second() == _id) return;
+    if(textureState.bindings[textureUnit].second() == _id)
+        return;
 
     /* Bind the texture to the unit, *then* update the state tracker. The order
        is important, as if bindImplementationMulti() is used, it calls into
@@ -571,7 +577,8 @@ void AbstractTexture::bindInternal() {
         glActiveTexture(GL_TEXTURE0 + (textureState.currentTextureUnit = internalTextureUnit));
 
     /* If already bound in given texture unit, nothing to do */
-    if(textureState.bindings[internalTextureUnit].second() == _id) return;
+    if(textureState.bindings[internalTextureUnit].second() == _id)
+        return;
 
     /* Update state tracker, bind the texture to the unit. Not directly calling
        glBindTexture() here because we may need to include various

src/Magnum/GL/Buffer.cpp

@@ -202,7 +202,8 @@ void Buffer::createImplementationDSA(Buffer& self) {
 
 Buffer::~Buffer() {
     /* Moved out or not deleting on destruction, nothing to do */
-    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction)) return;
+    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction))
+        return;
 
     GLuint* bindings = Context::current().state().buffer.bindings;
 
@@ -232,7 +233,8 @@ void Buffer::setTargetHintImplementationSwiftShader(Buffer& self, const TargetHi
 
 #ifndef MAGNUM_TARGET_WEBGL
 void Buffer::createIfNotAlready() {
-    if(_flags & ObjectFlag::Created) return;
+    if(_flags & ObjectFlag::Created)
+        return;
 
     /* glGen*() does not create the object, just reserves the name. Some
        commands (such as glInvalidateBufferData() or glObjectLabel()) operate
@@ -280,7 +282,8 @@ void Buffer::bindInternal(const TargetHint target, Buffer* const buffer) {
     GLuint& bound = Context::current().state().buffer.bindings[Implementation::BufferState::indexForTarget(target)];
 
     /* Already bound, nothing to do */
-    if(bound == id) return;
+    if(bound == id)
+        return;
 
     /* Bind the buffer otherwise, which will also finally create it */
     bound = id;
@@ -293,12 +296,14 @@ auto Buffer::bindSomewhereInternal(const TargetHint hint) -> TargetHint {
     GLuint& hintBinding = bindings[Implementation::BufferState::indexForTarget(hint)];
 
     /* Shortcut - if already bound to hint, return */
-    if(hintBinding == _id) return hint;
+    if(hintBinding == _id)
+        return hint;
 
     /* Return first target in which the buffer is bound */
     /** @todo wtf there is one more? */
     for(std::size_t i = 1; i != Implementation::BufferState::TargetCount; ++i)
-        if(bindings[i] == _id) return Implementation::BufferState::targetForIndex[i-1];
+        if(bindings[i] == _id)
+            return Implementation::BufferState::targetForIndex[i-1];
 
     /* Sorry, this is ugly because GL is also ugly. Blame GL, not me.
 
@@ -651,7 +656,8 @@ void Buffer::textureWorkaroundAppleBefore() {
        pretty significant overhead. Skipping the whole thing if no buffer
        texture is known to be bound. */
     Implementation::TextureState& textureState = Context::current().state().texture;
-    if(textureState.bufferTextureBound.none()) return;
+    if(textureState.bufferTextureBound.none())
+        return;
     for(GLint textureUnit = 0; textureUnit != GLint(textureState.bindings.size()); ++textureUnit) {
         /* Checking just
             textureState.bindings[textureUnit].first != GL_TEXTURE_BUFFER
@@ -659,7 +665,8 @@ void Buffer::textureWorkaroundAppleBefore() {
            the same texture unit. Magnum's state tracker ignores that (as it
            would mean having to maintain a state cache of 128 units times 12
            targets) and so this state is tracked separately. */
-        if(!textureState.bufferTextureBound[textureUnit]) continue;
+        if(!textureState.bufferTextureBound[textureUnit])
+            continue;
 
         /* Activate given texture unit if not already active, update state
            tracker */

src/Magnum/GL/Context.cpp

@@ -1220,7 +1220,8 @@ bool Context::isVersionSupported(Version version) const {
 
 Version Context::supportedVersion(std::initializer_list<Version> versions) const {
     for(auto version: versions)
-        if(isVersionSupported(version)) return version;
+        if(isVersionSupported(version))
+            return version;
 
     #ifndef MAGNUM_TARGET_GLES
     return Version::GL210;

src/Magnum/GL/Framebuffer.cpp

@@ -125,7 +125,8 @@ void Framebuffer::createImplementationDSA(Framebuffer& self) {
 
 Framebuffer::~Framebuffer() {
     /* Moved out or not deleting on destruction, nothing to do */
-    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction)) return;
+    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction))
+        return;
 
     /* If bound, remove itself from state */
     Context& context = Context::current();

src/Magnum/GL/Implementation/driverSpecific.cpp

@@ -518,14 +518,16 @@ constexpr Containers::StringView KnownWorkarounds[]{
    bother with some binary search, which needs extra testing effort. */
 Containers::StringView findWorkaround(Containers::StringView workaround) {
     for(Containers::StringView i: KnownWorkarounds)
-        if(workaround == i) return i;
+        if(workaround == i)
+            return i;
     return {};
 }
 
 }
 
 auto Context::detectedDriver() -> DetectedDrivers {
-    if(_detectedDrivers) return *_detectedDrivers;
+    if(_detectedDrivers)
+        return *_detectedDrivers;
 
     _detectedDrivers = DetectedDrivers{};
 
