Revert "Replace glew with epoxy"

This reverts merge request !2217

3d-viewer/3d_canvas/eda_3d_canvas.cpp

@@ -22,7 +22,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h>    // Must be included first
 #include <gal/opengl/gl_utils.h>
 #include <wx/tokenzr.h>
 
@@ -226,12 +226,21 @@ bool  EDA_3D_CANVAS::initializeOpenGL()
 {
     wxLogTrace( m_logTrace, wxT( "EDA_3D_CANVAS::initializeOpenGL" ) );
 
-    // Check the OpenGL version (minimum 2.1 is required)
+    const GLenum err = glewInit();
-    if( epoxy_gl_version() < 21 )
+
+    if( GLEW_OK != err )
     {
-        wxLogMessage( wxS( "OpenGL 2.1 or higher is required!" ) );
+        const wxString msgError = (const char*) glewGetErrorString( err );
+
+        wxLogMessage( msgError );
+
         return false;
     }
+    else
+    {
+        wxLogTrace( m_logTrace, wxT( "EDA_3D_CANVAS::initializeOpenGL Using GLEW version %s" ),
+                    From_UTF8( (char*) glewGetString( GLEW_VERSION ) ) );
+    }
 
     SetOpenGLInfo( (const char*) glGetString( GL_VENDOR ), (const char*) glGetString( GL_RENDERER ),
                    (const char*) glGetString( GL_VERSION ) );

3d-viewer/3d_model_viewer/eda_3d_model_viewer.cpp

@@ -27,7 +27,7 @@
  * 3d models that come in the original data from the files without any transformations.
  */
 
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h>    // Must be included first
 #include <iostream>
 #include "3d_rendering/opengl/3d_model.h"
 #include "eda_3d_model_viewer.h"
@@ -183,17 +183,23 @@ void EDA_3D_MODEL_VIEWER::Clear3DModel()
 
 void EDA_3D_MODEL_VIEWER::ogl_initialize()
 {
-    // Check the OpenGL version (minimum 2.1 is required)
+    const GLenum err = glewInit();
-    if( epoxy_gl_version() < 21 )
+
-        wxLogMessage( wxS( "OpenGL 2.1 or higher is required!" ) );
+    if( GLEW_OK != err )
+    {
+        const wxString msgError = (const char*) glewGetErrorString( err );
+
+        wxLogMessage( msgError );
+    }
+    else
+    {
+        wxLogTrace( m_logTrace, wxT( "EDA_3D_MODEL_VIEWER::ogl_initialize Using GLEW version %s" ),
+                    From_UTF8( (char*) glewGetString( GLEW_VERSION ) ) );
+    }
 
     SetOpenGLInfo( (const char*) glGetString( GL_VENDOR ), (const char*) glGetString( GL_RENDERER ),
                    (const char*) glGetString( GL_VERSION ) );
 
-    wxString version = From_UTF8( (char*) glGetString( GL_VERSION ) );
-
-    wxLogTrace( m_logTrace, wxS( "EDA_3D_MODEL_VIEWER::%s OpenGL version string %s." ), __WXFUNCTION__, version );
-
     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
     glHint( GL_LINE_SMOOTH_HINT, GL_NICEST );
     glHint( GL_POLYGON_SMOOTH_HINT, GL_NICEST );

3d-viewer/3d_rendering/opengl/3d_model.cpp

@@ -28,7 +28,7 @@
  */
 #include <algorithm>
 #include <stdexcept>
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h>    // Must be included first
 
 #include "3d_model.h"
 #include "../common_ogl/ogl_utils.h"

3d-viewer/3d_rendering/opengl/render_3d_opengl.cpp

@@ -24,7 +24,7 @@
  */
 
 #include <cstdint>
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h>    // Must be included first
 
 #include "plugins/3dapi/xv3d_types.h"
 #include "render_3d_opengl.h"

3d-viewer/3d_rendering/raytracing/render_3d_raytrace_gl.cpp

@@ -23,7 +23,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h>    // Must be included first
 
