Split the OpenGL layer out, pt 26: remove dependencies on the GL lib.

Primitives, MeshTools, Trade and TextureTools are not depending on the
GL library anymore.

CMakeLists.txt

@@ -106,15 +106,15 @@ cmake_dependent_option(WITH_TGAIMPORTER "Build TgaImporter plugin" OFF "NOT WITH
 # Parts of the library
 cmake_dependent_option(WITH_AUDIO "Build Audio library" OFF "NOT WITH_AL_INFO;NOT WITH_ANYAUDIOIMPORTER;NOT WITH_WAVAUDIOIMPORTER" ON)
 option(WITH_DEBUGTOOLS "Build DebugTools library" ON)
-cmake_dependent_option(WITH_MESHTOOLS "Build MeshTools library" ON "( NOT WITH_DEBUGTOOLS OR ( NOT WITH_SHAPES AND NOT WITH_SCENEGRAPH ) ) AND NOT WITH_OBJIMPORTER" ON)
-cmake_dependent_option(WITH_PRIMITIVES "Builf Primitives library" ON "NOT WITH_DEBUGTOOLS OR NOT WITH_SHAPES" ON)
+cmake_dependent_option(WITH_MESHTOOLS "Build MeshTools library" ON "NOT WITH_OBJIMPORTER" ON)
 option(WITH_SHAPES "Build Shapes library" ON)
 cmake_dependent_option(WITH_SCENEGRAPH "Build SceneGraph library" ON "NOT WITH_SHAPES" ON)
-cmake_dependent_option(WITH_SHADERS "Build Shaders library" ON "NOT WITH_DEBUGTOOLS OR ( NOT WITH_SHAPES AND NOT WITH_SCENEGRAPH )" ON)
+option(WITH_SHADERS "Build Shaders library" ON)
 cmake_dependent_option(WITH_TEXT "Build Text library" ON "NOT WITH_FONTCONVERTER;NOT WITH_MAGNUMFONT;NOT WITH_MAGNUMFONTCONVERTER" ON)
 cmake_dependent_option(WITH_TEXTURETOOLS "Build TextureTools library" ON "NOT WITH_TEXT;NOT WITH_DISTANCEFIELDCONVERTER" ON)
 cmake_dependent_option(WITH_TRADE "Build Trade library" ON "NOT WITH_MESHTOOLS;NOT WITH_PRIMITIVES;NOT WITH_IMAGECONVERTER;NOT WITH_ANYIMAGEIMPORTER;NOT WITH_ANYIMAGECONVERTER;NOT WITH_ANYSCENEIMPORTER;NOT WITH_OBJIMPORTER;NOT WITH_TGAIMAGECONVERTER;NOT WITH_TGAIMPORTER" ON)
-cmake_dependent_option(WITH_GL "Build GL library" ON "NOT WITH_DEBUGTOOLS;NOT WITH_MESHTOOLS;NOT WITH_PRIMITIVES;NOT WITH_SHADERS;NOT WITH_TEXT;NOT WITH_TEXTURETOOLS;NOT WITH_TRADE;NOT WITH_GL_INFO;NOT WITH_ANDROIDAPPLICATION;NOT WITH_WINDOWLESSIOSAPPLICATION;NOT WITH_CGLCONTEXT;NOT WITH_GLXAPPLICATION;NOT WITH_GLXCONTEXT;NOT WITH_XEGLAPPLICATION;NOT WITH_WINDOWLESSWGLAPPLICATION;NOT WITH_GLXCONTEXT;NOT WITH_XEGLAPPLICATION;NOT WITH_WINDOWLESSWGLAPPLICATION;NOT WITH_WGLCONTEXT;NOT WITH_WINDOWLESSWINDOWSEGLAPPLICATION;NOT WITH_GLFWAPPLICATION;NOT WITH_GLUTAPPLICATION;NOT WITH_SDL2APPLICATION;NOT WITH_DISTANCEFIELDCONVERTER;NOT WITH_FONTCONVERTER;NOT WITH_IMAGECONVERTER" ON)
+cmake_dependent_option(WITH_GL "Build GL library" ON "NOT WITH_SHADERS;NOT WITH_TEXT;NOT WITH_GL_INFO;NOT WITH_ANDROIDAPPLICATION;NOT WITH_WINDOWLESSIOSAPPLICATION;NOT WITH_CGLCONTEXT;NOT WITH_GLXAPPLICATION;NOT WITH_GLXCONTEXT;NOT WITH_XEGLAPPLICATION;NOT WITH_WINDOWLESSWGLAPPLICATION;NOT WITH_GLXCONTEXT;NOT WITH_XEGLAPPLICATION;NOT WITH_WINDOWLESSWGLAPPLICATION;NOT WITH_WGLCONTEXT;NOT WITH_WINDOWLESSWINDOWSEGLAPPLICATION;NOT WITH_GLFWAPPLICATION;NOT WITH_GLUTAPPLICATION;NOT WITH_SDL2APPLICATION;NOT WITH_DISTANCEFIELDCONVERTER;NOT WITH_FONTCONVERTER;NOT WITH_IMAGECONVERTER" ON)
+option(WITH_PRIMITIVES "Builf Primitives library" ON)
 
 cmake_dependent_option(TARGET_GL "Build libraries with OpenGL interoperability" ON "WITH_GL" OFF)
 

doc/building.dox

@@ -385,8 +385,8 @@ available for desktop OpenGL only, see @ref requires-gl.
 
