doc: add a page aggregating WebGL-specific features.

The time have come to this. Sigh.

doc/Doxyfile

@@ -298,6 +298,7 @@ ALIASES                = \
     "requires_webgl20=@xrefitem requires-webgl20 \"Requires WebGL 2.0\" \"Functionality requiring WebGL 2.0\"" \
     "requires_webgl_extension=@xrefitem requires-webgl-extension \"Requires WebGL extension\" \"Functionality requiring specific WebGL extension\"" \
     "requires_gles20_only=@xrefitem requires-gles20-only \"OpenGL ES 2.0-only and WebGL 1.0-only\" \"OpenGL ES 2.0-only and WebGL 1.0-only functionality\"" \
+    "requires_webgl_only=@xrefitem requires-webgl-only \"WebGL-only\" \"WebGL-only functionality\"" \
     "webgl_extension{2}=<a href=\"https://www.khronos.org/registry/webgl/extensions/\1_\2/\">\1_\2</a>" \
     "fn_vk{1}=<a href=\"https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/vk\1.html\">vk\1()</a>" \
     "type_vk{1}=<a href=\"https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/Vk\1.html\">Vk\1</a>" \

doc/Doxyfile-mcss

@@ -55,6 +55,7 @@ ALIASES                = \
     "requires_webgl20=@xrefitem requires-webgl20 \"Requires WebGL 2.0\" \"Functionality requiring WebGL 2.0\"" \
     "requires_webgl_extension=@xrefitem requires-webgl-extension \"Requires WebGL extension\" \"Functionality requiring specific WebGL extension\"" \
     "requires_gles20_only=@xrefitem requires-gles20-only \"OpenGL ES 2.0-only and WebGL 1.0-only\" \"OpenGL ES 2.0-only and WebGL 1.0-only functionality\"" \
+    "requires_webgl_only=@xrefitem requires-webgl-only \"WebGL-only\" \"WebGL-only functionality\"" \
     "webgl_extension{2}=@m_class{m-doc-external} <a href=\"https://www.khronos.org/registry/webgl/extensions/\1_\2/\">\1_\2</a>" \
     "fn_vk{1}=@m_class{m-doc-external} <a href=\"https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/vk\1.html\">vk\1()</a>" \
     "type_vk{1}=@m_class{m-doc-external} <a href=\"https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/Vk\1.html\">Vk\1</a>" \

doc/Doxyfile-public

@@ -51,6 +51,7 @@ ALIASES                = \
     "requires_webgl20=@xrefitem requires-webgl20 \"Requires WebGL 2.0\" \"Functionality requiring WebGL 2.0\"" \
     "requires_webgl_extension=@xrefitem requires-webgl-extension \"Requires WebGL extension\" \"Functionality requiring specific WebGL extension\"" \
     "requires_gles20_only=@xrefitem requires-gles20-only \"OpenGL ES 2.0-only and WebGL 1.0-only\" \"OpenGL ES 2.0-only and WebGL 1.0-only functionality\"" \
+    "requires_webgl_only=@xrefitem requires-webgl-only \"WebGL-only\" \"WebGL-only functionality\"" \
     "webgl_extension{2}=@m_class{m-doc-external} <a href=\"https://www.khronos.org/registry/webgl/extensions/\1_\2/\">\1_\2</a>" \
     "fn_vk{1}=@m_class{m-doc-external} <a href=\"https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/vk\1.html\">vk\1()</a>" \
     "type_vk{1}=@m_class{m-doc-external} <a href=\"https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/Vk\1.html\">Vk\1</a>" \

doc/opengl.dox

@@ -82,6 +82,7 @@ is supported on older Intel GPUs even if they are capable of OpenGL 2.1 only).
 -   @subpage requires-webgl20
 -   @subpage requires-webgl-extension
 -   @subpage requires-gles20-only
+-   @subpage requires-webgl-only
 
 @see @ref building, @ref cmake, @ref MAGNUM_TARGET_GLES,
     @ref MAGNUM_TARGET_GLES2
@@ -170,7 +171,7 @@ The following symbols are not defined when targeting OpenGL ES 2.0.
 
 The following symbols are not defined when targeting WebGL.
 
-@see @ref MAGNUM_TARGET_WEBGL, @ref requires-gl
+@see @ref MAGNUM_TARGET_WEBGL, @ref requires-gl, @ref requires-webgl-only
 */
 
 /** @page requires-webgl20 Functionality requiring WebGL 2.0
@@ -187,5 +188,14 @@ The following symbols are not defined when targeting WebGL.
 The following symbols are not defined when targeting OpenGL ES 3.0, WebGL 2.0
 or desktop OpenGL.
 
-@see @ref MAGNUM_TARGET_GLES2
+@see @ref MAGNUM_TARGET_GLES2, @ref requires-webgl-only
+*/
+
+/** @page requires-webgl-only WebGL-only functionality
+@m_footernavigation
+
+The following symbols are not defined when targeting OpenGL ES or desktop
+OpenGL.
+
+@see @ref MAGNUM_TARGET_WEBGL, @ref requires-gles20-only
 */

doc/portability.dox

@@ -51,7 +51,8 @@ Example usage:
 @snippet MagnumGL.cpp portability-targets
 
 Each feature is marked accordingly if it is not available in some targets. See
-also @ref requires-gl, @ref requires-gles30 and @ref requires-gles20-only.
+also @ref requires-gl, @ref requires-gles30, @ref requires-gles20-only and
+@ref requires-webgl-only.
 
 @section portability-compiler Compiler- and platform-specific code