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, 61 insertions, 2 deletions

diff --git a/src/gallium/include/state_tracker/st_api.h b/src/gallium/include/state_tracker/st_api.h
index 1142461188..9e87c8e0d4 100644
--- a/src/gallium/include/state_tracker/st_api.h
+++ b/src/gallium/include/state_tracker/st_api.h
@@ -55,6 +55,23 @@ enum st_api_type {
 };
 
 /**
+ * The profile of a context.
+ */
+enum st_profile_type
+{
+   ST_PROFILE_DEFAULT,
+   ST_PROFILE_OPENGL_CORE,
+   ST_PROFILE_OPENGL_ES1,
+   ST_PROFILE_OPENGL_ES2
+};
+
+/* for profile_mask in st_api */
+#define ST_PROFILE_DEFAULT_MASK      (1 << ST_PROFILE_DEFAULT)
+#define ST_PROFILE_OPENGL_CORE_MASK  (1 << ST_PROFILE_OPENGL_CORE)
+#define ST_PROFILE_OPENGL_ES1_MASK   (1 << ST_PROFILE_OPENGL_ES1)
+#define ST_PROFILE_OPENGL_ES2_MASK   (1 << ST_PROFILE_OPENGL_ES2)
+
+/**
  * Used in st_context_iface->teximage.
  */
 enum st_texture_type {
@@ -180,6 +197,37 @@ struct st_visual
 };
 
 /**
+ * Represent the attributes of a context.
+ */
+struct st_context_attribs
+{
+   /**
+    * The profile and minimal version to support.
+    *
+    * The valid profiles and versions are rendering API dependent.  The latest
+    * version satisfying the request should be returned, unless
+    * forward_compatiible is true.
+    */
+   enum st_profile_type profile;
+   int major, minor;
+
+   /**
+    * Enable debugging.
+    */
+   boolean debug;
+
+   /**
+    * Return the exact version and disallow the use of deprecated features.
+    */
+   boolean forward_compatible;
+
+   /**
+    * The visual of the framebuffers the context will be bound to.
+    */
+   struct st_visual visual;
+};
+
+/**
  * Represent a windowing system drawable.
  *
  * The framebuffer is implemented by the state tracker manager and
@@ -357,6 +405,16 @@ struct st_manager
 struct st_api
 {
    /**
+    * The supported rendering API.
+    */
+   enum st_api_type api;
+
+   /**
+    * The supported profiles.  Tested with ST_PROFILE_*_MASK.
+    */
+   unsigned profile_mask;
+
+   /**
     * Destroy the API.
     */
    void (*destroy)(struct st_api *stapi);
@@ -373,13 +431,14 @@ struct st_api
     */
    struct st_context_iface *(*create_context)(struct st_api *stapi,
                                               struct st_manager *smapi,
-                                              const struct st_visual *visual,
+                                              const struct st_context_attribs *attribs,
                                               struct st_context_iface *stsharei);
 
    /**
     * Bind the context to the calling thread with draw and read as drawables.
     *
-    * The framebuffers might have different visuals than the context does.
+    * The framebuffers might be NULL, or might have different visuals than the
+    * context does.
     */
    boolean (*make_current)(struct st_api *stapi,
                            struct st_context_iface *stctxi,