 -   `TARGET_GL` --- Build libraries with OpenGL interoperability enabled.
     Enabled by default when `WITH_GL` is enabled. Disabling this will cause
-    libraries to not depend on the @ref GL library, but doesn't affect the
-    @ref GL library itself.
+    other libraries to not depend on the @ref GL library, but doesn't affect
+    the @ref GL library itself.
 -   `TARGET_GLES` --- Target OpenGL ES. Available only when `WITH_GL` is
     enabled.
 -   `TARGET_GLES2` --- Target OpenGL ES 2.0 instead of 3.0 and later. Available
@@ -419,27 +419,24 @@ be built and which not:
 
 -   `WITH_AUDIO` --- Build the @ref Audio library. Depends on
     [OpenAL](https://www.openal.org/), not built by default.
--   `WITH_DEBUGTOOLS` --- Build the @ref DebugTools library. Enables also
-    building of the GL library.
--   `WITH_GL` --- Build the @ref GL library
+-   `WITH_DEBUGTOOLS` --- Build the @ref DebugTools library.
+-   `WITH_GL` --- Build the @ref GL library. Enabled automatically if
+    `WITH_SHADERS` or `WITH_TEXT` is enabled.
 -   `WITH_MESHTOOLS` --- Build the @ref MeshTools library. Enables also
-    building of the Trade and GL libraries.
+    building of the Trade library.
 -   `WITH_PRIMITIVES` --- Build the @ref Primitives library. Enables also
-    building of the Trade and GL libraries.
+    building of the Trade library.
 -   `WITH_SCENEGRAPH` --- Build the @ref SceneGraph library. Enabled
     automatically if `WITH_SHAPES` is enabled.
 -   `WITH_SHADERS` --- Build the @ref Shaders library. Enables also building of
     the GL library.
 -   `WITH_SHAPES` --- Build the @ref Shapes library. Enables also building of
-    the SceneGraph library. Enabled automatically if `WITH_DEBUGTOOLS` is
-    enabled.
+    the SceneGraph library.
 -   `WITH_TEXT` --- Build the @ref Text library. Enables also building of
     the TextureTools and GL libraries.
--   `WITH_TEXTURETOOLS` --- Build the @ref TextureTools library. Enables also
-    building of the GL library. Enabled automatically if `WITH_TEXT` or
-    `WITH_DISTANCEFIELDCONVERTER` is enabled.
--   `WITH_TRADE` --- Build the @ref Trade library. Enables also building of the
-    GL library.
+-   `WITH_TEXTURETOOLS` --- Build the @ref TextureTools library. Enabled
+    automatically if `WITH_TEXT` or `WITH_DISTANCEFIELDCONVERTER` is enabled.
+-   `WITH_TRADE` --- Build the @ref Trade library.
 
 There are more involved component dependencies that are not described here (for
 example the @ref DebugTools has some functionality that gets built only when

doc/changelog.dox

@@ -131,6 +131,11 @@ See also:
 
 @subsection changelog-latest-buildsystem Build system
 
+-   The core @ref Magnum library is not depending on OpenGL anymore, all
+    GL-related APIs are now part of a new @ref GL library
+-   @ref Primitives and @ref Trade libraries do not depend on OpenGL anymore
+-   @ref DebugTools, @ref MeshTools and @ref TextureTools have only an optional
+    dependency on the @ref GL library, controlled with `TARGET_GL` CMake option
 -   All plugin interfaces now implement
     @ref Corrade::PluginManager::AbstractPlugin::pluginSearchPaths() "pluginSearchPaths()"
     for plugin directory autodetection --- you no longer need to specify the

doc/namespaces.dox

@@ -280,6 +280,10 @@ find_package(Magnum REQUIRED MeshTools)
 target_link_libraries(your-app Magnum::MeshTools)
 @endcode
 
+Note that functionality depending on @ref GL APIs is available only if Magnum
+is built with both `WITH_GL` and `TARGET_GL` enabled (which is done by
+default).
+
 See @ref building and @ref cmake for more information.
 */
 
@@ -417,6 +421,10 @@ find_package(Magnum REQUIRED TextureTools)
 target_link_libraries(your-app Magnum::TextureTools)
 @endcode
 
