[gl3w] Initial port (#2561)

* [gl3w] Initial port

* [gl3w] Call python inside the portfile -- CMakeLists.txt simplification

ports/gl3w/0001-enable-shared-build.patch

@@ -0,0 +1,60 @@
+From 5f482a64c642f830f1d25f8abae7cae6dd2c6c2b Mon Sep 17 00:00:00 2001
+From: Stanislav Ershov <digital.stream.of.mind@gmail.com>
+Date: Mon, 8 Jan 2018 03:16:07 +0300
+Subject: [PATCH] enable shared build
+
+---
+ gl3w_gen.py | 18 ++++++++++++------
+ 1 file changed, 12 insertions(+), 6 deletions(-)
+
+diff --git a/gl3w_gen.py b/gl3w_gen.py
+index 611331a..3515cf9 100755
+--- a/gl3w_gen.py
++++ b/gl3w_gen.py
+@@ -130,6 +130,10 @@ with open(os.path.join(args.root, 'include/GL/gl3w.h'), 'wb') as f:
+ 
+ #include <GL/glcorearb.h>
+ 
++#ifndef GL3W_API
++    #define GL3W_API
++#endif
++
+ #ifndef __gl_h_
+ #define __gl_h_
+ #endif
+@@ -147,10 +151,10 @@ typedef void (*GL3WglProc)(void);
+ typedef GL3WglProc (*GL3WGetProcAddressProc)(const char *proc);
+ 
+ /* gl3w api */
+-int gl3wInit(void);
+-int gl3wInit2(GL3WGetProcAddressProc proc);
+-int gl3wIsSupported(int major, int minor);
+-GL3WglProc gl3wGetProcAddress(const char *proc);
++GL3W_API int gl3wInit(void);
++GL3W_API int gl3wInit2(GL3WGetProcAddressProc proc);
++GL3W_API int gl3wIsSupported(int major, int minor);
++GL3W_API GL3WglProc gl3wGetProcAddress(const char *proc);
+ 
+ /* gl3w internal state */
+ ''')
+@@ -162,7 +168,7 @@ GL3WglProc gl3wGetProcAddress(const char *proc);
+     write(f, r'''	} gl;
+ };
+ 
+-extern union GL3WProcs gl3wProcs;
++GL3W_API extern union GL3WProcs gl3wProcs;
+ 
+ /* OpenGL functions */
+ ''')
+@@ -329,7 +333,7 @@ static const char *proc_names[] = {
+         write(f, '\t"{0}",\n'.format(proc))
+     write(f, r'''};
+ 
+-union GL3WProcs gl3wProcs;
++GL3W_API union GL3WProcs gl3wProcs;
+ 
+ static void load_procs(GL3WGetProcAddressProc proc)
+ {
+-- 
+2.15.0.windows.1
+

ports/gl3w/CMakeLists.txt

@@ -0,0 +1,41 @@
+cmake_minimum_required(VERSION 3.9)
+project(gl3w C)
+
+set(HEADER_FILES
+    "include/GL/gl3w.h"
+    "include/GL/glcorearb.h"
+)
+
+find_package(OpenGL REQUIRED)
+
+add_library(gl3w src/gl3w.c)
+
+target_include_directories(gl3w PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:include>
+)
+
+if(BUILD_SHARED_LIBS)
+    target_compile_definitions(gl3w PRIVATE "-DGL3W_API=__declspec(dllexport)")
+endif()
+
+target_include_directories(gl3w PRIVATE ${OPENGL_INCLUDE_DIR})
+target_link_libraries(gl3w PRIVATE ${OPENGL_LIBRARIES})
+
+install(TARGETS gl3w
+    EXPORT gl3wExport
+    RUNTIME DESTINATION bin
+    LIBRARY DESTINATION lib
+    ARCHIVE DESTINATION lib
+)
+
+install(
+    EXPORT gl3wExport
+    FILE gl3wConfig.cmake
+    NAMESPACE unofficial::gl3w::
+    DESTINATION share/gl3w
+)
+
+if(NOT DISABLE_INSTALL_HEADERS)
+    install(DIRECTORY include/GL DESTINATION include)
+endif()

ports/gl3w/CONTROL

@@ -0,0 +1,3 @@
+Source: gl3w
+Version: 8f7f459d
+Description: Simple OpenGL core profile loading

ports/gl3w/portfile.cmake

@@ -0,0 +1,53 @@
+include(vcpkg_common_functions)
+
+vcpkg_from_github(
+  OUT_SOURCE_PATH SOURCE_PATH
+  REPO skaslev/gl3w
+  REF 8f7f459df8725c9614136b49a96023de276219f2
+  SHA512 7674008716accb25347c81f755f2db7a885ecb5c51b481e0e8f337bc8ee0949a5a58f5816b27a66535ed4da0b9438ba6a6a84712560c7b1a0f1b2908b4eb81e5
+  HEAD_REF master
+)
+
+file(COPY ${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt DESTINATION ${SOURCE_PATH})
+
+vcpkg_download_distfile(
+  GLCOREARB_H
+  URLS "http://www.opengl.org/registry/api/GL/glcorearb.h"
+  FILENAME "glcorearb-2018-02-27.h"
+  SHA512 02c3672606e6360f2e1e8335fe581bc2d2b3d518b0f24b0c327006a70de07261dace4b53b13e93029a8eb2af43bcba904c4392f2c35ac512c7f278534ef8eb5d
+)
+
+file(INSTALL ${GLCOREARB_H} DESTINATION ${SOURCE_PATH}/include/GL RENAME glcorearb.h)
+
+vcpkg_apply_patches(
+  SOURCE_PATH ${SOURCE_PATH}
+  PATCHES ${CMAKE_CURRENT_LIST_DIR}/0001-enable-shared-build.patch
+)
+
+vcpkg_find_acquire_program(PYTHON3)
+
+vcpkg_execute_required_process(
+  COMMAND ${PYTHON3} ${SOURCE_PATH}/gl3w_gen.py
+  WORKING_DIRECTORY ${SOURCE_PATH}
+  LOGNAME gl3w-gen
+)
+
+vcpkg_configure_cmake(
+  SOURCE_PATH ${SOURCE_PATH}
+  PREFER_NINJA
+  OPTIONS_DEBUG -DDISABLE_INSTALL_HEADERS=ON
+)
+
+vcpkg_install_cmake()
+vcpkg_copy_pdbs()
+
+vcpkg_fixup_cmake_targets(CONFIG_PATH share/gl3w)
+
+if(VCPKG_LIBRARY_LINKAGE STREQUAL "dynamic")
+  set(HEADER ${CURRENT_PACKAGES_DIR}/include/GL/gl3w.h)
+  file(READ ${HEADER} _contents)
+  string(REPLACE "#define GL3W_API" "#define GL3W_API __declspec(dllimport)" _contents "${_contents}")
+  file(WRITE ${HEADER} "${_contents}")
+endif()
+
+file(INSTALL ${SOURCE_PATH}/UNLICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/gl3w RENAME copyright)