 #include <algorithm>
 #include <atomic>
@@ -217,7 +217,7 @@ bool RENDER_3D_RAYTRACE_GL::Redraw( bool aIsMoving, REPORTER* aStatusReporter,
 
 void RENDER_3D_RAYTRACE_GL::initPbo()
 {
-    if( epoxy_has_gl_extension( "GL_ARB_pixel_buffer_object" ) )
+    if( GLEW_ARB_pixel_buffer_object )
     {
         m_openglSupportsVertexBufferObjects = true;
 
@@ -238,6 +238,7 @@ void RENDER_3D_RAYTRACE_GL::initPbo()
         glBufferDataARB( GL_PIXEL_UNPACK_BUFFER_ARB, m_pboDataSize, 0, GL_STREAM_DRAW_ARB );
         glBindBufferARB( GL_PIXEL_UNPACK_BUFFER_ARB, 0 );
 
-        wxLogTrace( m_logTrace, wxS( "RENDER_3D_RAYTRACE_GL:: GL_ARB_pixel_buffer_object is supported" ) );
+        wxLogTrace( m_logTrace,
+                    wxT( "RENDER_3D_RAYTRACE_GL:: GLEW_ARB_pixel_buffer_object is supported" ) );
     }
 }

3d-viewer/common_ogl/ogl_utils.cpp

@@ -28,7 +28,7 @@
  */
 
 #include <stdexcept>
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h>    // Must be included first
 
 #include "openGL_includes.h"
 #include "ogl_utils.h"

CMakeLists.txt

@@ -115,6 +115,17 @@ option( KICAD_UPDATE_CHECK
     "Build in update check"
     ON )
 
+# EGL is only needed on Linux with Wayland
+cmake_dependent_option( KICAD_USE_EGL
+    "Build KiCad with EGL backend support for Wayland."
+    OFF "UNIX_NOT_APPLE"
+    OFF)
+
+cmake_dependent_option( KICAD_USE_BUNDLED_GLEW
+    "Use the bundled version of GLEW - only available when KICAD_USE_EGL is set"
+    ON "KICAD_USE_EGL"
+    OFF )
+
 cmake_dependent_option( KICAD_WAYLAND
     "Support Wayland features"
     ON "KICAD_USE_EGL"
@@ -275,6 +286,16 @@ add_compile_definitions( $<$<BOOL:${KICAD_GAL_PROFILE}>:KICAD_GAL_PROFILE> )
 add_compile_definitions( $<$<BOOL:${KICAD_WIN32_VERIFY_CODESIGN}>:KICAD_WIN32_VERIFY_CODESIGN> )
 add_compile_definitions( $<$<BOOL:${KICAD_UPDATE_CHECK}>:KICAD_UPDATE_CHECK> )
 
+if( KICAD_USE_EGL )
+    message( STATUS "Configuring KiCad for the wxGLCanvas EGL backend" )
+    add_compile_definitions( KICAD_USE_EGL )
+endif()
+
+if( KICAD_WAYLAND )
+    message( STATUS "Configuring KiCad to support Wayland features" )
+    add_compile_definitions( KICAD_WAYLAND )
+endif()
+
 if( KICAD_IPC_API )
     add_definitions( -DKICAD_IPC_API )
 endif()
@@ -734,6 +755,50 @@ if( KICAD_BUILD_I18N )
     find_package( Gettext REQUIRED )
 endif()
 