+Note that functionality depending on @ref GL APIs is available only if Magnum
+is built with both `WITH_GL` and `TARGET_GL` enabled (which is done by
+default).
+
 See @ref building and @ref cmake for more information.
 */
 

modules/FindMagnum.cmake

@@ -336,9 +336,16 @@ foreach(_component ${Magnum_FIND_COMPONENTS})
     if(_component STREQUAL Audio)
         # no inter-component dependencies
     elseif(_component STREQUAL DebugTools)
+        if(MAGNUM_TARGET_GL)
+            # MeshTools, Primitives, SceneGraph, Shaders and Shapes are used
+            # only for GL renderers
             set(_MAGNUM_${_COMPONENT}_DEPENDENCIES MeshTools Primitives SceneGraph Shaders Shapes Trade GL)
+        endif()
     elseif(_component STREQUAL MeshTools)
+        if(MAGNUM_TARGET_GL)
+            # Trade is used only in compile(), which needs GL as well
             set(_MAGNUM_${_COMPONENT}_DEPENDENCIES Trade GL)
+        endif()
     elseif(_component STREQUAL OpenGLTester)
         if(MAGNUM_TARGET_HEADLESS OR CORRADE_TARGET_EMSCRIPTEN OR CORRADE_TARGET_ANDROID)
             set(_MAGNUM_${_COMPONENT}_DEPENDENCIES WindowlessEglApplication GL)
@@ -360,7 +367,7 @@ foreach(_component ${Magnum_FIND_COMPONENTS})
             endif()
         endif()
     elseif(_component STREQUAL Primitives)
-        set(_MAGNUM_${_COMPONENT}_DEPENDENCIES Trade GL)
+        set(_MAGNUM_${_COMPONENT}_DEPENDENCIES Trade)
     elseif(_component STREQUAL SceneGraph)
         # no dependencies except for the main lib
     elseif(_component STREQUAL Shaders)
@@ -370,9 +377,11 @@ foreach(_component ${Magnum_FIND_COMPONENTS})
     elseif(_component STREQUAL Text)
         set(_MAGNUM_${_COMPONENT}_DEPENDENCIES TextureTools GL)
     elseif(_component STREQUAL TextureTools)
+        if(MAGNUM_TARGET_GL)
             set(_MAGNUM_${_COMPONENT}_DEPENDENCIES GL)
+        endif()
     elseif(_component STREQUAL Trade)
-        set(_MAGNUM_${_COMPONENT}_DEPENDENCIES GL)
+        # no dependencies except for the main lib
     elseif(_component STREQUAL AndroidApplication)
         set(_MAGNUM_${_COMPONENT}_DEPENDENCIES GL)
     elseif(_component STREQUAL GlfwApplication)

src/Magnum/DebugTools/BufferData.h

@@ -25,7 +25,7 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#ifndef MAGNUM_TARGET_WEBGL
+#if defined(MAGNUM_TARGET_GL) && !defined(MAGNUM_TARGET_WEBGL)
 /** @file
  * @brief Function @ref Magnum::DebugTools::bufferData(), @ref Magnum::DebugTools::bufferSubData()
  */
@@ -36,7 +36,7 @@
 #include "Magnum/GL/Buffer.h"
 #include "Magnum/DebugTools/visibility.h"
 
-#ifndef MAGNUM_TARGET_WEBGL
+#if defined(MAGNUM_TARGET_GL) && !defined(MAGNUM_TARGET_WEBGL)
 namespace Magnum { namespace DebugTools {
 
 namespace Implementation {
@@ -48,6 +48,11 @@ namespace Implementation {
 
 Emulates @ref GL::Buffer::subData() call on platforms that don't support it
 (such as OpenGL ES) by using @ref GL::Buffer::map().
+
+@note This function is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
+
 @requires_gles30 Extension @extension{EXT,map_buffer_range} in OpenGL ES
     2.0.
 @requires_gles Buffer mapping is not available in WebGL.
@@ -63,6 +68,11 @@ template<class T> Containers::Array<T> inline bufferSubData(GL::Buffer& buffer,
 
 Emulates @ref GL::Buffer::data() call on platforms that don't support it (such
 as OpenGL ES) by using @ref GL::Buffer::map().
+
+@note This function is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
+
 @requires_gles30 Extension @extension{EXT,map_buffer_range} in OpenGL ES
     2.0.
 @requires_gles Buffer mapping is not available in WebGL.
@@ -75,7 +85,7 @@ template<class T = char> Containers::Array<T> inline bufferData(GL::Buffer& buff
 
 }}
 #else
-#error this header is not available in WebGL build
+#error this header is available only in the OpenGL (ES) build and not available in the WebGL build
 #endif
 