@@ -681,7 +683,8 @@ bool Context::isDriverWorkaroundDisabled(const Containers::StringView workaround
        compare just data pointers instead of the whole string as we store only
        the views in the KnownWorkarounds list. */
     for(const auto& i: _driverWorkarounds)
-        if(i.first().data() == found.data()) return i.second();
+        if(i.first().data() == found.data())
+            return i.second();
     arrayAppend(_driverWorkarounds, InPlaceInit, found, false);
     return false;
 }
@@ -717,7 +720,8 @@ void Context::setupDriverWorkarounds() {
         #endif
         const Int firefoxVersion = EM_ASM_INT({
             var match = navigator.userAgent.match(/Firefox\\\\/(\\\\d+)/);
-            if(match) return match[1]|0; /* coerce to an int (remember asm.js?) */
+            if(match)
+                return match[1]|0; /* coerce to an int (remember asm.js?) */
             return 0;
         });
         #pragma GCC diagnostic pop

src/Magnum/GL/Mesh.cpp

@@ -205,7 +205,8 @@ struct Mesh::AttributeLayout {
     GLint size() const {
         const GLint size = kindSize >> 2;
         #ifndef MAGNUM_TARGET_GLES
-        if(!size) return GL_BGRA;
+        if(!size)
+            return GL_BGRA;
         #endif
         return size;
     }
@@ -394,7 +395,8 @@ Mesh::Mesh(const GLuint id, const MeshPrimitive primitive, const ObjectFlags fla
 #ifndef MAGNUM_TARGET_WEBGL
 inline void Mesh::createIfNotAlready() {
     /* If VAO extension is not available, the following is always true */
-    if(_flags & ObjectFlag::Created) return;
+    if(_flags & ObjectFlag::Created)
+        return;
 
     /* glGen*() does not create the object, just reserves the name. Some
        commands (such as glObjectLabel()) operate with IDs directly and they

src/Magnum/GL/MeshView.cpp

@@ -130,7 +130,8 @@ void MeshView::multiDrawImplementationDefault(const Containers::Iterable<MeshVie
 void MeshView::multiDrawImplementationFallback(const Containers::Iterable<MeshView>& meshes) {
     for(MeshView& mesh: meshes) {
         /* Nothing to draw in this mesh */
-        if(!mesh._count) continue;
+        if(!mesh._count)
+            continue;
 
         CORRADE_ASSERT(mesh._instanceCount == 1, "GL::AbstractShaderProgram::draw(): cannot multi-draw instanced meshes", );
 

src/Magnum/GL/Renderbuffer.cpp

@@ -90,7 +90,8 @@ void Renderbuffer::createImplementationDSA(Renderbuffer& self) {
 
 Renderbuffer::~Renderbuffer() {
     /* Moved out, nothing to do */
-    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction)) return;
+    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction))
+        return;
 
     /* If bound, remove itself from state */
     GLuint& binding = Context::current().state().framebuffer.renderbufferBinding;
@@ -101,7 +102,8 @@ Renderbuffer::~Renderbuffer() {
 
 #ifndef MAGNUM_TARGET_WEBGL
 inline void Renderbuffer::createIfNotAlready() {
-    if(_flags & ObjectFlag::Created) return;
+    if(_flags & ObjectFlag::Created)
+        return;
 
     /* glGen*() does not create the object, just reserves the name. Some
        commands (such as glObjectLabel()) operate with IDs directly and they
@@ -147,8 +149,8 @@ void Renderbuffer::setStorageMultisample(const Int samples, const RenderbufferFo
 
 void Renderbuffer::bind() {
     GLuint& binding = Context::current().state().framebuffer.renderbufferBinding;
-
+    if(binding == _id)
-    if(binding == _id) return;
+        return;
 
     /* Binding the renderbuffer finally creates it */
     binding = _id;

src/Magnum/GL/Shader.cpp

@@ -769,7 +769,8 @@ Shader::Shader(Shader&& other) noexcept: _type{other._type}, _id{other._id}, _fl
 
 Shader::~Shader() {
     /* Moved out or not deleting on destruction, nothing to do */
-    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction)) return;
+    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction))
+        return;
 
     glDeleteShader(_id);
 }

src/Magnum/GL/Test/GlobalStateAcrossLibrariesLibrary.cpp

@@ -31,7 +31,8 @@
 namespace Magnum { namespace GL { namespace Test {
 
 GL::Context* currentContextInALibrary() {
-    if(!GL::Context::hasCurrent()) return nullptr;
+    if(!GL::Context::hasCurrent())
+        return nullptr;
     return &GL::Context::current();
 }
 

src/Magnum/GL/TransformFeedback.cpp

@@ -132,7 +132,8 @@ void TransformFeedback::createImplementationDSA(TransformFeedback& self) {
 
 TransformFeedback::~TransformFeedback() {
     /* Moved out or not deleting on destruction, nothing to do */
-    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction)) return;
+    if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction))
+        return;
 
     /* If bound, remove itself from state */
     GLuint& binding = Context::current().state().transformFeedback.binding;
@@ -145,7 +146,8 @@ void TransformFeedback::bindInternal() {
     GLuint& bound = Context::current().state().transformFeedback.binding;
 
     /* Already bound, nothing to do */
-    if(bound == _id) return;
+    if(bound == _id)
+        return;
 
     /* Bind the transform feedback otherwise, which will also finally create it */
     bound = _id;
@@ -155,7 +157,8 @@ void TransformFeedback::bindInternal() {
 
 #ifndef MAGNUM_TARGET_WEBGL
 inline void TransformFeedback::createIfNotAlready() {
-    if(_flags & ObjectFlag::Created) return;
+    if(_flags & ObjectFlag::Created)
+        return;
 
     /* glGen*() does not create the object, just reserves the name. Some
        commands (such as glObjectLabel()) operate with IDs directly and they