+#
+# Find OpenGL library, required
+#
+if( KICAD_USE_EGL )
+    find_package( OpenGL REQUIRED COMPONENTS OpenGL EGL )
+else()
+    set( OpenGL_GL_PREFERENCE "LEGACY" )     # CMake 3.11+ setting; see 'cmake --help-policy CMP0072'
+    find_package( OpenGL REQUIRED )
+endif()
+
+#
+# Find GLEW library, required
+#
+# The EGL canvas on GTK requires the use of a GLEW version compiled with an EGL flag.
+# The one built in the thirdparty directory has the flag for EGL set, so we use it unless told
+# otherwise. Then we search for the system GLEW version and use that instead.
+#
+if( KICAD_USE_EGL AND KICAD_USE_BUNDLED_GLEW AND UNIX AND NOT APPLE )
+    if( OpenGL_EGL_FOUND )
+        message( STATUS "Found OpenGL EGL library: ${OPENGL_egl_LIBRARY}" )
+    else()
+        message( FATAL_ERROR "OpenGL EGL library not found" )
+    endif()
+
+    # Add the custom GLEW target
+    add_subdirectory( thirdparty/glew )
+
+    # Set the standard package variables to point to our custom target to mimic the system version.
+    set( GLEW_LIBRARIES glew )
+    set( GLEW_FOUND TRUE )
+    include_directories( SYSTEM $<TARGET_PROPERTY:glew,INCLUDE_DIRECTORIES> )
+else()
+    find_package( GLEW REQUIRED )
+    check_find_package_result( GLEW_FOUND "GLEW" )
+    include_directories( SYSTEM ${GLEW_INCLUDE_DIR} )
+endif()
+
+#
+# Find GLM library, required
+#
+find_package( GLM 0.9.8 REQUIRED )
+add_compile_definitions( GLM_FORCE_CTOR_INIT )
+include_directories( SYSTEM ${GLM_INCLUDE_DIR} )
+
 #
 # Find zlib library, required
 #
@@ -1012,8 +1077,6 @@ else()
     message( FATAL_ERROR "Unable to detect wxWidgets port")
 endif()
 
-message(STATUS "wxUSE_GLCANVAS_EGL=${wxWidgets_GLCANVAS_EGL}")
-
 if( NOT MSVC )
     if( ${wxWidgets_VERSION_STRING} VERSION_LESS 3.2 )
         message( FATAL_ERROR "wxWidgets 3.2.0 or greater is required" )
@@ -1048,45 +1111,6 @@ if( APPLE )
         )
 endif()
 
-#
-# Find OpenGL library, required
-#
-if( wxWidgets_GLCANVAS_EGL EQUAL 1 )
-    set( KICAD_USE_EGL ON )
-    find_package( OpenGL REQUIRED COMPONENTS OpenGL EGL )
-else()
-    set( KICAD_USE_EGL OFF )
-    set( OpenGL_GL_PREFERENCE "LEGACY" )     # CMake 3.11+ setting; see 'cmake --help-policy CMP0072'
-    find_package( OpenGL REQUIRED )
-endif()
-if( NOT OPENGL_GLU_FOUND )
-    MESSAGE( FATAL_ERROR "The OpenGL GLU library is required." )
-endif()
-
-if( KICAD_USE_EGL )
-    message( STATUS "Configuring KiCad for the wxGLCanvas EGL backend" )
-    add_compile_definitions( KICAD_USE_EGL )
-endif()
-
-if( KICAD_WAYLAND )
-    message( STATUS "Configuring KiCad to support Wayland features" )
-    add_compile_definitions( KICAD_WAYLAND )
-endif()
-
-#
-# Find Epoxy library, required
-#
-find_package( epoxy REQUIRED )
-check_find_package_result( EPOXY_FOUND "epoxy" )
-include_directories( SYSTEM ${epoxy_INCLUDE_DIR} )
-
-#
-# Find GLM library, required
-#
-find_package( GLM 0.9.8 REQUIRED )
-add_compile_definitions( GLM_FORCE_CTOR_INIT )
-include_directories( SYSTEM ${GLM_INCLUDE_DIR} )
-
 
 if( KICAD_USE_SENTRY )
     set( KICAD_SENTRY_DSN "" CACHE STRING "The sentry DSN used with sentry integration" )