 #endif

src/Magnum/DebugTools/CMakeLists.txt

@@ -24,33 +24,28 @@
 #
 
 set(MagnumDebugTools_SRCS
-    Profiler.cpp
-    ResourceManager.cpp
-    TextureImage.cpp)
+    Profiler.cpp)
 
 set(MagnumDebugTools_HEADERS
     DebugTools.h
-    Profiler.h
-    ResourceManager.h
-    TextureImage.h
-    visibility.h)
+    Profiler.h)
 
 # Header files to display in project view of IDEs only
 set(MagnumDebugTools_PRIVATE_HEADERS )
 
-if(MAGNUM_TARGET_GLES AND NOT MAGNUM_TARGET_GLES2)
-    corrade_add_resource(MagnumDebugTools_RESOURCES resources.conf)
-    list(APPEND MagnumDebugTools_SRCS ${MagnumDebugTools_RESOURCES})
-endif()
-
-# Build the TestSuite-related functionality only if it is present
-find_package(Corrade COMPONENTS TestSuite)
-if(Corrade_TestSuite_FOUND)
+if(TARGET_GL)
     list(APPEND MagnumDebugTools_SRCS
-        CompareImage.cpp)
+        ResourceManager.cpp
+        TextureImage.cpp)
 
     list(APPEND MagnumDebugTools_HEADERS
-        CompareImage.h)
+        ResourceManager.h
+        TextureImage.h
+        visibility.h)
+
+    if(MAGNUM_TARGET_GLES AND NOT MAGNUM_TARGET_GLES2)
+        corrade_add_resource(MagnumDebugTools_RESOURCES resources.conf)
+        list(APPEND MagnumDebugTools_SRCS ${MagnumDebugTools_RESOURCES})
     endif()
 
     if(NOT MAGNUM_TARGET_WEBGL)
@@ -105,6 +100,17 @@ if(WITH_SHAPES)
             Implementation/PointRenderer.h
             Implementation/SphereRenderer.h)
     endif()
+endif()
+
+# Build the TestSuite-related functionality only if it is present
+find_package(Corrade COMPONENTS TestSuite)
+if(Corrade_TestSuite_FOUND)
+    list(APPEND MagnumDebugTools_SRCS
+        CompareImage.cpp)
+
+    list(APPEND MagnumDebugTools_HEADERS
+        CompareImage.h)
+endif()
 
 # DebugTools library
 add_library(MagnumDebugTools ${SHARED_OR_STATIC}
@@ -119,12 +125,12 @@ if(NOT BUILD_STATIC)
 elseif(BUILD_STATIC_PIC)
     set_target_properties(MagnumDebugTools PROPERTIES POSITION_INDEPENDENT_CODE ON)
 endif()
-target_link_libraries(MagnumDebugTools PUBLIC
-    Magnum
-    MagnumGL)
+target_link_libraries(MagnumDebugTools PUBLIC Magnum)
 if(Corrade_TestSuite_FOUND)
     target_link_libraries(MagnumDebugTools PUBLIC Corrade::TestSuite)
 endif()
+if(TARGET_GL)
+    target_link_libraries(MagnumDebugTools PUBLIC MagnumGL)
     if(WITH_SCENEGRAPH)
         target_link_libraries(MagnumDebugTools PUBLIC MagnumSceneGraph)
     endif()
@@ -136,6 +142,7 @@ if(WITH_SCENEGRAPH OR WITH_SHAPES)
             MagnumMeshTools
             MagnumShaders)
     endif()
+endif()
 
 install(TARGETS MagnumDebugTools
     RUNTIME DESTINATION ${MAGNUM_BINARY_INSTALL_DIR}

src/Magnum/DebugTools/DebugTools.h

@@ -34,6 +34,9 @@
 namespace Magnum { namespace DebugTools {
 
 #ifndef DOXYGEN_GENERATING_OUTPUT
+class Profiler;
+
+#ifdef MAGNUM_TARGET_GL
 template<UnsignedInt> class ForceRenderer;
 typedef ForceRenderer<2> ForceRenderer2D;
 typedef ForceRenderer<3> ForceRenderer3D;
@@ -44,7 +47,6 @@ typedef ObjectRenderer<2> ObjectRenderer2D;
 typedef ObjectRenderer<3> ObjectRenderer3D;
 class ObjectRendererOptions;
 
-class Profiler;
 class ResourceManager;
 
 template<UnsignedInt> class ShapeRenderer;
@@ -52,6 +54,7 @@ typedef ShapeRenderer<2> ShapeRenderer2D;
 typedef ShapeRenderer<3> ShapeRenderer3D;
 class ShapeRendererOptions;
 #endif
+#endif
 
 }}
 

src/Magnum/DebugTools/ForceRenderer.h

@@ -25,9 +25,11 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#ifdef MAGNUM_TARGET_GL
 /** @file
  * @brief Class @ref Magnum::DebugTools::ForceRenderer, @ref Magnum::DebugTools::ForceRendererOptions, typedef @ref Magnum::DebugTools::ForceRenderer2D, @ref Magnum::DebugTools::ForceRenderer3D
  */
+#endif
 
