add glew submodule

.gitmodules

@@ -13,3 +13,6 @@
 [submodule "modules/variant"]
 	path = modules/variant
 	url = https://github.com/mpark/variant
+[submodule "modules/glew"]
+	path = modules/glew
+	url = https://github.com/Perlmint/glew-cmake

CMakeLists.txt

@@ -101,6 +101,10 @@ set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
 set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
 add_subdirectory(modules/glfw)
 
+set(glew-cmake_BUILD_SHARED OFF CACHE BOOL "" FORCE)
+set(glew-cmake_BUILD_MULTI_CONTEXT OFF CACHE BOOL "" FORCE)
+add_subdirectory(modules/glew)
+
 #
 # e2d library target
 #
@@ -132,6 +136,7 @@ set_target_properties(${PROJECT_NAME} PROPERTIES
 set(E2D_LIBRARIES
     enduro2d
     glfw
+    libglew_static
     ${OPENGL_gl_LIBRARY}
     ${CMAKE_THREAD_LIBS_INIT})
 

headers/enduro2d/core/render.hpp

@@ -28,6 +28,17 @@ namespace e2d
     using vertex_buffer_ptr = std::shared_ptr<vertex_buffer>;
     using render_target_ptr = std::shared_ptr<render_target>;
 
+    //
+    // bad_render_operation
+    //
+
+    class bad_render_operation final : public exception {
+    public:
+        const char* what() const noexcept final {
+            return "bad render operation";
+        }
+    };
+
     //
     // pixel_declaration
     //

scripts/update_modules.sh

@@ -25,6 +25,9 @@ cp -fv $MODULES_DIR/catch2/single_include/catch2/catch.hpp $UNTESTS_DIR/catch/ca
 mkdir -p $SOURCES_RDPARTY_DIR/glfw
 cp -rfv $MODULES_DIR/glfw/include/GLFW/ $SOURCES_RDPARTY_DIR/glfw/
 
+mkdir -p $SOURCES_RDPARTY_DIR/glew
+cp -rfv $MODULES_DIR/glew/include/GL/ $SOURCES_RDPARTY_DIR/glew/
+
 mkdir -p $SOURCES_RDPARTY_DIR/stb
 cp -fv $MODULES_DIR/stb/stb_image.h $SOURCES_RDPARTY_DIR/stb/stb_image.h
 cp -fv $MODULES_DIR/stb/stb_image_resize.h $SOURCES_RDPARTY_DIR/stb/stb_image_resize.h

sources/enduro2d/core/render_impl/render_opengl.cpp

@@ -439,6 +439,9 @@ namespace e2d
 
     render::render(debug& debug, window& window)
     : state_(new internal_state(debug, window)) {
+        if ( glewInit() != GLEW_OK ) {
+            throw bad_render_operation();
+        }
         opengl::gl_trace_info(debug);
         opengl::gl_trace_limits(debug);
         GL_CHECK_CODE(state_->dbg(), glPixelStorei(GL_PACK_ALIGNMENT, 1));

sources/enduro2d/core/render_impl/render_opengl_base.hpp

@@ -11,6 +11,7 @@
 #if defined(E2D_RENDER_MODE) && E2D_RENDER_MODE == E2D_RENDER_MODE_OPENGL
 
 #if defined(E2D_PLATFORM) && E2D_PLATFORM == E2D_PLATFORM_MACOSX
+#  include <3rdparty/glew/glew.h>
 #  include <OpenGL/gl.h>
 #endif