LICENSE.README

@@ -35,6 +35,8 @@ Licensed under MIT:
 - sentry-native in thirdparty/sentry-native
 - thread-pool in thirdparty/thread-pool
 - tinyspline_lib in thirdparty/tinyspline_lib
+Licensed under MIT and BSD:
+- glew in thirdparty/glew
 Licensed under BSD:
 - pybind11 in thirdparty/pybind11
 Licensed under BSD2:

cmake/FindGLEW.cmake

@@ -0,0 +1,69 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#.rst:
+# FindGLEW
+# --------
+#
+# Find the OpenGL Extension Wrangler Library (GLEW)
+#
+# IMPORTED Targets
+# ^^^^^^^^^^^^^^^^
+#
+# This module defines the :prop_tgt:`IMPORTED` target ``GLEW::GLEW``,
+# if GLEW has been found.
+#
+# Result Variables
+# ^^^^^^^^^^^^^^^^
+#
+# This module defines the following variables:
+#
+# ::
+#
+#   GLEW_INCLUDE_DIRS - include directories for GLEW
+#   GLEW_LIBRARIES - libraries to link against GLEW
+#   GLEW_FOUND - true if GLEW has been found and can be used
+
+find_path(GLEW_INCLUDE_DIR GL/glew.h)
+
+if(NOT GLEW_LIBRARY)
+  find_library(GLEW_LIBRARY_RELEASE NAMES GLEW glew32 glew glew32s PATH_SUFFIXES lib64)
+  find_library(GLEW_LIBRARY_DEBUG NAMES GLEWd glew32d glewd PATH_SUFFIXES lib64)
+
+  include(SelectLibraryConfigurations)
+  select_library_configurations(GLEW)
+endif ()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(GLEW
+                                  REQUIRED_VARS GLEW_INCLUDE_DIR GLEW_LIBRARY)
+
+if(GLEW_FOUND)
+  set(GLEW_INCLUDE_DIRS ${GLEW_INCLUDE_DIR})
+
+  if(NOT GLEW_LIBRARIES)
+    set(GLEW_LIBRARIES ${GLEW_LIBRARY})
+  endif()
+
+  if (NOT TARGET GLEW::GLEW)
+    add_library(GLEW::GLEW UNKNOWN IMPORTED)
+    set_target_properties(GLEW::GLEW PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${GLEW_INCLUDE_DIRS}")
+
+    if(GLEW_LIBRARY_RELEASE)
+      set_property(TARGET GLEW::GLEW APPEND PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
+      set_target_properties(GLEW::GLEW PROPERTIES IMPORTED_LOCATION_RELEASE "${GLEW_LIBRARY_RELEASE}")
+    endif()
+
+    if(GLEW_LIBRARY_DEBUG)
+      set_property(TARGET GLEW::GLEW APPEND PROPERTY IMPORTED_CONFIGURATIONS DEBUG)
+      set_target_properties(GLEW::GLEW PROPERTIES IMPORTED_LOCATION_DEBUG "${GLEW_LIBRARY_DEBUG}")
+    endif()
+
+    if(NOT GLEW_LIBRARY_RELEASE AND NOT GLEW_LIBRARY_DEBUG)
+      set_property(TARGET GLEW::GLEW APPEND PROPERTY IMPORTED_LOCATION "${GLEW_LIBRARY}")
+    endif()
+  endif()
+endif()
+
+mark_as_advanced(GLEW_INCLUDE_DIR)