 #include "Magnum/Resource.h"
 #include "Magnum/GL/GL.h"
@@ -36,12 +38,17 @@
 #include "Magnum/Shaders/Shaders.h"
 #include "Magnum/DebugTools/visibility.h"
 
+#ifdef MAGNUM_TARGET_GL
 namespace Magnum { namespace DebugTools {
 
 /**
 @brief Force renderer options
 
 See @ref ForceRenderer documentation for more information.
+
+@note This class is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
 */
 class ForceRendererOptions {
     public:
@@ -101,6 +108,10 @@ Vector3 force;
 new DebugTools::ForceRenderer2D(object, {0.3f, 1.5f, -0.7f}, &force, "my", debugDrawables);
 @endcode
 
+@note This class is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
+
 @see @ref ForceRenderer2D, @ref ForceRenderer3D, @ref ForceRendererOptions
 */
 template<UnsignedInt dimensions> class MAGNUM_DEBUGTOOLS_EXPORT ForceRenderer: public SceneGraph::Drawable<dimensions, Float> {
@@ -148,5 +159,8 @@ typedef ForceRenderer<2> ForceRenderer2D;
 typedef ForceRenderer<3> ForceRenderer3D;
 
 }}
+#else
+#error this header is available only in the OpenGL build
+#endif
 
 #endif

src/Magnum/DebugTools/ObjectRenderer.h

@@ -25,9 +25,11 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#ifdef MAGNUM_TARGET_GL
 /** @file
  * @brief Class @ref Magnum::DebugTools::ObjectRenderer, @ref Magnum::DebugTools::ObjectRendererOptions, typedef @ref Magnum::DebugTools::ObjectRenderer2D, @ref Magnum::DebugTools::ObjectRenderer3D
  */
+#endif
 
 #include "Magnum/Resource.h"
 #include "Magnum/DebugTools/visibility.h"
@@ -35,12 +37,17 @@
 #include "Magnum/SceneGraph/Drawable.h"
 #include "Magnum/Shaders/Shaders.h"
 
+#ifdef MAGNUM_TARGET_GL
 namespace Magnum { namespace DebugTools {
 
 /**
 @brief Object renderer options
 
 See @ref ObjectRenderer documentation for more information.
+
+@note This class is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
 */
 class ObjectRendererOptions {
     public:
@@ -83,6 +90,10 @@ Object3D* object;
 new DebugTools::ObjectRenderer2D(object, "my", debugDrawables);
 @endcode
 
+@note This class is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
+
 @see @ref ObjectRenderer2D, @ref ObjectRenderer3D, @ref ObjectRendererOptions
 */
 template<UnsignedInt dimensions> class MAGNUM_DEBUGTOOLS_EXPORT ObjectRenderer: public SceneGraph::Drawable<dimensions, Float> {
@@ -117,5 +128,8 @@ typedef ObjectRenderer<2> ObjectRenderer2D;
 typedef ObjectRenderer<3> ObjectRenderer3D;
 
 }}
+#else
+#error this header is available only in the OpenGL build
+#endif
 
 #endif

src/Magnum/DebugTools/ResourceManager.h

@@ -25,9 +25,11 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#ifdef MAGNUM_TARGET_GL
 /** @file
  * @brief Class @ref Magnum::DebugTools::ResourceManager
  */
+#endif
 
 #include "Magnum/ResourceManager.h"
 
@@ -49,21 +51,27 @@
 #include "Magnum/GL/MeshView.h"
 #endif
 
-namespace Magnum {
-
-namespace DebugTools {
+#ifdef MAGNUM_TARGET_GL
+namespace Magnum { namespace DebugTools {
 
 /**
 @brief Resource manager for debug tools
 
 Stores various data used by debug renderers. See @ref debug-tools for more
 information.
+
+@note This class is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
 */
 class MAGNUM_DEBUGTOOLS_EXPORT ResourceManager: public Magnum::ResourceManager<Magnum::Implementation::ResourceManagerLocalInstance, GL::AbstractShaderProgram, GL::Buffer, GL::Mesh, GL::MeshView, DebugTools::ForceRendererOptions, DebugTools::ObjectRendererOptions, DebugTools::ShapeRendererOptions> {
     public:
         explicit ResourceManager();
         ~ResourceManager();
 };
+#else
+#error this header is available only in the OpenGL build
+#endif
 
 }}
 

src/Magnum/DebugTools/ShapeRenderer.h

@@ -25,9 +25,11 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#ifdef MAGNUM_TARGET_GL
 /** @file
  * @brief Class @ref Magnum::DebugTools::ShapeRenderer, @ref Magnum::DebugTools::ShapeRendererOptions, typedef @ref Magnum::DebugTools::ShapeRenderer2D, @ref Magnum::DebugTools::ShapeRenderer3D
  */
+#endif
 
