From 057a37df3e574aafd9440661d1c9d2b4d19de46c Mon Sep 17 00:00:00 2001
From: Vadim Lopatin <coolreader.org@gmail.com>
Date: Mon, 16 Mar 2015 11:48:00 +0300
Subject: [PATCH] Try creating OpenGL 2.1, 2.0 context if v3.2 context creation
 is failed

---
 src/dlangui/platforms/sdl/sdlapp.d | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/src/dlangui/platforms/sdl/sdlapp.d b/src/dlangui/platforms/sdl/sdlapp.d
index d9016227..3ec78bed 100644
--- a/src/dlangui/platforms/sdl/sdlapp.d
+++ b/src/dlangui/platforms/sdl/sdlapp.d
@@ -144,11 +144,28 @@ class SDLWindow : Window {
 		}
         version(USE_OPENGL) {
             if (_enableOpengl) {
+                Log.i("Trying to create OpenGL 3.2 context");
                 _context = SDL_GL_CreateContext(_win); // Create the actual context and make it current
                 if (!_context) {
-                    Log.e("SDL_GL_CreateContext failed: ", fromStringz(SDL_GetError()));
-                    _enableOpengl = false;
-                } else if (!_gl3Reloaded) {
+                    Log.e("SDL_GL_CreateContext failed for version 3.2: ", fromStringz(SDL_GetError()));
+                    Log.w("Trying to create OpenGL 2.1 context");
+                    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION,2);
+                    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION,1);
+                    _context = SDL_GL_CreateContext(_win); // Create the actual context and make it current
+                    if (!_context) {
+                        Log.e("SDL_GL_CreateContext failed: ", fromStringz(SDL_GetError()));
+                        Log.w("Trying to create OpenGL 2.0 context");
+                        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION,2);
+                        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION,0);
+                        _context = SDL_GL_CreateContext(_win); // Create the actual context and make it current
+                        if (!_context) {
+                            Log.e("SDL_GL_CreateContext failed: ", fromStringz(SDL_GetError()));
+                            _enableOpengl = false;
+                            Log.w("OpenGL support is disabled");
+                        }
+                    }
+                }
+                if (_context && !_gl3Reloaded) {
                     DerelictGL3.reload();
                     _gl3Reloaded = true;
                     if (!glSupport.valid && !glSupport.initShaders())
@@ -1387,7 +1404,7 @@ int sdlmain(string[] args) {
     int request = SDL_GetDesktopDisplayMode(0,&displayMode);
 
     version(USE_OPENGL) {
-        // we want OpenGL 3.3
+        // we want OpenGL 3.2
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION,3);
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION,2);
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);