change from glew to epoxy

because that works under wayland out of the box and gtk3 uses it already

Change-Id: Iefaac31e325534a81a5389f752804af917c1baef
Reviewed-on: https://gerrit.libreoffice.org/31213
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

18 files changed, 202 insertions, 223 deletions

diff --git a/external/Module_external.mk b/external/Module_external.mk
index 1dbf97b13265..c14e6680bbc3 100644
--- a/external/Module_external.mk
+++ b/external/Module_external.mk
@@ -38,13 +38,13 @@ $(eval $(call gb_Module_add_moduledirs,external,\
 	$(call gb_Helper_optional,CURL,curl) \
 	$(call gb_Helper_optional,EBOOK,libebook) \
 	$(call gb_Helper_optional,EPM,epm) \
+	$(call gb_Helper_optional,EPOXY,epoxy) \
 	$(call gb_Helper_optional,ETONYEK,libetonyek) \
 	$(call gb_Helper_optional,EXPAT,expat) \
 	$(call gb_Helper_optional,FIREBIRD,firebird) \
 	$(call gb_Helper_optional,FONTCONFIG,fontconfig) \
 	$(call gb_Helper_optional,FREEHAND,libfreehand) \
 	$(call gb_Helper_optional,FREETYPE,freetype) \
-	$(call gb_Helper_optional,GLEW,glew) \
 	$(call gb_Helper_optional,GLM,glm) \
 	$(call gb_Helper_optional,GRAPHITE,graphite) \
 	$(call gb_Helper_optional,HARFBUZZ,harfbuzz) \
diff --git a/external/epoxy/Library_epoxy.mk b/external/epoxy/Library_epoxy.mk
new file mode 100644
index 000000000000..28f9dab6b709
--- /dev/null
+++ b/external/epoxy/Library_epoxy.mk
@@ -0,0 +1,63 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_Library_Library,epoxy))
+
+$(eval $(call gb_Library_use_unpacked,epoxy,epoxy))
+
+$(eval $(call gb_Library_set_warnings_not_errors,epoxy))
+
+$(eval $(call gb_Library_set_include,epoxy,\
+	-I$(WORKDIR)/UnpackedTarball/epoxy/include \
+	-I$(WORKDIR)/UnpackedTarball/epoxy/src \
+	$$(INCLUDE) \
+))
+
+# epoxy is riddled with warnings... let's spare use
+# the pointless spamming
+$(eval $(call gb_Library_add_cxxflags,epoxy,\
+	-w \
+))
+$(eval $(call gb_Library_add_cflags,epoxy,\
+	-w \
+))
+
+ifeq ($(OS),LINUX)
+$(eval $(call gb_Library_add_libs,epoxy,\
+	-ldl \
+))
+endif
+
+$(eval $(call gb_Library_add_generated_cobjects,epoxy,\
+	UnpackedTarball/epoxy/src/dispatch_common \
+	UnpackedTarball/epoxy/src/gl_generated_dispatch \
+))
+
+ifeq ($(OS),WNT)
+$(eval $(call gb_Library_add_generated_cobjects,epoxy,\
+	UnpackedTarball/epoxy/src/dispatch_wgl \
+	UnpackedTarball/epoxy/src/wgl_generated_dispatch \
+))
+else ifeq ($(OS),MACOSX)
+# nothing
+else ifeq ($(OS),ANDROID)
+$(eval $(call gb_Library_add_generated_cobjects,epoxy,\
+	UnpackedTarball/epoxy/src/dispatch_egl \
+	UnpackedTarball/epoxy/src/egl_generated_dispatch \
+))
+else
+$(eval $(call gb_Library_add_generated_cobjects,epoxy,\
+	UnpackedTarball/epoxy/src/dispatch_glx \
+	UnpackedTarball/epoxy/src/glx_generated_dispatch \
+	UnpackedTarball/epoxy/src/dispatch_egl \
+	UnpackedTarball/epoxy/src/egl_generated_dispatch \
+))
+endif
+
+# vim: set noet sw=4 ts=4:
diff --git a/external/glew/Makefile b/external/epoxy/Makefile
index e4968cf85fb6..e4968cf85fb6 100644
--- a/external/glew/Makefile
+++ b/external/epoxy/Makefile
diff --git a/external/glew/Module_glew.mk b/external/epoxy/Module_epoxy.mk
index 1d1b9a7154aa..ea65176b85b3 100644
--- a/external/glew/Module_glew.mk
+++ b/external/epoxy/Module_epoxy.mk
@@ -7,12 +7,11 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 #
 
-$(eval $(call gb_Module_Module,glew))
+$(eval $(call gb_Module_Module,epoxy))
 
-$(eval $(call gb_Module_add_targets,glew,\
-	ExternalProject_glew \
-	UnpackedTarball_glew \
-	ExternalPackage_glew \
+$(eval $(call gb_Module_add_targets,epoxy,\