cmake/Findepoxy.cmake

@@ -1,106 +0,0 @@
-# SPDX-FileCopyrightText: 2014 Fredrik Höglund <fredrik@kde.org>
-# SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
-#
-# SPDX-License-Identifier: BSD-3-Clause
-
-#[=======================================================================[.rst:
-Findepoxy
----------
-
-Try to find libepoxy on a Unix system.
-
-This will define the following variables:
-
-``epoxy_FOUND``
-    True if (the requested version of) libepoxy is available
-``epoxy_VERSION``
-    The version of libepoxy
-``epoxy_LIBRARIES``
-    This should be passed to target_link_libraries() if the target is not
-    used for linking
-``epoxy_INCLUDE_DIRS``
-    This should be passed to target_include_directories() if the target is not
-    used for linking
-``epoxy_DEFINITIONS``
-    This should be passed to target_compile_options() if the target is not
-    used for linking
-``epoxy_HAS_GLX``
-    True if GLX support is available
-``epoxy_HAS_EGL``
-    True if EGL support is available
-``epoxy_HAS_WGL``
-    True if WGL support is available
-
-If ``epoxy_FOUND`` is TRUE, it will also define the following imported target:
-
-``epoxy::epoxy``
-    The epoxy library
-
-In general we recommend using the imported target, as it is easier to use.
-Bear in mind, however, that if the target is in the link interface of an
-exported library, it must be made available by the package config file.
-#]=======================================================================]
-
-find_package(PkgConfig QUIET)
-pkg_check_modules(PKG_epoxy QUIET epoxy)
-
-set(epoxy_VERSION ${PKG_epoxy_VERSION})
-set(epoxy_DEFINITIONS ${PKG_epoxy_CFLAGS})
-
-find_path(epoxy_INCLUDE_DIRS
-    NAMES epoxy/gl.h
-    HINTS ${PKG_epoxy_INCLUDEDIR} ${PKG_epoxy_INCLUDE_DIRS}
-)
-find_library(epoxy_LIBRARIES
-    NAMES epoxy
-    HINTS ${PKG_epoxy_LIBDIR} ${PKG_epoxy_LIBRARY_DIRS}
-)
-find_file(epoxy_GLX_HEADER NAMES epoxy/glx.h HINTS ${epoxy_INCLUDE_DIR})
-
-if (epoxy_GLX_HEADER STREQUAL "epoxy_GLX_HEADER-NOTFOUND")
-    set(epoxy_HAS_GLX FALSE CACHE BOOL "whether glx is available")
-else ()
-    set(epoxy_HAS_GLX TRUE CACHE BOOL "whether glx is available")
-endif()
-
-find_file(epoxy_EGL_HEADER NAMES epoxy/egl.h HINTS ${epoxy_INCLUDE_DIR})
-
-if (epoxy_EGL_HEADER STREQUAL "epoxy_EGL_HEADER-NOTFOUND")
-    set(epoxy_HAS_EGL FALSE CACHE BOOL "whether egl is available")
-else ()
-    set(epoxy_HAS_EGL TRUE CACHE BOOL "whether egl is available")
-endif()
-
-find_file(epoxy_WGL_HEADER NAMES epoxy/wgl.h HINTS ${epoxy_INCLUDE_DIR})
-
-if (epoxy_WGL_HEADER STREQUAL "epoxy_WGL_HEADER-NOTFOUND")
-    set(epoxy_HAS_WGL FALSE CACHE BOOL "whether wgl is available")
-else ()
-    set(epoxy_HAS_WGL TRUE CACHE BOOL "whether wgl is available")
-endif()
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(epoxy
-    FOUND_VAR epoxy_FOUND
-    REQUIRED_VARS epoxy_LIBRARIES epoxy_INCLUDE_DIRS
-    VERSION_VAR epoxy_VERSION
-)
-
-if (epoxy_FOUND AND NOT TARGET epoxy::epoxy)
-    add_library(epoxy::epoxy UNKNOWN IMPORTED)
-    set_target_properties(epoxy::epoxy PROPERTIES
-        IMPORTED_LOCATION "${epoxy_LIBRARIES}"
-        INTERFACE_COMPILE_OPTIONS "${epoxy_DEFINITIONS}"
-        INTERFACE_INCLUDE_DIRECTORIES "${epoxy_INCLUDE_DIRS}"
-    )
-endif()
-
-mark_as_advanced(
-    epoxy_DEFINITIONS
-    epoxy_HAS_GLX
-    epoxy_HAS_EGL
-    epoxy_HAS_WGL
-    epoxy_INCLUDE_DIRS
-    epoxy_LIBRARIES
-    epoxy_VERSION
-)

cmake/FindwxWidgets.cmake

@@ -784,14 +784,6 @@ else()
 
