Dgame revived

[Mike Parker via Digitalmars-d-announce]

On 2/23/2015 4:01 PM, Namespace wrote:
>> On OSX you can load either "legacy" version of OpenGL so 1.x/2.x or
>> 3.x+. Not both. I found this out for Devisualization.Window. Most
>> likely dgame by default is loading it in legacy mode.
>
> Derelict GL is loading in legacy mode. You have to call 'reload' after
> creating a valid GL Context to update your OpenGL to the highest
> possible version. Maybe that doesn't work on Mac?

load will pull in 1.1 functions only, nothing more. reload will load in 
whatever is supported by the current context. So if your context only 
supports 2.1, only functions up to 2.1 will be loaded. One of the 
earlier posts showed what needs to be done on Mac to get a 3.x context. 
In SDL, that means the following:

```
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, 
SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 
SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);
```