+	Library_epoxy \
+	UnpackedTarball_epoxy \
 ))
 
 # vim: set noet sw=4 ts=4:
diff --git a/external/epoxy/README b/external/epoxy/README
new file mode 100644
index 000000000000..8bd467af5c76
--- /dev/null
+++ b/external/epoxy/README
@@ -0,0 +1,5 @@
+Epoxy is an OpenGL Extension Wrangler
+
+Epoxy is a library for handling OpenGL function pointer management for you
+
+https://github.com/anholt/libepoxy
diff --git a/external/epoxy/UnpackedTarball_epoxy.mk b/external/epoxy/UnpackedTarball_epoxy.mk
new file mode 100644
index 000000000000..76c0fdf9cee9
--- /dev/null
+++ b/external/epoxy/UnpackedTarball_epoxy.mk
@@ -0,0 +1,20 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_UnpackedTarball_UnpackedTarball,epoxy))
+
+$(eval $(call gb_UnpackedTarball_set_tarball,epoxy,$(EPOXY_TARBALL)))
+
+$(eval $(call gb_UnpackedTarball_set_patchlevel,epoxy,0))
+
+$(eval $(call gb_UnpackedTarball_add_patches,epoxy, \
+    external/epoxy/epoxy.windows.api.patch \
+))
+
+# vim: set noet sw=4 ts=4:
diff --git a/external/epoxy/epoxy.windows.api.patch b/external/epoxy/epoxy.windows.api.patch
new file mode 100644
index 000000000000..12d2afb6a6ad
--- /dev/null
+++ b/external/epoxy/epoxy.windows.api.patch
@@ -0,0 +1,90 @@
+--- include/epoxy/gl.h
++++ include/epoxy/gl.h
+@@ -59,7 +59,8 @@
+ 
+ #else
+ #ifndef APIENTRY
+-#define APIENTRY __stdcall
++#define WINAPI __stdcall
++#define APIENTRY WINAPI
+ #endif
+ 
+ #ifndef GLAPIENTRY
+--- src/egl_generated_dispatch.c
++++ src/egl_generated_dispatch.c
+@@ -128,7 +128,11 @@
+ };
+ 
+ #if USING_DISPATCH_TABLE
++#if defined (_MSC_VER)
++static __inline struct dispatch_table *
++#else
+ static inline struct dispatch_table *
++#endif
+ get_dispatch_table(void);
+ 
+ #endif
+@@ -1642,7 +1646,11 @@
+ uint32_t egl_tls_index;
+ uint32_t egl_tls_size = sizeof(struct dispatch_table);
+ 
++#if defined (_MSC_VER)
++static __inline struct dispatch_table *
++#else
+ static inline struct dispatch_table *
++#endif
+ get_dispatch_table(void)
+ {
+ 	return TlsGetValue(egl_tls_index);
+--- src/gl_generated_dispatch.c
++++ src/gl_generated_dispatch.c
+@@ -3122,7 +3122,11 @@
+ };
+ 
+ #if USING_DISPATCH_TABLE
++#if defined (_MSC_VER)
++static __inline struct dispatch_table *
++#else
+ static inline struct dispatch_table *
++#endif
+ get_dispatch_table(void);
+ 
+ #endif
+@@ -51507,7 +51511,11 @@
+ uint32_t gl_tls_index;
+ uint32_t gl_tls_size = sizeof(struct dispatch_table);
+ 
++#if defined (_MSC_VER)
++static __inline struct dispatch_table *
++#else
+ static inline struct dispatch_table *
++#endif
+ get_dispatch_table(void)
+ {
+ 	return TlsGetValue(gl_tls_index);
+--- src/wgl_generated_dispatch.c
++++ src/wgl_generated_dispatch.c
+@@ -157,7 +157,11 @@
+ };
+ 
+ #if USING_DISPATCH_TABLE
++#if defined (_MSC_VER)
++static __inline struct dispatch_table *
++#else
+ static inline struct dispatch_table *
++#endif
+ get_dispatch_table(void);
+ 
+ #endif
+@@ -1701,7 +1705,11 @@
+ uint32_t wgl_tls_index;
+ uint32_t wgl_tls_size = sizeof(struct dispatch_table);
+ 
++#if defined (_MSC_VER)
++static __inline struct dispatch_table *
++#else
+ static inline struct dispatch_table *
++#endif
+ get_dispatch_table(void)
+ {
+ 	return TlsGetValue(wgl_tls_index);
diff --git a/external/glew/ExternalPackage_glew.mk b/external/glew/ExternalPackage_glew.mk
deleted file mode 100644
index e6adc8b6ce26..000000000000
--- a/external/glew/ExternalPackage_glew.mk
+++ /dev/null
@@ -1,33 +0,0 @@
-# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
-#
-# This file is part of the LibreOffice project.