 #include "Magnum/Resource.h"
 #include "Magnum/Math/Color.h"
@@ -36,6 +38,7 @@
 #include "Magnum/Shapes/shapeImplementation.h"
 #include "Magnum/DebugTools/visibility.h"
 
+#ifdef MAGNUM_TARGET_GL
 namespace Magnum { namespace DebugTools {
 
 template<UnsignedInt> class ShapeRenderer;
@@ -50,6 +53,10 @@ namespace Implementation {
 @brief Shape renderer options
 
 See @ref ShapeRenderer documentation for more information.
+
+@note This class is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
 */
 class ShapeRendererOptions {
     public:
@@ -134,6 +141,10 @@ Shapes::AbstractShape2D* shape;
 new DebugTools::ShapeRenderer2D(shape, "red", debugDrawables);
 @endcode
 
+@note This class is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
+
 @see @ref ShapeRenderer2D, @ref ShapeRenderer3D, @ref ShapeRendererOptions
 
 @todo Different drawing style for inverted shapes? (marking the "inside" somehow)
@@ -174,5 +185,8 @@ typedef ShapeRenderer<2> ShapeRenderer2D;
 typedef ShapeRenderer<3> ShapeRenderer3D;
 
 }}
+#else
+#error this header is available only in the OpenGL build
+#endif
 
 #endif

src/Magnum/DebugTools/Test/CMakeLists.txt

@@ -23,6 +23,12 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
+if(Corrade_TestSuite_FOUND)
+    corrade_add_test(DebugToolsCompareImageTest CompareImageTest.cpp LIBRARIES MagnumDebugTools)
+    set_target_properties(DebugToolsCompareImageTest PROPERTIES FOLDER "Magnum/DebugTools/Test")
+endif()
+
+if(TARGET_GL)
     if(WITH_SHAPES)
         corrade_add_test(DebugToolsCapsuleRendererTest CapsuleRendererTest.cpp LIBRARIES MagnumMathTestLib)
         corrade_add_test(DebugToolsCylinderRendererTest CylinderRendererTest.cpp LIBRARIES MagnumMathTestLib)
@@ -40,11 +46,6 @@ if(WITH_SCENEGRAPH)
         set_target_properties(DebugToolsForceRendererTest PROPERTIES FOLDER "Magnum/DebugTools/Test")
     endif()
 
-if(Corrade_TestSuite_FOUND)
-    corrade_add_test(DebugToolsCompareImageTest CompareImageTest.cpp LIBRARIES MagnumDebugTools)
-    set_target_properties(DebugToolsCompareImageTest PROPERTIES FOLDER "Magnum/DebugTools/Test")
-endif()
-
     if(BUILD_GL_TESTS)
         corrade_add_test(DebugToolsTextureImageGLTest TextureImageGLTest.cpp LIBRARIES MagnumDebugTools MagnumOpenGLTester)
         set_target_properties(DebugToolsTextureImageGLTest PROPERTIES FOLDER "Magnum/DebugTools/Test")
@@ -55,3 +56,4 @@ if(BUILD_GL_TESTS)
             set_target_properties(DebugToolsBufferDataGLTest PROPERTIES FOLDER "Magnum/DebugTools/Test")
         endif()
     endif()
+endif()

src/Magnum/MeshTools/CMakeLists.txt

@@ -25,8 +25,6 @@
 
 # Files shared between main library and unit test library
 set(MagnumMeshTools_SRCS
-    Compile.cpp
-    FullScreenTriangle.cpp
     Tipsify.cpp)
 
 # Files compiled with different flags for main library and unit test library
@@ -38,11 +36,9 @@ set(MagnumMeshTools_GracefulAssert_SRCS
 
 set(MagnumMeshTools_HEADERS
     CombineIndexedArrays.h
-    Compile.h
     CompressIndices.h
     Duplicate.h
     FlipNormals.h
-    FullScreenTriangle.h
     GenerateFlatNormals.h
     Interleave.h
     RemoveDuplicates.h
@@ -52,11 +48,21 @@ set(MagnumMeshTools_HEADERS
 
     visibility.h)
 