         DBG_MSG_V("wxWidgets_CXX_FLAGS=${wxWidgets_CXX_FLAGS}")
 
-        execute_process(
-          COMMAND sh -c "echo '#include <wx/platform.h>' ; echo CMAKE_WXTEST_RESULT wxUSE_GLCANVAS_EGL"
-          COMMAND ${CMAKE_CXX_COMPILER} ${wxWidgets_CXX_FLAGS} -E -
-          COMMAND grep CMAKE_WXTEST_RESULT
-          COMMAND awk "{print $2}"
-          OUTPUT_STRIP_TRAILING_WHITESPACE
-          OUTPUT_VARIABLE   wxWidgets_GLCANVAS_EGL )
-
         # parse definitions from cxxflags;
         #   drop -D* from CXXFLAGS and the -D prefix
         string(REGEX MATCHALL "-D[^;]+"

common/CMakeLists.txt

@@ -21,6 +21,9 @@ include_directories(
 # Get the GAL Target
 add_subdirectory( gal )
 
+# Only for win32 cross compilation using MXE
+add_compile_definitions( $<$<AND:$<BOOL:${WIN32}>,$<BOOL:${MSYS}>>:GLEW_STATIC> )
+
 
 # The build version string defaults to the value in the KiCadVersion.cmake file.
 # If being built inside a git repository, the git tag and commit hash are used to create

common/gal/CMakeLists.txt

@@ -65,7 +65,7 @@ target_link_libraries( gal
     kimath
     kiplatform
     nlohmann_json
-    ${epoxy_LIBRARIES}
+    ${GLEW_LIBRARIES}
     ${CAIRO_LIBRARIES}
     ${PIXMAN_LIBRARIES}
     ${OPENGL_LIBRARIES}
@@ -143,4 +143,4 @@ add_shader( gal smaa_pass_1_vert.glsl glsl_smaa_pass_1_vert )
 add_shader( gal smaa_pass_2_frag.glsl glsl_smaa_pass_2_frag )
 add_shader( gal smaa_pass_2_vert.glsl glsl_smaa_pass_2_vert )
 add_shader( gal smaa_pass_3_frag.glsl glsl_smaa_pass_3_frag )
-add_shader( gal smaa_pass_3_vert.glsl glsl_smaa_pass_3_vert )
+add_shader( gal smaa_pass_3_vert.glsl glsl_smaa_pass_3_vert )

common/gal/opengl/cached_container_gpu.cpp

@@ -54,7 +54,7 @@ CACHED_CONTAINER_GPU::CACHED_CONTAINER_GPU( unsigned int aSize ) :
         m_isMapped( false ),
         m_glBufferHandle( -1 )
 {
-    m_useCopyBuffer = epoxy_has_gl_extension( "GL_ARB_copy_buffer" );
+    m_useCopyBuffer = GLEW_ARB_copy_buffer;
 
     wxString vendor( glGetString( GL_VENDOR ) );
 

common/gal/opengl/opengl_gal.cpp

@@ -2694,27 +2694,44 @@ void OPENGL_GAL::init()
     // Check correct initialization from the constructor
     if( m_tesselator == nullptr )
         throw std::runtime_error( "Could not create the tesselator" );
+    GLenum err = glewInit();
+
+#ifdef KICAD_USE_EGL
+    // TODO: better way to check when EGL is ready (init fails at "getString(GL_VERSION)")
+    for( int i = 0; i < 10; i++ )
+    {
+        if( GLEW_OK == err )
+            break;
+
+        std::this_thread::sleep_for( std::chrono::milliseconds( 250 ) );
+        err = glewInit();
+    }
+
+#endif // KICAD_USE_EGL
 
     SetOpenGLInfo( (const char*) glGetString( GL_VENDOR ), (const char*) glGetString( GL_RENDERER ),
                    (const char*) glGetString( GL_VERSION ) );
 
