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Date: Sun, 22 Mar 2009 12:52:29 +0000

From: Luke Benstead
Subject: OpenGL 3.0 Context Creation

I've attached a patch which implements OpenGL 3.x context creation on
the latest SVN. I've added two options to SDL_GL_SetAttribute, these
are SDL_GL_CONTEXT_MAJOR_VERSION and SDL_GL_CONTEXT_MINOR_VERSION.
These default to 2 and 1 respectively. If the major version is less
than 3 then the current context creation method is used, otherwise the
appropriate new context creation function is called (depending on the
platform).

Sample code:

    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
        printf("Unable to initialize SDL: %s\n", SDL_GetError());
        return 1;
    }

    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3); //Without these 2 lines, SDL will create a GL 2.x context
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

    SDL_Surface* screen = SDL_SetVideoMode( 640, 480, 16, SDL_OPENGL | SDL_FULLSCREEN );


I've implemented context creation on both Win32 and X and run basic
tests on both. This patch doesn't provide access to all the options
allowed by the new context creation (e.g. shared contexts, forward
compatible contexts) but they can be added pretty easily.
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slouken committed Mar 24, 2009
1 parent 00f5d0d commit 17e80064984a0a268c0823ada22a195c6f2da3c3

File 3 of 5 in 17e8006

@@ -257,6 +257,8 @@ SDL_VideoInit(const char *driver_name, Uint32 flags)
_this->gl_config.multisamplesamples = 0;
_this->gl_config.retained_backing = 1;
_this->gl_config.accelerated = -1; /* not known, don't set */
_this->gl_config.major_version = 2;
_this->gl_config.minor_version = 1;

/* Initialize the video subsystem */
if (_this->VideoInit(_this) < 0) {
@@ -2694,6 +2696,12 @@ SDL_GL_SetAttribute(SDL_GLattr attr, int value)
case SDL_GL_RETAINED_BACKING:
_this->gl_config.retained_backing = value;
break;
case SDL_GL_CONTEXT_MAJOR_VERSION:
_this->gl_config.major_version = value;
break;
case SDL_GL_CONTEXT_MINOR_VERSION:
_this->gl_config.minor_version = value;
break;
default:
SDL_SetError("Unknown OpenGL attribute");
retval = -1;

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