+if(TARGET_GL)
+    list(APPEND MagnumMeshTools_SRCS
+        Compile.cpp
+        FullScreenTriangle.cpp)
+
+    list(APPEND MagnumMeshTools_HEADERS
+        Compile.h
+        FullScreenTriangle.h)
+endif()
+
 # Objects shared between main and test library
 add_library(MagnumMeshToolsObjects OBJECT
     ${MagnumMeshTools_SRCS}
     ${MagnumMeshTools_HEADERS})
-target_include_directories(MagnumMeshToolsObjects PUBLIC $<TARGET_PROPERTY:MagnumGL,INTERFACE_INCLUDE_DIRECTORIES>)
+target_include_directories(MagnumMeshToolsObjects PUBLIC $<TARGET_PROPERTY:Magnum,INTERFACE_INCLUDE_DIRECTORIES>)
 if(NOT BUILD_STATIC)
     target_compile_definitions(MagnumMeshToolsObjects PRIVATE "MagnumMeshToolsObjects_EXPORTS")
 endif()
@@ -64,6 +70,9 @@ if(NOT BUILD_STATIC OR BUILD_STATIC_PIC)
     set_target_properties(MagnumMeshToolsObjects PROPERTIES POSITION_INDEPENDENT_CODE ON)
 endif()
 set_target_properties(MagnumMeshToolsObjects PROPERTIES FOLDER "Magnum/MeshTools")
+if(TARGET_GL)
+    target_include_directories(MagnumMeshToolsObjects PUBLIC $<TARGET_PROPERTY:MagnumGL,INTERFACE_INCLUDE_DIRECTORIES>)
+endif()
 
 # Main MeshTools library
 add_library(MagnumMeshTools ${SHARED_OR_STATIC}
@@ -78,8 +87,10 @@ elseif(BUILD_STATIC_PIC)
     set_target_properties(MagnumMeshTools PROPERTIES POSITION_INDEPENDENT_CODE ON)
 endif()
 target_link_libraries(MagnumMeshTools PUBLIC
-    Magnum
-    MagnumTrade)
+    Magnum)
+if(TARGET_GL)
+    target_link_libraries(MagnumMeshTools PUBLIC MagnumGL MagnumTrade)
+endif()
 
 install(TARGETS MagnumMeshTools
     RUNTIME DESTINATION ${MAGNUM_BINARY_INSTALL_DIR}
@@ -101,8 +112,10 @@ if(BUILD_TESTS)
         set_target_properties(MagnumMeshToolsTestLib PROPERTIES POSITION_INDEPENDENT_CODE ON)
     endif()
     target_link_libraries(MagnumMeshToolsTestLib PUBLIC
-        Magnum
-        MagnumTrade)
+        Magnum)
+    if(TARGET_GL)
+        target_link_libraries(MagnumMeshToolsTestLib PUBLIC MagnumGL MagnumTrade)
+    endif()
 
     # On Windows we need to install first and then run the tests to avoid "DLL
     # not found" hell, thus we need to install this too

src/Magnum/MeshTools/Compile.h

@@ -29,6 +29,9 @@
  * @brief Function @ref Magnum::MeshTools::compile()
  */
 
+#include "Magnum/configure.h"
+
+#ifdef MAGNUM_TARGET_GL
 #include <tuple>
 #include <memory>
 
@@ -55,6 +58,10 @@ This is just a convenience function for creating generic meshes, you might want
 to use @ref interleave() and @ref compressIndices() functions instead for
 greater flexibility.
 
+@note This function is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
+
 @see @ref shaders-generic
 */
 MAGNUM_MESHTOOLS_EXPORT std::tuple<GL::Mesh, std::unique_ptr<GL::Buffer>, std::unique_ptr<GL::Buffer>> compile(const Trade::MeshData2D& meshData, GL::BufferUsage usage);
@@ -76,10 +83,17 @@ This is just a convenience function for creating generic meshes, you might want
 to use @ref interleave() and @ref compressIndices() functions instead for
 greater flexibility.
 
+@note This function is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
+
 @see @ref shaders-generic
 */
 MAGNUM_MESHTOOLS_EXPORT std::tuple<GL::Mesh, std::unique_ptr<GL::Buffer>, std::unique_ptr<GL::Buffer>> compile(const Trade::MeshData3D& meshData, GL::BufferUsage usage);
 
 }}
+#else
+#error this header is available only in the OpenGL build
+#endif
 
 #endif

src/Magnum/MeshTools/CompressIndices.h

@@ -30,6 +30,7 @@
  */
 
 #include <tuple>
+#include <vector>
 
 #include "Magnum/Mesh.h"
 #include "Magnum/MeshTools/visibility.h"

src/Magnum/MeshTools/FullScreenTriangle.h

@@ -25,10 +25,15 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#ifdef MAGNUM_TARGET_GL
 /** @file
  * @brief Function @ref Magnum::MeshTools::fullScreenTriangle()
  */
+#endif
+
+#include "Magnum/configure.h"
 
+#ifdef MAGNUM_TARGET_GL
 #include <memory>
 #include <utility>
 
@@ -79,15 +84,25 @@ void main() {
     #endif
 }
 @endcode
+
+@note This function is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
 */
 std::pair<std::unique_ptr<GL::Buffer>, GL::Mesh> MAGNUM_MESHTOOLS_EXPORT fullScreenTriangle(GL::Version version);
 
