Fixed bug 1565 - some small GL context creation enhancements

Matthias Bentrup 2012-08-09 12:53:17 PDT

With OpenGL 4.3 the ARB added a new context flag for context reset isolation
and renamed the existing ES2 profile bit to ES profile bit, as it can be used
to request GLES 3 compatible contexts, too.

This patch adds these changes to SDL on Linux and Windows.

Also SDL lacks the ability to create shared contexts. This patch also adds a
new GL attribute to enable context sharing. As casting a GL context to int is
not portable, I added only a boolean attribute
SDL_GL_SHARE_WITH_CURRENT_CONTEXT, which makes the new context share resources
with the context current on the creating thread.

include/SDL_video.h

@@ -185,13 +185,15 @@ typedef enum
     SDL_GL_CONTEXT_MINOR_VERSION,
     SDL_GL_CONTEXT_EGL,
     SDL_GL_CONTEXT_FLAGS,
-    SDL_GL_CONTEXT_PROFILE_MASK
+    SDL_GL_CONTEXT_PROFILE_MASK,
+    SDL_GL_SHARE_WITH_CURRENT_CONTEXT
 } SDL_GLattr;
 
 typedef enum
 {
     SDL_GL_CONTEXT_PROFILE_CORE           = 0x0001,
     SDL_GL_CONTEXT_PROFILE_COMPATIBILITY  = 0x0002,
+    SDL_GL_CONTEXT_PROFILE_ES             = 0x0004,
     SDL_GL_CONTEXT_PROFILE_ES2            = 0x0004
 } SDL_GLprofile;
 
@@ -199,7 +201,8 @@ typedef enum
 {
     SDL_GL_CONTEXT_DEBUG_FLAG              = 0x0001,
     SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG = 0x0002,
-    SDL_GL_CONTEXT_ROBUST_ACCESS_FLAG      = 0x0004
+    SDL_GL_CONTEXT_ROBUST_ACCESS_FLAG      = 0x0004,
+    SDL_GL_CONTEXT_RESET_ISOLATION_FLAG    = 0x0008
 } SDL_GLcontextFlag;