-#
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-#
-
-$(eval $(call gb_ExternalPackage_ExternalPackage,glew,glew))
-
-$(eval $(call gb_ExternalPackage_use_external_project,glew,glew))
-
-ifeq ($(OS)-$(COM),WNT-MSC)
-ifeq ($(CPUNAME),INTEL)
-glew_arch_subdir=Win32
-else ifeq ($(CPUNAME),X86_64)
-glew_arch_subdir=x64
-endif
-endif
-
-ifeq ($(OS),MACOSX)
-$(eval $(call gb_ExternalPackage_add_file,glew,$(LIBO_LIB_FOLDER)/libGLEW.1.12.0.dylib,lib/libGLEW.1.12.0.dylib))
-else ifeq ($(OS)-$(COM),WNT-GCC)
-else ifeq ($(COM),MSC)
-$(eval $(call gb_ExternalPackage_add_files,glew,$(LIBO_LIB_FOLDER), \
-	bin/$(if $(MSVC_USE_DEBUG_RUNTIME),Debug/$(glew_arch_subdir)/glew32d.dll,Release/$(glew_arch_subdir)/glew32.dll) \
-))
-else ifeq ($(DISABLE_DYNLOADING),)
-$(eval $(call gb_ExternalPackage_add_file,glew,$(LIBO_LIB_FOLDER)/libGLEW.so.1.12,lib/libGLEW.so.1.12.0))
-endif
-
-# vim: set noet sw=4 ts=4:
diff --git a/external/glew/ExternalProject_glew.mk b/external/glew/ExternalProject_glew.mk
deleted file mode 100644
index 0d80cd03bd33..000000000000
--- a/external/glew/ExternalProject_glew.mk
+++ /dev/null
@@ -1,36 +0,0 @@
-# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
-#
-# This file is part of the LibreOffice project.
-#
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-#
-
-$(eval $(call gb_ExternalProject_ExternalProject,glew))
-
-$(eval $(call gb_ExternalProject_register_targets,glew,\
-	build \
-))
-
-ifeq ($(COM),MSC)
-$(call gb_ExternalProject_get_state_target,glew,build) :
-	$(call gb_ExternalProject_run,build,\
-		$(if $(filter 140,$(VCVER)),$(DEVENV) /Upgrade glew.sln,echo up-to-date) && \
-		msbuild.exe glew_shared.vcxproj /p:Platform=$(if $(filter INTEL,$(CPUNAME)),Win32,x64) /p:Configuration=$(if $(MSVC_USE_DEBUG_RUNTIME),Debug,Release) $(if $(filter 140,$(VCVER)),/p:PlatformToolset=v140,/p:PlatformToolset=v120) \
-	,build/vc12) \
-	$(call gb_ExternalProject_run,build,\
-		msbuild.exe glewinfo.vcxproj /p:Platform=$(if $(filter INTEL,$(CPUNAME)),Win32,x64) /p:Configuration=Release $(if $(filter 140,$(VCVER)),/p:PlatformToolset=v140,/p:PlatformToolset=v120) \
-	,build/vc12)
-
-else
-
-$(call gb_ExternalProject_get_state_target,glew,build) :
-	$(call gb_ExternalProject_run,glew,\
-		$(if $(ENABLE_DEBUG),STRIP=) LD="$(CC)" \
-			$(MAKE) STRIP= glew.lib $(if $(filter DESKTOP,$(BUILD_TYPE)),$(if $(ENABLE_DEBUG),debug)) \
-	)
-
-endif
-
-# vim: set noet sw=4 ts=4:
diff --git a/external/glew/README b/external/glew/README
deleted file mode 100644
index 34b2d249401c..000000000000
--- a/external/glew/README
+++ /dev/null
@@ -1,6 +0,0 @@
-GLEW is the OpenGL Extension Wrangler
-
-GLEW provides efficient run-time mechanisms for determining which OpenGL
-extensions are supported on the target platform.
