doc: mention also OpenGL version for optionally used extensions.

src/Magnum/AbstractObject.h

@@ -50,9 +50,9 @@ class MAGNUM_EXPORT AbstractObject {
          * @brief Max object label length
          *
          * The result is cached, repeated queries don't result in repeated
-         * OpenGL calls. If @extension{KHR,debug} desktop or ES extension is
-         * not available, returns `0`. Note that @extension2{EXT,debug_label}
-         * has no such limit.
+         * OpenGL calls. If OpenGL 4.3 is not supported and @extension{KHR,debug}
+         * desktop or ES extension is not available, returns `0`. Note that
+         * @extension2{EXT,debug_label} has no such limit.
          * @see @ref AbstractQuery::setLabel(), @ref AbstractShaderProgram::setLabel(),
          *      @ref AbstractTexture::setLabel(), @ref Buffer::setLabel(),
          *      @ref BufferTexture::setLabel(), @ref Framebuffer::setLabel(),

src/Magnum/AbstractShaderProgram.h

@@ -517,9 +517,9 @@ class MAGNUM_EXPORT AbstractShaderProgram: public AbstractObject {
          * @brief %Shader program label
          *
          * The result is *not* cached, repeated queries will result in repeated
-         * OpenGL calls. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function returns empty string.
+         * OpenGL calls. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function returns empty string.
          * @see @fn_gl{GetObjectLabel} with @def_gl{PROGRAM} or
          *      @fn_gl_extension2{GetObjectLabel,EXT,debug_label} with
          *      @def_gl{PROGRAM_OBJECT_EXT}
@@ -530,9 +530,9 @@ class MAGNUM_EXPORT AbstractShaderProgram: public AbstractObject {
          * @brief Set shader program label
          * @return Reference to self (for method chaining)
          *
-         * Default is empty string. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function does nothing.
+         * Default is empty string. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function does nothing.
          * @see @ref maxLabelLength(), @fn_gl{ObjectLabel} with
          *      @def_gl{PROGRAM} or @fn_gl_extension2{LabelObject,EXT,debug_label}
          *      with @def_gl{PROGRAM_OBJECT_EXT}

src/Magnum/AbstractTexture.h

@@ -83,8 +83,8 @@ You can use functions @ref Texture::invalidateImage() and
 @ref Texture::invalidateSubImage() "invalidateSubImage()" if you don't need
 texture data anymore to avoid unnecessary memory operations performed by OpenGL
 in order to preserve the data. If running on OpenGL ES or extension
-@extension{ARB,invalidate_subdata} is not available, these functions do
-nothing.
+@extension{ARB,invalidate_subdata} (part of OpenGL 4.3) is not available, these
+functions do nothing.
 
 @todo all texture [level] parameters, global texture parameters
 @todo Add glPixelStore encapsulation
@@ -180,9 +180,9 @@ class MAGNUM_EXPORT AbstractTexture: public AbstractObject {
          * @brief %Texture label
          *
          * The result is *not* cached, repeated queries will result in repeated
-         * OpenGL calls. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function returns empty string.
+         * OpenGL calls. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function returns empty string.
          * @see @fn_gl{GetObjectLabel} or
          *      @fn_gl_extension2{GetObjectLabel,EXT,debug_label} with
          *      @def_gl{TEXTURE}
@@ -193,9 +193,9 @@ class MAGNUM_EXPORT AbstractTexture: public AbstractObject {
          * @brief Set texture label
          * @return Reference to self (for method chaining)
          *
-         * Default is empty string. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function does nothing.
+         * Default is empty string. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function does nothing.
          * @see @ref maxLabelLength(), @fn_gl{ObjectLabel} or
          *      @fn_gl_extension2{LabelObject,EXT,debug_label} with
          *      @def_gl{TEXTURE}

