gallium: Add context profile support to st_api.

Add struct st_context_attribs to describe context profiles and
attributes.  Modify st_api::create_context to take the new struct
instead of an st_visual.

st_context_attribs can be used to support GLX_ARB_create_context_profile
and GLX_EXT_create_context_es2_profile in the future.  But the
motivation for doing it now is to be able to replace ST_API_OPENGL_ES1
and ST_API_OPENGL_ES2 by profiles.

Having 3 st_api's to provide OpenGL, OpenGL ES 1.1, and OpenGL ES 2.0 is
not a sane abstraction, since all of them share glapi for current
context/dispatch management.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/mesa/main/version.c b/src/mesa/main/version.c
index d833a160e9e..9e1f5f2a4fe 100644
--- a/src/mesa/main/version.c
+++ b/src/mesa/main/version.c
@@ -260,11 +260,15 @@ compute_version_es2(GLcontext *ctx)
 
 /**
  * Set the context's VersionMajor, VersionMinor, VersionString fields.
- * This should only be called once as part of context initialization.
+ * This should only be called once as part of context initialization
+ * or to perform version check for GLX_ARB_create_context_profile.
  */
 void
 _mesa_compute_version(GLcontext *ctx)
 {
+   if (ctx->VersionMajor)
+      return;
+
    switch (ctx->API) {
    case API_OPENGL:
       compute_version(ctx);