-
-http://glew.sourceforge.net/
diff --git a/external/glew/UnpackedTarball_glew.mk b/external/glew/UnpackedTarball_glew.mk
deleted file mode 100644
index c47b7a07e2ad..000000000000
--- a/external/glew/UnpackedTarball_glew.mk
+++ /dev/null
@@ -1,48 +0,0 @@
-# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
-#
-# This file is part of the LibreOffice project.
-#
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-#
-
-$(eval $(call gb_UnpackedTarball_UnpackedTarball,glew))
-
-$(eval $(call gb_UnpackedTarball_set_tarball,glew,$(GLEW_TARBALL)))
-
-$(eval $(call gb_UnpackedTarball_set_patchlevel,glew,0))
-
-$(eval $(call gb_UnpackedTarball_fix_end_of_line,glew,\
-	Makefile \
-	include/GL/glew.h \
-))
-
-ifeq ($(OS)$(COM),WNTMSC)
-$(eval $(call gb_UnpackedTarball_set_patchflags,glew,--binary))
-$(eval $(call gb_UnpackedTarball_add_patches,glew,\
-	external/glew/glew-msvc-disable-sse2.patch.1 \
-))
-else
-$(eval $(call gb_UnpackedTarball_add_patches,glew,\
-	external/glew/glew_use_CC_variable.patch.1 \
-))
-endif
-
-ifeq ($(OS),MACOSX)
-$(eval $(call gb_UnpackedTarball_add_patches,glew,\
-	external/glew/glew-macosx-install-name.patch.1 \
-))
-endif
-
-ifeq ($(DISABLE_DYNLOADING),TRUE)
-$(eval $(call gb_UnpackedTarball_add_patches,glew,\
-	external/glew/glew-static-only.patch.1 \
-))
-endif
-
-$(eval $(call gb_UnpackedTarball_add_patches,glew,\
-	external/glew/glew-tmpdir.patch.1 \
-))
-
-# vim: set noet sw=4 ts=4:
diff --git a/external/glew/glew-macosx-install-name.patch.1 b/external/glew/glew-macosx-install-name.patch.1
deleted file mode 100644
index 75e8e7f1a178..000000000000
--- a/external/glew/glew-macosx-install-name.patch.1
+++ /dev/null
@@ -1,13 +0,0 @@
--*- Mode:Diff -*-
-diff -ur glew.org/build/glew.rc glew/build/glew.rc
---- glew/config/Makefile.darwin
-+++ glew/config/Makefile.darwin
-@@ -20,7 +20,7 @@
- LIB.DEVLNK    = lib$(NAME).dylib
- LIB.SHARED    = lib$(NAME).$(SO_VERSION).dylib
- LIB.STATIC    = lib$(NAME).a
--LDFLAGS.SO    = -dynamiclib -install_name $(GLEW_DEST)/lib/$(LIB.SHARED) -current_version $(SO_VERSION) -compatibility_version $(SO_MAJOR)
-+LDFLAGS.SO    = -dynamiclib -install_name @__________________________________________________OOO/$(LIB.SHARED) -current_version $(SO_VERSION) -compatibility_version $(SO_MAJOR)
- LIB.SONAME.MX = lib$(NAME)mx.$(SO_MAJOR).dylib
