egl: Check if API is supported when using eglBindAPI.

According to the EGL specifications before binding an API
we must check whether it's supported first. If not eglBindAPI
should return EGL_FALSE and generate a EGL_BAD_PARAMETER error.

Signed-off-by: Plamena Manolova <plamena.manolova@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/src/egl/main/eglapi.c b/src/egl/main/eglapi.c
index 4700dbe..4ef0a27 100644
--- a/src/egl/main/eglapi.c
+++ b/src/egl/main/eglapi.c
@@ -1196,6 +1196,61 @@ eglGetError(void)
 }
 
 
+static bool
+_eglDisplaySupportsApi(_EGLDisplay *dpy, EGLenum api)
+{
+   if (!dpy->Initialized) {
+      return false;
+   }
+
+   switch (api) {
+   case EGL_OPENGL_API:
+      return !!(dpy->ClientAPIs & EGL_OPENGL_BIT);
+   case EGL_OPENGL_ES_API:
+      return dpy->ClientAPIs & EGL_OPENGL_ES_BIT ||
+             dpy->ClientAPIs & EGL_OPENGL_ES2_BIT ||
+             dpy->ClientAPIs & EGL_OPENGL_ES3_BIT_KHR;
+   case EGL_OPENVG_API:
+      return !!(dpy->ClientAPIs & EGL_OPENVG_BIT);
+   }
+
+   return false;
+}
+
+
+/**
+ * Return true if a client API enum is recognized.
+ */
+static bool
+_eglIsApiValid(EGLenum api)
+{
+   _EGLDisplay *dpy = _eglGlobal.DisplayList;
+   _EGLThreadInfo *current_thread = _eglGetCurrentThread();
+
+   if (api != EGL_OPENGL_API && api != EGL_OPENGL_ES_API &&
+       api != EGL_OPENVG_API) {
+      return false;
+   }
+
+   while (dpy) {
+      _EGLThreadInfo *thread = dpy->ThreadList;
+
+      while (thread) {
+         if (thread == current_thread) {
+            if (_eglDisplaySupportsApi(dpy, api))
+               return true;
+         }
+
+         thread = thread->Next;
+      }
+
+      dpy = dpy->Next;
+   }
+
+   return false;
+}
+
+
 /**
  ** EGL 1.2
  **/
@@ -1211,6 +1266,16 @@ eglGetError(void)
  *  eglWaitNative()
  * See section 3.7 "Rendering Context" in the EGL specification for details.
  */
+
+ /**
+  * Section 3.7 (Rendering Contexts) of the EGL 1.5 spec says:
+  *
+  * "api must specify one of the supported client APIs, either
+  * EGL_OPENGL_API, EGL_OPENGL_ES_API, or EGL_OPENVG_API... If api
+  * is not one of the values specified above, or if the client API
+  * specified by api is not supported by the implementation, an
+  * EGL_BAD_PARAMETER error is generated."
+  */
 EGLBoolean EGLAPIENTRY
 eglBindAPI(EGLenum api)
 {