-/**
-@overload
+/** @overload
 
 This function implicitly uses current context version.
+
+@note This function is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
 */
 std::pair<std::unique_ptr<GL::Buffer>, GL::Mesh> MAGNUM_MESHTOOLS_EXPORT fullScreenTriangle();
+#else
+#error this header is available only in the OpenGL build
+#endif
 
 }}
 

src/Magnum/TextureTools/CMakeLists.txt

@@ -23,20 +23,25 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
-corrade_add_resource(MagnumTextureTools_RCS resources.conf)
-set_target_properties(MagnumTextureTools_RCS-dependencies PROPERTIES FOLDER "Magnum/TextureTools")
-
 set(MagnumTextureTools_SRCS
-    Atlas.cpp
-    DistanceField.cpp
-    ${MagnumTextureTools_RCS})
+    Atlas.cpp)
 
 set(MagnumTextureTools_HEADERS
     Atlas.h
-    DistanceField.h
 
     visibility.h)
 
+if(TARGET_GL)
+    corrade_add_resource(MagnumTextureTools_RCS resources.conf)
+    set_target_properties(MagnumTextureTools_RCS-dependencies PROPERTIES FOLDER "Magnum/TextureTools")
+
+    list(APPEND MagnumTextureTools_SRCS
+        DistanceField.cpp
+        ${MagnumTextureTools_RCS})
+
+    list(APPEND MagnumTextureTools_HEADERS DistanceField.h)
+endif()
+
 # TextureTools library
 add_library(MagnumTextureTools ${SHARED_OR_STATIC}
     ${MagnumTextureTools_SRCS}
@@ -50,8 +55,10 @@ elseif(BUILD_STATIC_PIC)
     set_target_properties(MagnumTextureTools PROPERTIES POSITION_INDEPENDENT_CODE ON)
 endif()
 target_link_libraries(MagnumTextureTools PUBLIC
-    Magnum
-    MagnumGL)
+    Magnum)
+if(WITH_GL)
+    target_link_libraries(MagnumTextureTools PUBLIC MagnumGL)
+endif()
 
 install(TARGETS MagnumTextureTools
     RUNTIME DESTINATION ${MAGNUM_BINARY_INSTALL_DIR}

src/Magnum/TextureTools/DistanceField.h

@@ -29,6 +29,9 @@
  * @brief Function @ref Magnum::TextureTools::distanceField()
  */
 
+#include "Magnum/configure.h"
+
+#ifdef MAGNUM_TARGET_GL
 #include "Magnum/Magnum.h"
 #include "Magnum/GL/GL.h"
 #ifndef MAGNUM_TARGET_GLES
@@ -92,6 +95,10 @@ http://www.valvesoftware.com/publications/2007/SIGGRAPH2007_AlphaTestedMagnifica
     rendering to @ref GL::TextureFormat::Luminance is not supported in most
     cases.
 
+@note This function is available only if Magnum is compiled with
+    @ref MAGNUM_TARGET_GL enabled (done by default). See @ref building-features
+    for more information.
+
 @bug ES (and maybe GL < 3.20) implementation behaves slightly different
     (jaggies, visible e.g. when rendering outlined fonts)
 */
@@ -102,5 +109,8 @@ void MAGNUM_TEXTURETOOLS_EXPORT distanceField(GL::Texture2D& input, GL::Texture2
 #endif
 
 }}
+#else
+#error this header is available only in the OpenGL build
+#endif
 
 #endif

src/Magnum/Trade/CMakeLists.txt

@@ -74,7 +74,6 @@ add_library(MagnumTradeObjects OBJECT
     ${MagnumTrade_HEADERS})
 target_include_directories(MagnumTradeObjects PUBLIC
     $<TARGET_PROPERTY:Magnum,INTERFACE_INCLUDE_DIRECTORIES>
-    $<TARGET_PROPERTY:MagnumGL,INTERFACE_INCLUDE_DIRECTORIES>
     $<TARGET_PROPERTY:Corrade::PluginManager,INTERFACE_INCLUDE_DIRECTORIES>)
 if(NOT BUILD_STATIC)
     target_compile_definitions(MagnumTradeObjects PRIVATE "MagnumTradeObjects_EXPORTS")
@@ -98,7 +97,6 @@ elseif(BUILD_STATIC_PIC)
 endif()
 target_link_libraries(MagnumTrade PUBLIC
     Magnum
-    MagnumGL
     Corrade::PluginManager)
 
 install(TARGETS MagnumTrade
@@ -138,7 +136,6 @@ if(BUILD_TESTS)
     endif()
     target_link_libraries(MagnumTradeTestLib
         Magnum
-        MagnumGL
         Corrade::PluginManager)
 
     # On Windows we need to install first and then run the tests to avoid "DLL