- LIB.DEVLNK.MX = lib$(NAME)mx.dylib
- LIB.SHARED.MX = lib$(NAME)mx.$(SO_VERSION).dylib
diff --git a/external/glew/glew-msvc-disable-sse2.patch.1 b/external/glew/glew-msvc-disable-sse2.patch.1
deleted file mode 100644
index 6b07044f5507..000000000000
--- a/external/glew/glew-msvc-disable-sse2.patch.1
+++ /dev/null
@@ -1,10 +0,0 @@
---- glew/build//vc10/common.props.orig	2014-10-02 15:06:57.027060664 +0200
-+++ glew/build//vc10/common.props	2014-10-02 15:06:59.026060509 +0200
-@@ -10,6 +10,7 @@
-   <ItemDefinitionGroup>
-     <ClCompile>
-       <AdditionalIncludeDirectories>$(INCLUDE_DIR)</AdditionalIncludeDirectories>
-+      <EnableEnhancedInstructionSet>StreamingSIMDExtensions</EnableEnhancedInstructionSet>
-     </ClCompile>
-   </ItemDefinitionGroup>
-   <ItemGroup>
diff --git a/external/glew/glew-static-only.patch.1 b/external/glew/glew-static-only.patch.1
deleted file mode 100644
index 14ccff23a6be..000000000000
--- a/external/glew/glew-static-only.patch.1
+++ /dev/null
@@ -1,12 +0,0 @@
--*- Mode:Diff -*-
---- glew/Makefile
-+++ glew/Makefile
-@@ -93,7 +93,7 @@
- LIB.SOBJS.MX       := $(addprefix tmp/$(SYSTEM)/mx/shared/,$(LIB.SRCS.NAMES))
- LIB.SOBJS.MX       := $(LIB.SOBJS.MX:.c=.o)
- 
--glew.lib: lib lib/$(LIB.SHARED) lib/$(LIB.STATIC) glew.pc
-+glew.lib: lib lib/$(LIB.STATIC)
- 
- lib:
- 	mkdir lib
diff --git a/external/glew/glew-tmpdir.patch.1 b/external/glew/glew-tmpdir.patch.1
deleted file mode 100644
index 9a2847ba279a..000000000000
--- a/external/glew/glew-tmpdir.patch.1
+++ /dev/null
@@ -1,13 +0,0 @@
-diff -ur glew.org/Makefile glew/Makefile
---- glew.org/Makefile	2016-05-02 06:25:53.521291677 +0200
-+++ glew/Makefile	2016-05-02 06:31:10.325035494 +0200
-@@ -55,7 +55,8 @@
- DIST_SRC_TGZ ?= $(shell pwd)/$(DIST_NAME).tgz
- DIST_WIN32   ?= $(shell pwd)/$(DIST_NAME)-win32.zip
- 
--DIST_DIR := $(shell mktemp -d /tmp/glew.XXXXXX)/$(DIST_NAME)
-+TMPDIR ?= /tmp
-+DIST_DIR := $(shell mktemp -d $(TMPDIR)/glew.XXXXXX)/$(DIST_NAME)
- 
- # To disable stripping of binaries either:
- #   - use STRIP= on gmake command-line
diff --git a/external/glew/glew_use_CC_variable.patch.1 b/external/glew/glew_use_CC_variable.patch.1
deleted file mode 100644
index 56e9903d937b..000000000000
--- a/external/glew/glew_use_CC_variable.patch.1
+++ /dev/null
@@ -1,24 +0,0 @@
-Use CC variable from environment, don't hardcode "cc".