src/Magnum/Buffer.h

@@ -185,8 +185,8 @@ and @ref unmap() use DSA functions to avoid unnecessary calls to
 You can use functions @ref invalidateData() and @ref invalidateSubData() if you
 don't need buffer data anymore to avoid unnecessary memory operations performed
 by OpenGL in order to preserve the data. If running on OpenGL ES or extension
-@extension{ARB,invalidate_subdata} is not available, these functions do
-nothing.
+@extension{ARB,invalidate_subdata} (part of OpenGL 4.3) is not available, these
+functions do nothing.
  */
 class MAGNUM_EXPORT Buffer: public AbstractObject {
     friend struct Implementation::BufferState;
@@ -544,9 +544,9 @@ class MAGNUM_EXPORT Buffer: public AbstractObject {
          * @brief %Buffer label
          *
          * The result is *not* cached, repeated queries will result in repeated
-         * OpenGL calls. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function returns empty string.
+         * OpenGL calls. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function returns empty string.
          * @see @fn_gl{GetObjectLabel} with @def_gl{BUFFER} or
          *      @fn_gl_extension2{GetObjectLabel,EXT,debug_label} with
          *      @def_gl{BUFFER_OBJECT_EXT}
@@ -557,9 +557,9 @@ class MAGNUM_EXPORT Buffer: public AbstractObject {
          * @brief Set buffer label
          * @return Reference to self (for method chaining)
          *
-         * Default is empty string. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function does nothing.
+         * Default is empty string. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function does nothing.
          * @see @ref maxLabelLength(), @fn_gl{ObjectLabel} with @def_gl{BUFFER}
          *      or @fn_gl_extension2{LabelObject,EXT,debug_label} with
          *      @def_gl{BUFFER_OBJECT_EXT}

src/Magnum/Framebuffer.h

@@ -333,9 +333,9 @@ class MAGNUM_EXPORT Framebuffer: public AbstractFramebuffer, public AbstractObje
          * @brief %Framebuffer label
          *
          * The result is *not* cached, repeated queries will result in repeated
-         * OpenGL calls. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function returns empty string.
+         * OpenGL calls. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function returns empty string.
          * @see @fn_gl{GetObjectLabel} or
          *      @fn_gl_extension2{GetObjectLabel,EXT,debug_label} with
          *      @def_gl{FRAMEBUFFER}
@@ -346,9 +346,9 @@ class MAGNUM_EXPORT Framebuffer: public AbstractFramebuffer, public AbstractObje
          * @brief Set framebuffer label
          * @return Reference to self (for method chaining)
          *
-         * Default is empty string. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function does nothing.
+         * Default is empty string. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function does nothing.
          * @see @ref maxLabelLength(), @fn_gl{ObjectLabel} or
          *      @fn_gl_extension2{LabelObject,EXT,debug_label} with
          *      @def_gl{FRAMEBUFFER}

src/Magnum/Mesh.h

@@ -426,9 +426,9 @@ class MAGNUM_EXPORT Mesh: public AbstractObject {
          * @brief %Mesh label
          *
          * The result is *not* cached, repeated queries will result in repeated
-         * OpenGL calls. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function returns empty string.
+         * OpenGL calls. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function returns empty string.
          * @see @fn_gl{GetObjectLabel} with @def_gl{VERTEX_ARRAY} or
          *      @fn_gl_extension2{GetObjectLabel,EXT,debug_label} with
          *      @def_gl{VERTEX_ARRAY_OBJECT_EXT}
@@ -439,9 +439,9 @@ class MAGNUM_EXPORT Mesh: public AbstractObject {
          * @brief Set mesh label
          * @return Reference to self (for method chaining)
          *
-         * Default is empty string. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function does nothing.
+         * Default is empty string. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function does nothing.
          * @see @ref maxLabelLength(), @fn_gl{ObjectLabel} with
          *      @def_gl{VERTEX_ARRAY} or @fn_gl_extension2{LabelObject,EXT,debug_label}
          *      with @def_gl{VERTEX_ARRAY_OBJECT_EXT}

src/Magnum/Query.h

@@ -64,9 +64,9 @@ class MAGNUM_EXPORT AbstractQuery: public AbstractObject {
          * @brief %Query label
          *
          * The result is *not* cached, repeated queries will result in repeated
-         * OpenGL calls. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function returns empty string.
+         * OpenGL calls. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function returns empty string.
          * @see @fn_gl{GetObjectLabel} with @def_gl{QUERY} or
          *      @fn_gl_extension2{GetObjectLabel,EXT,debug_label} with
          *      @def_gl{QUERY_OBJECT_EXT}
@@ -77,9 +77,9 @@ class MAGNUM_EXPORT AbstractQuery: public AbstractObject {
          * @brief Set query label
          * @return Reference to self (for method chaining)
          *
-         * Default is empty string. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function does nothing.
+         * Default is empty string. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function does nothing.
          * @see @ref maxLabelLength(), @fn_gl{ObjectLabel} with
          *      @def_gl{QUERY} or @fn_gl_extension2{LabelObject,EXT,debug_label}
          *      with @def_gl{QUERY_OBJECT_EXT}

