In OpenGL context creation add support for compatability context.

1 files changed, 28 insertions, 13 deletions

diff --git a/src/utils/sdl2helper.cpp b/src/utils/sdl2helper.cpp
index 07f8d965c..6de5ef357 100644
--- a/src/utils/sdl2helper.cpp
+++ b/src/utils/sdl2helper.cpp
@@ -96,33 +96,48 @@ SDL_Thread *SDL::createThread(SDL_ThreadFunction fn,
 
 void *SDL::createGLContext(SDL_Window *const window,
                            const int major,
-                           const int minor)
+                           const int minor,
+                           const int profile)
 {
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, major);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, minor);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK,
-        SDL_GL_CONTEXT_PROFILE_CORE);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, profile);
 //    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);
     SDL_ClearError();
     void *context = SDL_GL_CreateContext(window);
-    if (SDL_GetError())
+    if (SDL_GetError() && (major > 3 || (major == 3 && minor > 3)))
     {
-        if (!context && (major > 3 || (major == 3 && minor > 3)))
+        logger->log("Try fallback to OpenGL 3.3 core context");
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
+        SDL_ClearError();
+        context = SDL_GL_CreateContext(window);
+        if (SDL_GetError() && profile == 0x01)
         {
-            logger->log("Try fallback to OpenGL 3.3 context");
+            logger->log("Try fallback to OpenGL 3.3 compatibility context");
             SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
             SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
+            SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, 0x02);
             SDL_ClearError();
             context = SDL_GL_CreateContext(window);
-            if (SDL_GetError())
-            {
-                logger->log("Try fallback to OpenGL 3.0 context");
-                SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
-                SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
-                context = SDL_GL_CreateContext(window);
-            }
         }
     }
+    if (SDL_GetError() && (major > 3 || (major == 3 && minor > 0)))
+    {
+        logger->log("Try fallback to OpenGL 3.0 core context");
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, profile);
+        context = SDL_GL_CreateContext(window);
+    }
+    if (SDL_GetError() && (major > 2 || (major == 2 && minor > 1)))
+    {
+        logger->log("Try fallback to OpenGL 2.1 compatibility context");
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, 0x02);
+        context = SDL_GL_CreateContext(window);
+    }
     return context;
 }