-
---- glew/config/Makefile.linux.orig	2014-01-29 15:39:43.364972925 +0100
-+++ glew/config/Makefile.linux	2014-01-29 15:44:45.621000941 +0100
-@@ -1,6 +1,6 @@
- NAME = $(GLEW_NAME)
--CC = cc
--LD = cc
-+CC ?= cc
-+LD ?= $(CC)
- M_ARCH ?= $(shell uname -m)
- ARCH64 = false
- ifeq (x86_64,${M_ARCH})
---- glew/config/Makefile.darwin.orig	2014-01-29 15:44:39.541000377 +0100
-+++ glew/config/Makefile.darwin	2014-01-29 15:44:47.548001120 +0100
-@@ -1,6 +1,6 @@
- NAME = $(GLEW_NAME)
--CC = cc
--LD = cc
-+CC ?= cc
-+LD ?= $(CC)
- CFLAGS.EXTRA = -dynamic -fno-common
- #CFLAGS.EXTRA += -no-cpp-precomp
- LDFLAGS.EXTRA =
diff --git a/external/libgltf/ExternalProject_libgltf.mk b/external/libgltf/ExternalProject_libgltf.mk
index 57c01d048208..90a1d967ac27 100644
--- a/external/libgltf/ExternalProject_libgltf.mk
+++ b/external/libgltf/ExternalProject_libgltf.mk
@@ -17,7 +17,7 @@ $(eval $(call gb_ExternalProject_register_targets,libgltf,\
 
 $(eval $(call gb_ExternalProject_use_externals,libgltf,\
 	boost_headers \
-	glew \
+	epoxy \
 	glm_headers \
 ))
 
@@ -30,8 +30,8 @@ ifeq ($(SYSTEM_BOOST),)
 libgltf_AdditionalIncludes += "$(call gb_UnpackedTarball_get_dir,boost)"
 endif
 
-ifeq ($(SYSTEM_GLEW),)
-libgltf_AdditionalIncludes += "$(call gb_UnpackedTarball_get_dir,glew)/include"
+ifeq ($(SYSTEM_EPOXY),)
+libgltf_AdditionalIncludes += "$(call gb_UnpackedTarball_get_dir,epoxy)/include"
 endif
 
 ifeq ($(SYSTEM_GLM),)
@@ -45,7 +45,7 @@ $(call gb_ExternalProject_get_state_target,libgltf,build) :
 			$(if $(filter 120,$(VCVER)),/p:PlatformToolset=v120 /p:VisualStudioVersion=12.0 /ToolsVersion:12.0) \
 			$(if $(filter 140,$(VCVER)),/p:PlatformToolset=v140 /p:VisualStudioVersion=14.0 /ToolsVersion:14.0) \
 			'/p:AdditionalIncludeDirectories=$(subst $(WHITESPACE),;,$(subst /,\,$(strip $(libgltf_AdditionalIncludes))))' \
-			/p:AdditionalLibraryDirectories=$(if $(SYSTEM_GLEW),,"$(subst /,\,$(call gb_UnpackedTarball_get_dir,glew))\lib\$(if $(MSVC_USE_DEBUG_RUNTIME),Debug,Release)\Win32") \
+			/p:AdditionalLibraryDirectories=$(if $(SYSTEM_EPOXY),,"$(subst /,\,$(call gb_UnpackedTarball_get_dir,epoxy))\lib\$(if $(MSVC_USE_DEBUG_RUNTIME),Debug,Release)\Win32") \
 	,build/win32)
 
 else # !ifeq($(COM),MSC)
@@ -67,7 +67,7 @@ $(call gb_ExternalProject_get_state_target,libgltf,build) :
 			$(if $(ENABLE_DEBUG),--enable-debug,--disable-debug) \
 			--disable-werror \
 			BOOST_CFLAGS="$(BOOST_CPPFLAGS)" \
-			GLEW_CFLAGS="$(if $(SYSTEM_GLEW),$(GLEW_CFLAGS),-I$(call gb_UnpackedTarball_get_dir,glew)/include) -DGLEW_NO_GLU" \
+			EPOXY_CFLAGS="$(if $(SYSTEM_EPOXY),$(EPOXY_CFLAGS),-I$(call gb_UnpackedTarball_get_dir,epoxy)/include)" \
 			GLM_CFLAGS="$(if $(SYSTEM_GLM),$(GLM_CFLAGS),-I$(call gb_UnpackedTarball_get_dir,glm))" \
 			$(if $(libgltf_CPPFLAGS),CPPFLAGS='$(libgltf_CPPFLAGS)') \
 		&& $(MAKE) \
diff --git a/external/libgltf/libgltf-msvc-x64.patch.1 b/external/libgltf/libgltf-msvc-x64.patch.1
index 86417a752605..32a831bebd5c 100644
--- a/external/libgltf/libgltf-msvc-x64.patch.1
+++ b/external/libgltf/libgltf-msvc-x64.patch.1
@@ -20,7 +20,7 @@ diff -ur libgltf.org/build/win32/libgltf.vcxproj libgltf/build/win32/libgltf.vcx
    </ItemGroup>
    <ItemGroup>
      <ClInclude Include="..\..\inc\libgltf.h" />
-@@ -56,6 +64,12 @@
+@@ -53,6 +61,12 @@
      <CharacterSet>MultiByte</CharacterSet>