+    if( GLEW_OK != err )
+        throw std::runtime_error( (const char*) glewGetErrorString( err ) );
+
     // Check the OpenGL version (minimum 2.1 is required)
-    if( epoxy_gl_version() < 21 )
+    if( !GLEW_VERSION_2_1 )
         throw std::runtime_error( "OpenGL 2.1 or higher is required!" );
 
 #if defined( __LINUX__ ) // calling enableGlDebug crashes opengl on some OS (OSX and some Windows)
 #ifdef DEBUG
-    if( epoxy_has_gl_extension( "GL_ARB_debug_output" ) )
+    if( GLEW_ARB_debug_output )
         enableGlDebug( true );
 #endif
 #endif
 
     // Framebuffers have to be supported
-    if( !epoxy_has_gl_extension( "GL_EXT_framebuffer_object" ) )
+    if( !GLEW_EXT_framebuffer_object )
         throw std::runtime_error( "Framebuffer objects are not supported!" );
 
     // Vertex buffer has to be supported
-    if( !epoxy_has_gl_extension( "GL_ARB_vertex_buffer_object" ) )
+    if( !GLEW_ARB_vertex_buffer_object )
         throw std::runtime_error( "Vertex buffer objects are not supported!" );
 
     // Prepare shaders

common/gal/opengl/utils.cpp

@@ -26,7 +26,7 @@
 
 #include <confirm.h> // DisplayError
 
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h> // Must be included first
 
 #include <stdexcept>
 #include <wx/log.h> // wxLogDebug

include/gal/opengl/gl_utils.h

@@ -24,7 +24,7 @@
 #ifndef GL_UTILS_H
 #define GL_UTILS_H
 
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h> // Must be included first
 #include <wx/glcanvas.h>
 #include <wx/utils.h>
 

include/gal/opengl/kiglew.h

@@ -36,14 +36,13 @@
 // includes since they transitively include the OpenGL headers.
 #define GL_SILENCE_DEPRECATION 1
 
-#include <epoxy/gl.h>
-
 #if defined( __unix__ ) and not defined( __APPLE__ )
 
     #ifdef KICAD_USE_EGL
 
         #if wxUSE_GLCANVAS_EGL
-            #include <epoxy/egl.h>
+            // wxWidgets was compiled with the EGL canvas, so use the EGL header for GLEW
+            #include <GL/eglew.h>
         #else
             #error "KICAD_USE_EGL can only be used when wxWidgets is compiled with the EGL canvas"
         #endif
@@ -53,19 +52,23 @@
         #if wxUSE_GLCANVAS_EGL
             #error "KICAD_USE_EGL must be defined since wxWidgets has been compiled with the EGL canvas"
         #else
-            #include <epoxy/glx.h>
+            // wxWidgets wasn't compiled with the EGL canvas, so use the X11 GLEW
+            #include <GL/glxew.h>
         #endif
 
     #endif  // KICAD_USE_EGL
 
+#else   // defined( __unix__ ) and not defined( __APPLE__ )
+
+    // Non-GTK platforms only need the normal GLEW include
+    #include <GL/glew.h>
+
 #endif  // defined( __unix__ ) and not defined( __APPLE__ )
 
 #ifdef _WIN32
 
-    #include <epoxy/wgl.h>
+    #include <GL/wglew.h>
 
 #endif  // _WIN32
 
-#include <GL/glu.h>
-
 #endif  // KIGLEW_H_

include/gal/opengl/opengl_compositor.h

@@ -33,7 +33,7 @@
 #ifndef OPENGL_COMPOSITOR_H_
 #define OPENGL_COMPOSITOR_H_
 
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h>    // Must be included first
 
 #include <gal/compositor.h>
 #include <gal/opengl/antialiasing.h>

include/gal/opengl/shader.h

@@ -29,7 +29,7 @@
 #ifndef SHADER_H_
 #define SHADER_H_
 
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h>    // Must be included first
 
