allowing the user to require an opengl version.

default is 4.3

include/scigl_render/gl_context.hpp

@@ -15,7 +15,8 @@ The copy constructor is deleted, use a shard_ptr.
 class GLContext
 {
 public:
-  GLContext(bool visible, bool fullscreen, int width, int height);
+  GLContext(bool visible, bool fullscreen, int width, int height,
+            int version_major = 4, int version_minor = 3);
   GLContext(const GLContext &) = delete;
   ~GLContext();
 

src/gl_context.cpp

@@ -6,13 +6,14 @@
 
 namespace scigl_render
 {
-GLContext::GLContext(bool visible, bool fullscreen, int width, int height)
+GLContext::GLContext(bool visible, bool fullscreen, int width, int height,
+                     int version_major, int version_minor)
     : width(width), height(height)
 {
   glfwInit();
   // compability requirements
-  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
-  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, version_major);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, version_minor);
   glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
   glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
   glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
@@ -39,9 +40,10 @@ GLContext::GLContext(bool visible, bool fullscreen, int width, int height)
   {
     throw std::runtime_error("Failed to initialize OpenGL");
   }
-  if (!gl3wIsSupported(4, 2))
+  if (!gl3wIsSupported(version_major, version_minor))
   {
-    throw std::runtime_error("OpenGL 4.2 not supported");
+    throw std::runtime_error("OpenGL " + std::to_string(version_major) + "." +
+                             std::to_string(version_minor) + " not supported");
   }
   std::cout << "OpenGL Version: " << glGetString(GL_VERSION)
             << " GLSL Version: " << glGetString(GL_SHADING_LANGUAGE_VERSION)