      <PlatformToolset>v110</PlatformToolset>
    </PropertyGroup>
@@ -33,7 +33,7 @@ diff -ur libgltf.org/build/win32/libgltf.vcxproj libgltf/build/win32/libgltf.vcx
    <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
      <ConfigurationType>StaticLibrary</ConfigurationType>
      <UseDebugLibraries>false</UseDebugLibraries>
-@@ -63,15 +77,28 @@
+@@ -60,15 +74,28 @@
      <CharacterSet>MultiByte</CharacterSet>
      <PlatformToolset>v110</PlatformToolset>
    </PropertyGroup>
@@ -62,8 +62,8 @@ diff -ur libgltf.org/build/win32/libgltf.vcxproj libgltf/build/win32/libgltf.vcx
    <PropertyGroup Label="UserMacros" />
    <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
      <ClCompile>
-@@ -86,6 +113,19 @@
-       <AdditionalDependencies>opengl32.lib;glew32.lib;$(AdditionalDependencies)</AdditionalDependencies>
+@@ -83,10 +110,42 @@
+       <AdditionalDependencies>opengl32.lib;epoxy32.lib;$(AdditionalDependencies)</AdditionalDependencies>
      </Link>
    </ItemDefinitionGroup>
 +  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
@@ -76,20 +76,13 @@ diff -ur libgltf.org/build/win32/libgltf.vcxproj libgltf/build/win32/libgltf.vcx
 +    <Link>
 +      <GenerateDebugInformation>true</GenerateDebugInformation>
 +      <AdditionalLibraryDirectories>$(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
-+      <AdditionalDependencies>opengl32.lib;glew32.lib;$(AdditionalDependencies)</AdditionalDependencies>
++      <AdditionalDependencies>opengl32.lib;epoxy32.lib;$(AdditionalDependencies)</AdditionalDependencies>
 +    </Link>
 +  </ItemDefinitionGroup>
    <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
      <ClCompile>
        <WarningLevel>Level4</WarningLevel>
-@@ -105,6 +145,25 @@
-       <SubSystem>Windows</SubSystem>
-     </Link>
-   </ItemDefinitionGroup>
-+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
-+    <ClCompile>
-+      <WarningLevel>Level4</WarningLevel>
-+      <Optimization>MaxSpeed</Optimization>
+       <Optimization>MaxSpeed</Optimization>
 +      <EnableEnhancedInstructionSet>StreamingSIMDExtensions</EnableEnhancedInstructionSet>
 +      <FunctionLevelLinking>true</FunctionLevelLinking>
 +      <IntrinsicFunctions>true</IntrinsicFunctions>
@@ -101,10 +94,14 @@ diff -ur libgltf.org/build/win32/libgltf.vcxproj libgltf/build/win32/libgltf.vcx
 +      <EnableCOMDATFolding>true</EnableCOMDATFolding>
 +      <OptimizeReferences>true</OptimizeReferences>
 +      <AdditionalLibraryDirectories>$(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
-+      <AdditionalDependencies>opengl32.lib;glew32.lib;$(AdditionalDependencies)</AdditionalDependencies>
++      <AdditionalDependencies>opengl32.lib;epoxy32.lib;$(AdditionalDependencies)</AdditionalDependencies>
 +      <SubSystem>Windows</SubSystem>
 +    </Link>
 +  </ItemDefinitionGroup>
-   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
-   <ImportGroup Label="ExtensionTargets">
-   </ImportGroup>
++  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
++    <ClCompile>
++      <WarningLevel>Level4</WarningLevel>
++      <Optimization>MaxSpeed</Optimization>
+       <EnableEnhancedInstructionSet>StreamingSIMDExtensions</EnableEnhancedInstructionSet>
+       <FunctionLevelLinking>true</FunctionLevelLinking>
+       <IntrinsicFunctions>true</IntrinsicFunctions>