 #include <math/vector2d.h>
 

include/gal/opengl/vertex_common.h

@@ -32,7 +32,7 @@
 #ifndef VERTEX_COMMON_H_
 #define VERTEX_COMMON_H_
 
-#include <gal/opengl/kiepoxy.h> // Must be included first
+#include <gal/opengl/kiglew.h>    // Must be included first
 
 #include <math/vector2d.h>
 

thirdparty/CMakeLists.txt

@@ -24,6 +24,8 @@
 # Disable shared library building for all thirdparty libraries
 set( BUILD_SHARED_LIBS OFF )
 
+# Note: The glew folder isn't added here because it is added inside the main CMakeLists.txt
+
 # If this is not set, then we cannot set things like ARGPARSE_INSTALL to OFF before the
 # argparse subdirectory is added.  Under the new policy, add_option will allow itself to
 # be overridden by a previously-set variable like we want to do here.  Doing it this way

thirdparty/glew/CMakeLists.txt

@@ -0,0 +1,21 @@
+add_library( glew STATIC )
+
+# Mark the include directory as private so that it doesn't get used by other targets
+# and is only used when building the actual library.
+# The actual include directories will be added to the global include paths as
+# system headers
+target_include_directories( glew PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/include" )
+
+# Definitions for compiling GLEW staticly for EGL (extracted from the main GLEW CMakeLists.txt file)
+add_compile_definitions( GLEW_STATIC )
+add_compile_definitions( GLEW_EGL )
+add_compile_definitions( GLEW_NO_GLU )
+
+target_sources( glew PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/glew.c
+    )
+
+target_link_libraries( glew PUBLIC
+    ${OPENGL_LIBRARIES}
+    ${OPENGL_egl_LIBRARY}
+    )

thirdparty/glew/LICENSE.txt

@@ -0,0 +1,73 @@
+The OpenGL Extension Wrangler Library
+Copyright (C) 2002-2007, Milan Ikits <milan ikits[]ieee org>
+Copyright (C) 2002-2007, Marcelo E. Magallon <mmagallo[]debian org>
+Copyright (C) 2002, Lev Povalahev
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without 
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, 
+  this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright notice, 
+  this list of conditions and the following disclaimer in the documentation 
+  and/or other materials provided with the distribution.
+* The name of the author may be used to endorse or promote products 
+  derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+THE POSSIBILITY OF SUCH DAMAGE.
+
+
+Mesa 3-D graphics library
+Version:  7.0
+
+Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+Copyright (c) 2007 The Khronos Group Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and/or associated documentation files (the
+"Materials"), to deal in the Materials without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Materials, and to
+permit persons to whom the Materials are furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Materials.
+
+THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.

thirdparty/glew/README.md

@@ -0,0 +1,14 @@
+This directory contains the source code and includes for the GLEW library
+(https://github.com/nigels-com/glew). This library is normally dynamically
+linked to KiCad on all platforms, but wxWidgets 3.1.5+ on Linux requires
+GLEW compiled with EGL support and most distributions do not supply this
+(since compiling GLEW for EGL is mutually exclusive with GLEW for X11).
+
+The source files are generated from the GLEW repo, or can be pulled from
+a recent GLEW release.
+
+As of November 10, 2020 this GLEW version was pulled from its GitHub
+repository and is what should be version upstream version 2.2.0.
+
+This library is licensed under BSD and MIT licenses, with the actual
+license text given in the LICENSE file in this directory.

vcpkg-configuration.json

@@ -11,6 +11,7 @@
       "repository": "https://gitlab.com/kicad/packaging/kicad-vcpkg-registry.git",
       "baseline": "9c06375b6b62483d39ffe78e5fc2918365ee8ead",
       "packages": [
+        "glew",
         "python3",
         "opencascade",
         "wxpython",

vcpkg.json

@@ -19,7 +19,7 @@
     "boost-uuid",
     "cairo",
     "wxwidgets",
-    "libepoxy",
+    "glew",
     "curl",
     {
       "name": "gettext",