src/Magnum/RectangleTexture.h

@@ -166,10 +166,10 @@ class RectangleTexture: public AbstractTexture {
          * allowed.
          *
          * If @extension{EXT,direct_state_access} is not available, the texture
-         * is bound to some layer before the operation. If OpenGL 4.2,
-         * @extension{ARB,texture_storage}, OpenGL ES 3.0 or
-         * @es_extension{EXT,texture_storage} in OpenGL ES 2.0 is not
-         * available, the feature is emulated with @ref setImage() call.
+         * is bound to some layer before the operation. If @extension{ARB,texture_storage}
+         * (part of OpenGL 4.2), OpenGL ES 3.0 or @es_extension{EXT,texture_storage}
+         * in OpenGL ES 2.0 is not available, the feature is emulated with
+         * @ref setImage() call.
          * @see @fn_gl{ActiveTexture}, @fn_gl{BindTexture} and @fn_gl{TexStorage2D}
          *      or @fn_gl_extension{TextureStorage2D,EXT,direct_state_access},
          *      eventually @fn_gl{TexImage2D} or

src/Magnum/Renderbuffer.h

@@ -115,9 +115,9 @@ class MAGNUM_EXPORT Renderbuffer: public AbstractObject {
          * @brief %Renderbuffer label
          *
          * The result is *not* cached, repeated queries will result in repeated
-         * OpenGL calls. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function returns empty string.
+         * OpenGL calls. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function returns empty string.
          * @see @fn_gl{GetObjectLabel} or
          *      @fn_gl_extension2{GetObjectLabel,EXT,debug_label} with
          *      @def_gl{RENDERBUFFER}
@@ -128,9 +128,9 @@ class MAGNUM_EXPORT Renderbuffer: public AbstractObject {
          * @brief Set renderbuffer label
          * @return Reference to self (for method chaining)
          *
-         * Default is empty string. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function does nothing.
+         * Default is empty string. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function does nothing.
          * @see @ref maxLabelLength(), @fn_gl{ObjectLabel} or
          *      @fn_gl_extension2{LabelObject,EXT,debug_label} with
          *      @def_gl{RENDERBUFFER}

src/Magnum/Shader.h

@@ -471,9 +471,9 @@ class MAGNUM_EXPORT Shader: public AbstractObject {
          * @brief %Shader label
          *
          * The result is *not* cached, repeated queries will result in repeated
-         * OpenGL calls. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function returns empty string.
+         * OpenGL calls. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function returns empty string.
          * @see @fn_gl{GetObjectLabel} with @def_gl{SHADER} or
          *      @fn_gl_extension2{GetObjectLabel,EXT,debug_label} with
          *      @def_gl{SHADER_OBJECT_EXT}
@@ -484,9 +484,9 @@ class MAGNUM_EXPORT Shader: public AbstractObject {
          * @brief Set shader label
          * @return Reference to self (for method chaining)
          *
-         * Default is empty string. If neither @extension{KHR,debug} nor
-         * @extension2{EXT,debug_label} desktop or ES extension is available,
-         * this function does nothing.
+         * Default is empty string. If OpenGL 4.3 is not supported and neither
+         * @extension{KHR,debug} nor @extension2{EXT,debug_label} desktop or ES
+         * extension is available, this function does nothing.
          * @see @ref maxLabelLength(), @fn_gl{ObjectLabel} with
          *      @def_gl{SHADER} or @fn_gl_extension2{LabelObject,EXT,debug_label}
          *      with @def_gl{SHADER_OBJECT_EXT}

src/Magnum/Texture.h

@@ -296,11 +296,10 @@ template<UnsignedInt dimensions> class Texture: public AbstractTexture {
          * allowed.
          *
          * If @extension{EXT,direct_state_access} is not available, the texture
-         * is bound to some layer before the operation. If OpenGL 4.2,
-         * @extension{ARB,texture_storage}, OpenGL ES 3.0 or
-         * @es_extension{EXT,texture_storage} in OpenGL ES 2.0 is not
-         * available, the feature is emulated with sequence of @ref setImage()
-         * calls.
+         * is bound to some layer before the operation. If @extension{ARB,texture_storage}
+         * (part of OpenGL 4.2), OpenGL ES 3.0 or @es_extension{EXT,texture_storage}
+         * in OpenGL ES 2.0 is not available, the feature is emulated with
+         * sequence of @ref setImage() calls.
          * @see @fn_gl{ActiveTexture}, @fn_gl{BindTexture} and
          *      @fn_gl{TexStorage1D}/@fn_gl{TexStorage2D}/@fn_gl{TexStorage3D}
          *      or @fn_gl_extension{TextureStorage1D,EXT,direct_state_access}/