ARB_direct_state_access support for creating buffers.

src/Magnum/Buffer.cpp

@@ -162,16 +162,27 @@ void Buffer::copy(Buffer& read, Buffer& write, const GLintptr readOffset, const
 }
 #endif
 
-Buffer::Buffer(const TargetHint targetHint): _targetHint{targetHint},
+Buffer::Buffer(const TargetHint targetHint): _targetHint{targetHint}
     #ifdef CORRADE_TARGET_NACL
-    _mappedBuffer{nullptr},
+    , _mappedBuffer{nullptr}
     #endif
-    _created{false}
 {
-    glGenBuffers(1, &_id);
+    (this->*Context::current()->state().buffer->createImplementation)();
     CORRADE_INTERNAL_ASSERT(_id != Implementation::State::DisengagedBinding);
 }
 
+void Buffer::createImplementationDefault() {
+    glGenBuffers(1, &_id);
+    _created = false;
+}
+
+#ifndef MAGNUM_TARGET_GLES
+void Buffer::createImplementationDSA() {
+    glCreateBuffers(1, &_id);
+    _created = true;
+}
+#endif
+
 Buffer::~Buffer() {
     /* Moved out, nothing to do */
     if(!_id) return;

src/Magnum/Buffer.h

@@ -761,8 +761,10 @@ class MAGNUM_EXPORT Buffer: public AbstractObject {
          * @param targetHint    Target hint, see @ref setTargetHint() for more
          *      information
          *
-         * Creates new OpenGL buffer.
+         * Creates new OpenGL buffer object. If @extension{ARB,direct_state_access}
-         * @see @fn_gl{GenBuffers}
+         * (part of OpenGL 4.5) is not supported, the buffer is created on
+         * first use.
+         * @see @fn_gl{CreateBuffers}, eventually @fn_gl{GenBuffers}
          */
         explicit Buffer(TargetHint targetHint = TargetHint::Array);
 
@@ -784,7 +786,7 @@ class MAGNUM_EXPORT Buffer: public AbstractObject {
         /**
          * @brief Destructor
          *
-         * Deletes associated OpenGL buffer.
+         * Deletes associated OpenGL buffer object.
          * @see @fn_gl{DeleteBuffers}
          */
         ~Buffer();
@@ -1175,6 +1177,11 @@ class MAGNUM_EXPORT Buffer: public AbstractObject {
         #endif
         #endif
 
+        void MAGNUM_LOCAL createImplementationDefault();
+        #ifndef MAGNUM_TARGET_GLES
+        void MAGNUM_LOCAL createImplementationDSA();
+        #endif
+
         void MAGNUM_LOCAL createIfNotAlready();
 
         Buffer& setLabelInternal(Containers::ArrayReference<const char> label);

src/Magnum/Implementation/BufferState.cpp

@@ -86,6 +86,18 @@ BufferState::BufferState(Context& context, std::vector<std::string>& extensions)
     , maxAtomicCounterBindings{0}, maxShaderStorageBindings{0}, shaderStorageOffsetAlignment{0}, uniformOffsetAlignment{0}, maxUniformBindings{0}
     #endif
 {
+    /* Create implementation */
+    #ifndef MAGNUM_TARGET_GLES
+    if(context.isExtensionSupported<Extensions::GL::ARB::direct_state_access>()) {
+        extensions.push_back(Extensions::GL::ARB::direct_state_access::string());
+        createImplementation = &Buffer::createImplementationDSA;
+
+    } else
+    #endif
+    {
+        createImplementation = &Buffer::createImplementationDefault;
+    }
+
     #ifndef MAGNUM_TARGET_GLES
     if(context.isExtensionSupported<Extensions::GL::EXT::direct_state_access>()) {
         extensions.push_back(Extensions::GL::EXT::direct_state_access::string());

src/Magnum/Implementation/BufferState.h

@@ -51,6 +51,7 @@ struct BufferState {
     void(*bindRangesImplementation)(Buffer::Target, UnsignedInt, Containers::ArrayReference<const std::tuple<Buffer*, GLintptr, GLsizeiptr>>);
     void(*copyImplementation)(Buffer&, Buffer&, GLintptr, GLintptr, GLsizeiptr);
     #endif
+    void(Buffer::*createImplementation)();
     void(Buffer::*getParameterImplementation)(GLenum, GLint*);
     #ifndef MAGNUM_TARGET_GLES2
     void(Buffer::*getSubDataImplementation)(GLintptr, GLsizeiptr, GLvoid*);